namespace Xmpp.Xep.UserAvatars { private const string NS_URI = "urn:xmpp:avatar"; private const string NS_URI_DATA = NS_URI + ":data"; private const string NS_URI_METADATA = NS_URI + ":metadata"; public void publish_png(XmppStream stream, uint8[] image, int width, int height) { string sha1 = Checksum.compute_for_data(ChecksumType.SHA1, image); StanzaNode data_node = new StanzaNode.build("data", NS_URI_DATA).add_self_xmlns() .put_node(new StanzaNode.text(Base64.encode(image))); stream.get_module(Pubsub.Module.IDENTITY).publish.begin(stream, null, NS_URI_DATA, sha1, data_node); StanzaNode metadata_node = new StanzaNode.build("metadata", NS_URI_METADATA).add_self_xmlns(); StanzaNode info_node = new StanzaNode.build("info", NS_URI_METADATA) .put_attribute("bytes", image.length.to_string()) .put_attribute("id", sha1) .put_attribute("width", width.to_string()) .put_attribute("height", height.to_string()) .put_attribute("type", "image/png"); metadata_node.put_node(info_node); stream.get_module(Pubsub.Module.IDENTITY).publish.begin(stream, null, NS_URI_METADATA, sha1, metadata_node); } public async Bytes? fetch_image(XmppStream stream, Jid jid, string hash) { Gee.List? items = yield stream.get_module(Pubsub.Module.IDENTITY).request_all(stream, jid, NS_URI_DATA); if (items == null || items.size == 0 || items[0].sub_nodes.size == 0) return null; StanzaNode node = items[0].sub_nodes[0]; string? id = items[0].get_attribute("id", Pubsub.NS_URI); if (id == null) return null; Bytes image = new Bytes.take(Base64.decode(node.get_string_content())); string sha1 = Checksum.compute_for_bytes(ChecksumType.SHA1, image); if (sha1 != id) { warning("sha sum did not match for avatar from %s expected=%s actual=%s", jid.to_string(), id, sha1); return null; } return image; } public class Module : XmppStreamModule { public static ModuleIdentity IDENTITY = new ModuleIdentity(NS_URI, "0084_user_avatars"); public signal void received_avatar_hash(XmppStream stream, Jid jid, string id); public override void attach(XmppStream stream) { stream.get_module(Pubsub.Module.IDENTITY).add_filtered_notification(stream, NS_URI_METADATA, on_pupsub_event, null); } public override void detach(XmppStream stream) { stream.get_module(Pubsub.Module.IDENTITY).remove_filtered_notification(stream, NS_URI_METADATA); } public void on_pupsub_event(XmppStream stream, Jid jid, string hash, StanzaNode? node) { StanzaNode? info_node = node.get_subnode("info", NS_URI_METADATA); string? type = info_node == null ? null : info_node.get_attribute("type"); if (type != "image/png" && type != "image/jpeg") return; received_avatar_hash(stream, jid, hash); } public override string get_ns() { return NS_URI; } public override string get_id() { return IDENTITY.id; } } }