Implement #27 (#36)

Implements #27.

Co-authored-by: LoaD Accumulator <lda@freetards.xyz>
Co-authored-by: Jordan Bancino <jordan@bancino.net>
Reviewed-on: Telodendria/telodendria#36
Co-authored-by: LoaD Accumulator <lda@noreply.git.telodendria.io>
Co-committed-by: LoaD Accumulator <lda@noreply.git.telodendria.io>

docs/CHANGELOG.md

@@ -24,6 +24,11 @@ The following endpoints were added:
 - Fixed a double-free in `RouteUserProfile()` that would cause errors with certain
 Matrix clients. (#35)
 
+### New Features
+
+Implemented `/_telodendria/admin/deactivate/[localpart]` for admins to be able to 
+deactivate users.
+
 ## v0.3.0
 
 **Saturday, June 10, 2023**

src/Routes.c

@@ -86,6 +86,7 @@ RouterBuild(void)
     R("/_telodendria/admin/config", RouteConfig);
     R("/_telodendria/admin/privileges", RoutePrivileges);
     R("/_telodendria/admin/privileges/(.*)", RoutePrivileges);
+    R("/_telodendria/admin/deactivate/(.*)", RouteAdminDeactivate);
 
 #undef R
 

src/Routes/RouteAdminDeactivate.c

@@ -0,0 +1,117 @@
+/*
+ * 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 <Json.h>
+#include <HashMap.h>
+#include <Str.h>
+
+#include <User.h>
+#include <Log.h>
+
+ROUTE_IMPL(RouteAdminDeactivate, path, argp)
+{
+    RouteArgs *args = argp;
+    HashMap *request = NULL;
+    HashMap *response = NULL;
+
+    JsonValue *val;
+    char *reason = "Deactivated by admin";
+    char *removedLocalpart = ArrayGet(path, 0);
+    char *token;
+
+    Db *db = args->matrixArgs->db;
+
+    User *user = NULL;
+    User *removed = NULL;
+
+    HttpRequestMethod method = HttpRequestMethodGet(args->context);
+
+    if ((method != HTTP_DELETE) && (method != HTTP_PUT))
+    {
+        char * msg = "Route only supports DELETE and PUT as for now.";
+        HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
+        return MatrixErrorCreate(M_UNRECOGNIZED, msg);
+    }
+    
+    if (method == HTTP_DELETE)
+    {
+        request = JsonDecode(HttpServerStream(args->context));
+        if (!request)
+        {
+            HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
+            return MatrixErrorCreate(M_NOT_JSON, NULL);
+        }
+        val = HashMapGet(request, "reason");
+        if (val && JsonValueType(val) == JSON_STRING)
+        {
+            reason = JsonValueAsString(val);
+        }
+    }
+
+
+    response = MatrixGetAccessToken(args->context, &token);
+    if (response)
+    {
+        goto finish;
+    }
+
+    user = UserAuthenticate(db, token);
+    removed = UserLock(db, removedLocalpart);
+    if (!user || !removed)
+    {
+        HttpResponseStatus(args->context, HTTP_BAD_REQUEST);
+        response = MatrixErrorCreate(M_UNKNOWN_TOKEN, NULL);
+        goto finish;
+    }
+
+    if (!(UserGetPrivileges(user) & USER_DEACTIVATE))
+    {
+        char * msg = "User doesn't have the DEACTIVATE privilege.";
+        HttpResponseStatus(args->context, HTTP_FORBIDDEN);
+        response = MatrixErrorCreate(M_FORBIDDEN, msg);
+        goto finish;
+    }
+    
+    if (method == HTTP_DELETE)    
+    {
+        UserDeactivate(removed, UserGetName(user), reason);
+        response = HashMapCreate();
+        
+        JsonSet(response, JsonValueString(removedLocalpart), 1, "user");
+        JsonSet(response, JsonValueString(reason), 1, "reason");
+        JsonSet(response, JsonValueString(UserGetName(user)), 1, "banned_by");
+    }
+    else
+    {
+        UserReactivate(removed);
+        HttpResponseStatus(args->context, HTTP_NO_CONTENT);
+    }
+
+finish:
+    UserUnlock(user);
+    UserUnlock(removed);
+    JsonFree(request);
+    return response;
+}

src/Routes/RouteDeactivate.c

@@ -126,7 +126,7 @@ ROUTE_IMPL(RouteDeactivate, path, argp)
         goto finish;
     }
 
-    if (!UserDeleteTokens(user, NULL) || !UserDeactivate(user))
+    if (!UserDeleteTokens(user, NULL) || !UserDeactivate(user, NULL, NULL))
     {
         HttpResponseStatus(args->context, HTTP_INTERNAL_SERVER_ERROR);
         response = MatrixErrorCreate(M_UNKNOWN, NULL);

src/User.c

@@ -429,7 +429,40 @@ UserSetPassword(User * user, char *password)
 }
 
 int
-UserDeactivate(User * user)
+UserDeactivate(User * user, char * from, char * reason)
+{
+    HashMap *json;
+    JsonValue *val;
+
+    if (!user)
+    {
+        return 0;
+    }
+    
+    /* By default, it's the target's username */
+    if (!from)
+    {
+        from = UserGetName(user);
+    }
+
+    json = DbJson(user->ref);
+
+    JsonValueFree(HashMapSet(json, "deactivated", JsonValueBoolean(1)));
+
+    val = JsonValueString(from);
+    JsonValueFree(JsonSet(json, val, 2, "deactivate", "by"));
+    if (reason)
+    {
+        val = JsonValueString(reason);
+        JsonValueFree(JsonSet(json, val, 2, "deactivate", "reason"));
+    }
+
+    return 1;
+
+}
+
+int
+UserReactivate(User * user)
 {
     HashMap *json;
 
@@ -440,7 +473,10 @@ UserDeactivate(User * user)
 
     json = DbJson(user->ref);
 
-    JsonValueFree(HashMapSet(json, "deactivated", JsonValueBoolean(1)));
+
+    JsonValueFree(HashMapSet(json, "deactivated", JsonValueBoolean(0)));
+    
+    JsonValueFree(HashMapDelete(json, "deactivate"));
 
     return 1;
 }

src/include/Routes.h

@@ -103,6 +103,8 @@ ROUTE(RouteCreateRoom);
 ROUTE(RouteAliasDirectory);
 ROUTE(RouteRoomAliases);
 
+ROUTE(RouteAdminDeactivate);
+
 #undef ROUTE
 
 #endif

src/include/User.h

@@ -199,14 +199,24 @@ extern int UserSetPassword(User *, char *);
  * is to prevent future users from pretending to be a previous user
  * of a given localpart. The user is logged out; all access tokens are
  * invalidated.
+ * Additionally, it stores information on who deactivated the account 
+ * (be it an admin or the user itself), and why. If the user
+ * responsible for deactivating the target user is NULL, then it is 
+ * set to the target's own name.
  */
-extern int UserDeactivate(User *);
+extern int UserDeactivate(User *, char *, char *);
+
+/**
+ * Reactivates the given user account if it has been deactvated with 
+ * .Fn UserDeactivate ,
+ * otherwise, it simply doesn't do anything.
+ */
+extern int UserReactivate(User *);
 
 /**
  * Return a boolean value indicating whether or not the user was
  * deactivated using
  * .Fn UserDeactivate .
- * Note that once deactivated, users cannot be reactivated.
  */
 extern int UserDeactivated(User *);