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POerror: Invalid Signature when uploading files on dropbox
 

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  1. POerror: Invalid Signature when uploading files on dropbox
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    <p>I am trying to develop a desktop application that uses dropbox. I am using C++, libcurl (for the requests) liboauthcpp (for the authentication) and the Rest API (from dropbox).</p> <p>Since I have successed the authentication and some more operations (list and download file), I cannot manage to upload a file. I am receiving the following error: {"error": "Invalid signature."}</p> <p>Here is my code:</p> <pre><code>m_upload_url = "https://api-content.dropbox.com/1/files/sandbox/"; OAuth::Consumer consumer(m_consumer_key, m_consumer_secret); OAuth::KeyValuePairs access_token_resp_data = OAuth::ParseKeyValuePairs(m_access_token_Response); OAuth::Token access_token = OAuth::Token::extract( access_token_resp_data ); OAuth::Client oauth = OAuth::Client(&amp;consumer, &amp;access_token); string oAuthQueryString = oauth.getURLQueryString( OAuth::Http::Post, m_upload_url); string upload_Request = (string(m_upload_url) + string("?") + oAuthQueryString); CURL *curl; CURLcode res; struct curl_httppost *formpost=NULL; struct curl_httppost *lastptr=NULL; struct curl_slist *headerlist=NULL; static const char buf[] = "Expect:"; curl_global_init(CURL_GLOBAL_ALL); /* Fill in the file upload field */ curl_formadd(&amp;formpost, &amp;lastptr, CURLFORM_COPYNAME, "file", CURLFORM_FILE, "C:/Users/Desktop/textfile.txt", CURLFORM_END); /* Fill in the filename field */ curl_formadd(&amp;formpost, &amp;lastptr, CURLFORM_COPYNAME, "name", CURLFORM_COPYCONTENTS, "textfile", CURLFORM_END); /* Fill in the submit field too, even if this is rarely needed */ curl_formadd(&amp;formpost, &amp;lastptr, CURLFORM_COPYNAME, "submit", CURLFORM_COPYCONTENTS, "send", CURLFORM_END); curl = curl_easy_init(); /* initalize custom header list (stating that Expect: 100-continue is not wanted */ headerlist = curl_slist_append(headerlist, buf); if(curl) { /* what URL that receives this POST */ curl_easy_setopt(curl, CURLOPT_URL, upload_Request.c_str()); /* only disable 100-continue header if explicitly requested */ curl_easy_setopt(curl, CURLOPT_HTTPPOST, 1L); curl_easy_setopt(curl, CURLOPT_POST, 1L); curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist); curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost); curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L); curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L); curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writeFunction); curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); /* Perform the request, res will get the return code */ res = curl_easy_perform(curl); string response = string(gData); qDebug() &lt;&lt; QString::fromStdString(response); /* Check for errors */ if(res != CURLE_OK) qDebug() &lt;&lt; "curl_easy_perform() failed: %s\n" &lt;&lt; curl_easy_strerror(res); /* always cleanup */ curl_easy_cleanup(curl); /* then cleanup the formpost chain */ curl_formfree(formpost); /* free slist */ curl_slist_free_all (headerlist); } </code></pre> <p>and here is the writeFunction:</p> <pre><code>char gData[1024*1024]; unsigned int gDataLen = 0; size_t writeFunction( char *ptr, size_t size, size_t nmemb) { memcpy( &amp;( gData[gDataLen] ), ptr, (size * nmemb) ); gDataLen += (size * nmemb); gData[ gDataLen ] = '\0'; return (size * nmemb); } </code></pre> <p>Any ideas, please?</p> <p>EDIT:</p> <p>Here is the request that the present code produces: <a href="https://api-content.dropbox.com/1/files/sandbox/?oauth_consumer_key=xxxxxxxxxxxxxxx&amp;oauth_nonce=13xxxxxx83cf&amp;oauth_signature=xxxxxx%xxxxxxxxxxxxxxxxxx%xxxxx%xx&amp;oauth_signature_method=HMAC-SHA1&amp;oauth_timestamp=1371107283&amp;oauth_token=xxxxxxxxxxxxxxx&amp;oauth_version=1.0" rel="nofollow">https://api-content.dropbox.com/1/files/sandbox/?oauth_consumer_key=xxxxxxxxxxxxxxx&amp;oauth_nonce=13xxxxxx83cf&amp;oauth_signature=xxxxxx%xxxxxxxxxxxxxxxxxx%xxxxx%xx&amp;oauth_signature_method=HMAC-SHA1&amp;oauth_timestamp=1371107283&amp;oauth_token=xxxxxxxxxxxxxxx&amp;oauth_version=1.0</a></p> <p>and the request that I produse with the plaintext method: <a href="https://api-content.dropbox.com/1/files/sandbox/?oauth_version=1.0&amp;oauth_signature_method=PLAINTEXT&amp;oauth_consumer_key=xxxxxxxxxxxxxxx&amp;oauth_token=xxxxxxxxxxxxxxx&amp;oauth_signature=xxxxxxxxxxxxxxx&amp;xxxxxxxxxxxxxxx" rel="nofollow">https://api-content.dropbox.com/1/files/sandbox/?oauth_version=1.0&amp;oauth_signature_method=PLAINTEXT&amp;oauth_consumer_key=xxxxxxxxxxxxxxx&amp;oauth_token=xxxxxxxxxxxxxxx&amp;oauth_signature=xxxxxxxxxxxxxxx&amp;xxxxxxxxxxxxxxx</a></p> <p>Response that O get in both cases: {"error": "Invalid signature."}</p>
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