+/* Attempt to perform Yadis discovery as specified in Yadis 1.0 section 6.2.5.
+ * If successful, returns nonzero and calls parse_xrds_document() to act upon the received data.
+ * If Yadis fails, returns 0 and does nothing else.
+ */
+int perform_yadis_discovery(StrBuf *YadisURL) {
+ int docbytes = (-1);
+ StrBuf *ReplyBuf = NULL;
+ int r;
+ CURL *curl;
+ CURLcode result;
+ char errmsg[1024] = "";
+ struct curl_slist *my_headers = NULL;
+ StrBuf *x_xrds_location = NULL;
+
+ if (YadisURL == NULL) return(0);
+ if (StrLength(YadisURL) == 0) return(0);
+
+ ReplyBuf = NewStrBuf ();
+ if (ReplyBuf == 0) return(0);
+
+ curl = ctdl_openid_curl_easy_init(errmsg);
+ if (!curl) return(0);
+
+ curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(YadisURL));
+ curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
+ curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
+
+ my_headers = curl_slist_append(my_headers, "Accept:"); /* disable the default Accept: header */
+ my_headers = curl_slist_append(my_headers, "Accept: application/xrds+xml");
+ curl_easy_setopt(curl, CURLOPT_HTTPHEADER, my_headers);
+
+ curl_easy_setopt(curl, CURLOPT_WRITEHEADER, &x_xrds_location);
+ curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, yadis_headerfunction);
+
+ result = curl_easy_perform(curl);
+ if (result) {
+ syslog(LOG_DEBUG, "libcurl error %d: %s", result, errmsg);
+ }
+ curl_slist_free_all(my_headers);
+ curl_easy_cleanup(curl);
+ docbytes = StrLength(ReplyBuf);
+
+ /*
+ * The response from the server will be one of:
+ *
+ * Option 1: An HTML document with a <head> element that includes a <meta> element with http-equiv
+ * attribute, X-XRDS-Location,
+ */
+ /* FIXME handle this somehow */
+
+ /*
+ * Option 2: HTTP response-headers that include an X-XRDS-Location response-header,
+ * together with a document.
+ * Option 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.
+ *
+ * If the X-XRDS-Location header was delivered, we know about it at this point...
+ */
+ if (x_xrds_location) {
+ syslog(LOG_DEBUG, "\033[31m FIXME \033[32m'%s'\033[0m", ChrPtr(x_xrds_location));
+ FreeStrBuf(&x_xrds_location);
+ }
+
+ /*
+ * Option 4: the returned web page may *be* an XRDS document. Try to parse it.
+ */
+ r = 0;
+ if (docbytes >= 0) {
+ r = parse_xrds_document(ReplyBuf);
+ FreeStrBuf(&ReplyBuf);
+ }
+
+ return(r);
+}