Begin working on filtering.

TODO.txt

@@ -14,8 +14,8 @@ Milestone: v0.4.0
 [~] /_telodendria/admin/config endpoint
     [ ] Update only certain values
 
-[ ] Client-Server API
-    [ ] 6: Filtering
+[~] Client-Server API
+    [~] 6: Filtering
     [~] 7: Events
         [ ] Compute size of JSON object in Canonical JSON
         [x] Rename Sha2.h to just Sha; add Sha1() function
@@ -32,6 +32,9 @@ Milestone: v0.4.0
         [ ] File descriptor exhaustion
 [ ] Random memory corruption after many requests.
 
+[ ] Refactor MatrixErrorCreate() to take a custom message.
+    This will make debugging a lot easier.
+
 Milestone: v0.5.0
 -----------------
 

src/Routes.c

@@ -41,6 +41,8 @@ RouterBuild(void)
         return NULL; \
     }
 
+    /* Matrix Specifification Routes */
+
     R("/.well-known/matrix/(client|server)", RouteWellKnown);
 
     R("/_matrix/client/versions", RouteVersions);
@@ -70,6 +72,11 @@ RouterBuild(void)
     R("/_matrix/client/v3/profile/(.*)", RouteUserProfile);
     R("/_matrix/client/v3/profile/(.*)/(avatar_url|displayname)", RouteUserProfile);
 
+    R("/_matrix/client/v3/user/(.*)/filter", RouteFilter);
+    R("/_matrix/client/v3/user/(.*)/filter/(.*)", RouteFilter);
+
+    /* Telodendria Admin API Routes */
+
     R("/_telodendria/admin/(restart|shutdown|stats)", RouteProcControl);
     R("/_telodendria/admin/config", RouteConfig);
     R("/_telodendria/admin/privileges", RoutePrivileges);

src/Routes/RouteFilter.c

@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2022-2023 Jordan Bancino <@jordan:bancino.net>
+ *
+ * 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 <string.h>
+
+#include <HashMap.h>
+#include <Memory.h>
+#include <User.h>
+#include <Json.h>
+#include <Str.h>
+
+static char *
+GetServerName(Db *db)
+{
+    char *name;
+
+    Config *config = ConfigLock(db);
+
+    if (!config)
+    {
+        return NULL;
+    }
+
+    name = StrDuplicate(config->serverName);
+
+    ConfigUnlock(config);
+
+    return name;
+}
+
+ROUTE_IMPL(RouteFilter, path, argp)
+{
+    RouteArgs *args = argp;
+    Db *db = args->matrixArgs->db;
+
+    HashMap *response = NULL;
+
+    User *user = NULL;
+    UserId *id = NULL;
+    char *token = NULL;
+
+    char *serverName = NULL;
+
+    char *userParam = ArrayGet(path, 0);
+
+    if (!userParam)
+    {
+        /* Should be impossible */
+        HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
+        return MatrixErrorCreate(M_UNKNOWN);
+    }
+
+    serverName = GetServerName(db);
+    if (!serverName)
+    {
+        HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
+        response = MatrixErrorCreate(M_UNKNOWN);
+        goto finish;
+    }
+
+    id = UserIdParse(userParam, serverName);
+    if (!id)
+    {
+        HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
+        response = MatrixErrorCreate(M_INVALID_PARAM);
+        goto finish;
+    }
+
+    if (!StrEquals(id->server, serverName))
+    {
+        HttpResponseStatus(args->context, HTTP_UNAUTHORIZED);
+        response = MatrixErrorCreate(M_UNAUTHORIZED);
+        goto finish;
+    }
+
+    response = MatrixGetAccessToken(args->context, &token);
+    if (response)
+    {
+        goto finish;
+    }
+
+    if (!StrEquals(id->localpart, UserGetName(user)))
+    {
+        HttpResponseStatus(args->context, HTTP_UNAUTHORIZED);
+        response = MatrixErrorCreate(M_INVALID_PARAM);
+        goto finish;
+    }
+
+    user = UserAuthenticate(db, token);
+    if (!user)
+    {
+        HttpResponseStatus(args->context, HTTP_UNAUTHORIZED);
+        response = MatrixErrorCreate(M_UNKNOWN_TOKEN);
+        goto finish;
+    }
+
+    if (ArraySize(path) == 2 && HttpRequestMethodGet(args->context) == HTTP_GET)
+    {
+        DbRef *ref = DbLock(db, 3, "filters", UserGetName(user), ArrayGet(path, 1));
+
+        if (!ref)
+        {
+            HttpResponseStatus(args->context, HTTP_NOT_FOUND);
+            response = MatrixErrorCreate(M_NOT_FOUND);
+            goto finish;
+        }
+
+        response = JsonDuplicate(DbJson(ref));
+        DbUnlock(db, ref);
+    }
+    else if (ArraySize(path) == 1 && HttpRequestMethodGet(args->context) == HTTP_POST)
+    {
+        /* TODO */
+        response = MatrixErrorCreate(M_UNKNOWN);
+    }
+    else
+    {
+        HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
+        response = MatrixErrorCreate(M_UNRECOGNIZED);
+    }
+
+finish:
+    Free(serverName);
+    UserIdFree(id);
+    UserUnlock(user);
+    return response;
+}

src/include/Routes.h

@@ -92,6 +92,8 @@ ROUTE(RouteStaticDefault);
 ROUTE(RouteStaticLogin);
 ROUTE(RouteStaticResources);
 
+ROUTE(RouteFilter);
+
 ROUTE(RouteProcControl);
 ROUTE(RouteConfig);
 ROUTE(RoutePrivileges);