db_conn_sqlite_new.rs 76.5 KB
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *                                                                             *
 *        WARNING                                                              *
 *                                                                             *
 * This file is auto generated by ./generate_connectors.sh                     *
 *                                                                             *
 * Do not edit this file directly. Instead edit one of the corresponding       *
 * .header.rs oder .base.rs files.                                             *
 *                                                                             *
 *                                                                             *
 *                                                                             *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

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/*  medal                                                                                                            *\
 *  Copyright (C) 2020  Bundesweite Informatikwettbewerbe                                                            *
 *                                                                                                                   *
 *  This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero        *
 *  General Public License as published  by the Free Software Foundation, either version 3 of the License, or (at    *
 *  your option) any later version.                                                                                  *
 *                                                                                                                   *
 *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the       *
 *  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public      *
 *  License for more details.                                                                                        *
 *                                                                                                                   *
 *  You should have received a copy of the GNU Affero General Public License along with this program.  If not, see   *
\*  <http://www.gnu.org/licenses/>.                                                                                  */

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#![cfg(feature = "rusqlite")]
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extern crate rusqlite;

use rusqlite::Connection;
use time;
use time::Duration;

use db_conn::{MedalConnection, MedalObject};
use db_objects::*;
use helpers;

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fn gen_tosql_vector() -> Vec<&'static dyn rusqlite::types::ToSql> { Vec::new() }

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trait Queryable {
    fn query_map_one<T, F>(&self, sql: &str, params: &[&dyn rusqlite::types::ToSql], f: F)
                           -> rusqlite::Result<Option<T>>
        where F: FnOnce(&rusqlite::Row) -> T;
    fn query_map_many<T, F>(&self, sql: &str, params: &[&dyn rusqlite::types::ToSql], f: F) -> rusqlite::Result<Vec<T>>
        where F: FnMut(&rusqlite::Row) -> T;
    fn exists(&self, sql: &str, params: &[&dyn rusqlite::types::ToSql]) -> bool;
    fn get_last_id(&self) -> Option<i32>;
}

impl Queryable for Connection {
    fn query_map_one<T, F>(&self, sql: &str, params: &[&dyn rusqlite::types::ToSql], f: F)
                           -> rusqlite::Result<Option<T>>
        where F: FnOnce(&rusqlite::Row) -> T {
        let mut stmt = self.prepare(sql)?;
        let mut rows = stmt.query(params)?;
        match rows.next() {
            None => Ok(None),
            Some(Err(e)) => Err(e),
            Some(Ok(row)) => Ok(Some(f(&row))),
        }
    }

    fn query_map_many<T, F>(&self, sql: &str, params: &[&dyn rusqlite::types::ToSql], f: F) -> rusqlite::Result<Vec<T>>
        where F: FnMut(&rusqlite::Row) -> T {
        let mut stmt = self.prepare(sql)?;
        let rows = stmt.query_map(params, f)?;
        Ok(rows.map(|x| x.unwrap()).collect())
    }

    fn exists(&self, sql: &str, params: &[&dyn rusqlite::types::ToSql]) -> bool {
        let mut stmt = self.prepare(sql).unwrap();
        stmt.exists(params).unwrap()
    }

    fn get_last_id(&self) -> Option<i32> { self.query_row("SELECT last_insert_rowid()", &[], |row| row.get(0)).ok() }
}

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impl MedalObject<Connection> for Submission {
    fn save(&mut self, conn: &Connection) {
        match self.get_id() {
            Some(_id) => unimplemented!(),
            None => {
                let query = "INSERT INTO submission (task, session, grade, validated, nonvalidated_grade,
                                                     subtask_identifier, value, date, needs_validation)
                             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9)";
                conn.execute(query,
                             &[&self.task,
                               &self.session_user,
                               &self.grade,
                               &self.validated,
                               &self.nonvalidated_grade,
                               &self.subtask_identifier,
                               &self.value,
                               &self.date,
                               &self.needs_validation])
                    .unwrap();
                self.set_id(conn.get_last_id().unwrap());
            }
        }
    }
}

impl MedalObject<Connection> for Grade {
    fn save(&mut self, conn: &Connection) {
        let query = "INSERT OR REPLACE INTO grade (taskgroup, session, grade, validated)
                     VALUES (?1, ?2, ?3, ?4)";
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        conn.execute(query, &[&self.taskgroup, &self.user, &self.grade, &self.validated]).unwrap();
    }
}
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/*  medal                                                                                                            *\
 *  Copyright (C) 2020  Bundesweite Informatikwettbewerbe                                                            *
 *                                                                                                                   *
 *  This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero        *
 *  General Public License as published  by the Free Software Foundation, either version 3 of the License, or (at    *
 *  your option) any later version.                                                                                  *
 *                                                                                                                   *
 *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the       *
 *  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public      *
 *  License for more details.                                                                                        *
 *                                                                                                                   *
 *  You should have received a copy of the GNU Affero General Public License along with this program.  If not, see   *
\*  <http://www.gnu.org/licenses/>.                                                                                  */

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impl MedalObject<Connection> for Participation {
    fn save(&mut self, conn: &Connection) {
        let query = "INSERT INTO participation (contest, session, start_date)
                     VALUES (?1, ?2, ?3)";
        conn.execute(query, &[&self.contest, &self.user, &self.start]).unwrap();
    }
}

impl MedalObject<Connection> for Group {
    fn save(&mut self, conn: &Connection) {
        match self.get_id() {
            Some(_id) => unimplemented!(),
            None => {
                let query = "INSERT INTO usergroup (name, groupcode, tag, admin)
                             VALUES (?1, ?2, ?3, ?4)";
                conn.execute(query, &[&self.name, &self.groupcode, &self.tag, &self.admin]).unwrap();
                self.set_id(conn.get_last_id().unwrap());
            }
        }
    }
}

impl MedalObject<Connection> for Task {
    fn save(&mut self, conn: &Connection) {
        let query = "SELECT id
                     FROM task
                     WHERE taskgroup = ?1
                     AND location = ?2";
        conn.query_map_one(query, &[&self.taskgroup, &self.location], |row| row.get(0))
            .unwrap_or(None)
            .and_then(|id| {
                self.set_id(id);
                Some(())
            })
            .unwrap_or(()); // Err means no entry yet and is expected result

        let id = match self.get_id() {
            Some(id) => {
                let query = "UPDATE task
                             SET taskgroup = ?1, location = ?2, stars = ?3
                             WHERE id = ?4";
                conn.execute(query, &[&self.taskgroup, &self.location, &self.stars, &id]).unwrap();
                id
            }
            None => {
                let query = "INSERT INTO task (taskgroup, location, stars)
                             VALUES (?1, ?2, ?3)";
                conn.execute(query, &[&self.taskgroup, &self.location, &self.stars]).unwrap();
                conn.get_last_id().unwrap()
            }
        };
        self.set_id(id);
    }
}

impl MedalObject<Connection> for Taskgroup {
    fn save(&mut self, conn: &Connection) {
        if let Some(first_task) = self.tasks.get(0) {
            let query = "SELECT taskgroup.id
                         FROM taskgroup
                         JOIN task
                         ON task.taskgroup = taskgroup.id
                         WHERE contest = ?1
                         AND task.location = ?2";
            conn.query_map_one(query, &[&self.contest, &first_task.location], |row| row.get(0))
                .unwrap_or(None)
                .and_then(|id| {
                    self.set_id(id);
                    Some(())
                })
                .unwrap_or(()); // Err means no entry yet and is expected result
        }

        let id = match self.get_id() {
            Some(id) => {
                let query = "UPDATE taskgroup
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                             SET contest = ?1, name = ?2, active = ?3, positionalnumber = ?4
                             WHERE id = ?5";
                conn.execute(query, &[&self.contest, &self.name, &self.active, &self.positionalnumber, &id]).unwrap();
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                id
            }
            None => {
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                let query = "INSERT INTO taskgroup (contest, name, active, positionalnumber)
                             VALUES (?1, ?2, ?3, ?4)";
                conn.execute(query, &[&self.contest, &self.name, &self.active, &self.positionalnumber]).unwrap();
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                conn.get_last_id().unwrap()
            }
        };
        self.set_id(id);
        for mut task in &mut self.tasks {
            task.taskgroup = id;
            task.save(conn);
        }
    }
}

impl MedalObject<Connection> for Contest {
    fn save(&mut self, conn: &Connection) {
        let query = "SELECT id
                     FROM contest
                     WHERE location = ?1
                     AND filename = ?2";
        conn.query_map_one(query, &[&self.location, &self.filename], |row| row.get(0))
            .unwrap_or(None)
            .and_then(|id| {
                self.set_id(id);
                Some(())
            })
            .unwrap_or(()); // Err means no entry yet and is expected result

        let id = match self.get_id() {
            Some(id) => {
                let query = "UPDATE contest
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                             SET location = ?2,filename = ?3, name = ?4, duration = ?5, public = ?6, start_date = ?7,
                                 end_date = ?8, min_grade = ?9, max_grade = ?10, positionalnumber = ?11,
                                 requires_login = ?12, secret = ?13
                             WHERE id = ?1";
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                conn.execute(query,
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                             &[&id,
                               &self.location,
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                               &self.filename,
                               &self.name,
                               &self.duration,
                               &self.public,
                               &self.start,
                               &self.end,
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                               &self.min_grade,
                               &self.max_grade,
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                               &self.positionalnumber,
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                               &self.requires_login,
                               &self.secret])
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                    .unwrap();
                id
            }
            None => {
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                let query = "INSERT INTO contest (location, filename, name, duration, public, start_date, end_date,
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                                                  min_grade, max_grade, positionalnumber, requires_login, secret)
                             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10, ?11, ?12)";
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                conn.execute(query,
                             &[&self.location,
                               &self.filename,
                               &self.name,
                               &self.duration,
                               &self.public,
                               &self.start,
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                               &self.end,
                               &self.min_grade,
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                               &self.max_grade,
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                               &self.positionalnumber,
                               &self.requires_login,
                               &self.secret])
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                    .unwrap();
                conn.get_last_id().unwrap()
            }
        };
        self.set_id(id);
        for mut taskgroup in &mut self.taskgroups {
            taskgroup.contest = id;
            taskgroup.save(conn);
        }
    }
}

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impl MedalConnection for Connection {
    fn dbtype(&self) -> &'static str { "sqlite_v2" }

    fn migration_already_applied(&self, name: &str) -> bool {
        let create_string = "CREATE TABLE IF NOT EXISTS migrations (name TEXT PRIMARY KEY);";
        self.execute(create_string, &[]).unwrap();

        let query = "SELECT name FROM migrations WHERE name = ?1";
        self.exists(query, &[&name])
    }

    fn apply_migration(&mut self, name: &str, contents: &str) {
        print!("Applying migration `{}` … ", name);

        let tx = self.transaction().unwrap();

        tx.execute_batch(&contents).unwrap();
        tx.execute("INSERT INTO migrations (name) VALUES (?1)", &[&name]).unwrap();

        tx.commit().unwrap();

        println!("OK.");
    }

    // fn get_session<T: ToSql>(&self, key: T, keyname: &str) -> Option<SessionUser> {
    fn get_session(&self, key: &str) -> Option<SessionUser> {
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        let query = "SELECT id, csrf_token, last_login, last_activity, permanent_login, username, password, salt,
                            logincode, email, email_unconfirmed, email_confirmationcode, firstname, lastname, street,
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                            zip, city, nation, grade, sex, is_admin, is_teacher, managed_by, oauth_provider, oauth_foreign_id
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                     FROM session
                     WHERE session_token = ?1";
        let session = self.query_map_one(query, &[&key], |row| SessionUser { id: row.get(0),
                                                                             session_token: Some(key.to_string()),
                                                                             csrf_token: row.get(1),
                                                                             last_login: row.get(2),
                                                                             last_activity: row.get(3),
                                                                             permanent_login: row.get(4),

                                                                             username: row.get(5),
                                                                             password: row.get(6),
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                                                                             salt: row.get(7),
                                                                             logincode: row.get(8),
                                                                             email: row.get(9),
                                                                             email_unconfirmed: row.get(10),
                                                                             email_confirmationcode: row.get(11),

                                                                             firstname: row.get(12),
                                                                             lastname: row.get(13),
                                                                             street: row.get(14),
                                                                             zip: row.get(15),
                                                                             city: row.get(16),
                                                                             nation: row.get(17),
                                                                             grade: row.get(18),
                                                                             sex: row.get(19),

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                                                                             is_admin: row.get(20),
                                                                             is_teacher: row.get(21),
                                                                             managed_by: row.get(22),
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                                                                             oauth_provider: row.get(23),
                                                                             oauth_foreign_id: row.get(24) })
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                          .ok()??;

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        let duration = Duration::hours(12);
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        let now = time::get_time();

        if let Some(last_activity) = session.last_activity {
            if now - last_activity < duration {
                let query = "UPDATE session
                             SET last_activity = ?1
                             WHERE id = ?2";
                self.execute(query, &[&now, &session.id]).unwrap();
                return Some(session);
            } else {
                // Session timed out
                // Should remove session token from session
                return None;
            }
        }
        // last_activity undefined
        // TODO: What should happen here?
        None
    }
    fn save_session(&self, session: SessionUser) {
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        self.execute("UPDATE session
                      SET username = ?1,
                          password = ?2,
                          salt = ?3,
                          logincode = ?4,
                          firstname = ?5,
                          lastname = ?6,
                          street = ?7,
                          zip = ?8,
                          city = ?9,
                          grade = ?10,
                          sex = ?11,
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                          is_admin = ?12,
                          is_teacher = ?13,
                          permanent_login = ?14
                      WHERE id = ?15",
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                     &[&session.username,
                       &session.password,
                       &session.salt,
                       &session.logincode,
                       &session.firstname,
                       &session.lastname,
                       &session.street,
                       &session.zip,
                       &session.city,
                       &session.grade,
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                       &session.sex,
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                       &session.is_admin,
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                       &session.is_teacher,
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                       &session.permanent_login,
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                       &session.id])
            .unwrap();
    }
    fn new_session(&self, session_token: &str) -> SessionUser {
        let csrf_token = helpers::make_csrf_token();

        let now = time::get_time();
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        let query = "INSERT INTO session (session_token, csrf_token, last_activity, permanent_login, grade, sex,
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                                          is_teacher)
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                     VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7)";
        self.execute(query, &[&session_token, &csrf_token, &now, &false, &0, &None::<i32>, &false]).unwrap();
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        let id = self.get_last_id().expect("Expected to get last row id");

        SessionUser::minimal(id, session_token.to_owned(), csrf_token)
    }
    fn get_session_or_new(&self, key: &str) -> SessionUser {
        let query = "UPDATE session
                     SET session_token = ?1
                     WHERE session_token = ?2";
        self.get_session(&key).ensure_alive().unwrap_or_else(|| {
                                                 // TODO: Factor this out in own function
                                                 // TODO: Should a new session key be generated every time?
                                                 self.execute(query, &[&Option::<String>::None, &key]).unwrap();
                                                 self.new_session(&key)
                                             })
    }

    fn get_user_by_id(&self, user_id: i32) -> Option<SessionUser> {
        let query = "SELECT session_token, csrf_token, last_login, last_activity, permanent_login, username, password,
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                            salt, logincode, email, email_unconfirmed, email_confirmationcode, firstname, lastname,
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                            street, zip, city, nation, grade, sex, is_admin, is_teacher, managed_by, oauth_provider,
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                            oauth_foreign_id
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                     FROM session
                     WHERE id = ?1";
        self.query_map_one(query, &[&user_id], |row| SessionUser { id: user_id,
                                                                   session_token: row.get(0),
                                                                   csrf_token: row.get(1),
                                                                   last_login: row.get(2),
                                                                   last_activity: row.get(3),
                                                                   permanent_login: row.get(4),

                                                                   username: row.get(5),
                                                                   password: row.get(6),
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                                                                   salt: row.get(7),
                                                                   logincode: row.get(8),
                                                                   email: row.get(9),
                                                                   email_unconfirmed: row.get(10),
                                                                   email_confirmationcode: row.get(11),

                                                                   firstname: row.get(12),
                                                                   lastname: row.get(13),
                                                                   street: row.get(14),
                                                                   zip: row.get(15),
                                                                   city: row.get(16),
                                                                   nation: row.get(17),
                                                                   grade: row.get(18),
                                                                   sex: row.get(19),

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                                                                   is_admin: row.get(20),
                                                                   is_teacher: row.get(21),
                                                                   managed_by: row.get(22),
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                                                                   oauth_provider: row.get(23),
                                                                   oauth_foreign_id: row.get(24) })
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            .ok()?
    }

    fn get_user_and_group_by_id(&self, user_id: i32) -> Option<(SessionUser, Option<Group>)> {
        let session = self.get_user_by_id(user_id)?;

        let group_id = match session.managed_by {
            Some(id) => id,
            None => return Some((session, None)),
        };

        let query = "SELECT name, groupcode, tag, admin
                     FROM usergroup
                     WHERE id = ?1";
        let res = self.query_map_one(query, &[&group_id], |row| Group { id: Some(group_id),
                                                                        name: row.get(0),
                                                                        groupcode: row.get(1),
                                                                        tag: row.get(2),
                                                                        admin: row.get(3),
                                                                        members: Vec::new() })
                      .ok()?;
        match res {
            Some(group) => Some((session, Some(group))),
            _ => Some((session, None)),
        }
    }

    //TODO: use session
    fn login(&self, _session: Option<&str>, username: &str, password: &str) -> Result<String, ()> {
        let query = "SELECT id, password, salt
                     FROM session
                     WHERE username = ?1";
        self.query_map_one(query, &[&username], |row| {
                let (id, password_hash, salt): (i32, Option<String>, Option<String>) =
                    (row.get(0), row.get(1), row.get(2));

                //password_hash ist das, was in der Datenbank steht
                if helpers::verify_password(&password,
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                                            &salt.ok_or_else(|| println!("salt from database empty"))?,
                                            &password_hash.ok_or_else(|| println!("password from database empty"))?)
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                {
                    // TODO: fail more pleasantly
                    // Login okay, update session now!

                    let session_token = helpers::make_session_token();
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                    let csrf_token = helpers::make_csrf_token();
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                    let now = time::get_time();

                    let query = "UPDATE session
                                 SET session_token = ?1, csrf_token = ?2, last_login = ?3, last_activity = ?3
                                 WHERE id = ?4";
                    self.execute(query, &[&session_token, &csrf_token, &now, &id]).unwrap();

                    Ok(session_token)
                } else {
                    Err(())
                }
            })
            .map_err(|_| ())?
            .ok_or(())?
    }

    //TODO: use session
    fn login_with_code(&self, _session: Option<&str>, logincode: &str) -> Result<String, ()> {
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        let query = "SELECT id
                     FROM session
                     WHERE logincode = ?1";
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        self.query_map_one(query, &[&logincode], |row| {
                // Login okay, update session now!
                let id: i32 = row.get(0);

                let session_token = helpers::make_session_token();
                let csrf_token = helpers::make_csrf_token();
                let now = time::get_time();

                let query = "UPDATE session
                             SET session_token = ?1, csrf_token = ?2, last_login = ?3, last_activity = ?3
                             WHERE id = ?4";
                self.execute(query, &[&session_token, &csrf_token, &now, &id]).unwrap();

                session_token
            })
            .map_err(|_| ())?
            .ok_or(())
    }

    //TODO: use session
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    fn login_foreign(&self, _session: Option<&str>, provider_id: &str, foreign_id: &str,
                     (is_teacher, is_admin, firstname, lastname, sex): (bool, bool, &str, &str, Option<i32>))
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                     -> Result<(String, Option<time::Timespec>), ()>
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    {
        let session_token = helpers::make_session_token();
        let csrf_token = helpers::make_csrf_token();
        let now = time::get_time();

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        let query = "SELECT id, last_activity
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                     FROM session
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                     WHERE oauth_foreign_id = ?1
                           AND oauth_provider = ?2";
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        match self.query_map_one(query, &[&foreign_id, &provider_id], |row| -> (i32, time::Timespec) {
                      (row.get(0), row.get(1))
                  }) {
            Ok(Some((id, last_activity))) => {
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                let query = "UPDATE session
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                             SET session_token = ?1, csrf_token = ?2, last_login = ?3, last_activity = ?3,
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                                 is_teacher = ?4, is_admin = ?5,  firstname = ?6, lastname = ?7, sex = ?8
                             WHERE id = ?9";
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                self.execute(query,
                             &[&session_token,
                               &csrf_token,
                               &now,
                               &is_teacher,
                               &is_admin,
                               &firstname,
                               &lastname,
                               &sex,
                               &id])
                    .unwrap();
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                Ok((session_token, Some(last_activity)))
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            }
            // Add!
            _ => {
                let query = "INSERT INTO session (session_token, csrf_token, last_login, last_activity,
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                                                  permanent_login, grade, sex, is_teacher, is_admin, oauth_foreign_id,
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                                                  oauth_provider, firstname, lastname)
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                             VALUES (?1, ?2, ?3, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10, ?11, ?12)";
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                self.execute(query,
                             &[&session_token,
                               &csrf_token,
                               &now,
                               &false,
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                               &(if is_teacher { 255 } else { 0 }),
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                               &sex,
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                               &is_teacher,
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                               &is_admin,
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                               &foreign_id,
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                               &provider_id,
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                               &firstname,
                               &lastname])
                    .unwrap();

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                Ok((session_token, None))
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            }
        }
    }

    //TODO: use session
    fn create_user_with_groupcode(&self, _session: Option<&str>, groupcode: &str) -> Result<String, ()> {
        let query = "SELECT id
                     FROM usergroup
                     WHERE groupcode = ?1";
        let group_id =
            self.query_map_one(query, &[&groupcode], |row| -> i32 { row.get(0) }).map_err(|_| ())?.ok_or(())?;

        // Login okay, create session!
        let session_token = helpers::make_session_token();
        let csrf_token = helpers::make_csrf_token();
        let login_code = helpers::make_login_code(); // TODO: check for collisions
        let now = time::get_time();

        let query = "INSERT INTO session (session_token, csrf_token, last_login, last_activity, permanent_login,
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                                          logincode, grade, sex, is_teacher, managed_by)
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                     VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10)";
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        self.execute(query,
                     &[&session_token,
                       &csrf_token,
                       &now,
                       &now,
                       &false,
                       &login_code,
                       &0,
                       &None::<i32>,
                       &false,
                       &group_id])
            .unwrap();
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        Ok(session_token)
    }

    fn create_group_with_users(&self, mut group: Group) {
        // Generate group ID:
        group.save(self);

        for user in group.members {
            let csrf_token = helpers::make_csrf_token();
            let login_code = helpers::make_login_code(); // TODO: check for collisions

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            let query = "INSERT INTO session (firstname, lastname, csrf_token, permanent_login, logincode, grade, sex,
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                                              is_teacher, managed_by)
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                         VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9)";
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            self.execute(query,
                         &[&user.firstname,
                           &user.lastname,
                           &csrf_token,
                           &false,
                           &login_code,
                           &user.grade,
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                           &None::<i32>,
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                           &false,
                           &group.id])
                .unwrap();
        }
    }

    fn logout(&self, session: &str) {
        let query = "UPDATE session
                     SET session_token = NULL
                     WHERE session_token = ?1";
        self.execute(query, &[&session]).unwrap();
    }

    fn load_submission(&self, session: &SessionUser, task: i32, subtask: Option<&str>) -> Option<Submission> {
        match subtask {
            None => {
                let query = "SELECT id, grade, validated, nonvalidated_grade, value, date, needs_validation
                             FROM submission
                             WHERE task = ?1
                             AND session = ?2
                             ORDER BY id DESC
                             LIMIT 1";
                self.query_map_one(query, &[&task, &session.id], |row| Submission { id: Some(row.get(0)),
                                                                                    task: task,
                                                                                    session_user: session.id,
                                                                                    grade: row.get(1),
                                                                                    validated: row.get(2),
                                                                                    nonvalidated_grade: row.get(3),
                                                                                    subtask_identifier: None,
                                                                                    value: row.get(4),
                                                                                    date: row.get(5),
                                                                                    needs_validation: row.get(6) })
                    .ok()?
            }
            Some(subtask_id) => {
                let query = "SELECT id, grade, validated, nonvalidated_grade, value, date, needs_validation
                             FROM submission
                             WHERE task = ?1
                             AND session = ?2
                             AND subtask_identifier = ?3
                             ORDER BY id DESC
                             LIMIT 1";
                self.query_map_one(query, &[&task, &session.id, &subtask_id], |row| {
                        Submission { id: Some(row.get(0)),
                                     task: task,
                                     session_user: session.id,
                                     grade: row.get(1),
                                     validated: row.get(2),
                                     nonvalidated_grade: row.get(3),
                                     subtask_identifier: Some(subtask_id.to_string()),
                                     value: row.get(4),
                                     date: row.get(5),
                                     needs_validation: row.get(6) }
                    })
                    .ok()?
            }
        }
    }
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    fn get_all_submissions(&self, session_id: i32, task: i32, subtask: Option<&str>) -> Vec<Submission> {
        match subtask {
            None => {
                let query = "SELECT id, grade, validated, nonvalidated_grade, value, date, needs_validation
                             FROM submission
                             WHERE task = ?1
                             AND session = ?2";
                self.query_map_many(query, &[&task, &session_id], |row| Submission { id: Some(row.get(0)),
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                                                                                     task: task,
                                                                                     session_user: session_id,
                                                                                     grade: row.get(1),
                                                                                     validated: row.get(2),
                                                                                     nonvalidated_grade: row.get(3),
                                                                                     subtask_identifier: None,
                                                                                     value: row.get(4),
                                                                                     date: row.get(5),
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                                                                                     needs_validation: row.get(6) })
                    .unwrap()
            }
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            _ => unimplemented!(),
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        }
    }
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    fn submit_submission(&self, mut submission: Submission) {
        submission.save(self);

        let mut grade = self.get_grade_by_submission(submission.id.unwrap());
        if grade.grade.is_none() || submission.grade > grade.grade.unwrap() {
            grade.grade = Some(submission.grade);
            grade.validated = false;
            grade.save(self);
        }
    }
    fn get_grade_by_submission(&self, submission_id: i32) -> Grade {
        let query = "SELECT grade.taskgroup, grade.session, grade.grade, grade.validated
                     FROM grade
                     JOIN task ON grade.taskgroup = task.taskgroup
                     JOIN submission ON task.id = submission.task
                     AND grade.session = submission.session
                     WHERE submission.id = ?1";
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        self.query_map_one(query, &[&submission_id], |row| Grade { taskgroup: row.get(0),
                                                                   user: row.get(1),
                                                                   grade: row.get(2),
                                                                   validated: row.get(3) })
            .unwrap_or(None)
            .unwrap_or_else(|| {
                let query = "SELECT task.taskgroup, submission.session
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                         FROM submission
                         JOIN task ON task.id = submission.task
                         WHERE submission.id = ?1";
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                self.query_map_one(query, &[&submission_id], |row| Grade { taskgroup: row.get(0),
                                                                           user: row.get(1),
                                                                           grade: None,
                                                                           validated: false })
                    .unwrap()
                    .unwrap() // should this unwrap?
            })
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    }

    fn get_contest_groups_grades(&self, session_id: i32, contest_id: i32)
                                 -> (Vec<String>, Vec<(Group, Vec<(UserInfo, Vec<Grade>)>)>) {
        let query = "SELECT id, name
                     FROM taskgroup
                     WHERE contest = ?1
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                     AND active = ?2
                     ORDER BY positionalnumber";
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        let tasknames: Vec<(i32, String)> =
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            self.query_map_many(query, &[&contest_id, &true], |row| (row.get(0), row.get(1))).unwrap();
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        let mut taskindex: ::std::collections::BTreeMap<i32, usize> = ::std::collections::BTreeMap::new();

        let n_tasks = tasknames.len();
        for (index, (i, _)) in tasknames.iter().enumerate() {
            taskindex.insert(*i, index);
        }

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        let query = "SELECT grade.taskgroup, grade.session, grade.grade, grade.validated, usergroup.id, usergroup.name,
                            usergroup.groupcode, usergroup.tag, student.id, student.username, student.logincode,
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                            student.firstname, student.lastname, student.grade AS sgrade
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                     FROM grade
                     JOIN taskgroup ON grade.taskgroup = taskgroup.id
                     JOIN session AS student ON grade.session = student.id
                     JOIN usergroup ON student.managed_by = usergroup.id
                     WHERE usergroup.admin = ?1
                     AND taskgroup.contest = ?2
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                     AND taskgroup.active = ?3
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                     ORDER BY usergroup.id, sgrade, student.lastname, student.firstname, student.id,
                              taskgroup.positionalnumber";
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        let gradeinfo =
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            self.query_map_many(query, &[&session_id, &contest_id, &true], |row| {
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                    (Grade { taskgroup: row.get(0), user: row.get(1), grade: row.get(2), validated: row.get(3) },
                     Group { id: Some(row.get(4)),
                             name: row.get(5),
                             groupcode: row.get(6),
                             tag: row.get(7),
                             admin: session_id,
                             members: Vec::new() },
                     UserInfo { id: row.get(8),
                                username: row.get(9),
                                logincode: row.get(10),
                                firstname: row.get(11),
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                                lastname: row.get(12),
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                                grade: row.get(13) })
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                })
                .unwrap();
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        let mut gradeinfo_iter = gradeinfo.iter();
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        if let Some(t /*Ok((grade, mut group, mut userinfo))*/) = gradeinfo_iter.next() {
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            let (grade, mut group, mut userinfo) = t.clone();
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            let mut grades: Vec<Grade> = vec![Default::default(); n_tasks];
            let mut users: Vec<(UserInfo, Vec<Grade>)> = Vec::new();
            let mut groups: Vec<(Group, Vec<(UserInfo, Vec<Grade>)>)> = Vec::new();

            let index = grade.taskgroup;
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            grades[taskindex[&index]] = grade;
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            for ggu in gradeinfo_iter {
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                let (g, gr, ui) = ggu;
                if gr.id != group.id {
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                    users.push((userinfo, grades));
                    userinfo = ui.clone();
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                    grades = vec![Default::default(); n_tasks];

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                    groups.push((group, users));
                    group = gr.clone();
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                    users = Vec::new();
                } else if ui.id != userinfo.id {
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                    users.push((userinfo, grades));
                    userinfo = ui.clone();
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                    grades = vec![Default::default(); n_tasks];
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                }
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                let index = g.taskgroup;
                grades[taskindex[&index]] = *g;
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            }
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            users.push((userinfo, grades));
            groups.push((group, users));
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            (tasknames.iter().map(|(_, name)| name.clone()).collect(), groups)
        } else {
            (Vec::new(), Vec::new()) // should those be default filled?
        }
    }
    fn get_contest_user_grades(&self, session_token: &str, contest_id: i32) -> Vec<Grade> {
        let query = "SELECT id, name
                     FROM taskgroup
                     WHERE contest = ?1
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                     AND active = ?2
                     ORDER BY positionalnumber";
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        let tasknames: Vec<(i32, String)> =
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            self.query_map_many(query, &[&contest_id, &true], |row| (row.get(0), row.get(1))).unwrap();
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        let mut taskindex: ::std::collections::BTreeMap<i32, usize> = ::std::collections::BTreeMap::new();

        let n_tasks = tasknames.len();
        for (index, (i, _)) in tasknames.iter().enumerate() {
            taskindex.insert(*i, index);
        }

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        let query = "SELECT grade.taskgroup, grade.session, grade.grade, grade.validated
                     FROM grade
                     JOIN taskgroup ON grade.taskgroup = taskgroup.id
                     JOIN session ON session.id = grade.session
                     WHERE session.session_token = ?1
                     AND taskgroup.contest = ?2
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                     AND taskgroup.active = ?3
                     ORDER BY taskgroup.positionalnumber";
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        let gradeinfo =
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            self.query_map_many(query, &[&session_token, &contest_id, &true], |row| Grade { taskgroup: row.get(0),
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                                                                                            user: row.get(1),
                                                                                            grade: row.get(2),
                                                                                            validated: row.get(3) })
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                .unwrap();
        let gradeinfo_iter = gradeinfo.iter();
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        let mut grades: Vec<Grade> = vec![Default::default(); n_tasks];

        for g in gradeinfo_iter {
            let index = g.taskgroup;
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            grades[taskindex[&index]] = *g;
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        }

        grades
    }

    fn get_taskgroup_user_grade(&self, session_token: &str, taskgroup_id: i32) -> Grade {
        let query = "SELECT grade.taskgroup, grade.session, grade.grade, grade.validated
                     FROM grade
                     JOIN session ON session.id = grade.session
                     WHERE session.session_token = ?1
                     AND grade.taskgroup = ?2";
        self.query_map_one(query, &[&session_token, &taskgroup_id], |row| Grade { taskgroup: row.get(0),
                                                                                  user: row.get(1),
                                                                                  grade: row.get(2),
                                                                                  validated: row.get(3) })
            .unwrap_or(None)
            .unwrap_or_default()
    }

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    /* Warning: This function makes no use of rusts type safety. Handle with care when changeing */
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    fn export_contest_results_to_file(&self, contest_id: i32, taskgroups: &[(i32, String)], filename: &str) {
        use std::fs::OpenOptions;
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        let file = OpenOptions::new().write(true).create(true).truncate(true).open(filename).unwrap();
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        let mut headers = vec!["id",
                               "username",
                               "logincode",
                               "oauth_foreign_id",
                               "oauth_provider",
                               "firstname",
                               "lastname",
                               "grade",
                               "sex",
                               "is_teacher",
                               "group_id",
                               "group_name",
                               "group_tag",
                               "teacher_id",
                               "teacher_firstname",
                               "teacher_lastname",
                               "teacher_oauth_foreign_id",
                               "teacher_oauth_provider",
                               "contest_id",
                               "start_date"];
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        let mut select_part = String::new();
        let mut join_part = String::new();
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        let mut join_params = gen_tosql_vector();

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        join_params.push(&contest_id);
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        for (n, (id, name)) in taskgroups.iter().enumerate() {
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            select_part.push_str(&format!(",\n g{}.grade ", n));
            join_part.push_str(&format!("\n LEFT JOIN grade AS g{} ON session.id = g{}.session AND g{}.taskgroup = ?{} ", n, n, n, n + 2));
            join_params.push(id);
            headers.push(&name);
        }
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        let query = format!("SELECT session.id,
                                    session.username,
                                    session.logincode,
                                    session.oauth_foreign_id,
                                    session.oauth_provider,
                                    session.firstname,
                                    session.lastname,
                                    session.grade,
                                    session.sex,
                                    session.is_teacher,
                                    session.managed_by,
                                    usergroup.name,
                                    usergroup.tag,
                                    teacher.id,
                                    teacher.firstname,
                                    teacher.lastname,
                                    teacher.oauth_foreign_id,
                                    teacher.oauth_provider,
                                    participation.contest,
                                    participation.start_date
                                    {}
                             FROM participation
                             JOIN session ON participation.session = session.id
                             {}
                             LEFT JOIN usergroup ON session.managed_by = usergroup.id
                             LEFT JOIN session AS teacher ON usergroup.admin = teacher.id
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                             WHERE participation.contest = ?1",
                            select_part, join_part);
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        use csv::Writer;
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        let mut wtr = Writer::from_writer(file);
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        wtr.serialize(&headers).unwrap();
        wtr.flush().unwrap();
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        let file = wtr.into_inner().unwrap();
        let mut wtr = Writer::from_writer(file);
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        self.query_map_many(&query, join_params.as_slice(), |row| {
                let mut points = Vec::new();
                for i in 20..20 + taskgroups.len() {
                    points.push(row.get::<_, Option<i32>>(i));
                }
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                // Serialized as several tuples because Serde only supports tuples up to a certain length
                // (16 according to https://docs.serde.rs/serde/trait.Deserialize.html)
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                wtr.serialize(((row.get::<_, i32>(0),
                                row.get::<_, Option<String>>(1),
                                row.get::<_, Option<String>>(2),
                                row.get::<_, Option<String>>(3),
                                row.get::<_, Option<String>>(4),
                                row.get::<_, Option<String>>(5),
                                row.get::<_, Option<String>>(6),
                                row.get::<_, i32>(7),
                                row.get::<_, Option<i32>>(8),
                                row.get::<_, bool>(9)),
                               (row.get::<_, Option<i32>>(10),
                                row.get::<_, Option<String>>(11),
                                row.get::<_, Option<String>>(12),
                                row.get::<_, Option<i32>>(13),
                                row.get::<_, Option<String>>(14),
                                row.get::<_, Option<String>>(15),
                                row.get::<_, Option<String>>(16),
                                row.get::<_, Option<String>>(17)),
                               row.get::<_, Option<i32>>(18),
                               row.get::<_, Option<String>>(19),
                               points))
                   .unwrap();
            })
            .unwrap();
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        wtr.flush().unwrap();
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    }

1033
    fn get_contest_list(&self) -> Vec<Contest> {
1034
        let query = "SELECT id, location, filename, name, duration, public, start_date, end_date, min_grade, max_grade,
1035
                            positionalnumber, requires_login, secret
1036
                     FROM contest
1037
                     ORDER BY positionalnumber";
1038
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        self.query_map_many(query, &[], |row| Contest { id: Some(row.get(0)),
                                                        location: row.get(1),
                                                        filename: row.get(2),
                                                        name: row.get(3),
                                                        duration: row.get(4),
                                                        public: row.get(5),
                                                        start: row.get(6),
                                                        end: row.get(7),
1046
1047
                                                        min_grade: row.get(8),
                                                        max_grade: row.get(9),
1048
                                                        positionalnumber: row.get(10),
1049
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                                                        requires_login: row.get(11),
                                                        secret: row.get(12),
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                                                        taskgroups: Vec::new() })
            .unwrap()
    }

    fn get_contest_by_id(&self, contest_id: i32) -> Contest {
1056
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        let query = "SELECT location, filename, name, duration, public, start_date, end_date, min_grade, max_grade,
                            requires_login, secret
1058
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                     FROM contest
                     WHERE id = ?1";
        self.query_map_one(query, &[&contest_id], |row| Contest { id: Some(contest_id),
                                                                  location: row.get(0),
                                                                  filename: row.get(1),
                                                                  name: row.get(2),
                                                                  duration: row.get(3),
                                                                  public: row.get(4),
                                                                  start: row.get(5),
                                                                  end: row.get(6),
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                                                                  min_grade: row.get(7),
                                                                  max_grade: row.get(8),
1070
                                                                  positionalnumber: None,
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                                                                  requires_login: row.get(9),
                                                                  secret: row.get(10),
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                                                                  taskgroups: Vec::new() })
            .unwrap()
            .unwrap() // TODO: Should return Option?
    }

    fn get_contest_by_id_complete(&self, contest_id: i32) -> Contest {
        let query = "SELECT contest.location, contest.filename, contest.name, contest.duration, contest.public,
1080
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                            contest.start_date, contest.end_date, contest.min_grade, contest.max_grade,
                            contest.requires_login, contest.secret, taskgroup.id, taskgroup.name, task.id,
                            task.location, task.stars
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                     FROM contest
                     JOIN taskgroup ON contest.id = taskgroup.contest
                     JOIN task ON taskgroup.id = task.taskgroup
1086
                     WHERE contest.id = ?1
1087
                     AND taskgroup.active = ?2
1088
                     ORDER BY taskgroup.positionalnumber";
1089
        let taskgroupcontest =
1090
            self.query_map_many(query, &[&contest_id, &true], |row| {
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                    (Contest { id: Some(contest_id),
                               location: row.get(0),
                               filename: row.get(1),
                               name: row.get(2),
                               duration: row.get(3),
                               public: row.get(4),
                               start: row.get(5),
                               end: row.get(6),
1099
1100
                               min_grade: row.get(7),
                               max_grade: row.get(8),
1101
                               positionalnumber: None,
1102
1103
                               requires_login: row.get(9),
                               secret: row.get(10),
1104
                               taskgroups: Vec::new() },
1105
                     Taskgroup { id: Some(row.get(11)),
1106
                                 contest: contest_id,
1107
                                 name: row.get(12),
1108
                                 active: true,
1109
1110
                                 positionalnumber: None,
                                 tasks: Vec::new() },
1111
                     Task { id: Some(row.get(13)), taskgroup: row.get(11), location: row.get(14), stars: row.get(15) })
1112
1113
                })
                .unwrap();
1114
        let mut taskgroupcontest_iter = taskgroupcontest.into_iter();
1115

1116
        let (mut contest, mut taskgroup, task) = taskgroupcontest_iter.next().unwrap();
1117
1118
        taskgroup.tasks.push(task);
        for tgc in taskgroupcontest_iter {
1119
1120
1121
1122
            let (_, tg, t) = tgc;
            if tg.id != taskgroup.id {
                contest.taskgroups.push(taskgroup);
                taskgroup = tg;
1123
            }
1124
            taskgroup.tasks.push(t);
1125
1126
1127
1128
1129
1130
1131
        }
        contest.taskgroups.push(taskgroup);
        contest
    }

    fn get_contest_by_id_partial(&self, contest_id: i32) -> Contest {
        let query = "SELECT contest.location, contest.filename, contest.name, contest.duration, contest.public,
1132
1133
                            contest.start_date, contest.end_date, contest.min_grade, contest.max_grade,
                            contest.requires_login, contest_secret, taskgroup.id, taskgroup.name
1134
1135
                     FROM contest
                     JOIN taskgroup ON contest.id = taskgroup.contest
1136
1137
1138
                     WHERE contest.id = ?1
                     AND taskgroup.active = ?2";
        let taskgroupcontest = self.query_map_many(query, &[&contest_id, &true], |row| {
1139
1140
1141
1142
1143
1144
1145
1146
                                       (Contest { id: Some(contest_id),
                                                  location: row.get(0),
                                                  filename: row.get(1),
                                                  name: row.get(2),
                                                  duration: row.get(3),
                                                  public: row.get(4),
                                                  start: row.get(5),
                                                  end: row.get(6),
1147
1148
                                                  min_grade: row.get(7),
                                                  max_grade: row.get(8),
1149
                                                  positionalnumber: None,
1150
1151
                                                  requires_login: row.get(9),
                                                  secret: row.get(10),
1152
                                                  taskgroups: Vec::new() },
1153
                                        Taskgroup { id: Some(row.get(11)),
1154
                                                    contest: contest_id,
1155
                                                    name: row.get(12),
1156
                                                    active: true,
1157
1158
1159
1160
                                                    positionalnumber: None,
                                                    tasks: Vec::new() })
                                   })
                                   .unwrap();
1161
        let mut taskgroupcontest_iter = taskgroupcontest.into_iter();
1162

1163
        let (mut contest, taskgroup) = taskgroupcontest_iter.next().unwrap();
1164
1165
        contest.taskgroups.push(taskgroup);
        for tgc in taskgroupcontest_iter {
1166
1167
            let (_, tg) = tgc;
            contest.taskgroups.push(tg);
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
        }
        contest
    }

    fn get_participation(&self, session: &str, contest_id: i32) -> Option<Participation> {
        let query = "SELECT session, start_date
                     FROM participation
                     JOIN session ON session.id = session
                     WHERE session.session_token = ?1
                     AND contest = ?2";
        self.query_map_one(query, &[&session, &contest_id], |row| Participation { contest: contest_id,
                                                                                  user: row.get(0),
                                                                                  start: row.get(1) })
            .ok()?
    }
1183
1184
1185
1186
1187
1188
1189
1190

    fn get_all_participations_complete(&self, session_id: i32) -> Vec<(Participation, Contest)> {
        let query = "SELECT participation.start_date, contest.id, location, filename, name, duration, public,
                            contest.start_date, end_date, min_grade, max_grade, requires_login, secret
                     FROM participation
                     JOIN contest ON participation.contest = contest.id
                     WHERE participation.session = ?1";
        self.query_map_many(query, &[&session_id], |row| {
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
                (Participation { contest: row.get(1), user: session_id, start: row.get(0) },
                 Contest { id: Some(row.get(1)),
                           location: row.get(2),
                           filename: row.get(3),
                           name: row.get(4),
                           duration: row.get(5),
                           public: row.get(6),
                           start: row.get(7),
                           end: row.get(8),
                           min_grade: row.get(9),
                           max_grade: row.get(10),
                           positionalnumber: None,
                           requires_login: row.get(11),
                           secret: row.get(12),
                           taskgroups: Vec::new() })
            })
            .unwrap()
1208
1209
    }

1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
    fn new_participation(&self, session: &str, contest_id: i32) -> Result<Participation, ()> {
        let query = "SELECT session, start_date
                     FROM participation
                     JOIN session ON session.id = session
                     WHERE session.session_token = ?1
                     AND contest = ?2";
        match self.query_map_one(query, &[&session, &contest_id], |_| {}).map_err(|_| ())? {
            Some(()) => Err(()),
            None => {
                let now = time::get_time();
                self.execute(
                             "INSERT INTO participation (contest, session, start_date)
                     SELECT ?1, id, ?2 FROM session WHERE session_token = ?3",
                             &[&contest_id, &now, &session],
                )
                    .unwrap();

                Ok(self.get_participation(session, contest_id).unwrap()) // TODO: This errors if not logged in …
            }
        }
    }
    fn get_task_by_id(&self, task_id: i32) -> Task {
        let query = "SELECT location, stars, taskgroup
                     FROM task
                     WHERE id = ?1";
        self.query_map_one(query, &[&task_id], |row| Task { id: Some(task_id),
                                                            taskgroup: row.get(2),
                                                            location: row.get(0),
                                                            stars: row.get(1) })
            .unwrap()
            .unwrap()
    }
    fn get_task_by_id_complete(&self, task_id: i32) -> (Task, Taskgroup, Contest) {
1243
1244
        let query = "SELECT task.location, task.stars, taskgroup.id, taskgroup.name, taskgroup.active, contest.id,
                            contest.location, contest.filename, contest.name, contest.duration, contest.public,
1245
1246
                            contest.start_date, contest.end_date, contest.min_grade, contest.max_grade,
                            contest.requires_login, contest.secret
1247
1248
1249
1250
1251
1252
                     FROM contest
                     JOIN taskgroup ON taskgroup.contest = contest.id
                     JOIN task ON task.taskgroup = taskgroup.id
                     WHERE task.id = ?1";
        self.query_map_one(query, &[&task_id], |row| {
                (Task { id: Some(task_id), taskgroup: row.get(2), location: row.get(0), stars: row.get(1) },
1253
                 Taskgroup { id: Some(row.get(2)),
1254
                             contest: row.get(5),
1255
                             name: row.get(3),
1256
                             active: row.get(4),
1257
1258
                             positionalnumber: None,
                             tasks: Vec::new() },
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
                 Contest { id: Some(row.get(5)),
                           location: row.get(6),
                           filename: row.get(7),
                           name: row.get(8),
                           duration: row.get(9),
                           public: row.get(10),
                           start: row.get(11),
                           end: row.get(12),
                           min_grade: row.get(13),
                           max_grade: row.get(14),
1269
                           positionalnumber: None,
1270
1271
                           requires_login: row.get(15),
                           secret: row.get(16),
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
                           taskgroups: Vec::new() })
            })
            .unwrap()
            .unwrap()
    }

    fn get_submission_to_validate(&self, tasklocation: &str, subtask: Option<&str>) -> i32 {
        match subtask {
            Some(st) => {
                let query = "SELECT id
                             FROM submission
                             JOIN task ON submission.task = task.id
                             WHERE task.location = ?1
                             AND subtask_identifier = ?2
                             AND needs_validation = 1
                             LIMIT 1";
                self.query_map_one(query, &[&tasklocation, &st], |row| row.get(0)).unwrap().unwrap()
            }
            None => {
                let query = "SELECT id
                             FROM submission
                             JOIN task ON submission.task = task.id
                             WHERE task.location = ?1
                             AND needs_validation = 1
                             LIMIT 1";
                self.query_map_one(query, &[&tasklocation], |row| row.get(0)).unwrap().unwrap()
            }
        }
    }

    fn find_next_submission_to_validate(&self, userid: i32, taskgroupid: i32) {
        let query = "SELECT id, validated
                     FROM submission
                     JOIN task ON submission.task = task.id
                     WHERE task.taskgroup = ?1
                     AND submission.session = ?2
                     ORDER BY value DESC id DESC
                     LIMIT 1";
        let (id, validated): (i32, bool) =
            self.query_map_one(query, &[&taskgroupid, &userid], |row| (row.get(0), row.get(1))).unwrap().unwrap();
        if !validated {
            let query = "UPDATE submission
                         SET needs_validation = 1
                         WHERE id = ?1";
            self.execute(query, &[&id]).unwrap();
        }
    }

    fn add_group(&self, group: &mut Group) { group.save(self); }

    fn get_groups(&self, session_id: i32) -> Vec<Group> {
        let query = "SELECT id, name, groupcode, tag
                     FROM usergroup
                     WHERE admin = ?1";
        self.query_map_many(query, &[&session_id], |row| Group { id: Some(row.get(0)),
                                                                 name: row.get(1),
                                                                 groupcode: row.get(2),
                                                                 tag: row.get(3),
                                                                 admin: session_id,
                                                                 members: Vec::new() })
            .unwrap()
    }
    fn get_groups_complete(&self, _session_id: i32) -> Vec<Group> {
        unimplemented!();
    }
    fn get_group_complete(&self, group_id: i32) -> Option<Group> {
        let query = "SELECT name, groupcode, tag, admin
                     FROM usergroup
                     WHERE id  = ?1";
        let mut group = self.query_map_one(query, &[&group_id], |row| Group { id: Some(group_id),
                                                                              name: row.get(0),
                                                                              groupcode: row.get(1),
                                                                              tag: row.get(2),
                                                                              admin: row.get(3),
                                                                              members: Vec::new() })
                            .unwrap()
                            .unwrap(); // TODO handle error

        let query = "SELECT id, session_token, csrf_token, last_login, last_activity, permanent_login, username,
                            password, logincode, email, email_unconfirmed, email_confirmationcode, firstname, lastname,
1352
                            street, zip, city, nation, grade, sex, is_admin, is_teacher, oauth_provider, oauth_foreign_id, salt
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
                     FROM session
                     WHERE managed_by = ?1";
        group.members = self.query_map_many(query, &[&group_id], |row| SessionUser { id: row.get(0),
                                                                                     session_token: row.get(1),
                                                                                     csrf_token: row.get(2),
                                                                                     last_login: row.get(3),
                                                                                     last_activity: row.get(4),
                                                                                     permanent_login: row.get(5),

                                                                                     username: row.get(6),
                                                                                     password: row.get(7),
                                                                                     salt: row.get(22),
                                                                                     logincode: row.get(8),
                                                                                     email: row.get(9),
                                                                                     email_unconfirmed: row.get(10),
                                                                                     email_confirmationcode:
                                                                                         row.get(11),

                                                                                     firstname: row.get(12),
                                                                                     lastname: row.get(13),
                                                                                     street: row.get(14),
                                                                                     zip: row.get(15),
                                                                                     city: row.get(16),
                                                                                     nation: row.get(17),
                                                                                     grade: row.get(18),
1378
                                                                                     sex: row.get(19),
1379

1380
1381
                                                                                     is_admin: row.get(20),
                                                                                     is_teacher: row.get(21),
1382
1383
                                                                                     managed_by: Some(group_id),

1384
1385
                                                                                     oauth_provider: row.get(22),
                                                                                     oauth_foreign_id: row.get(23) })
1386
1387
1388
                            .unwrap();
        Some(group)
    }
1389
    fn get_search_users(&self,
1390
1391
                        (s_id, s_firstname, s_lastname, s_logincode, s_groupcode, s_pms_id): (Option<i32>,
                         Option<String>,
1392
1393
1394
1395
                         Option<String>,
                         Option<String>,
                         Option<String>,
                         Option<String>))
1396
                        -> Result<Vec<(i32, Option<String>, Option<String>)>, Vec<(i32, String, String)>>
1397
1398
1399
1400
1401
1402
    {
        if let Some(id) = s_id {
            let query = "SELECT id, firstname, lastname
                         FROM session
                         WHERE id = ?1
                         LIMIT 30";
1403
            Ok(self.query_map_many(query, &[&id], |row| (row.get(0), row.get(1), row.get(2))).unwrap())
1404
1405
1406
1407
1408
        } else if let Some(logincode) = s_logincode {
            let query = "SELECT id, firstname, lastname
                         FROM session
                         WHERE logincode = ?1
                         LIMIT 30";
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
            Ok(self.query_map_many(query, &[&logincode], |row| (row.get(0), row.get(1), row.get(2))).unwrap())
        } else if let Some(groupcode) = s_groupcode {
            let query = "SELECT id, name, tag
                         FROM usergroup
                         WHERE groupcode = ?1
                         LIMIT 30";
            Err(self.query_map_many(query, &[&groupcode], |row| {
                        (row.get(0),
                         format!("Gruppe: {}", row.get::<_, String>(1)),
                         format!("(Marker: {})", row.get::<_, String>(2)))
                    })
                    .unwrap())
1421
1422
1423
1424
1425
        } else if let Some(pms_id) = s_pms_id {
            let query = "SELECT id, firstname, lastname
                         FROM session
                         WHERE oauth_foreign_id = ?1
                         LIMIT 30";
1426
            Ok(self.query_map_many(query, &[&pms_id], |row| (row.get(0), row.get(1),