+
+struct xrds {
+ int nesting_level;
+ int in_xrd;
+ int current_service_priority;
+ int selected_service_priority; /* more here later */
+};
+
+
+void xrds_xml_start(void *data, const char *supplied_el, const char **attr) {
+ struct xrds *xrds = (struct xrds *) data;
+ int i;
+
+ ++xrds->nesting_level;
+
+ if (!strcasecmp(supplied_el, "XRD")) {
+ ++xrds->in_xrd;
+ syslog(LOG_DEBUG, "*** XRD CONTAINER BEGIN ***");
+ }
+
+ else if (!strcasecmp(supplied_el, "service")) {
+ xrds->current_service_priority = 0;
+ for (i=0; attr[i] != NULL; i+=2) {
+ if (!strcasecmp(attr[i], "priority")) {
+ xrds->current_service_priority = atoi(attr[i+1]);
+ }
+ }
+ }
+}
+
+
+void xrds_xml_end(void *data, const char *supplied_el) {
+ struct xrds *xrds = (struct xrds *) data;
+
+ --xrds->nesting_level;
+
+ if (!strcasecmp(supplied_el, "XRD")) {
+ --xrds->in_xrd;
+ syslog(LOG_DEBUG, "*** XRD CONTAINER END ***");
+ }
+
+ else if (!strcasecmp(supplied_el, "service")) {
+ /* this is where we should evaluate the service and do stuff */
+ xrds->current_service_priority = 0;
+ }
+}
+
+
+void xrds_xml_chardata(void *data, const XML_Char *s, int len) {
+ struct xrds *xrds = (struct xrds *) data;
+
+ syslog(LOG_DEBUG, "%2d xrds_xml_chardata()", xrds->nesting_level);
+ /* StrBufAppendBufPlain (xrds->CData, s, len, 0); */
+}
+
+
+/*
+ * Parse an XRDS document.
+ * If OpenID stuff is discovered, populate FIXME something and return nonzero
+ * If nothing useful happened, return 0.
+ */
+int parse_xrds_document(StrBuf *ReplyBuf) {
+ struct xrds xrds;
+
+ memset(&xrds, 0, sizeof (struct xrds));
+ XML_Parser xp = XML_ParserCreate(NULL);
+ if (xp) {
+ XML_SetUserData(xp, &xrds);
+ XML_SetElementHandler(xp, xrds_xml_start, xrds_xml_end);
+ XML_SetCharacterDataHandler(xp, xrds_xml_chardata);
+ XML_Parse(xp, ChrPtr(ReplyBuf), StrLength(ReplyBuf), 0);
+ XML_Parse(xp, "", 0, 1);
+ XML_ParserFree(xp);
+ }
+ else {
+ syslog(LOG_ALERT, "Cannot create XML parser");
+ }
+
+ return(0);
+}
+
+
+/*
+ * Attempt to perform YADIS discovery.
+ * If successful, returns nonzero and fills the session's claimed ID blah FIXME this comment
+ * If YADIS fails, returns 0 and does nothing else.
+ */
+int perform_yadis_discovery(StrBuf *YadisURL) {
+ int docbytes = (-1);
+ StrBuf *ReplyBuf = NULL;
+ int r;
+
+ if (YadisURL == NULL) return(0);
+ if (StrLength(YadisURL) == 0) return(0);
+
+
+
+
+
+
+ docbytes = fetch_http(YadisURL, &ReplyBuf);
+ if (docbytes < 0) {
+ return(0);
+ }
+ if (docbytes == 0) {
+ FreeStrBuf(&ReplyBuf);
+ return(0);
+ }
+
+ /* FIXME here we need to handle Yadis 1.0 section 6.2.5.
+ *
+ * The response from the server will be one of:
+ *
+ * 1. An HTML document with a <head> element that includes a <meta> element with http-equiv
+ * attribute, X-XRDS-Location,
+ *
+ * 2. HTTP response-headers that include an X-XRDS-Location response-header, together with a
+ * document
+ *
+ * 3. HTTP response-headers only, which MAY include an X-XRDS-Location response-header,
+ * a contenttype response-header specifying MIME media type, application/xrds+xml, or both.
+ *
+ * 4. A document of MIME media type, application/xrds+xml
+ *
+ * We are only handling case #4 here and assuming that the server returned an XRDS document.
+ */
+
+ /* Parse the XRDS document. */
+ r = parse_xrds_document(ReplyBuf);
+ FreeStrBuf(&ReplyBuf);
+ return(r);
+}
+
+