telodendria/src/Routes/RouteJoinRoom.c

/*
 * Copyright (C) 2022-2024 Jordan Bancino <@jordan:bancino.net> with
 * other valuable contributors. See CONTRIBUTORS.txt for the full list.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation files
 * (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include <Routes.h>


#include <Cytoplasm/HashMap.h>
#include <Cytoplasm/Memory.h>
#include <Cytoplasm/Json.h>
#include <Cytoplasm/Str.h>

#include <string.h>

#include <Config.h>
#include <User.h>
#include <Room.h>

#include <Schema/Filter.h>

ROUTE_IMPL(RouteJoinRoom, path, argp)
{
    RouteArgs *args = argp;
    Db *db = args->matrixArgs->db;

    HashMap *request = NULL;
    HashMap *response = NULL;

    User *user = NULL;
    char *token = NULL;
    CommonID *id = NULL;

    char *roomId = ArrayGet(path, 0);
    char *sender = NULL, *serverName = NULL;

    Room *room = NULL;

    char *err;

    if (!roomId)
    {
        /* Should be impossible */
        HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
        return MatrixErrorCreate(M_UNKNOWN, NULL);
    }
    if (HttpRequestMethodGet(args->context) != HTTP_POST)
    {
        err = "Unknown request method.";
        HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
        response = MatrixErrorCreate(M_UNRECOGNIZED, err);
        goto finish;
    }

    request = JsonDecode(HttpServerStream(args->context));
    if (!request)
    {
        HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
        response = MatrixErrorCreate(M_NOT_JSON, NULL);
        goto finish;
    }

    serverName = ConfigGetServerName(db);
    if (!serverName)
    {
        HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
        response = MatrixErrorCreate(M_UNKNOWN, NULL);
        goto finish;
    }

    response = MatrixGetAccessToken(args->context, &token);
    if (response)
    {
        goto finish;
    }

    user = UserAuthenticate(db, token);
    if (!user)
    {
        HttpResponseStatus(args->context, HTTP_UNAUTHORIZED);
        response = MatrixErrorCreate(M_UNKNOWN_TOKEN, NULL);
        goto finish;
    }
    id = UserIdParse(UserGetName(user), serverName);
    id->sigil = '@';
    sender = ParserRecomposeCommonID(*id);
    
    room = RoomLock(db, roomId);
    if (!room)
    {

        err = "Room ID does not exist.";
        HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
        response = MatrixErrorCreate(M_UNKNOWN, err);
        goto finish;
    }
    if (RoomContainsUser(room, sender))
    {
        err = "User is already in the room.";
        HttpResponseStatus(args->context, HTTP_UNAUTHORIZED);
        response = MatrixErrorCreate(M_FORBIDDEN, err);
        goto finish;
    }
    if (!RoomCanJoin(room, sender))
    {
        err = "User cannot be in the room.";
        HttpResponseStatus(args->context, HTTP_UNAUTHORIZED);
        response = MatrixErrorCreate(M_FORBIDDEN, err);
        goto finish;
    }
    /* TODO: Custom reason parameter. */
    if (!RoomJoin(room, user))
    {
        err = "User could not be the room due to unknown reasons.";
        HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
        response = MatrixErrorCreate(M_UNKNOWN, err);
        goto finish;
    }

    response = HashMapCreate();
    JsonSet(response, JsonValueString(roomId), 1, "room_id");

finish:
    UserIdFree(id);
    JsonFree(request);
    if (sender)
    {
        Free(sender);
    }
    if (serverName)
    {
        Free(serverName);
    }
    RoomUnlock(room);
    UserUnlock(user);
    return response;
}