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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 class Module : XmppStreamModule {
public static ModuleIdentity<Module> IDENTITY = new ModuleIdentity<Module>(NS_URI, "0084_user_avatars");
public signal void received_avatar(XmppStream stream, Jid jid, string id);
private PixbufStorage storage;
public Module(PixbufStorage storage) {
this.storage = storage;
}
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(stream, null, NS_URI_DATA, 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(stream, null, NS_URI_METADATA, NS_URI_METADATA, sha1, metadata_node);
}
public override void attach(XmppStream stream) {
stream.get_module(Pubsub.Module.IDENTITY).add_filtered_notification(stream, NS_URI_METADATA, on_pupsub_event);
}
public override void detach(XmppStream stream) { }
public void on_pupsub_event(XmppStream stream, Jid jid, string id, 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;
if (storage.has_image(id)) {
stream.get_module(Module.IDENTITY).received_avatar(stream, jid, id);
} else {
stream.get_module(Pubsub.Module.IDENTITY).request(stream, jid, NS_URI_DATA, on_pubsub_data_response);
}
}
public override string get_ns() { return NS_URI; }
public override string get_id() { return IDENTITY.id; }
private void on_pubsub_data_response(XmppStream stream, Jid jid, string? id, StanzaNode? node) {
if (node == null || id == null) {
return;
}
uint8[] image = Base64.decode(node.get_string_content());
string sha1 = Checksum.compute_for_data(ChecksumType.SHA1, image);
if (sha1 != id) {
warning("sha sum did not match for avatar from "+jid.to_string()+" expected="+id+", actual="+sha1);
return;
}
storage.store(id, image);
stream.get_module(Module.IDENTITY).received_avatar(stream, jid, id);
}
}
}
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