Set an error message with MatrixErrorCreate whenever applicable (#45)

Closes #6.

Co-authored-by: Jordan Bancino <jordan@bancino.net>
Reviewed-on: Telodendria/Telodendria#45
Co-authored-by: lda <lda@freetards.xyz>
Co-committed-by: lda <lda@freetards.xyz>

src/Routes/RouteChangePwd.c

@@ -65,6 +65,8 @@ ROUTE_IMPL(RouteChangePwd, path, argp)
     char *token;
     char *newPassword;
 
+    char *msg;
+
     Config *config = ConfigLock(db);
 
     if (!config)
@@ -78,8 +80,9 @@ ROUTE_IMPL(RouteChangePwd, path, argp)
 
     if (HttpRequestMethodGet(args->context) != HTTP_POST)
     {
+        msg = "Route only supports POST.";
         HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-        response = MatrixErrorCreate(M_UNRECOGNIZED, NULL);
+        response = MatrixErrorCreate(M_UNRECOGNIZED, msg);
         goto finish;
     }
 
@@ -118,9 +121,10 @@ ROUTE_IMPL(RouteChangePwd, path, argp)
     newPassword = JsonValueAsString(HashMapGet(request, "new_password"));
     if (!newPassword)
     {
+        msg = "'new_password' is unset or not a string.";
         JsonFree(request);
         HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-        response = MatrixErrorCreate(M_BAD_JSON, NULL);
+        response = MatrixErrorCreate(M_BAD_JSON, msg);
         goto finish;
     }
 

src/Routes/RouteConfig.c

@@ -33,6 +33,7 @@ ROUTE_IMPL(RouteConfig, path, argp)
     RouteArgs *args = argp;
     HashMap *response;
     char *token;
+    char *msg;
 
     User *user = NULL;
     Config *config = NULL;
@@ -59,17 +60,19 @@ ROUTE_IMPL(RouteConfig, path, argp)
 
     if (!(UserGetPrivileges(user) & USER_CONFIG))
     {
+        msg = "User does not have the 'CONFIG' privilege.";
         HttpResponseStatus(args->context, HTTP_FORBIDDEN);
-        response = MatrixErrorCreate(M_FORBIDDEN, NULL);
+        response = MatrixErrorCreate(M_FORBIDDEN, msg);
         goto finish;
     }
 
     config = ConfigLock(args->matrixArgs->db);
     if (!config)
     {
+        msg = "Internal server error while locking configuration.";
         Log(LOG_ERR, "Config endpoint failed to lock configuration.");
         HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
-        response = MatrixErrorCreate(M_UNKNOWN, NULL);
+        response = MatrixErrorCreate(M_UNKNOWN, msg);
         goto finish;
     }
 
@@ -90,8 +93,9 @@ ROUTE_IMPL(RouteConfig, path, argp)
             newConf = ConfigParse(request);
             if (!newConf)
             {
+                msg = "Internal server error while parsing config.";
                 HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
-                response = MatrixErrorCreate(M_UNKNOWN, NULL);
+                response = MatrixErrorCreate(M_UNKNOWN, msg);
                 break;
             }
 
@@ -108,8 +112,9 @@ ROUTE_IMPL(RouteConfig, path, argp)
                 }
                 else
                 {
+                    msg = "Internal server error while writing the config.";
                     HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
-                    response = MatrixErrorCreate(M_UNKNOWN, NULL);
+                    response = MatrixErrorCreate(M_UNKNOWN, msg);
                 }
             }
             else
@@ -137,8 +142,9 @@ ROUTE_IMPL(RouteConfig, path, argp)
 
             if (!newConf)
             {
+                msg = "Internal server error while parsing config.";
                 HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
-                response = MatrixErrorCreate(M_UNKNOWN, NULL);
+                response = MatrixErrorCreate(M_UNKNOWN, msg);
                 break;
             }
 
@@ -155,8 +161,9 @@ ROUTE_IMPL(RouteConfig, path, argp)
                 }
                 else
                 {
+                    msg = "Internal server error while writing the config.";
                     HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
-                    response = MatrixErrorCreate(M_UNKNOWN, NULL);
+                    response = MatrixErrorCreate(M_UNKNOWN, msg);
                 }
             }
             else
@@ -170,8 +177,9 @@ ROUTE_IMPL(RouteConfig, path, argp)
             JsonFree(newJson);
             break;
         default:
+            msg = "Unknown request method.";
             HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-            response = MatrixErrorCreate(M_UNRECOGNIZED, "Unknown request method.");
+            response = MatrixErrorCreate(M_UNRECOGNIZED, msg);
             break;
     }
 

src/Routes/RouteCreateRoom.c

@@ -41,8 +41,9 @@ ROUTE_IMPL(RouteCreateRoom, path, argp)
 
     if (HttpRequestMethodGet(args->context) != HTTP_POST)
     {
+        err = "Unknown request method.";
         HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-        response = MatrixErrorCreate(M_UNRECOGNIZED, "Unknown request method.");
+        response = MatrixErrorCreate(M_UNRECOGNIZED, err);
         goto finish;
     }
 

src/Routes/RouteDeactivate.c

@@ -47,6 +47,8 @@ ROUTE_IMPL(RouteDeactivate, path, argp)
     User *user = NULL;
     Config *config = ConfigLock(db);
 
+    char *msg;
+
     (void) path;
 
     if (!config)
@@ -59,8 +61,9 @@ ROUTE_IMPL(RouteDeactivate, path, argp)
 
     if (HttpRequestMethodGet(args->context) != HTTP_POST)
     {
+        msg = "Route only accepts POST.";
         HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-        response = MatrixErrorCreate(M_UNRECOGNIZED, NULL);
+        response = MatrixErrorCreate(M_UNRECOGNIZED, msg);
         goto finish;
     }
 
@@ -128,8 +131,9 @@ ROUTE_IMPL(RouteDeactivate, path, argp)
 
     if (!UserDeleteTokens(user, NULL) || !UserDeactivate(user, NULL, NULL))
     {
+        msg = "Internal server error: couldn't remove user properly.";
         HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
-        response = MatrixErrorCreate(M_UNKNOWN, NULL);
+        response = MatrixErrorCreate(M_UNKNOWN, msg);
         goto finish;
     }
 

src/Routes/RouteFilter.c

@@ -69,6 +69,8 @@ ROUTE_IMPL(RouteFilter, path, argp)
 
     char *userParam = ArrayGet(path, 0);
 
+    char *msg;
+
     if (!userParam)
     {
         /* Should be impossible */
@@ -87,15 +89,17 @@ ROUTE_IMPL(RouteFilter, path, argp)
     id = UserIdParse(userParam, serverName);
     if (!id)
     {
+        msg = "Invalid user ID.";
         HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-        response = MatrixErrorCreate(M_INVALID_PARAM, NULL);
+        response = MatrixErrorCreate(M_INVALID_PARAM, msg);
         goto finish;
     }
 
     if (!StrEquals(id->server, serverName))
     {
+        msg = "Cannot use /filter for non-local users.";
         HttpResponseStatus(args->context, HTTP_UNAUTHORIZED);
-        response = MatrixErrorCreate(M_UNAUTHORIZED, NULL);
+        response = MatrixErrorCreate(M_UNAUTHORIZED, msg);
         goto finish;
     }
 
@@ -115,8 +119,9 @@ ROUTE_IMPL(RouteFilter, path, argp)
 
     if (!StrEquals(id->localpart, UserGetName(user)))
     {
+        msg = "Unauthorized to use /filter.";
         HttpResponseStatus(args->context, HTTP_UNAUTHORIZED);
-        response = MatrixErrorCreate(M_INVALID_PARAM, NULL);
+        response = MatrixErrorCreate(M_INVALID_PARAM, msg);
         goto finish;
     }
 
@@ -126,8 +131,9 @@ ROUTE_IMPL(RouteFilter, path, argp)
 
         if (!ref)
         {
+            msg = "The filter for this user was not found.";
             HttpResponseStatus(args->context, HTTP_NOT_FOUND);
-            response = MatrixErrorCreate(M_NOT_FOUND, NULL);
+            response = MatrixErrorCreate(M_NOT_FOUND, msg);
             goto finish;
         }
 
@@ -161,8 +167,9 @@ ROUTE_IMPL(RouteFilter, path, argp)
         filterId = StrRandom(12);
         if (!filterId)
         {
+            msg = "Couldn't generate random filter ID; this is unintended.";
             HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
-            response = MatrixErrorCreate(M_UNKNOWN, NULL);
+            response = MatrixErrorCreate(M_UNKNOWN, msg);
             goto finish;
         }
 
@@ -170,8 +177,9 @@ ROUTE_IMPL(RouteFilter, path, argp)
         if (!ref)
         {
             Free(filterId);
+            msg = "Couldn't write filter to the database, this is unintended.";
             HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
-            response = MatrixErrorCreate(M_UNKNOWN, NULL);
+            response = MatrixErrorCreate(M_UNKNOWN, msg);
             goto finish;
         }
 

src/Routes/RouteLogin.c

@@ -107,8 +107,9 @@ ROUTE_IMPL(RouteLogin, path, argp)
 
             if (loginRequest.type != REQUEST_TYPE_PASSWORD)
             {
+                msg = "Unsupported login type.";
                 HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-                response = MatrixErrorCreate(M_UNRECOGNIZED, NULL);
+                response = MatrixErrorCreate(M_UNRECOGNIZED, msg);
                 break;
             }
 
@@ -117,6 +118,7 @@ ROUTE_IMPL(RouteLogin, path, argp)
             val = HashMapGet(identifier, "type");
             if (!val)
             {
+                msg = "No login identifier type set.";
                 HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
                 response = MatrixErrorCreate(M_MISSING_PARAM, NULL);
                 break;
@@ -124,16 +126,18 @@ ROUTE_IMPL(RouteLogin, path, argp)
 
             if (JsonValueType(val) != JSON_STRING)
             {
+                msg = "Invalid login identifier type.";
                 HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-                response = MatrixErrorCreate(M_BAD_JSON, NULL);
+                response = MatrixErrorCreate(M_BAD_JSON, msg);
                 break;
             }
 
             type = JsonValueAsString(val);
             if (!StrEquals(type, "m.id.user"))
             {
+                msg = "Invalid login identifier type.";
                 HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-                response = MatrixErrorCreate(M_UNRECOGNIZED, NULL);
+                response = MatrixErrorCreate(M_UNRECOGNIZED, msg);
                 break;
             }
             if (!LoginRequestUserIdentifierFromJson(identifier, 
@@ -148,16 +152,18 @@ ROUTE_IMPL(RouteLogin, path, argp)
             userId = UserIdParse(userIdentifier.user, config->serverName);
             if (!userId)
             {
+                msg = "Invalid user ID.";
                 HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-                response = MatrixErrorCreate(M_BAD_JSON, NULL);
+                response = MatrixErrorCreate(M_BAD_JSON, msg);
                 break;
             }
 
             if (!StrEquals(userId->server, config->serverName)
                 || !UserExists(db, userId->localpart))
             {
+                msg = "Unknown user ID.";
                 HttpResponseStatus(args->context, HTTP_FORBIDDEN);
-                response = MatrixErrorCreate(M_FORBIDDEN, NULL);
+                response = MatrixErrorCreate(M_FORBIDDEN, msg);
                 break;
             }
             
@@ -171,8 +177,9 @@ ROUTE_IMPL(RouteLogin, path, argp)
 
             if (!user)
             {
+                msg = "Couldn't lock user.";
                 HttpResponseStatus(args->context, HTTP_FORBIDDEN);
-                response = MatrixErrorCreate(M_FORBIDDEN, NULL);
+                response = MatrixErrorCreate(M_FORBIDDEN, msg);
                 break;
             }
 
@@ -190,10 +197,11 @@ ROUTE_IMPL(RouteLogin, path, argp)
 
             if (!loginInfo)
             {
+                msg = "Invalid creditentials for user.";
                 UserUnlock(user);
 
                 HttpResponseStatus(args->context, HTTP_FORBIDDEN);
-                response = MatrixErrorCreate(M_FORBIDDEN, NULL);
+                response = MatrixErrorCreate(M_FORBIDDEN, msg);
                 break;
             }
 
@@ -229,8 +237,9 @@ ROUTE_IMPL(RouteLogin, path, argp)
 
             break;
         default:
+            msg = "Route only accepts GET and POST.";
             HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-            response = MatrixErrorCreate(M_UNRECOGNIZED, NULL);
+            response = MatrixErrorCreate(M_UNRECOGNIZED, msg);
             break;
     }
 

src/Routes/RouteLogout.c

@@ -38,14 +38,17 @@ ROUTE_IMPL(RouteLogout, path, argp)
 
     char *tokenstr;
 
+    char *msg;
+
     Db *db = args->matrixArgs->db;
 
     User *user;
 
     if (HttpRequestMethodGet(args->context) != HTTP_POST)
     {
+        msg = "This route only accepts POST.";
         HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-        return MatrixErrorCreate(M_UNRECOGNIZED, NULL);
+        return MatrixErrorCreate(M_UNRECOGNIZED, msg);
     }
 
     response = MatrixGetAccessToken(args->context, &tokenstr);
@@ -84,8 +87,9 @@ ROUTE_IMPL(RouteLogout, path, argp)
     {
         if (!UserDeleteToken(user, tokenstr))
         {
+            msg = "Internal server error: couldn't delete token.";
             HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
-            response = MatrixErrorCreate(M_UNKNOWN, NULL);
+            response = MatrixErrorCreate(M_UNKNOWN, msg);
             goto finish;
         }
 

src/Routes/RoutePrivileges.c

@@ -39,6 +39,8 @@ ROUTE_IMPL(RoutePrivileges, path, argp)
     JsonValue *val;
     int privileges;
 
+    char *msg;
+
     response = MatrixGetAccessToken(args->context, &token);
     if (response)
     {
@@ -55,8 +57,9 @@ ROUTE_IMPL(RoutePrivileges, path, argp)
 
     if (!(UserGetPrivileges(user) & USER_GRANT_PRIVILEGES))
     {
+        msg = "User doesn't have the GRANT_PRIVILEGES privilege";
         HttpResponseStatus(args->context, HTTP_FORBIDDEN);
-        response = MatrixErrorCreate(M_FORBIDDEN, NULL);
+        response = MatrixErrorCreate(M_FORBIDDEN, msg);
         goto finish;
     }
 
@@ -68,8 +71,9 @@ ROUTE_IMPL(RoutePrivileges, path, argp)
         user = UserLock(args->matrixArgs->db, ArrayGet(path, 0));
         if (!user)
         {
+            msg = "Unknown user.";
             HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-            response = MatrixErrorCreate(M_INVALID_PARAM, NULL);
+            response = MatrixErrorCreate(M_INVALID_PARAM, msg);
             goto finish;
         }
     }
@@ -90,8 +94,9 @@ ROUTE_IMPL(RoutePrivileges, path, argp)
             val = HashMapGet(request, "privileges");
             if (!val || JsonValueType(val) != JSON_ARRAY)
             {
+                msg = "'privileges' is unset or not an array.";
                 HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-                response = MatrixErrorCreate(M_BAD_JSON, NULL);
+                response = MatrixErrorCreate(M_BAD_JSON, msg);
                 break;
             }
 
@@ -116,8 +121,9 @@ ROUTE_IMPL(RoutePrivileges, path, argp)
 
             if (!UserSetPrivileges(user, privileges))
             {
+                msg = "Internal server error: couldn't set privileges.";
                 HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
-                response = MatrixErrorCreate(M_UNKNOWN, NULL);
+                response = MatrixErrorCreate(M_UNKNOWN, msg);
                 break;
             }
 
@@ -127,8 +133,9 @@ ROUTE_IMPL(RoutePrivileges, path, argp)
             HashMapSet(response, "privileges", JsonValueArray(UserEncodePrivileges(UserGetPrivileges(user))));
             break;
         default:
+            msg = "Route only accepts POST, PUT, DELETE, and GET.";
             HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-            response = MatrixErrorCreate(M_UNRECOGNIZED, NULL);
+            response = MatrixErrorCreate(M_UNRECOGNIZED, msg);
             goto finish;
             break;
     }

src/Routes/RouteProcControl.c

@@ -37,6 +37,7 @@ ROUTE_IMPL(RouteProcControl, path, argp)
     char *op = ArrayGet(path, 0);
     HashMap *response;
     char *token;
+    char *msg;
     User *user = NULL;
 
     response = MatrixGetAccessToken(args->context, &token);
@@ -55,11 +56,13 @@ ROUTE_IMPL(RouteProcControl, path, argp)
 
     if (!(UserGetPrivileges(user) & USER_PROC_CONTROL))
     {
+        msg = "User doesn't have PROC_CONTROL privilege.";
         HttpResponseStatus(args->context, HTTP_FORBIDDEN);
-        response = MatrixErrorCreate(M_FORBIDDEN, NULL);
+        response = MatrixErrorCreate(M_FORBIDDEN, msg);
         goto finish;
     }
 
+    msg = "Unknown operation.";
     switch (HttpRequestMethodGet(args->context))
     {
         case HTTP_POST:
@@ -74,7 +77,7 @@ ROUTE_IMPL(RouteProcControl, path, argp)
             else
             {
                 HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-                response = MatrixErrorCreate(M_UNRECOGNIZED, NULL);
+                response = MatrixErrorCreate(M_UNRECOGNIZED, msg);
                 goto finish;
             }
             break;
@@ -106,12 +109,12 @@ ROUTE_IMPL(RouteProcControl, path, argp)
             else
             {
                 HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-                response = MatrixErrorCreate(M_UNRECOGNIZED, NULL);
+                response = MatrixErrorCreate(M_UNRECOGNIZED, msg);
                 goto finish;
             }
         default:
             HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-            response = MatrixErrorCreate(M_UNRECOGNIZED, NULL);
+            response = MatrixErrorCreate(M_UNRECOGNIZED, msg);
             goto finish;
             break;
     }

src/Routes/RouteRefresh.c

@@ -45,6 +45,8 @@ ROUTE_IMPL(RouteRefresh, path, argp)
     UserAccessToken *newAccessToken;
     char *deviceId;
 
+    char *msg;
+
     Db *db = args->matrixArgs->db;
 
     User *user = NULL;
@@ -55,8 +57,9 @@ ROUTE_IMPL(RouteRefresh, path, argp)
 
     if (HttpRequestMethodGet(args->context) != HTTP_POST)
     {
+        msg = "This route only accepts POST.";
         HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-        return MatrixErrorCreate(M_UNRECOGNIZED, NULL);
+        return MatrixErrorCreate(M_UNRECOGNIZED, msg);
     }
 
     request = JsonDecode(HttpServerStream(args->context));
@@ -69,8 +72,9 @@ ROUTE_IMPL(RouteRefresh, path, argp)
     val = HashMapGet(request, "refresh_token");
     if (!val || JsonValueType(val) != JSON_STRING)
     {
+        msg = "'refresh_token' is unset or not a string.";
         HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-        response = MatrixErrorCreate(M_BAD_JSON, NULL);
+        response = MatrixErrorCreate(M_BAD_JSON, msg);
         goto finish;
     }
 

src/Routes/RouteRegister.c

@@ -86,9 +86,10 @@ ROUTE_IMPL(RouteRegister, path, argp)
 
     if (!config)
     {
+        msg = "Internal server error while locking configuration.";
         Log(LOG_ERR, "Registration endpoint failed to lock configuration.");
         HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
-        return MatrixErrorCreate(M_UNKNOWN, NULL);
+        return MatrixErrorCreate(M_UNKNOWN, msg);
     }
 
     if (ArraySize(path) == 0)
@@ -254,8 +255,9 @@ finish:
 
             if (!username)
             {
+                msg = "'username' path parameter is not set.";
                 HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-                response = MatrixErrorCreate(M_MISSING_PARAM, NULL);
+                response = MatrixErrorCreate(M_MISSING_PARAM, msg);
             }
             else if (!UserValidate(username, config->serverName))
             {

src/Routes/RouteRequestToken.c

@@ -54,8 +54,9 @@ ROUTE_IMPL(RouteRequestToken, path, argp)
 
     if (HttpRequestMethodGet(args->context) != HTTP_POST)
     {
+        msg = "This route only accepts POST.";
         HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-        return MatrixErrorCreate(M_UNRECOGNIZED, NULL);
+        return MatrixErrorCreate(M_UNRECOGNIZED, msg);
     }
 
     request = JsonDecode(HttpServerStream(args->context));

src/Routes/RouteTokenValid.c

@@ -41,13 +41,15 @@ ROUTE_IMPL(RouteTokenValid, path, argp)
     RegTokenInfo *info = NULL;
 
     char *tokenstr;
+    char *msg;
 
     (void) path;
 
     if (HttpRequestMethodGet(args->context) != HTTP_GET)
     {
+        msg = "This route only accepts GET.";
         HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-        return MatrixErrorCreate(M_UNRECOGNIZED, NULL);
+        return MatrixErrorCreate(M_UNRECOGNIZED, msg);
     }
 
     request = JsonDecode(HttpServerStream(args->context));

src/Routes/RouteUiaFallback.c

@@ -36,6 +36,8 @@ ROUTE_IMPL(RouteUiaFallback, path, argp)
     char *authType = ArrayGet(path, 0);
     char *sessionId;
 
+    char *msg;
+
     if (!authType)
     {
         /* This should never happen */
@@ -56,9 +58,10 @@ ROUTE_IMPL(RouteUiaFallback, path, argp)
         config = ConfigLock(args->matrixArgs->db);
         if (!config)
         {
+            msg = "Internal server error: failed to lock configuration.";
             Log(LOG_ERR, "UIA fallback failed to lock configuration.");
             HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
-            return MatrixErrorCreate(M_UNKNOWN, NULL);
+            return MatrixErrorCreate(M_UNKNOWN, msg);
         }
 
         request = JsonDecode(HttpServerStream(args->context));
@@ -93,15 +96,17 @@ ROUTE_IMPL(RouteUiaFallback, path, argp)
     }
     else if (HttpRequestMethodGet(args->context) != HTTP_GET)
     {
+        msg = "Route only supports GET.";
         HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-        return MatrixErrorCreate(M_UNRECOGNIZED, NULL);
+        return MatrixErrorCreate(M_UNRECOGNIZED, msg);
     }
 
     sessionId = HashMapGet(requestParams, "session");
     if (!sessionId)
     {
+        msg = "'session' parameter is unset.";
         HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-        return MatrixErrorCreate(M_MISSING_PARAM, NULL);
+        return MatrixErrorCreate(M_MISSING_PARAM, msg);
     }
 
     HttpResponseHeader(args->context, "Content-Type", "text/html");

src/Routes/RouteUserProfile.c

@@ -48,6 +48,8 @@ ROUTE_IMPL(RouteUserProfile, path, argp)
     char *token = NULL;
     char *value = NULL;
 
+    char *msg;
+
     Config *config = ConfigLock(db);
 
     if (!config)
@@ -63,15 +65,18 @@ ROUTE_IMPL(RouteUserProfile, path, argp)
     userId = UserIdParse(username, serverName);
     if (!userId)
     {
+        msg = "Invalid user ID.";
         HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-        response = MatrixErrorCreate(M_INVALID_PARAM, NULL);
+        response = MatrixErrorCreate(M_INVALID_PARAM, msg);
         goto finish;
     }
     if (strcmp(userId->server, serverName))
     {
         /* TODO: Implement lookup over federation. */
+        msg =   "User profile endpoint currently doesn't support lookup over "
+                "federation.";
         HttpResponseStatus(args->context, HTTP_FORBIDDEN);
-        response = MatrixErrorCreate(M_FORBIDDEN, NULL);
+        response = MatrixErrorCreate(M_FORBIDDEN, msg);
         goto finish;
     }
 
@@ -82,8 +87,9 @@ ROUTE_IMPL(RouteUserProfile, path, argp)
             user = UserLock(db, userId->localpart);
             if (!user)
             {
+                msg = "Couldn't lock user.";
                 HttpResponseStatus(args->context, HTTP_NOT_FOUND);
-                response = MatrixErrorCreate(M_NOT_FOUND, NULL);
+                response = MatrixErrorCreate(M_NOT_FOUND, msg);
                 goto finish;
             }
 
@@ -138,7 +144,7 @@ ROUTE_IMPL(RouteUserProfile, path, argp)
                     StrEquals(entry, "avatar_url"))
                 {
                     /* Check if user has privilege to do that action. */
-                    if (strcmp(userId->localpart, UserGetName(user)) == 0)
+                    if (StrEquals(userId->localpart, UserGetName(user)))
                     {
                         value = JsonValueAsString(HashMapGet(request, entry));
                         /* TODO: Make UserSetProfile notify other
@@ -148,14 +154,16 @@ ROUTE_IMPL(RouteUserProfile, path, argp)
                         goto finish;
                     }
                     /* User is not allowed to carry-on the action */
+                    msg = "Cannot change another user's profile.";
                     HttpResponseStatus(args->context, HTTP_FORBIDDEN);
-                    response = MatrixErrorCreate(M_FORBIDDEN, NULL);
+                    response = MatrixErrorCreate(M_FORBIDDEN, msg);
                     goto finish;
                 }
                 else
                 {
+                    msg = "Invalid property being changed.";
                     HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-                    response = MatrixErrorCreate(M_UNRECOGNIZED, NULL);
+                    response = MatrixErrorCreate(M_UNRECOGNIZED, msg);
                     goto finish;
                 }
             }
@@ -166,8 +174,9 @@ ROUTE_IMPL(RouteUserProfile, path, argp)
                 goto finish;
             }
         default:
+            msg = "Route only accepts GET and PUT.";
             HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
-            response = MatrixErrorCreate(M_UNKNOWN, NULL);
+            response = MatrixErrorCreate(M_UNKNOWN, msg);
             break;
     }
 finish:

src/Routes/RouteWellKnown.c

@@ -37,11 +37,14 @@ ROUTE_IMPL(RouteWellKnown, path, argp)
 
     Config *config = ConfigLock(args->matrixArgs->db);
 
+    char *msg;
+
     if (!config)
     {
         Log(LOG_ERR, "Well-known endpoint failed to lock configuration.");
+        msg = "Internal server error: couldn't lock database.";
         HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
-        return MatrixErrorCreate(M_UNKNOWN, NULL);
+        return MatrixErrorCreate(M_UNKNOWN, msg);
     }
 
     if (StrEquals(ArrayGet(path, 0), "client"))

src/Routes/RouteWhoami.c

@@ -42,14 +42,16 @@ ROUTE_IMPL(RouteWhoami, path, argp)
     char *token;
     char *userID;
     char *deviceID;
+    char *msg;
 
     Config *config = ConfigLock(db);
 
     if (!config)
     {
+        msg = "Internal server error: couldn't lock database.";
         Log(LOG_ERR, "Who am I endpoint failed to lock configuration.");
         HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
-        return MatrixErrorCreate(M_UNKNOWN, NULL);
+        return MatrixErrorCreate(M_UNKNOWN, msg);
     }
 
     (void) path;

src/Uia.c

@@ -222,6 +222,8 @@ UiaComplete(Array * flows, HttpServerContext * context, Db * db,
     HashMap *dbJson;
     int ret;
 
+    char *msg;
+
     if (!flows)
     {
         return -1;
@@ -242,8 +244,9 @@ UiaComplete(Array * flows, HttpServerContext * context, Db * db,
 
     if (JsonValueType(val) != JSON_OBJECT)
     {
+        msg = "'auth' is not an object.";
         HttpResponseStatus(context, HTTP_BAD_REQUEST);
-        *response = MatrixErrorCreate(M_BAD_JSON, NULL);
+        *response = MatrixErrorCreate(M_BAD_JSON, msg);
         return 0;
     }
 
@@ -252,8 +255,9 @@ UiaComplete(Array * flows, HttpServerContext * context, Db * db,
 
     if (!val || JsonValueType(val) != JSON_STRING)
     {
+        msg = "'auth->session' is unset or not a string.";
         HttpResponseStatus(context, HTTP_BAD_REQUEST);
-        *response = MatrixErrorCreate(M_BAD_JSON, NULL);
+        *response = MatrixErrorCreate(M_BAD_JSON, msg);
         return 0;
     }
 
@@ -311,8 +315,9 @@ UiaComplete(Array * flows, HttpServerContext * context, Db * db,
 
     if (!val || JsonValueType(val) != JSON_STRING)
     {
+        msg = "'auth->type' is unset or not a string.";
         HttpResponseStatus(context, HTTP_BAD_REQUEST);
-        *response = MatrixErrorCreate(M_BAD_JSON, NULL);
+        *response = MatrixErrorCreate(M_BAD_JSON, msg);
         ret = 0;
         goto finish;
     }