Function botSendImage

botlib.c:337–395

Send an image using the sendPhoto endpoint. Return 1 on success, 0 * on error. */

/* Send an image using the sendPhoto endpoint. Return 1 on success, 0
 * on error. */
int botSendImage(int64_t target, char *filename) {
    CURL *curl;
    CURLcode res;
    int retval = 0;
    struct curl_httppost *formpost = NULL;
    struct curl_httppost *lastptr = NULL;

    /* Build the POST form to submit. */
    sds strtarget = sdsfromlonglong(target);
    curl_formadd(&formpost, &lastptr,
             CURLFORM_COPYNAME, "chat_id",
             CURLFORM_COPYCONTENTS, strtarget,
             CURLFORM_END);
    sdsfree(strtarget);

    curl_formadd(&formpost, &lastptr,
                 CURLFORM_COPYNAME, "photo",
                 CURLFORM_FILE, filename,
                 CURLFORM_END);

    curl = curl_easy_init();
    if (curl) {
        char url[1024];
        snprintf(url, sizeof(url),
            "https://api.telegram.org/bot%s/sendPhoto", Bot.apikey);
        curl_easy_setopt(curl, CURLOPT_URL, url);
        curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, makeHTTPGETCallWriterSDS);
        sds body = sdsempty(); // Accumulate the reply here.
        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);

        /* Check for errors */
        if (res == CURLE_OK) {
            retval = 1;
            /* 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) retval = 0;
        } else {
            retval = 0;
        }

        if (retval == 0)
            printf("sendImage() error from Telegram API: %s\n", body);
        sdsfree(body);

        /* always cleanup */
        curl_easy_cleanup(curl);
    }
    curl_formfree(formpost);
    return retval;