db_conn_sqlite_new.rs 80.1 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;

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use db_conn::{MedalConnection, MedalObject, SignupResult};
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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)
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            .map(|id| {
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                self.set_id(id);
            })
            .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)
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                .map(|id| {
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                    self.set_id(id);
                })
                .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)
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            .map(|id| {
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                self.set_id(id);
            })
            .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,
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                                 requires_login = ?12, secret = ?13, message = ?14
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                             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,
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                               &self.secret,
                               &self.message])
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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, message)
                             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10, ?11, ?12, ?13)";
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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,
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                               &self.secret,
                               &self.message])
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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,
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                          permanent_login = ?14,
                          email = ?15,
                          email_unconfirmed = ?16
                      WHERE id = ?17",
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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.email,
                       &session.email_unconfirmed,
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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();
    }

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    fn signup(&self, session_token: &str, username: &str, email: &str, password_hash: String, salt: &str) -> SignupResult {
        let mut session_user = self.get_session_or_new(&session_token);

        if session_user.is_logged_in() {
            return SignupResult::UserLoggedIn
        }

        if let Ok(None) = self.query_map_one("SELECT username FROM session WHERE username = ?1",
                             &[&username],
                                             |row| -> Option<String> { row.get(0) }) {} else {
            //This username already exists!
            return SignupResult::UsernameTaken
        }
        if let Ok(None) = self.query_map_one("SELECT email, email_unconfirmed FROM session WHERE email = ?1 OR email_unconfirmed = ?1",
                             &[&email],
                                             |row| -> (Option<String>, Option<String>) { (row.get(0), row.get(1)) }) {} else {
            //This email already exists!
            return SignupResult::EmailTaken
        }

        session_user.username = Some(username.to_string());
        session_user.email_unconfirmed = Some(email.to_string());
        session_user.password = Some(password_hash);
        session_user.salt = Some(salt.to_string());

        self.save_session(session_user);
        SignupResult::SignedUp
    }

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    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)),
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                                                                                    task,
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                                                                                    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)),
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                                     task,
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                                     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,
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                                                                                     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));
                }
1036
1037
                // 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();
1062
        wtr.flush().unwrap();
1063
1064
    }

1065
    fn get_contest_list(&self) -> Vec<Contest> {
1066
        let query = "SELECT id, location, filename, name, duration, public, start_date, end_date, min_grade, max_grade,
1067
                            positionalnumber, requires_login, secret, message
1068
                     FROM contest
1069
                     ORDER BY positionalnumber";
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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),
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                                                        min_grade: row.get(8),
                                                        max_grade: row.get(9),
1080
                                                        positionalnumber: row.get(10),
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                                                        requires_login: row.get(11),
                                                        secret: row.get(12),
1083
                                                        message: row.get(13),
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1088
                                                        taskgroups: Vec::new() })
            .unwrap()
    }

    fn get_contest_by_id(&self, contest_id: i32) -> Contest {
1089
        let query = "SELECT location, filename, name, duration, public, start_date, end_date, min_grade, max_grade,
1090
                            requires_login, secret, message
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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),
1101
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                                                                  min_grade: row.get(7),
                                                                  max_grade: row.get(8),
1103
                                                                  positionalnumber: None,
1104
1105
                                                                  requires_login: row.get(9),
                                                                  secret: row.get(10),
1106
                                                                  message: row.get(11),
1107
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1109
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1113
                                                                  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,
1114
                            contest.start_date, contest.end_date, contest.min_grade, contest.max_grade,
1115
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1117
                            contest.requires_login, contest.secret, contest.message,
                            taskgroup.id, taskgroup.name,
                            task.id, task.location, task.stars
1118
1119
1120
                     FROM contest
                     JOIN taskgroup ON contest.id = taskgroup.contest
                     JOIN task ON taskgroup.id = task.taskgroup
1121
                     WHERE contest.id = ?1
1122
                     AND taskgroup.active = ?2
1123
                     ORDER BY taskgroup.positionalnumber";
1124
        let taskgroupcontest =
1125
            self.query_map_many(query, &[&contest_id, &true], |row| {
1126
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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),
1134
1135
                               min_grade: row.get(7),
                               max_grade: row.get(8),
1136
                               positionalnumber: None,
1137
1138
                               requires_login: row.get(9),
                               secret: row.get(10),
1139
                               message: row.get(11),
1140
                               taskgroups: Vec::new() },
1141
                     Taskgroup { id: Some(row.get(12)),
1142
                                 contest: contest_id,
1143
                                 name: row.get(13),
1144
                                 active: true,
1145
1146
                                 positionalnumber: None,
                                 tasks: Vec::new() },
1147
                     Task { id: Some(row.get(14)), taskgroup: row.get(12), location: row.get(15), stars: row.get(16) })
1148
1149
                })
                .unwrap();
1150
        let mut taskgroupcontest_iter = taskgroupcontest.into_iter();
1151

1152
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        if let Some((mut contest, mut taskgroup, task)) = taskgroupcontest_iter.next() {
            taskgroup.tasks.push(task);
            for tgc in taskgroupcontest_iter {
                let (_, tg, t) = tgc;
                if tg.id != taskgroup.id {
                    contest.taskgroups.push(taskgroup);
                    taskgroup = tg;
                }
                taskgroup.tasks.push(t);
1161
            }
1162
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1164
1165
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1167
            contest.taskgroups.push(taskgroup);
            contest
        } else {
            // If the contest has no tasks, we fall back to the function, that does not try to gather the task
            // information
            self.get_contest_by_id(contest_id)
1168
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1170
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1172
        }
    }

    fn get_contest_by_id_partial(&self, contest_id: i32) -> Contest {
        let query = "SELECT contest.location, contest.filename, contest.name, contest.duration, contest.public,
1173
                            contest.start_date, contest.end_date, contest.min_grade, contest.max_grade,
1174
1175
                            contest.requires_login, contest.secret, contest.message,
                            taskgroup.id, taskgroup.name
1176
1177
                     FROM contest
                     JOIN taskgroup ON contest.id = taskgroup.contest
1178
1179
1180
                     WHERE contest.id = ?1
                     AND taskgroup.active = ?2";
        let taskgroupcontest = self.query_map_many(query, &[&contest_id, &true], |row| {
1181
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1184
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1186
1187
1188
                                       (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),
1189
1190
                                                  min_grade: row.get(7),
                                                  max_grade: row.get(8),
1191
                                                  positionalnumber: None,
1192
1193
                                                  requires_login: row.get(9),
                                                  secret: row.get(10),
1194
                                                  message: row.get(11),
1195
                                                  taskgroups: Vec::new() },
1196
                                        Taskgroup { id: Some(row.get(12)),
1197
                                                    contest: contest_id,
1198
                                                    name: row.get(13),
1199
                                                    active: true,
1200
1201
1202
1203
                                                    positionalnumber: None,
                                                    tasks: Vec::new() })
                                   })
                                   .unwrap();
1204
        let mut taskgroupcontest_iter = taskgroupcontest.into_iter();
1205

1206
        let (mut contest, taskgroup) = taskgroupcontest_iter.next().unwrap();
1207
1208
        contest.taskgroups.push(taskgroup);
        for tgc in taskgroupcontest_iter {
1209
1210
            let (_, tg) = tgc;
            contest.taskgroups.push(tg);
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
        }
        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()?
    }
1226
1227
1228

    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,
1229
                            contest.start_date, end_date, min_grade, max_grade, requires_login, secret, message
1230
1231
1232
1233
                     FROM participation
                     JOIN contest ON participation.contest = contest.id
                     WHERE participation.session = ?1";
        self.query_map_many(query, &[&session_id], |row| {
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
                (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),
1248
                           message: row.get(13),
1249
1250
1251
                           taskgroups: Vec::new() })
            })
            .unwrap()
1252
1253
    }

1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
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1265
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1283
1284
1285
1286
    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) {
1287
1288
        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,
1289
                            contest.start_date, contest.end_date, contest.min_grade, contest.max_grade,
1290
                            contest.requires_login, contest.secret, contest.message
1291
1292
1293
1294
1295
1296
                     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) },
1297
                 Taskgroup { id: Some(row.get(2)),
1298
                             contest: row.get(5),
1299
                             name: row.get(3),
1300
                             active: row.get(4),
1301
1302
                             positionalnumber: None,
                             tasks: Vec::new() },
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
                 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),
1313
                           positionalnumber: None,
1314
1315
                           requires_login: row.get(15),
                           secret: row.get(16),
1316
                           message: row.get(17),
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
1352
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1356
1357
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1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
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1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
                           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