Backblaze B2 API for Symfony

📼 Backblaze B2 API client services for Symfony projects

Installation

To install this bundle, run the following in your Symfony project directory:

$ composer require steppinghat/backblaze-b2-bundle

Then register the bundle in config/bundles.php

<?php

return [
    // ...
    SteppingHat\BackblazeB2\BackblazeB2Bundle::class => ['all' => true]
]

And lastly, create a config file in config/packages called backblaze_b2.yaml

backblaze_b2:
  account_id: '%env(BACKBLAZE_MASTER_ACCOUNT_ID)%'
  application_id: '%env(BACKBLAZE_MASTER_APPLICATION_ID)%'
  application_secret: '%env(BACKBLAZE_MASTER_APPLICATION_KEY)%'
  token_cache_directory: ~

Configuration

Backblaze API keys

Before setting off, you'll need to create a key by going to App Keys in your Backblaze Account.

Not all keys are created equal!

You can use an application key, however the capabilities are very limited in comparison to the master application key. Please bare this in mind when configuring the bundle.

Caching Tokens

In order to both reduce the number of API calls made, and speed up the overall turnaround time, we can optionally cache tokens to disk. This means that instead of requesting the authentication token needed to carry out requests every time, we use one from an earlier call that we've cached. These tokens last ~12 hours before they expire and a new one is needed.

While is can be preferable, some might not like the idea of keeping a token saved to disk for security reasons. If your system is well secured and this isn't as much of a risk, turn this on by setting tokenCacheDirectory to a valid directory in that we have permissions to write to.

This cache is not cleared by running php bin/console cache:clear

Usage

For all basic usage of the API, simply use the BackblazeClient class in your service.

<?php

use SteppingHat\BackblazeB2\Client\BackblazeClient;

class ExampleService {

    protected BackblazeClient $client;

    public function __construct(BackblazeClient $client) {
        $this->client = $client;    
    }
    
}

• Create a bucket
• List all buckets
• Update a bucket
• Delete a bucket
• List all files
• Check if a file exists
• Get file info
• Delete a file
• Upload a file
• Download a file

Create a bucket

Requires the writeBuckets capability

$bucket = $client->createBucket('bucketName', Bucket::TYPE_PRIVATE);

List all buckets

Requires the listBuckets capability

$buckets = $client->listBuckets();

Update a bucket

Requires the writeBuckets capability

$bucket = $client->updateBucket($bucket, Bucket::TYPE_PUBLIC);

Delete a bucket

Requires the deleteBuckets capability

$client->deleteBucket($bucket);

List all files

Requires the listFiles capability

// List all files across all buckets
$files = $client->listFiles();

// List all files in a specific bucket
$files = $client->listFiles($bucket);

// Search for a specific file
$files = $client->listFiles($bucket, 'animals/dogs/floof.png');

// Search for all files matching a prefix
$files = $client->listFiles($bucket, null, 'animals/dogs/');

Check if a file exists

Requires the listFiles capability

if($client->fileExists($bucket, 'animals/dogs/doggo.jpg')) {
    // ...
}

Get file info

Requires the readFiles capability

$file = $client->getFileInfo($file);
// or
$file = $client->getFileInfoById($fileId);

Delete a file

Requires the deleteFiles capability

$client->deleteFile($file);

If a file has governance restrictions, access keys with the bypassGovernance capability can force delete files.

$client->deleteFile($file, true);

Upload a file

Requires the writeFiles capability

Files can be uploaded by either passing a string content

$fileContent = 'Hello world!';
// or
$fileContent = file_get_contents('hello.txt');
$client->upload($bucket, $fileContent, 'files/hello.txt');

or files can be passed in as a resource

$file = fopen('smoldoggo.png', 'r');
$client->upload($bucket, $file, 'animals/dogs/smoldoggo.png');

⚠ Resource content is loaded into memory before being sent. This is due to a limitation where the Symfony HttpClient library sends headers after the content, and the Backblaze API expects it before. As a result, we can't directly pass the resource directly to Backblaze. This is currently a //TODO to find a workaround for. If you intend to upload large files, this may be an issue.

Download a file

Requires the readFiles capability

Downloaded content is simply returned into a variable

$content = $client->download($file);
echo $file;
// Hello world!

but can also be passed directly into a resource

$resource = fwrite('/tmp/smoldoggo.png', 'w');
$client->download($file, $resource);
fclose($resource);

Testing

In terms of tests, there are no tests. (Boooo).

This library is still a work in progress as I don't yet fully support the B2 API, nor have I ironed out 100% of the kinks (see uploading a resource for example).

Most of the functionality works (I use it in my own app), I guess you can call that some sort of guarantee?

But don't worry, once I've built out the library some more there will be tests - I promise!

License

Made with ❤️ by Javan Eskander

Available for use under the MIT license.