Send multipart/form-data json to webserver using cUrl

darongyi · 1 Feb 2019, 10:27

I have trouble with posting json data to server. I can't get json data from server.
Result is

HTTP/1.1 403 Forbidden
Date: Tue, 01 Jan 2019 14:19:36 GMT
Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips mod_wsgi/3.4 Python/2.7.5 mod_perl/2.0.10 Perl/v5.16.3
 Content-Length: 110
 Content-Type: text/json; charset=utf-8

This is my original code

I change code using cUrl.


void UpCurl::postHttpMultiPart()
{
    int res = 0;

    //---------- Curl
    CURLcode hResult;
    m_post = nullptr;
    m_last = nullptr;

    // Handle to the curl
    m_hCurl = curl_easy_init();

    // set up the header
    curl_formadd(&m_post,
        &m_last,
        CURLFORM_COPYNAME, "cache-control:",
        CURLFORM_COPYCONTENTS, "no-cache",
        CURLFORM_END);

    curl_formadd(&m_post,
        &m_last,
        CURLFORM_COPYNAME, "content-type:",
        CURLFORM_COPYCONTENTS, "multipart/form-data",
        CURLFORM_END);
    curl_easy_setopt(m_hCurl, CURLOPT_URL, qPrintable(MAIN_SERVER));
    curl_easy_setopt(m_hCurl, CURLOPT_VERBOSE, 1L);

    struct curl_slist *chunk = nullptr;


    QString m_token = authentication();
    QString header = QString("auth: %1").arg(m_token);
    if(header.size() > 0)
       chunk = curl_slist_append(chunk, qPrintable(header));
    QString contentType = "content-type: json";
    chunk = curl_slist_append(chunk, qPrintable(contentType));


    //curl_easy_setopt(m_hCurl, CURLOPT_HTTPHEADER, chunk);
    QByteArray postArray = postFields;

   //curl_easy_setopt(m_hCurl, CURLOPT_WRITEHEADER, write_data);
    curl_easy_setopt(m_hCurl, CURLOPT_WRITEFUNCTION,write_data);
    curl_easy_setopt(m_hCurl, CURLOPT_WRITEDATA, response);
    if(postFields.size() > 0)
    {   curl_easy_setopt(m_hCurl, CURLOPT_POST, 1L);
        curl_easy_setopt(m_hCurl, CURLOPT_POSTFIELDS,postArray.constData());


    }
    hResult = curl_easy_perform(m_hCurl);
    long code;
    curl_easy_getinfo(m_hCurl, CURLINFO_RESPONSE_CODE, &code);
    res = (hResult == CURLE_OK) ? code : hResult;
    curl_easy_cleanup(m_hCurl);
    curl_slist_free_all(chunk);
}

mrjj · 1 Jan 2019, 15:45

Hi
You seem to get
HTTP/1.1 403 Forbidden
Does your app have the correct permission to perform the action ?

So i wonder if that is the reason, it is not working ?

https://airbrake.io/blog/http-errors/403-forbidden-error

darongyi · 2 Jan 2019, 05:55

result is

"{"error":true,"code":"badip","message":"Unrecognized IP address (121.138.65.213) or bad authenticati"...

jsulm · 2 Jan 2019, 05:59

@darongyi Check whether your app has access rights or the IP is correct as @mrjj suggested.

darongyi · J jsulm 2 Jan 2019, 05:55

@jsulm
I access terminal .. result is like that.
yoshimi~$ perl -e ' print ""' | curl https://login.cridb.com/api/cridb -i -F json='{"command":"search","record_type":"thing","query":"tigra"}' -F 'auth=<-'
HTTP/1.1 100 Continue

HTTP/1.1 200 OK
Date: Wed, 02 Jan 2019 05:58:06 GMT
Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips mod_wsgi/3.4 Python/2.7.5 mod_perl/2.0.10 Perl/v5.16.3
Content-Length: 326
Content-Type: text/json; charset=utf-8

[{"subtype":"person","status":"online","name":"Tigra","type":"thing","id":"89792"},{"subtype":"person","status":"offline","name":"Tigran Vartanovich Petrosian","type":"thing","id":"35410"},{"subtype":"person","status":"offline","name":"Dikran II) Tigranes II (Tigranes the Great; also Tigran II","type":"thing","id":"44923"}]

darongyi · 1 Feb 2019, 07:52

Change code and get result this

<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\"><html><head><title>400 Bad Request</title></head><body><h1>Bad Request</h1><p>Your browser sent a request that this server could not understand.<br /></p></body></html>

size_t UpCurl::write_data(void *buffer, size_t size, size_t nmemb, 
void *userdata)
{

    UNUSED(userdata);

    stringstream strmResponse;
    size_t nReal = size * nmemb;
    strmResponse << string((char*)buffer, size*nmemb);
    string sLine("");

    QByteArray temp;
    while (getline(strmResponse, sLine)) {
        // Surcharge += : si jamais la réponse fait plusieurs lignes
        temp += sLine.c_str();
    }

    qDebug() << temp;
    return nReal;
}

code

void UpCurl::startUpload()
{

    CURLcode hResult;

    m_post = nullptr;
    m_last = nullptr;

 
    #ifdef WINDOWS
        curl_global_init(CURL_GLOBAL_WIN32);
    #endif
    #ifdef LINUX
        curl_global_init(CURL_GLOBAL_ALL);
    #endif

    // Handle to the curl
    m_hCurl = curl_easy_init();

    struct curl_slist *chunk = nullptr;

    // Specify the API Endpoint
    hResult = curl_easy_setopt(m_hCurl, CURLOPT_URL, qPrintable(m_curlUrl.c_str()));

    QString m_token = authentication();
    QString header = QString("auth: %1").arg(m_token);
    std::string h_auth = header.toStdString();


    if(header.size() > 0)
       chunk = curl_slist_append(chunk, h_auth.c_str());

    chunk = curl_slist_append(chunk, "content-type: multipart/form-data");
    curl_easy_setopt(m_hCurl, CURLOPT_HTTPHEADER, chunk);
//    QString contentType = "Content-Type: application/json";
//    chunk = curl_slist_append(chunk, qPrintable(contentType));

    std::string response;
    string jsonData = "json=" + postFields.toStdString();
    curl_formadd(&m_post, &m_last, CURLFORM_COPYNAME, "json",
                   CURLFORM_COPYCONTENTS, jsonData.c_str(), CURLFORM_END);

    // Recovering the server response
    curl_easy_setopt(m_hCurl, CURLOPT_WRITEFUNCTION, write_data);
    curl_easy_setopt(m_hCurl, CURLOPT_WRITEDATA, &response);
    // User-Agent
    curl_easy_setopt(m_hCurl, CURLOPT_USERAGENT, USER_AGENT);

    // Specify the HTTP Method
    curl_easy_setopt(m_hCurl, CURLOPT_NOPROGRESS, 1);
    curl_easy_setopt(m_hCurl, CURLOPT_POSTFIELDS, jsonData.c_str());
    curl_easy_setopt(m_hCurl, CURLOPT_POST, 1L);
    hResult = curl_easy_perform(m_hCurl);

    long code;
    int res = 0;
    curl_easy_getinfo(m_hCurl, CURLINFO_RESPONSE_CODE, &code);
    res = (hResult == CURLE_OK) ? code : hResult;
    curl_easy_cleanup(m_hCurl);
    curl_global_cleanup();

    finishProcedure(hResult);
}

darongyi · 2 Jan 2019, 09:48

@darongyi I think https://github.com/KoalaBR/spotlight/blob/ef90127ec6508b7822e57301e73c0ec7ca452333/reverseimagesearch.cpp
this is solution. modify code again.

darongyi · 2 Jan 2019, 15:06

@darongyi can't connect curl_mime osx

darongyi · wrote on 2 Jan 2019, 15:06

@darongyi If any idea, leave comment.
I decide to use qnetworkaccessmanager.
Thank u all.