Function makeHTTPGETCall

botlib.c:260–295

Request the specified URL in a blocking way, returns the content (or * error string) as an SDS string. If 'resptr' is not NULL, the integer * will be set, by reference, to 1 or 0 to indicate success or error. * The returned SDS string must be freed by the caller both in case of * error and success. */

 * The returned SDS string must be freed by the caller both in case of
 * error and success. */
sds makeHTTPGETCall(const char *url, int *resptr) {
    if (Bot.debug) printf("HTTP GET %s\n", url);
    CURL* curl;
    CURLcode res;
    sds body = sdsempty();

    curl = curl_easy_init();
    if (curl) {
        curl_easy_setopt(curl, CURLOPT_URL, url);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, makeHTTPGETCallWriterSDS);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &body);
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 1L);
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 1L);
        curl_easy_setopt(curl, CURLOPT_TIMEOUT, 15);
        curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 15);

        /* Perform the request, res will get the return code */
        res = curl_easy_perform(curl);
        if (resptr) *resptr = res == CURLE_OK ? 1 : 0;

        /* Check for errors */
        if (res != CURLE_OK) {
            const char *errstr = curl_easy_strerror(res);
            body = sdscat(body,errstr);
        } else {
            /* Return 0 if the request worked but returned a 500 code. */
            long code;
            curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
            if ((code == 500 || code == 400) && resptr) *resptr = 0;
        }

        /* always cleanup */
        curl_easy_cleanup(curl);
    }
    return body;
}

/* Like makeHTTPGETCall(), but the list of options will be concatenated to
 * the URL as a query string, and URL encoded as needed.