[MOD] Join rooms via alias

src/Routes.c

@@ -80,6 +80,8 @@ RouterBuild(void)
     R("/_matrix/client/v3/rooms/(.*)/event/(.*)", RouteFetchEvent);
     R("/_matrix/client/v3/rooms/(.*)/join", RouteJoinRoom);
 
+    R("/_matrix/client/v3/join/(.*)", RouteJoinRoomAlias);
+
     R("/_matrix/client/v3/createRoom", RouteCreateRoom);
 
     R("/_matrix/client/v3/directory/room/(.*)", RouteAliasDirectory);

src/Routes/RouteJoinRoomAlias.c

@@ -0,0 +1,190 @@
+/*
+ * 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 <User.h>
+#include <Room.h>
+#include <string.h>
+
+#include <Schema/Filter.h>
+
+static char *
+GetServerName(Db * db)
+{
+    char *name;
+
+    Config config;
+
+    ConfigLock(db, &config);
+    if (!config.ok)
+    {
+        return NULL;
+    }
+
+    name = StrDuplicate(config.serverName);
+
+    ConfigUnlock(&config);
+
+    return name;
+}
+
+ROUTE_IMPL(RouteJoinRoomAlias, 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 (*roomId != '!')
+    {
+        roomId = RoomResolveAlias(db, roomId);
+    }
+    else
+    {
+        roomId = StrDuplicate(roomId);
+    }
+    if (!roomId)
+    {
+        HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
+        response = MatrixErrorCreate(M_UNKNOWN, NULL);
+        goto finish;
+    }
+
+    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 = GetServerName(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:
+    Free(roomId);
+    UserIdFree(id);
+    JsonFree(request);
+    if (sender)
+    {
+        Free(sender);
+    }
+    if (serverName)
+    {
+        Free(serverName);
+    }
+    RoomUnlock(room);
+    UserUnlock(user);
+    return response;
+}

src/include/Routes.h

@@ -103,6 +103,7 @@ ROUTE(RouteCreateRoom);
 ROUTE(RouteFetchEvent);
 ROUTE(RouteSendEvent);
 ROUTE(RouteJoinRoom);
+ROUTE(RouteJoinRoomAlias);
 
 ROUTE(RouteAliasDirectory);
 ROUTE(RouteRoomAliases);