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* Session service.
* @packageDocumentation
*/
import { Injectable, Inject, forwardRef } from '@nestjs/common';
import { DBService } from '../db/db.service';
import { ResourceService } from '../resource/resource.service';
import { UserService, userTableName } from '../user/user.service';
import { NBSession } from './session.interface';
import { NBUser } from '../user/user.interface';
import { ServiceException } from '../service.exception';
/**
* Session table name.
*/
export const sessionTableName = 'NB_SESSION';
/**
* Session table service.
*/
@Injectable()
export class SessionService {
constructor(
@Inject(forwardRef(() => DBService))
private readonly dbService: DBService,
@Inject(forwardRef(() => ResourceService))
private readonly resourceService: ResourceService,
@Inject(forwardRef(() => UserService))
private readonly userService: UserService,
) {}
/**
* Create a user session.
*
* @param userID The ID of the user creating the session.
* @returns The new session record.
*/
public async createSession(userID: string): Promise<NBSession> {
const userExists = await this.userService.userExists(userID);
if (userExists) {
const session = await this.dbService.create<NBSession>(sessionTableName, {
userID,
});
await this.deleteOldUserSessions(userID);
return session;
} else {
throw new ServiceException('User does not exist');
}
}
/**
* Determine whether or not a session exists.
*
* @param sessionID The session's ID.
* @returns Whether or not the session exists.
*/
public async sessionExists(sessionID: string): Promise<boolean> {
const session = await this.dbService.getByID<NBSession>(
sessionTableName,
sessionID,
);
return !!session;
}
/**
* Get a user session record.
*
* @param sessionID The session's ID.
* @returns The user session record.
*/
public async getSession(sessionID: string): Promise<NBSession> {
const res = await this.dbService.getByID<NBSession>(
sessionTableName,
sessionID,
);
if (res) {
return res;
} else {
throw new ServiceException('Session does not exist');
}
}
/**
* Get the user associated with a session.
*
* @param sessionID The session's ID.
* @returns The user associated with the session.
*/
public async getUserBySessionID(sessionID: string): Promise<NBUser> {
const sql = `
SELECT * FROM "${userTableName}" WHERE id = (
SELECT "userID" FROM "${sessionTableName}" WHERE id = ?
);`;
const params = [sessionID];
const res = await this.dbService.execute<NBUser>(sql, params);
if (res.length === 1) {
return res[0];
} else {
throw new ServiceException('Session does not exist');
}
}
/**
* Get all sessions associated with a user.
*
* @param userID The user's ID.
* @returns All sessions associated with the user.
*/
public async getUserSessions(userID: string): Promise<NBSession[]> {
const userExists = await this.userService.userExists(userID);
if (userExists) {
return this.dbService.listByFields<NBSession>(
sessionTableName,
{ userID },
{ fieldName: 'createTime', sortOrder: 'ASC' },
);
} else {
throw new ServiceException('User does not exist');
}
}
/**
* Delete a user session.
*
* @param sessionID The session's ID.
*/
public async deleteSession(sessionID: string): Promise<void> {
await this.dbService.deleteByID(sessionTableName, sessionID);
}
/**
* Delete all sessions associated with a user.
*
* @param userID The user's ID.
*/
public async deleteUserSessions(userID: string): Promise<void> {
await this.dbService.deleteByFields(sessionTableName, { userID });
}
/**
* Delete all old user sessions.
*
* @param userID The user's ID.
*/
public async deleteOldUserSessions(userID: string): Promise<void> {
const userExists = await this.userService.userExists(userID);
if (userExists) {
const userMaxSessions = await this.resourceService.getResource<number>(
'USER_MAX_SESSIONS',
);
const sql = `
DELETE FROM "${sessionTableName}"
WHERE "userID" = ?
AND "id" NOT IN (
SELECT "id" FROM "${sessionTableName}"
WHERE "userID" = ?
ORDER BY "createTime" DESC
LIMIT ?
);
`;
const params = [userID, userID, userMaxSessions];
await this.dbService.execute(sql, params);
} else {
throw new ServiceException('User does not exist');
}
}
}
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