[ADD/WIP] Basic preset code

I still need to find a solution to a problem related to j2s.
Right now I kind of want to have a way for users to send events
from the endpoints.

src/Room.c

@@ -88,6 +88,11 @@ RoomPopulate(Room *room, User *user, RoomCreateRequest *req, ServerPart s)
     JsonValue *val;
     size_t i;
 
+    char *join_rules_preset = NULL;
+    char *history_visibility_preset = NULL;
+    char *guest_access_preset = NULL;
+    /* TODO: Manage trusted private chat */
+
     sender.sigil = '@';
     sender.local = UserGetName(user);
     sender.server = s;
@@ -135,16 +140,59 @@ RoomPopulate(Room *room, User *user, RoomCreateRequest *req, ServerPart s)
     switch (req->preset)
     {
         case ROOM_CREATE_PUBLIC:
-            /* TODO */
+            join_rules_preset = "public";
+            history_visibility_preset = "shared";
+            guest_access_preset = "forbidden";
             break;
         case ROOM_CREATE_TRUSTED:
             /* TODO */
-            break;
+            /* Fallthrough */
         case ROOM_CREATE_PRIVATE:
-            /* TODO */
+            join_rules_preset = "invite";
+            history_visibility_preset = "shared";
+            guest_access_preset = "can_join";
+            break;
+        default:
+            switch (req->visibility)
+            {
+                case ROOM_PUBLIC:
+                    join_rules_preset = "public";
+                    history_visibility_preset = "shared";
+                    guest_access_preset = "forbidden";
+                    break;
+                case ROOM_PRIVATE:
+                    join_rules_preset = "invite";
+                    history_visibility_preset = "shared";
+                    guest_access_preset = "can_join";
+                    break;
+            }
             break;
     }
 
+    /* Write out presets */
+#define SetIfExistent(pset) do { \
+                                if (pset##_preset) \
+                                { \
+                                    content = HashMapCreate(); \
+                                    JsonSet( \
+                                        content, \
+                                        JsonValueString(join_rules_preset) \
+                                        , 1, #pset); \
+                                    event = RoomEventCreate( \
+                                        sender_str,  \
+                                        "m.room." #pset, "", content); \
+                                    JsonFree(RoomEventSend(room, event)); \
+                                    JsonFree(event); \
+                                } \
+                            } \
+                            while (0)
+    
+    SetIfExistent(join_rules);
+    SetIfExistent(history_visibility);
+    SetIfExistent(guest_access);
+    /* TODO: On a trusted room, set invitees PLs to the owner's. */
+#undef SetIfExistent
+
     /* User-provided initial states */
     initial_states = req->initial_state;
     for (i = 0; i < ArraySize(initial_states); i++)
@@ -1842,3 +1890,53 @@ RoomResolveAlias(Db *db, char *roomAlias)
     DbUnlock(db, aliasRef);
     return ret;
 }
+Array *
+RoomReverseAlias(Db *db, char *roomId)
+{
+    DbRef *aliasRef;
+    HashMap *json, *idObject;
+    Array *ret, *original;
+    size_t i;
+    if (!db || !roomId)
+    {
+        return NULL;
+    }
+    aliasRef = DbLock(db, 1, "aliases");
+    if (!aliasRef)
+    {
+        return NULL;
+    }
+    json = DbJson(aliasRef);
+    if (!(idObject = 
+        JsonValueAsObject(JsonGet(json, 2, "id", roomId))))
+    {
+        DbUnlock(db, aliasRef);
+        return NULL;
+    }
+    original = JsonValueAsArray(HashMapGet(idObject, "aliases"));
+    ret = ArrayCreate();
+    
+    for (i = 0; i < ArraySize(original); i++)
+    {
+        JsonValue *v = ArrayGet(original, i);
+        ArrayAdd(ret, StrDuplicate(JsonValueAsString(v)));
+    }
+
+    DbUnlock(db, aliasRef);
+    return ret;
+}
+
+void
+RoomFreeReverse(Array *arr)
+{
+    size_t i;
+    if (!arr)
+    {
+        return;
+    }
+    for (i = 0; i < ArraySize(arr); i++)
+    {
+        Free(ArrayGet(arr, i));
+    }
+    ArrayFree(arr);
+}

src/Routes/RouteCreateRoom.c

@@ -81,6 +81,18 @@ ROUTE_IMPL(RouteCreateRoom, path, argp)
         goto finish;
     }
     
+    /* j2s hack: Setting to a default value like that.
+     * It's definitely NOT good(you can't rely on enums to 
+     * store values outside their limits in the C standard, 
+     * and this line will need to be changed everytime the 
+     * preset list is changed).
+     *
+     * I do believe a decent solution to this would be to 
+     * add a 'default' type(maybe initialised to 0 so that 
+     * memsets would work as intended), that *wouldn't* be 
+     * returned by j2s itself.
+     * TODO. */
+    parsed.preset = ROOM_CREATE_PRIVATE + 1;
     if (!RoomCreateRequestFromJson(request, &parsed, &err))
     {
         HttpResponseStatus(args->context, HTTP_BAD_REQUEST);

src/Routes/RouteRoomAliases.c

@@ -31,6 +31,7 @@
 
 #include <Matrix.h>
 #include <User.h>
+#include <Room.h>
 
 ROUTE_IMPL(RouteRoomAliases, path, argp)
 {
@@ -40,16 +41,15 @@ ROUTE_IMPL(RouteRoomAliases, path, argp)
     char *msg;
 
     HashMap *response = NULL;
-    HashMap *aliases = NULL;
-    HashMap *reversealias = NULL;
 
-    JsonValue *val;
+    Array *alias = NULL, *arr;
 
     Db *db = args->matrixArgs->db;
-    DbRef *ref = NULL;
 
     User *user = NULL;
 
+    size_t i;
+
     if (HttpRequestMethodGet(args->context) != HTTP_GET)
     {
         msg = "Route only accepts GET.";
@@ -82,10 +82,9 @@ ROUTE_IMPL(RouteRoomAliases, path, argp)
         goto finish;
     }
     
-    ref = DbLock(db, 1, "aliases");
-    aliases = DbJson(ref);
-    reversealias = JsonValueAsObject(JsonGet(aliases, 2, "id", roomId));
-    if (!reversealias)
+
+    alias = RoomReverseAlias(db, roomId);
+    if (!alias)
     {
         /* We do not know about the room ID. */
         msg = "Unknown room ID.";
@@ -93,12 +92,17 @@ ROUTE_IMPL(RouteRoomAliases, path, argp)
         response = MatrixErrorCreate(M_INVALID_PARAM, msg);
         goto finish;
     }
+    arr = ArrayCreate();
+    for (i = 0; i < ArraySize(alias); i++)
+    {
+        char *str = ArrayGet(alias, i);
+        ArrayAdd(arr, JsonValueString(str));
+    }
 
     response = HashMapCreate();
-    val = JsonGet(reversealias, 1, "aliases");
-    HashMapSet(response, "aliases", JsonValueDuplicate(val));
+    HashMapSet(response, "aliases", JsonValueArray(arr));
 finish:
-    DbUnlock(db, ref);
+    RoomFreeReverse(alias);
     UserUnlock(user);
     return response;
 }

src/include/Room.h

@@ -182,6 +182,18 @@ extern uint64_t RoomGetDepth(Room *);
  */
 extern char * RoomResolveAlias(Db *, char *);
 
+/**
+ * Tries to resolve a list of aliases from a room ID into 
+ * an array of strings stored on the heap.
+ */
+extern Array * RoomReverseAlias(Db *, char *);
+
+/**
+ * Frees the array returned by 
+ * .Fn RoomReverseAlias .
+ */
+extern void RoomFreeReverse(Array *);
+
 /**
  * Adds or overwrites a room alias.
  */