db_conn_postgres.rs 54.3 KB
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#![cfg(feature = "postgres")]

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extern crate postgres;

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use postgres::Connection;
use time;
use time::Duration;
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use db_conn::{MedalConnection, MedalObject};
use db_objects::*;
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use helpers;
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trait Queryable {
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    fn query_map_one<T, F>(&self, sql: &str, params: &[&dyn postgres::types::ToSql], f: F)
                           -> postgres::Result<Option<T>>
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        where F: FnOnce(postgres::rows::Row<'_>) -> T;
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    fn query_map_many<T, F>(&self, sql: &str, params: &[&dyn postgres::types::ToSql], f: F) -> postgres::Result<Vec<T>>
        where F: FnMut(postgres::rows::Row<'_>) -> T;
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    fn exists(&self, sql: &str, params: &[&dyn postgres::types::ToSql]) -> bool;
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    fn get_last_id(&self) -> Option<i32>;
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}

impl Queryable for Connection {
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    fn query_map_one<T, F>(&self, sql: &str, params: &[&dyn postgres::types::ToSql], f: F)
                           -> postgres::Result<Option<T>>
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        where F: FnOnce(postgres::rows::Row<'_>) -> T {
        let rows = self.query(sql, params)?;
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        Ok(rows.iter().next().map(f))
    }
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    fn query_map_many<T, F>(&self, sql: &str, params: &[&dyn postgres::types::ToSql], f: F) -> postgres::Result<Vec<T>>
        where F: FnMut(postgres::rows::Row<'_>) -> T {
        Ok(self.query(sql, params)?.iter().map(f).collect())
    }

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

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    fn get_last_id(&self) -> Option<i32> {
        self.query("SELECT lastval()", &[]).unwrap().iter().next().map(|row| {
                                                                      let r: i64 = row.get(0);
                                                                      r as i32
                                                                  })
    }
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    // Empty line intended
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}

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

    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();

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

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

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

        tx.batch_execute(&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, logincode,
                            email, email_unconfirmed, email_confirmationcode, firstname, lastname, street, zip, city,
                            nation, grade, is_teacher, managed_by, oauth_provider, oauth_foreign_id, salt
                     FROM session
                     WHERE session_token = $1";
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        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),
                                                                             salt: row.get(22),
                                                                             logincode: row.get(7),
                                                                             email: row.get(8),
                                                                             email_unconfirmed: row.get(9),
                                                                             email_confirmationcode: row.get(10),

                                                                             firstname: row.get(11),
                                                                             lastname: row.get(12),
                                                                             street: row.get(13),
                                                                             zip: row.get(14),
                                                                             city: row.get(15),
                                                                             nation: row.get(16),
                                                                             grade: row.get(17),

                                                                             is_teacher: row.get(18),
                                                                             managed_by: row.get(19),

                                                                             oauth_provider: row.get(20),
                                                                             oauth_foreign_id: row.get(21) })
                          .ok()??;
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        let duration = if session.permanent_login { Duration::days(90) } else { Duration::minutes(90) };
        let now = time::get_time();
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        if let Some(last_activity) = session.last_activity {
            if now - last_activity < duration {
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                let query = "UPDATE session
                             SET last_activity = $1
                             WHERE id = $2";
                self.execute(query, &[&now, &session.id]).unwrap();
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                return Some(session);
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            } else {
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                // Session timed out
                // Should remove session token from session
                return None;
            }
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        }
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        // last_activity undefined
        // TODO: What should happen here?
        None
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    }
    fn save_session(&self, session: SessionUser) {
        self.execute("UPDATE session SET
                      username = $1,
                      password = $2,
                      salt = $3,
                      logincode = $4,
                      firstname = $5,
                      lastname = $6,
                      street = $7,
                      zip = $8,
                      city = $9,
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                      grade = $10,
                      is_teacher = $11
                      WHERE id = $12",
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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.is_teacher,
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                       &session.id])
            .unwrap();
    }
    fn new_session(&self, session_token: &str) -> SessionUser {
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        let csrf_token = helpers::make_csrf_token();
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        let now = time::get_time();
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        let query = "INSERT INTO session (session_token, csrf_token, last_activity, permanent_login, grade,
                                          is_teacher)
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                     VALUES ($1, $2, $3, $4, $5, $6)";
        self.execute(query, &[&session_token, &csrf_token, &now, &false, &0, &false]).unwrap();
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        let id = self.get_last_id().expect("Expected to get last row id");

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        SessionUser::minimal(id, session_token.to_owned(), csrf_token)
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    }
    fn get_session_or_new(&self, key: &str) -> SessionUser {
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        let query = "UPDATE session
                     SET session_token = $1
                     WHERE session_token = $2";
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        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?
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                                                 self.execute(query, &[&Option::<String>::None, &key]).unwrap();
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                                                 self.new_session(&key)
                                             })
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    }

    fn get_user_by_id(&self, user_id: i32) -> Option<SessionUser> {
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        let query = "SELECT session_token, csrf_token, last_login, last_activity, permanent_login, username, password,
                            logincode, email, email_unconfirmed, email_confirmationcode, firstname, lastname, street,
                            zip, city, nation, grade, is_teacher, managed_by, oauth_provider, oauth_foreign_id, salt
                     FROM session
                     WHERE id = $1";
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        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),
                                                                   salt: row.get(22),
                                                                   logincode: row.get(7),
                                                                   email: row.get(8),
                                                                   email_unconfirmed: row.get(9),
                                                                   email_confirmationcode: row.get(10),

                                                                   firstname: row.get(11),
                                                                   lastname: row.get(12),
                                                                   street: row.get(13),
                                                                   zip: row.get(14),
                                                                   city: row.get(15),
                                                                   nation: row.get(16),
                                                                   grade: row.get(17),

                                                                   is_teacher: row.get(18),
                                                                   managed_by: row.get(19),

                                                                   oauth_provider: row.get(20),
                                                                   oauth_foreign_id: row.get(21) })
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            .ok()?
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    }

    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)),
        };

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        let query = "SELECT name, groupcode, tag, admin
                     FROM usergroup
                     WHERE id = $1";
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        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))),
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            _ => Some((session, None)),
        }
    }

    //TODO: use session
    fn login(&self, _session: Option<&str>, username: &str, password: &str) -> Result<String, ()> {
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        let query = "SELECT id, password, salt
                     FROM session
                     WHERE username = $1";
        self.query_map_one(query, &[&username], |row| {
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                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
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                if helpers::verify_password(&password,
                                            &salt.expect("salt from database empty"),
                                            &password_hash.expect("password from database empty"))
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                {
                    // TODO: fail more pleasantly
                    // Login okay, update session now!

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

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                    let query = "UPDATE session
                                 SET session_token = $1, csrf_token = $2, last_login = $3, last_activity = $3
                                 WHERE id = $4";
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                    self.execute(query, &[&session_token, &csrf_token, &now, &id]).unwrap();
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                    Ok(session_token)
                } else {
                    Err(())
                }
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            })
            .map_err(|_| ())?
            .ok_or(())?
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    }

    //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";
        self.query_map_one(query, &[&logincode], |row| {
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                // Login okay, update session now!
                let id: i32 = row.get(0);

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

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

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

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

    //TODO: use session
    fn create_user_with_groupcode(&self, _session: Option<&str>, groupcode: &str) -> Result<String, ()> {
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        let query = "SELECT id
                     FROM usergroup
                     WHERE groupcode = $1";
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        let group_id =
            self.query_map_one(query, &[&groupcode], |row| -> i32 { row.get(0) }).map_err(|_| ())?.ok_or(())?;
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        // Login okay, create session!
        let session_token = helpers::make_session_token();
        let csrf_token = helpers::make_csrf_token();
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        let login_code = helpers::make_login_code(); // TODO: check for collisions
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        let now = time::get_time();
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        let query = "INSERT INTO session (session_token, csrf_token, last_login, last_activity, permanent_login,
                                          logincode, grade, is_teacher, managed_by)
                     VALUES ($1, $2, $3, $3, $4, $5, $6, $7, $8)";
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        self.execute(query, &[&session_token, &csrf_token, &now, &false, &login_code, &0, &false, &group_id]).unwrap();
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        Ok(session_token)
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    }

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    fn create_group_with_users(&self, mut group: Group) {
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        // 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,
                                              is_teacher, managed_by)
                         VALUES ($1, $2, $3, $4, $5, $6, $7, $8)";
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            self.execute(query,
                         &[&user.firstname,
                           &user.lastname,
                           &csrf_token,
                           &false,
                           &login_code,
                           &user.grade,
                           &false,
                           &group.id])
                .unwrap();
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        }
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    }

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

    fn load_submission(&self, session: &SessionUser, task: i32, subtask: Option<&str>) -> Option<Submission> {
        match subtask {
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            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 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 {
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        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>)>)>) {
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        let query = "SELECT id, name
                     FROM taskgroup
                     WHERE contest = $1
                     ORDER BY id ASC";
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        let tasknames: Vec<(i32, String)> =
            self.query_map_many(query, &[&contest_id], |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,
                            student.firstname, student.lastname
                     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
                     ORDER BY usergroup.id, student.id, taskgroup.id ASC";
        let gradeinfo =
            self.query_map_many(query, &[&session_id, &contest_id], |row| {
                    (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),
                                lastname: row.get(12) })
                })
                .unwrap();
        let mut gradeinfo_iter = gradeinfo.iter();
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        if let Some(t /*Ok((grade, mut group, mut userinfo))*/) = gradeinfo_iter.next() {
528
            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;
535
            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();
550
                    grades = vec![Default::default(); n_tasks];
551
                }
552
                let index = g.taskgroup;
553
                grades[taskindex[&index]] = *g;
554
            }
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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> {
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        let query = "SELECT id, name
                     FROM taskgroup
                     WHERE contest = $1
                     ORDER BY id ASC";
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        let tasknames: Vec<(i32, String)> =
            self.query_map_many(query, &[&contest_id], |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
                     ORDER BY taskgroup.id ASC";
        let gradeinfo =
            self.query_map_many(query, &[&session_token, &contest_id], |row| Grade { taskgroup: row.get(0),
                                                                                     user: row.get(1),
                                                                                     grade: row.get(2),
                                                                                     validated: row.get(3) })
                .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;
596
            grades[taskindex[&index]] = *g;
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        }

        grades
    }

    fn get_taskgroup_user_grade(&self, session_token: &str, taskgroup_id: i32) -> Grade {
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        let query = "SELECT grade.taskgroup, grade.session, grade.grade, grade.validated
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                     FROM grade
                     JOIN session ON session.id = grade.session
                     WHERE session.session_token = $1
                     AND grade.taskgroup = $2";
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        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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    }

    fn get_contest_list(&self) -> Vec<Contest> {
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        let query = "SELECT id, location, filename, name, duration, public, start_date, end_date, min_grade, max_grade
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                     FROM contest
                     ORDER BY id";
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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),
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                                                        taskgroups: Vec::new() })
            .unwrap()
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    }

    fn get_contest_by_id(&self, contest_id: i32) -> Contest {
635
        let query = "SELECT location, filename, name, duration, public, start_date, end_date, min_grade, max_grade
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                     FROM contest
                     WHERE id = $1";
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        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),
648
                                                                  taskgroups: Vec::new() })
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            .unwrap()
            .unwrap() // TODO: Should return Option?
    }

    fn get_contest_by_id_complete(&self, contest_id: i32) -> Contest {
654
        let query = "SELECT contest.location, contest.filename, contest.name, contest.duration, contest.public,
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                            contest.start_date, contest.end_date, contest.min_grade, contest.max_grade, 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
                     WHERE contest.id = $1
661
                     ORDER BY taskgroup.positionalnumber";
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        let taskgroupcontest =
            self.query_map_many(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),
674
                               taskgroups: Vec::new() },
675
                     Taskgroup { id: Some(row.get(9)),
676
                                 contest: contest_id,
677
                                 name: row.get(10),
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                                 positionalnumber: None,
                                 tasks: Vec::new() },
680
                     Task { id: Some(row.get(11)), taskgroup: row.get(9), location: row.get(11), stars: row.get(13) })
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                })
                .unwrap();
        let mut taskgroupcontest_iter = taskgroupcontest.into_iter();
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        let (mut contest, mut taskgroup, task) = taskgroupcontest_iter.next().unwrap();
        taskgroup.tasks.push(task);
        for tgc in taskgroupcontest_iter {
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            let (_, tg, t) = tgc;
            if tg.id != taskgroup.id {
                contest.taskgroups.push(taskgroup);
                taskgroup = tg;
692
            }
693
            taskgroup.tasks.push(t);
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        }
        contest.taskgroups.push(taskgroup);
        contest
    }

    fn get_contest_by_id_partial(&self, contest_id: i32) -> Contest {
700
        let query = "SELECT contest.location, contest.filename, contest.name, contest.duration, contest.public,
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702
                            contest.start_date, contest.end_date, contest.min_grade, contest.max_grade, taskgroup.id,
                            taskgroup.name
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                     FROM contest
                     JOIN taskgroup ON contest.id = taskgroup.contest
                     WHERE contest.id = $1";
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        let taskgroupcontest = self.query_map_many(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),
717
                                                  taskgroups: Vec::new() },
718
                                        Taskgroup { id: Some(row.get(9)),
719
                                                    contest: contest_id,
720
                                                    name: row.get(10),
721
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                                                    positionalnumber: None,
                                                    tasks: Vec::new() })
                                   })
                                   .unwrap();
725
        let mut taskgroupcontest_iter = taskgroupcontest.into_iter();
726
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729

        let (mut contest, taskgroup) = taskgroupcontest_iter.next().unwrap();
        contest.taskgroups.push(taskgroup);
        for tgc in taskgroupcontest_iter {
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            let (_, tg) = tgc;
            contest.taskgroups.push(tg);
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        }
        contest
    }

    fn get_participation(&self, session: &str, contest_id: i32) -> Option<Participation> {
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        let query = "SELECT session, start_date
                     FROM participation
                     JOIN session ON session.id = session
                     WHERE session.session_token = $1
                     AND contest = $2";
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        self.query_map_one(query, &[&session, &contest_id], |row| Participation { contest: contest_id,
                                                                                  user: row.get(0),
                                                                                  start: row.get(1) })
            .ok()?
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747
    }
    fn new_participation(&self, session: &str, contest_id: i32) -> Result<Participation, ()> {
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        let query = "SELECT session, start_date
                     FROM participation
                     JOIN session ON session.id = session
                     WHERE session.session_token = $1
                     AND contest = $2";
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        match self.query_map_one(query, &[&session, &contest_id], |_| {}).map_err(|_| ())? {
            Some(()) => Err(()),
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757
            None => {
                let now = time::get_time();
                self.execute(
758
                             "INSERT INTO participation (contest, session, start_date)
759
                     SELECT $1, id, $2 FROM session WHERE session_token = $3",
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                             &[&contest_id, &now, &session],
                )
                    .unwrap();
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768

                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 {
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771
        let query = "SELECT location, stars, taskgroup
                     FROM task
                     WHERE id = $1";
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774
775
        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) })
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779
            .unwrap()
            .unwrap()
    }
    fn get_task_by_id_complete(&self, task_id: i32) -> (Task, Taskgroup, Contest) {
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781
        let query = "SELECT task.location, task.stars, taskgroup.id, taskgroup.name, contest.id, contest.location,
                            contest.filename, contest.name, contest.duration, contest.public, contest.start_date,
782
                            contest.end_date, contest.min_grade, contest.max_grade
783
784
785
786
                     FROM contest
                     JOIN taskgroup ON taskgroup.contest = contest.id
                     JOIN task ON task.taskgroup = taskgroup.id
                     WHERE task.id = $1";
787
788
        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) },
789
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791
792
793
                 Taskgroup { id: Some(row.get(2)),
                             contest: row.get(4),
                             name: row.get(3),
                             positionalnumber: None,
                             tasks: Vec::new() },
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796
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799
800
801
                 Contest { id: Some(row.get(4)),
                           location: row.get(5),
                           filename: row.get(6),
                           name: row.get(7),
                           duration: row.get(8),
                           public: row.get(9),
                           start: row.get(10),
                           end: row.get(11),
802
803
                           min_grade: row.get(12),
                           max_grade: row.get(13),
804
805
806
807
                           taskgroups: Vec::new() })
            })
            .unwrap()
            .unwrap()
808
809
810
811
    }

    fn get_submission_to_validate(&self, tasklocation: &str, subtask: Option<&str>) -> i32 {
        match subtask {
812
            Some(st) => {
813
814
815
816
817
818
819
                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";
820
821
822
                self.query_map_one(query, &[&tasklocation, &st], |row| row.get(0)).unwrap().unwrap()
            }
            None => {
823
824
825
826
827
828
                let query = "SELECT id
                             FROM submission
                             JOIN task ON submission.task = task.id
                             WHERE task.location = $1
                             AND needs_validation = 1
                             LIMIT 1";
829
830
                self.query_map_one(query, &[&tasklocation], |row| row.get(0)).unwrap().unwrap()
            }
831
832
833
834
        }
    }

    fn find_next_submission_to_validate(&self, userid: i32, taskgroupid: i32) {
835
836
837
838
839
840
841
        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";
842
843
        let (id, validated): (i32, bool) =
            self.query_map_one(query, &[&taskgroupid, &userid], |row| (row.get(0), row.get(1))).unwrap().unwrap();
844
        if !validated {
845
846
847
            let query = "UPDATE submission
                         SET needs_validation = 1
                         WHERE id = $1";
848
            self.execute(query, &[&id]).unwrap();
849
850
851
852
853
854
        }
    }

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

    fn get_groups(&self, session_id: i32) -> Vec<Group> {
855
856
857
        let query = "SELECT id, name, groupcode, tag
                     FROM usergroup
                     WHERE admin = $1";
858
859
860
861
862
863
        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() })
864
865
866
867
868
869
            .unwrap()
    }
    fn get_groups_complete(&self, _session_id: i32) -> Vec<Group> {
        unimplemented!();
    }
    fn get_group_complete(&self, group_id: i32) -> Option<Group> {
870
871
872
        let query = "SELECT name, groupcode, tag, admin
                     FROM usergroup
                     WHERE id  = $1";
873
874
875
876
877
878
        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() })
879
880
881
                            .unwrap()
                            .unwrap(); // TODO handle error

882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
        let query = "SELECT id, session_token, csrf_token, last_login, last_activity, permanent_login, username,
                            password, logincode, email, email_unconfirmed, email_confirmationcode, firstname, lastname,
                            street, zip, city, nation, grade, is_teacher, oauth_provider, oauth_foreign_id, salt
                     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),

                                                                                     is_teacher: row.get(19),
                                                                                     managed_by: Some(group_id),

                                                                                     oauth_provider: row.get(20),
                                                                                     oauth_foreign_id: row.get(21) })
                            .unwrap();
917
918
        Some(group)
    }
919

920
    fn reset_all_contest_visibilities(&self) { self.execute("UPDATE contest SET public = $1", &[&false]).unwrap(); }
921
922
923
924
}

impl MedalObject<Connection> for Task {
    fn save(&mut self, conn: &Connection) {
925
926
927
928
        let query = "SELECT id
                     FROM task
                     WHERE taskgroup = $1
                     AND location = $2";
929
930
        conn.query_map_one(query, &[&self.taskgroup, &self.location], |row| row.get(0))
            .unwrap_or(None)
931
932
933
934
935
936
937
938
            .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) => {
939
940
941
                let query = "UPDATE task
                             SET taskgroup = $1, location = $2, stars = $3
                             WHERE id = $4";
942
                conn.execute(query, &[&self.taskgroup, &self.location, &self.stars, &id]).unwrap();
943
944
945
                id
            }
            None => {
946
947
                let query = "INSERT INTO task (taskgroup, location, stars)
                             VALUES ($1, $2, $3)";
948
949
                conn.execute(query, &[&self.taskgroup, &self.location, &self.stars]).unwrap();
                conn.get_last_id().unwrap()
950
951
952
953
954
955
956
957
            }
        };
        self.set_id(id);
    }
}

impl MedalObject<Connection> for Taskgroup {
    fn save(&mut self, conn: &Connection) {
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
        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
        }
973
974
975

        let id = match self.get_id() {
            Some(id) => {
976
                let query = "UPDATE taskgroup
977
978
979
                             SET contest = $1, name = $2, positionalnumber = $3
                             WHERE id = $4";
                conn.execute(query, &[&self.contest, &self.name, &self.positionalnumber, &id]).unwrap();
980
981
982
                id
            }
            None => {
983
984
985
                let query = "INSERT INTO taskgroup (contest, name, positionalnumber)
                             VALUES ($1, $2, $3)";
                conn.execute(query, &[&self.contest, &self.name, &self.positionalnumber]).unwrap();
986
                conn.get_last_id().unwrap()
987
988
989
990
991
992
993
994
995
996
997
998
            }
        };
        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) {
999
1000
1001
1002
        let query = "SELECT id
                     FROM contest
                     WHERE location = $1
                     AND filename = $2";
1003
1004
        conn.query_map_one(query, &[&self.location, &self.filename], |row| row.get(0))
            .unwrap_or(None)
1005
1006
1007
1008
1009
1010
            .and_then(|id| {
                self.set_id(id);
                Some(())
            })
            .unwrap_or(()); // Err means no entry yet and is expected result

1011
1012
        let id = match self.get_id() {
            Some(id) => {
1013
                let query = "UPDATE contest
1014
1015
1016
                             SET location = $1,filename = $2, name = $3, duration = $4, public = $5, start_date = $6,
                                 end_date = $7, min_grade =$8 , max_grade = $9
                             WHERE id = $10";
1017
1018
1019
1020
1021
1022
1023
1024
                conn.execute(query,
                             &[&self.location,
                               &self.filename,
                               &self.name,
                               &self.duration,
                               &self.public,
                               &self.start,
                               &self.end,
1025
1026
                               &self.min_grade,
                               &self.max_grade,
1027
1028
1029
1030
1031
                               &id])
                    .unwrap();
                id
            }
            None => {
1032
1033
1034
                let query = "INSERT INTO contest (location, filename, name, duration, public, start_date, end_date,
                                                  min_grade, max_grade)
                             VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)";
1035
1036
1037
1038
1039
1040
1041
                conn.execute(query,
                             &[&self.location,
                               &self.filename,
                               &self.name,
                               &self.duration,
                               &self.public,
                               &self.start,
1042
1043
1044
                               &self.end,
                               &self.min_grade,
                               &self.max_grade])
1045
1046
1047
1048
                    .unwrap();
                conn.get_last_id().unwrap()
            }
        };
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
        self.set_id(id);
        for mut taskgroup in &mut self.taskgroups {
            taskgroup.contest = id;
            taskgroup.save(conn);
        }
    }
}

impl MedalObject<Connection> for Grade {
    fn save(&mut self, conn: &Connection) {
1059
1060
1061
        let query = "INSERT INTO grade (taskgroup, session, grade, validated)
                     VALUES ($1, $2, $3, $4)
                     ON CONFLICT ON CONSTRAINT grade_pkey DO UPDATE SET grade = excluded.grade, validated = excluded.validated";
1062
        conn.execute(query, &[&self.taskgroup, &self.user, &self.grade, &self.validated]).unwrap();
1063
1064
1065
1066
1067
    }
}

impl MedalObject<Connection> for Participation {
    fn save(&mut self, conn: &Connection) {
1068
1069
        let query = "INSERT INTO participation (contest, session, start_date)
                     VALUES ($1, $2, $3)";
1070
        conn.execute(query, &[&self.contest, &self.user, &self.start]).unwrap();
1071
1072
1073
1074
1075
1076
1077
1078
    }
}

impl MedalObject<Connection> for Submission {
    fn save(&mut self, conn: &Connection) {
        match self.get_id() {
            Some(_id) => unimplemented!(),
            None => {
1079
                let query = "INSERT INTO submission (task, session, grade, validated, nonvalidated_grade,
1080
                                                     subtask_identifier, value, date, needs_validation)
1081
                             VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)";
1082
1083
1084
1085
1086
1087
1088
1089
1090
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1092
1093
                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());
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
            }
        }
    }
}

impl MedalObject<Connection> for Group {
    fn save(&mut self, conn: &Connection) {
        match self.get_id() {
            Some(_id) => unimplemented!(),
            None => {
1104
1105
                let query = "INSERT INTO usergroup (name, groupcode, tag, admin)
                             VALUES ($1, $2, $3, $4)";
1106
1107
                conn.execute(query, &[&self.name, &self.groupcode, &self.tag, &self.admin]).unwrap();
                self.set_id(conn.get_last_id().unwrap());
1108
1109
1110
1111
            }
        }
    }
}