[MOD/FIX] Separate XMPP thread, fix EINVAL issue

threading is good actually. please hmu if you ever trigger the
achievement.

src/XMPPThread/PubsubAvatar.c

@@ -0,0 +1,85 @@
+#include "XMPPThread/internal.h"
+
+#include <Cytoplasm/Memory.h>
+#include <Cytoplasm/Json.h>
+#include <Cytoplasm/Str.h>
+
+#include <Parsee.h>
+#include <XMPP.h>
+#include <XML.h>
+
+/* Manages an avatar metadata pubsub item */
+static XMLElement *
+CreateAvatarRequest(char *from, char *to, char *avatar_id)
+{
+    XMLElement *iq_req, *pubsub, *items, *item;
+    char *id;
+    iq_req = XMLCreateTag("iq");
+    XMLAddAttr(iq_req, "from", from);
+    XMLAddAttr(iq_req, "to", to);
+    XMLAddAttr(iq_req, "id", (id = StrRandom(16)));
+    XMLAddAttr(iq_req, "type", "get");
+
+    pubsub = XMLCreateTag("pubsub");
+    XMLAddAttr(pubsub, "xmlns", "http://jabber.org/protocol/pubsub");
+    XMLAddChild(iq_req, pubsub);
+
+    items = XMLCreateTag("items");
+    XMLAddAttr(items, "node", "urn:xmpp:avatar:data");
+    XMLAddChild(pubsub, items);
+
+    item = XMLCreateTag("item");
+    XMLAddAttr(item, "id", avatar_id);
+    XMLAddChild(items, item);
+
+    Free(id);
+    return iq_req;
+}
+
+
+void
+ManageProfileItem(ParseeData *args, XMLElement *item, XMLElement *stanza, XMPPThread *thr)
+{
+    XMPPComponent *jabber = args->jabber;
+    DbRef *avatars;
+    HashMap *json;
+
+    char *publisher = HashMapGet(item->attrs, "publisher");
+    char *id = HashMapGet(item->attrs, "id");
+    char *mxid;
+
+    avatars = DbLock(args->db, 1, "avatars");
+    if (!avatars)
+    {
+        avatars = DbCreate(args->db, 1, "avatars");
+    }
+    json = DbJson(avatars);
+
+    mxid = GrabString(json, 1, publisher);
+    if (mxid && StrEquals(mxid, id))
+    {
+        /* We have nothing to do. */
+        goto end;
+    }
+
+    /* We need to download the media to push it. Let's submit a pubsub request. */
+    {
+        char *from = HashMapGet(stanza->attrs, "to");
+        char *to = HashMapGet(stanza->attrs, "from");
+        char *url = HashMapGet(item->attrs, "url");
+        XMLElement *request = CreateAvatarRequest(from, to, id);
+
+        pthread_mutex_lock(&jabber->write_lock);
+        XMLEncode(jabber->stream, request);
+        StreamFlush(jabber->stream);
+        pthread_mutex_unlock(&jabber->write_lock);
+
+        XMLFreeElement(request);
+
+        (void) url; /* TODO */
+    }
+
+end:
+    DbUnlock(args->db, avatars);
+}
+