Can anyone help me with porting some code from PHP to Go?

[ThePiachu]

http://stackoverflow.com/q/22315378/953732

I am trying to implement the following PHP code in Google App Engine Go:

    <?php

    

    function api_query(array $req = array()) {

            $key = '90294318da0162b082c3d27126be80c3873955f9';

     

            $req['method'] = 'getinfo';

            $req['nonce'] = 1394503747386411;

           

            // generate the POST data string

            $post_data = http_build_query($req, '', '&');

            $sign = '75da1e3ff750286bf73d03197f1b779fbfff963fd7402941ae326509a6615eacb839b44f236b4d5ee6cff39321e7b35e9563a9a2075e99df0f4ee3b732999348';

     

            // generate the extra headers

            $headers = array(

                    'Sign: '.$sign,

                    'Key: '.$key,

            );

     

            // our curl handle (initialize if required)

            static $ch = null;

            if (is_null($ch)) {

                    $ch = curl_init();

                    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

                    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; Cryptsy API PHP client; '.php_uname('s').'; PHP/'.phpversion().')');

            }

            curl_setopt($ch, CURLOPT_URL, 'https://api.cryptsy.com/api');

            curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);

            curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);

            

            // run the query

            $res = curl_exec($ch);

    

            if ($res === false) throw new Exception('Could not get reply: '.curl_error($ch));

            $dec = json_decode($res, true);

            if (!$dec) throw new Exception('Invalid data received, please make sure connection is working and requested API exists');

            

            echo "<pre>".print_r($dec, true)."</pre>";

            return $dec;

    }

     

    api_query();

When executed, the code returns a JSON array of values. I tried implementing the same code in Golang:

    func PrivateCall(c appengine.Context) (map[string]interface{}, error) {

    AuthAPI := "https://api.cryptsy.com/api"

    APIKey := "90294318da0162b082c3d27126be80c3873955f9"

    tr := urlfetch.Transport{Context: c}

    values := url.Values{}

    values.Set("method", "getinfo")

    values.Set("nonce", "1394503747386411")

    

    signature := "75da1e3ff750286bf73d03197f1b779fbfff963fd7402941ae326509a6615eacb839b44f236b4d5ee6cff39321e7b35e9563a9a2075e99df0f4ee3b732999348"

    

    req, err := http.NewRequest("POST", AuthAPI+"?"+values.Encode(), nil)

    if err != nil {

    c.Infof("API - Call - error 2 - %s", err.Error())

    return nil, err

    }

    req.Header.Set("Key", APIKey)

    req.Header.Set("Sign", signature)

    

    c.Infof("req - %v", req)

    resp, err := tr.RoundTrip(req)

    if err != nil {

    c.Errorf("API post error: %s", err)

    return nil, err

    }

    defer resp.Body.Close()

    //reading response

    body, err := ioutil.ReadAll(resp.Body)

    if err != nil {

    c.Errorf("API read error: could not read body: %s", err)

    return nil, err

    }

    result := make(map[string]interface{})

    //unmarshalling JSON response

    err = json.Unmarshal(body, &result)

    if err != nil {

    c.Infof("Unmarshal: %v", err)

    c.Infof("%s", body)

    return nil, err

    }

    return result, nil

    }

I am getting an error saying "Unable to Authorize Request - Check Your Post Data". Does anyone see what could've caused this error? At the moment my best guess is that perhaps the request header in Go is a map[string][]string, while in PHP it appears to be an array...

[Donovan Hide]

Looks like you're doing a POST with an empty body, making the assumption that http.NewRequest will put the querystring into the body for you. You need something like:

req, err := http.NewRequest("POST", AuthAPI,strings.NewReader(values.Encode()))

See the source of PostForm for more context:

http://golang.org/src/pkg/net/http/client.go?s=11554:11636#L368

Hope that helps!

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[Oleku Konko]

Updated your question with the answer ....