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* Message service.
* @packageDocumentation
*/
import { Injectable, Inject, forwardRef } from '@nestjs/common';
import { DBService } from '../db/db.service';
import { ResourceService } from '../resource/resource.service';
import { UserService } from '../user/user.service';
import { BlockService } from '../block/block.service';
import { NBMessage } from './message.interface';
import { ServiceException } from '../service.exception';
/**
* Message table name.
*/
export const messageTableName = 'NB_MESSAGE';
/**
* Message table service.
*/
@Injectable()
export class MessageService {
constructor(
@Inject(forwardRef(() => DBService))
private readonly dbService: DBService,
@Inject(forwardRef(() => ResourceService))
private readonly resourceService: ResourceService,
@Inject(forwardRef(() => UserService))
private readonly userService: UserService,
@Inject(forwardRef(() => BlockService))
private readonly blockService: BlockService,
) {}
/**
* Send a message.
*
* @param fromUserID The ID of the user sending the message.
* @param toUserID The ID of the user receiving the message.
* @param content The message content.
* @returns The new message record.
*/
public async sendMessage(
fromUserID: string,
toUserID: string,
content: string,
): Promise<NBMessage> {
const messageContentMaxLength =
await this.resourceService.getResource<number>(
'MESSAGE_CONTENT_MAX_LENGTH',
);
const fromUserExists = await this.userService.userExists(fromUserID);
const toUserExists = await this.userService.userExists(toUserID);
if (fromUserExists && toUserExists) {
const blocked1 = await this.blockService.isBlocked(fromUserID, toUserID);
const blocked2 = await this.blockService.isBlocked(toUserID, fromUserID);
if (!blocked1 && !blocked2) {
if (content.length >= 1 && content.length <= messageContentMaxLength) {
const message = await this.dbService.create<NBMessage>(
messageTableName,
{
fromUserID,
toUserID,
content,
},
);
await this.deleteOldMessages(fromUserID, toUserID);
return message;
} else {
throw new ServiceException(
`Message content must be between 1 and ${messageContentMaxLength} characters`,
);
}
} else {
throw new ServiceException('User is blocked');
}
} else {
throw new ServiceException('User does not exist');
}
}
/**
* Determine whether or not a message exists.
*
* @param messageID The message's ID.
* @returns Whether or not the message exists.
*/
public async messageExists(messageID: string): Promise<boolean> {
const message = await this.dbService.getByID<NBMessage>(
messageTableName,
messageID,
);
return !!message;
}
/**
* Get a message.
*
* @param messageID The message's ID.
* @returns The message record.
*/
public async getMessage(messageID: string): Promise<NBMessage> {
const message = await this.dbService.getByID<NBMessage>(
messageTableName,
messageID,
);
if (message) {
return message;
} else {
throw new ServiceException('Message does not exist');
}
}
/**
* Get a user's message threads.
*
* @param userID The user's ID.
* @returns
*/
public async getMessageThreads(userID: string): Promise<NBMessage[]> {
const userExists = await this.userService.userExists(userID);
if (userExists) {
const sql = `
WITH x AS (
SELECT
MAX("sendTime") "sendTime",
least("fromUserID", "toUserID") "userID1",
greatest("fromUserID", "toUserID") "userID2"
FROM "${messageTableName}"
GROUP BY
least("fromUserID", "toUserID"),
greatest("fromUserID", "toUserID")
)
SELECT "${messageTableName}".*
FROM "${messageTableName}"
JOIN x
ON "${messageTableName}"."sendTime" = x."sendTime"
WHERE "fromUserID" = ? OR "toUserID" = ?
ORDER BY "sendTime" DESC;
`;
const params = [userID, userID];
return this.dbService.execute<NBMessage>(sql, params);
} else {
throw new ServiceException('User does not exist');
}
}
/**
* Get message history for two users.
*
* @param userID1 One user's ID.
* @param userID2 Another user's ID.
* @returns Messages exchanged between two users.
*/
public async getMessages(
userID1: string,
userID2: string,
): Promise<NBMessage[]> {
const user1Exists = await this.userService.userExists(userID1);
const user2Exists = await this.userService.userExists(userID2);
if (user1Exists && user2Exists) {
return this.dbService.listCustom<NBMessage>(
messageTableName,
'("fromUserID" = ? AND "toUserID" = ?) OR ("fromUserID" = ? AND "toUserID" = ?)',
{ fieldName: 'sendTime', sortOrder: 'ASC' },
[userID1, userID2, userID2, userID1],
);
} else {
throw new ServiceException('User does not exist');
}
}
/**
* Mark a message as read.
*
* @param messageID The message's ID.
* @returns The updated message record.
*/
public async markRead(messageID: string): Promise<NBMessage> {
const message = await this.getMessage(messageID);
const sql = `
WITH updated AS (
UPDATE "${messageTableName}"
SET
"read" = TRUE
WHERE
"fromUserID" = ? AND "toUserID" = ? AND EXTRACT(EPOCH FROM "sendTime") <= ?
RETURNING *
)
SELECT *
FROM updated
WHERE id = ?;`;
const params = [
message.fromUserID,
message.toUserID,
message.sendTime / 1000 + 0.000999,
messageID,
];
const messages = await this.dbService.execute<NBMessage>(sql, params);
return messages[0];
}
/**
* Mark a message as unread.
*
* @param messageID The message's ID.
* @returns The updated message record.
*/
public async markUnread(messageID: string): Promise<NBMessage> {
const message = await this.getMessage(messageID);
const sql = `
WITH updated AS (
UPDATE "${messageTableName}"
SET
"read" = FALSE
WHERE
"fromUserID" = ? AND "toUserID" = ? AND EXTRACT(EPOCH FROM "sendTime") >= ?
RETURNING *
)
SELECT *
FROM updated
WHERE id = ?;`;
const params = [
message.fromUserID,
message.toUserID,
message.sendTime / 1000,
messageID,
];
const messages = await this.dbService.execute<NBMessage>(sql, params);
return messages[0];
}
/**
* Delete a message.
*
* @param messageID The message's ID.
*/
public async deleteMessage(messageID: string): Promise<void> {
await this.dbService.deleteByID(messageTableName, messageID);
}
/**
* Delete old messages.
*/
public async deleteOldMessages(
fromUserID: string,
toUserID: string,
): Promise<void> {
const maxMessages = await this.resourceService.getResource<number>(
'MAX_MESSAGES',
);
const fromUserExists = await this.userService.userExists(fromUserID);
const toUserExists = await this.userService.userExists(toUserID);
if (fromUserExists && toUserExists) {
const sql = `
DELETE FROM "${messageTableName}"
WHERE "fromUserID" = ? AND "toUserID" = ?
AND "id" NOT IN (
SELECT "id" FROM "${messageTableName}"
WHERE "fromUserID" = ? AND "toUserID" = ?
ORDER BY "sendTime" DESC
LIMIT ?
);
`;
const params = [fromUserID, toUserID, fromUserID, toUserID, maxMessages];
await this.dbService.execute(sql, params);
} else {
throw new ServiceException('User does not exist');
}
}
}
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