curl_json.cpp

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// Copyright (c) 2009-2014 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include "curl_json.h"
#include "util.h"
 
#include <openssl/evp.h>
 
JsonDownload downloadedJSON;
 
static size_t writer(char *in, size_t size, size_t nmemb, std::string *out)
{
      out->append((char*)in, size * nmemb);
      return size * nmemb;
}
 
void getHttpsJson(std::string url)
{
    {
        JsonDownload newDownload;
        downloadedJSON = newDownload;
    }
 
    downloadedJSON.failed = false;
    downloadedJSON.complete = false;
    downloadedJSON.URL = url;
    std::string response_string;
 
    curl_global_init(CURL_GLOBAL_ALL);
    CURL *curl;
    CURLcode res;
 
    struct curl_slist *headers=NULL; // init to NULL is important
 
    headers = curl_slist_append(headers, "Accept: application/json");
    headers = curl_slist_append(headers, "Content-Type: application/json");
    headers = curl_slist_append(headers, "charset: utf-8");
 
    curl = curl_easy_init();
    if(curl) {
 
        curl_easy_setopt(curl, CURLOPT_URL, downloadedJSON.URL.c_str());
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
        curl_easy_setopt(curl, CURLOPT_HTTPGET, 1);
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writer);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response_string);
        res = curl_easy_perform(curl);
 
        if(CURLE_OK == res) {
            char *ct;
            /* ask for the content-type */
            res = curl_easy_getinfo(curl, CURLINFO_CONTENT_TYPE, &ct);
            if((CURLE_OK == res) && ct) {
                downloadedJSON.response = response_string;
                downloadedJSON.failed = false;
                downloadedJSON.complete = true;
            }
        } else {
          downloadedJSON.response = "";
          downloadedJSON.failed = false;
          downloadedJSON.complete = false;
        }
    }
    /* always cleanup */
    curl_easy_cleanup(curl);
    curl_slist_free_all(headers);
    curl_global_cleanup();
 
}