Amazon S3 SDK PHP doesObjectExist() problems

Question

I've re-written this question to make it clearer, since I've updated it.

I'm having trouble with the Amazon AWS S3 PHP SDK. I'm just trying to check if a file exists. Using this PHP script:

<?php
    require_once("../../../configs/config.".get_current_user().".php");
    require INCLUDES_PATH . 'libraries/aws/aws-autoloader.php';

    use Aws\S3\S3Client;

    $client = S3Client::factory(array(
          'key' => AWS_ACCESS_KEY_ID,
          'secret' => AWS_SECRET_KEY
      ));

    $key = 'profile/avatar/80745d03-c295-4205-bd82-58161f2fd2d1-320.jpg';
    $result = $client->doesObjectExist( AWS_S3_BUCKET, $key );

    var_dump(AWS_S3_BUCKET);
    var_dump($key);
    var_dump($result);

?>

This is the output:

string(19) "stage.socialite.app"
string(59) "profile/avatar/80745d03-c295-4205-bd82-58161f2fd2d1-320.jpg"
bool(false)

I know the file exists, it's here:

http://stage.socialite.app.s3.amazonaws.com/profile/avatar/80745d03-c295-4205-bd82-58161f2fd2d1-320.jpg

This is the IAM policy for the user, whose Key ID and Secret Key I'm using:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
          "s3:*"
      ],
      "Resource": [
        "arn:aws:s3:::stage.socialite.app/*",
        "arn:aws:s3:::stage.socialite.app"
      ]
    }
  ]
}

I've just created a new Key/Secret pair and added them to my config - what have I done wrong?

Jeremy Lindblom · Accepted Answer · 2014-04-02 20:13:42Z

8

If var_dump() says bool(false) or bool(true), then it is correctly returning a boolean value. print_r() does not include detailed type information and returns an empty string for false and null values.

So does the object actually exist? Things to check on:

S3 keys do not have a leading slashes. According to your code and output above, I suspect this is the problem.
Make sure you are providing the actual S3 bucket name and not the CloudFront distribution name.
doesObjectExist() returns false if the user does not have read permissions for that object.

answered Apr 2, 2014 at 20:13

Jeremy Lindblom

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2 Comments

Pete Over a year ago

I added the leading slash as it wasn't working without, I'll remove it and update the top question, and double check that's not the problem - I suspect then it might be the permissions problem.

mathielo Over a year ago

For me the problem was the leading slash, removing it solved it!

Community · Accepted Answer · 2017-05-23 12:17:31Z

3

I found the answer on another SO post, in a comment from Carlos Castillo:

AWS PHP SDK Version 2 S3 filename encoding issue

He pointed me in the direction of a Github Issue that suggested setting the region when initializing the S3 client, this is because I'm using an S3 instance in Ireland for my dev server, not the default US servers.

So this is the solution:

$client = S3Client::factory(array(
    'key' => AWS_ACCESS_KEY_ID,
    'secret' => AWS_SECRET_KEY,
    'region' => AWS_S3_REGION
));

Where AWS_S3_REGION is a constant set in my config file, like the Key and Secret.

Credit goes to neilscastle, Carlos and Stack Overflow for it's excellent SEO

edited May 23, 2017 at 12:17

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answered Apr 6, 2014 at 13:45

Pete

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2 Comments

Jeremy Lindblom Over a year ago

Ah, the bucket location being the problem makes sense.

Throttlehead Over a year ago

As a side note you can pass @region into the opts for the call to doesObjectExist itself, which often makes the most sense if you have some sort of reverse lookup function like we do for processing s3 files inter-regionally ie getRegionFromBucket().

fsimon · Accepted Answer · 2015-04-12 08:51:22Z

3

In addition to correct bucket location and read permissions:

If using server-side encryption you need to provide the SSE options with doesObjectExist.

$s3Client->doesObjectExist($bucket, $key, array(
    'SSECustomerAlgorithm' => 'AES256',
    'SSECustomerKey'       => $encryptionKey,
    'SSECustomerKeyMD5'    => md5($encryptionKey, true)
));

Missing or incorrect SSE options will yield false return from doesObjectExist.

answered Apr 12, 2015 at 8:51

fsimon

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