mod_http_altconnect: Imported from prosody-modules 6d5a19bdd718 w/changes

Changes from community version:

  - Add options to allow explicit control over whether BOSH/WS is advertised
  - Always serve XML at /host-meta (no guessing based on Accept), least surprising

1 files changed, 52 insertions, 0 deletions

diff --git a/plugins/mod_http_altconnect.lua b/plugins/mod_http_altconnect.lua
new file mode 100644
index 00000000..9252433e
--- /dev/null
+++ b/plugins/mod_http_altconnect.lua
@@ -0,0 +1,52 @@
+-- mod_http_altconnect
+-- XEP-0156: Discovering Alternative XMPP Connection Methods
+
+module:depends"http";
+
+local mm = require "prosody.core.modulemanager";
+local json = require"prosody.util.json";
+local st = require"prosody.util.stanza";
+local array = require"prosody.util.array";
+
+local advertise_bosh = module:get_option_boolean("advertise_bosh", true);
+local advertise_websocket = module:get_option_boolean("advertise_websocket", true);
+
+local function get_supported()
+	local uris = array();
+	if advertise_bosh and (mm.is_loaded(module.host, "bosh") or mm.is_loaded("*", "bosh")) then
+		uris:push({ rel = "urn:xmpp:alt-connections:xbosh", href = module:http_url("bosh", "/http-bind") });
+	end
+	if advertise_websocket and (mm.is_loaded(module.host, "websocket") or  mm.is_loaded("*", "websocket")) then
+		uris:push({ rel = "urn:xmpp:alt-connections:websocket", href = module:http_url("websocket", "xmpp-websocket"):gsub("^http", "ws") });
+	end
+	return uris;
+end
+
+
+local function GET_xml(event)
+	local response = event.response;
+	local xrd = st.stanza("XRD", { xmlns='http://docs.oasis-open.org/ns/xri/xrd-1.0' });
+	local uris = get_supported();
+	for _, method in ipairs(uris) do
+		xrd:tag("Link", method):up();
+	end
+	response.headers.content_type = "application/xrd+xml"
+	response.headers.access_control_allow_origin = "*";
+	return '<?xml version="1.0" encoding="UTF-8"?>' .. tostring(xrd);
+end
+
+local function GET_json(event)
+	local response = event.response;
+	local jrd = { links = get_supported() };
+	response.headers.content_type = "application/json"
+	response.headers.access_control_allow_origin = "*";
+	return json.encode(jrd);
+end;
+
+module:provides("http", {
+	default_path = "/.well-known";
+	route = {
+		["GET /host-meta"] = GET_xml;
+		["GET /host-meta.json"] = GET_json;
+	};
+});