[ADD/WIP] Start introducing whitelist command

The whitelist system will also be managable from XMPP and Matrix, and
will be for MUC/room management.

tools/whitelist.c

@@ -0,0 +1,114 @@
+/* whitelist.c - Manages a Parsee MUC/user whitelist manually
+ * ============================================================
+ * Example of usage:
+ * parsee-whitelist [CONFIG] [add|del|remove|list] <user>
+ * Under CC0, as its a rather useful example of a Parsee tool.
+ * See LICENSE for more information about Parsee's licensing. */
+
+#include "common.h"
+
+#include <Cytoplasm/Str.h>
+
+int
+Main(Array *args, HashMap *env)
+{
+    int ret = EXIT_SUCCESS;
+    char *verb;
+    Db *db;
+    if (ArraySize(args) <= 2)
+    {
+        Log(LOG_ERR, 
+            "Usage: %s [CONFIG] [add|del|clear|list] <user>",
+            ArrayGet(args, 0)
+        );
+        return EXIT_FAILURE;
+    }
+
+    if (!(db = GetDB(ArrayGet(args, 1))))
+    {
+        Log(LOG_ERR, "Couldn't load database");
+        ret = EXIT_FAILURE;
+        goto end;
+    }
+
+    verb = ArrayGet(args, 2);
+    if (StrEquals(verb, "add"))
+    {
+        char *user = ArrayGet(args, 3);
+        DbRef *ref = !user ? NULL : DbLock(
+            db, 1, "whitelist"
+        );
+        if (!ref && user)
+        {
+            ref = DbCreate(
+                db, 1, "whitelist"
+            );
+        }
+
+        if (!user)
+        {
+            ret = EXIT_FAILURE;
+            goto end;
+        }
+        JsonValueFree(HashMapSet(
+            DbJson(ref),
+            user, JsonValueObject(HashMapCreate())
+        ));
+        DbUnlock(db, ref);
+    }
+    else if (StrEquals(verb, "del"))
+    {
+        char *user = ArrayGet(args, 3);
+        DbRef *ref = !user ? NULL : DbLock(
+            db, 1, "whitelist"
+        );
+        if (!ref && user)
+        {
+            ref = DbCreate(
+                db, 1, "whitelist"
+            );
+        }
+
+        if (!user)
+        {
+            ret = EXIT_FAILURE;
+            goto end;
+        }
+        JsonValueFree(HashMapDelete(DbJson(ref), user));
+        DbUnlock(db, ref);
+    }
+    else if (StrEquals(verb, "clear"))
+    {
+        DbDelete(db, 1, "whitelist");
+    }
+    else if (StrEquals(verb, "list"))
+    {
+        DbRef *ref = DbLockIntent(
+            db, DB_HINT_READONLY, 
+            1, "whitelist"
+        );
+        Array *keys = HashMapKeys(DbJson(ref));
+        size_t i;
+
+        for (i = 0; i < ArraySize(keys); i++)
+        {
+            char *key = ArrayGet(keys, i);
+
+            Log(LOG_INFO, "- %s", key);
+        }
+
+
+        ArrayFree(keys);
+        DbUnlock(db, ref);
+    }
+    else
+    {
+        ret = EXIT_FAILURE;
+        goto end;
+    }
+
+end:
+    (void) env;
+    DbClose(db);
+    return ret;
+}