How to post image on twitter in Phonegap using javascript

Question

I\'m currently implementing a web smartphone application with Phonegap. On this application, users can post images they take with the phone camera on Facebook. This feature has

Answer 1

According to the docs, Twitter requires the multipart/form-data enctype, which means a base64 string isn't going to work.

Unlike POST statuses/update, this method expects raw multipart data. Your POST request's Content-Type should be set to multipart/form-data with the media[] parameter ~ https://dev.twitter.com/docs/api/1/post/statuses/update_with_media

However, you could host an endpoint that takes base64, converts it to a real file, and forwards the request to Twitter. For example (untested):

<?php

$base64 = $_POST['image'];
$data = base64_decode( $base64 );

// Make name unique to avoid conflicts.
$temp_file = uniqid() . $_POST['name'];

// Save the file to a temp location.
file_put_contents( $temp_file, $data );

$temp_info = pathinfo( $temp_file );
$temp_type = $temp_info['extension'];
$temp_name = basename( $temp_file, '.' . $temp_type );

// OAuth library recommended by Twitter: https://github.com/themattharris/tmhOAuth
// See original: https://github.com/themattharris/tmhOAuth-examples/blob/master/images.php

require 'tmhOAuth.php';
require 'tmhUtilities.php';

$tmhOAuth = new tmhOAuth( array(
    'consumer_key'    => $_POST['consumer_key'],
    'consumer_secret' => $_POST['consumer_secret'],
    'user_token'      => $_POST['user_token'],
    'user_secret'     => $_POST['user_secret'],
));

// note the type and filename are set here as well
// Edit: Not sure if the `type` and `filename` params are necessary.
$params = array( 'media[]' => "@{$temp_file};type={$temp_type};filename={$temp_name}" );

$code = $tmhOAuth->request( 'POST', $tmhOAuth->url( '1/status/update_with_media' ),
    $params,
    true, // use auth
    true  // multipart
);

// Remove temp file.
unlink( $temp_file );

if ( $code == 200 ) {
    tmhUtilities::pr( json_decode( $tmhOAuth->response['response'] ) );
}
tmhUtilities::pr( htmlentities( $tmhOAuth->response['response'] ) );

?>

And you might call it like:

    $.ajax({
        // You'll want to use https to protect the oauth info.
        url: "https://mysite.com/proxy.php",
        type: "POST",
        data: {
            image: "base64 data...",
            name: "foo.png",
            consumer_key: options.consumerKey,
            consumer_secret: options.consumerSecret,
            user_token: options.accessTokenKey,
            user_secret: options.accessTokenSecret
        },
        success: function( data ) {
            console.log( data );
        }
    });

Answer 2

For anyone trying to post images to Twitter using client JS, I was able to post to twitter using the solution by gary-buynary-co-za (https://github.com/bytespider/jsOAuth/pull/11) at the end of this forum. Pretty much ended up using Phonegap FileTransfer and FileTransferOptions objects for transferring image to twitter api, but used jsOAuth for preparing FileTransferOptions headers and signatures. The solution could definitely be cleaned up though.