Posting form data to Amazon S3 bucket

Question 1

I’ve spent three days now trying to set up a simple posting form to amazon s3.
Everytime I get this error:

SignatureDoesNotMatchThe request signature we calculated does not
match the signature you provided. Check your key and signing method.

I don’t see the problem. 🙁

<?php
        $form = array(
            'key'                       => 'queue/1_1_1234567890.wmv',
            'AWSAccessKeyId'            => 'mypublickeyishere',
            'acl'                       => 'public-read',
            'success_action_redirect'   => 'http://someurl.com',
        );

        $form['policy'] = '{
            "expiration": "2015-12-01T12:00:00.000Z",
                "conditions": [
                    {
                        "acl": "'.$form['acl'].'"
                    },
                    {
                        "success_action_redirect": "'.$form['success_action_redirect'].'"
                    },
                    {
                        "bucket": "thenameofmybucket"
                    },
                    [
                        "starts-with",
                        "$key",
                        "queue/"
                    ]
                ]
            }';

    $form['policy_encoded'] = base64_encode($form['policy']);
    $form['signature'] = base64_encode(hash_hmac( 'sha1', base64_encode(utf8_encode($form['policy'])), 'F90mc5kpjuNMPg8XG7iV6bxOzacYhktcw+RVGzpZ'));

?>


<form action="https://thenameofmybucket.s3.amazonaws.com/" method="post" enctype="multipart/form-data">
      <input type="hidden" name="key" value="<?php echo $form['key'] ?>">
      <input type="hidden" name="AWSAccessKeyId" value="<?php echo $form['AWSAccessKeyId'] ?>">
      <input type="hidden" name="acl" value="<?php echo $form['acl'] ?>">
      <input type="hidden" name="success_action_redirect" value="<?php echo $form['success_action_redirect'] ?>">
      <input type="hidden" name="policy" value="<?php echo $form['policy_encoded'] ?>">
      <input type="hidden" name="signature" value="<?php echo $form['signature'] ?>">

      File to upload to S3:
      <input name="file" type="file">
      <br>
      <input type="submit" value="Upload File to S3">
</form>

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$form = array(

'key' => 'queue/1_1_1234567890.wmv',

'AWSAccessKeyId' => 'mypublickeyishere',

'acl' => 'public-read',

'success_action_redirect' => 'http://someurl.com',

);

$form['policy'] = '{

"expiration": "2015-12-01T12:00:00.000Z",

"conditions": [

{

"acl": "'.$form['acl'].'"

},

{

"success_action_redirect": "'.$form['success_action_redirect'].'"

},

{

"bucket": "thenameofmybucket"

},

[

"starts-with",

"$key",

"queue/"

]

}';

$form['policy_encoded'] = base64_encode($form['policy']);

$form['signature'] = base64_encode(hash_hmac( 'sha1', base64_encode(utf8_encode($form['policy'])), 'F90mc5kpjuNMPg8XG7iV6bxOzacYhktcw+RVGzpZ'));

?>

File to upload to S3:

I substituted the bucket name as well as the private and public keys above.

I followed the instruction to sign the policy meticulously:
http://docs.amazonwebservices.com/AmazonS3/2006-03-01/dev/HTTPPOSTForms.html#HTTPPOSTConstructPolicy

What am I missing? Why is the code not working?

Question 2

Okay, I finally managed to get this done using this sample code library:
http://aws.amazon.com/code/Amazon-S3/1618

Posting form data to Amazon S3 bucket

Question:

Answer:

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