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<?php
namespace BackblazeB2;
use BackblazeB2\Exceptions\B2Exception;
use BackblazeB2\Exceptions\NotFoundException;
use BackblazeB2\Exceptions\ValidationException;
use BackblazeB2\Http\Client as HttpClient;
use Carbon\Carbon;
use GuzzleHttp\Exception\GuzzleException;
class Client
{
const B2_API_BASE_URL = 'https://api.backblazeb2.com';
const B2_API_V1 = '/b2api/v1/';
protected $accountId;
protected $applicationKey;
protected $authToken;
protected $apiUrl;
protected $downloadUrl;
protected $client;
protected $reAuthTime;
protected $authTimeoutSeconds;
/**
* Accepts the account ID, application key and an optional array of options.
*
* @param $accountId
* @param $applicationKey
* @param array $options
*
* @throws \Exception
*/
public function __construct($accountId, $applicationKey, array $options = [])
{
$this->accountId = $accountId;
$this->applicationKey = $applicationKey;
$this->authTimeoutSeconds = 12 * 60 * 60; // 12 hour default
if (isset($options['auth_timeout_seconds'])) {
$this->authTimeoutSeconds = $options['auth_timeout_seconds'];
}
// set reauthorize time to force an authentication to take place
$this->reAuthTime = Carbon::now('UTC')->subSeconds($this->authTimeoutSeconds * 2);
$this->client = new HttpClient(['exceptions' => false]);
if (isset($options['client'])) {
$this->client = $options['client'];
}
}
/**
* Create a bucket with the given name and type.
*
* @param array $options
*
* @throws ValidationException
* @throws GuzzleException If the request fails.
* @throws B2Exception If the B2 server replies with an error.
*
* @return Bucket
*/
public function createBucket(array $options)
{
if (!in_array($options['BucketType'], [Bucket::TYPE_PUBLIC, Bucket::TYPE_PRIVATE])) {
throw new ValidationException(
sprintf('Bucket type must be %s or %s', Bucket::TYPE_PRIVATE, Bucket::TYPE_PUBLIC)
);
}
$response = $this->sendAuthorizedRequest('POST', 'b2_create_bucket', [
'accountId' => $this->accountId,
'bucketName' => $options['BucketName'],
'bucketType' => $options['BucketType'],
]);
return new Bucket($response['bucketId'], $response['bucketName'], $response['bucketType']);
}
/**
* Updates the type attribute of a bucket by the given ID.
*
* @param array $options
*
* @throws ValidationException
* @throws GuzzleException If the request fails.
* @throws B2Exception If the B2 server replies with an error.
*
* @return Bucket
*/
public function updateBucket(array $options)
{
if (!in_array($options['BucketType'], [Bucket::TYPE_PUBLIC, Bucket::TYPE_PRIVATE])) {
throw new ValidationException(
sprintf('Bucket type must be %s or %s', Bucket::TYPE_PRIVATE, Bucket::TYPE_PUBLIC)
);
}
if (!isset($options['BucketId']) && isset($options['BucketName'])) {
$options['BucketId'] = $this->getBucketIdFromName($options['BucketName']);
}
$response = $this->sendAuthorizedRequest('POST', 'b2_update_bucket', [
'accountId' => $this->accountId,
'bucketId' => $options['BucketId'],
'bucketType' => $options['BucketType'],
]);
return new Bucket($response['bucketId'], $response['bucketName'], $response['bucketType']);
}
/**
* Returns a list of bucket objects representing the buckets on the account.
*
* @throws GuzzleException If the request fails.
* @throws B2Exception If the B2 server replies with an error.
*
* @return array
*/
public function listBuckets()
{
$buckets = [];
$response = $this->sendAuthorizedRequest('POST', 'b2_list_buckets', [
'accountId' => $this->accountId,
]);
foreach ($response['buckets'] as $bucket) {
$buckets[] = new Bucket($bucket['bucketId'], $bucket['bucketName'], $bucket['bucketType']);
}
return $buckets;
}
/**
* Deletes the bucket identified by its ID.
*
* @param array $options
*
* @throws GuzzleException If the request fails.
* @throws B2Exception If the B2 server replies with an error.
*
* @return bool
*/
public function deleteBucket(array $options)
{
if (!isset($options['BucketId']) && isset($options['BucketName'])) {
$options['BucketId'] = $this->getBucketIdFromName($options['BucketName']);
}
$this->sendAuthorizedRequest('POST', 'b2_delete_bucket', [
'accountId' => $this->accountId,
'bucketId' => $options['BucketId'],
]);
return true;
}
/**
* Uploads a file to a bucket and returns a File object.
*
* @param array $options
*
* @throws GuzzleException If the request fails.
* @throws B2Exception If the B2 server replies with an error.
*
* @return File
*/
public function upload(array $options)
{
// Clean the path if it starts with /.
if (substr($options['FileName'], 0, 1) === '/') {
$options['FileName'] = ltrim($options['FileName'], '/');
}
if (!isset($options['BucketId']) && isset($options['BucketName'])) {
$options['BucketId'] = $this->getBucketIdFromName($options['BucketName']);
}
// Retrieve the URL that we should be uploading to.
$response = $this->sendAuthorizedRequest('POST', 'b2_get_upload_url', [
'bucketId' => $options['BucketId'],
]);
$uploadEndpoint = $response['uploadUrl'];
$uploadAuthToken = $response['authorizationToken'];
if (is_resource($options['Body'])) {
// We need to calculate the file's hash incrementally from the stream.
$context = hash_init('sha1');
hash_update_stream($context, $options['Body']);
$hash = hash_final($context);
// Similarly, we have to use fstat to get the size of the stream.
$size = fstat($options['Body'])['size'];
// Rewind the stream before passing it to the HTTP client.
rewind($options['Body']);
} else {
// We've been given a simple string body, it's super simple to calculate the hash and size.
$hash = sha1($options['Body']);
$size = strlen($options['Body']);
}
if (!isset($options['FileLastModified'])) {
$options['FileLastModified'] = round(microtime(true) * 1000);
}
if (!isset($options['FileContentType'])) {
$options['FileContentType'] = 'b2/x-auto';
}
$customHeaders = $options['Headers'] ?? [];
$response = $this->client->guzzleRequest('POST', $uploadEndpoint, [
'headers' => array_merge([
'Authorization' => $uploadAuthToken,
'Content-Type' => $options['FileContentType'],
'Content-Length' => $size,
'X-Bz-File-Name' => $options['FileName'],
'X-Bz-Content-Sha1' => $hash,
'X-Bz-Info-src_last_modified_millis' => $options['FileLastModified'],
], $customHeaders),
'body' => $options['Body'],
]);
return new File(
$response['fileId'],
$response['fileName'],
$response['contentSha1'],
$response['contentLength'],
$response['contentType'],
$response['fileInfo']
);
}
/**
* Download a file from a B2 bucket.
*
* @param array $options
*
* @return bool
*/
public function download(array $options)
{
if (!isset($options['FileId']) && !isset($options['BucketName']) && isset($options['BucketId'])) {
$options['BucketName'] = $this->getBucketNameFromId($options['BucketId']);
}
$this->authorizeAccount();
$requestUrl = null;
$customHeaders = $options['Headers'] ?? [];
$requestOptions = [
'headers' => array_merge([
'Authorization' => $this->authToken,
], $customHeaders),
'sink' => isset($options['SaveAs']) ? $options['SaveAs'] : null,
];
if (isset($options['FileId'])) {
$requestOptions['query'] = ['fileId' => $options['FileId']];
$requestUrl = $this->downloadUrl.'/b2api/v1/b2_download_file_by_id';
} else {
$requestUrl = sprintf('%s/file/%s/%s', $this->downloadUrl, $options['BucketName'], $options['FileName']);
}
$response = $this->client->guzzleRequest('GET', $requestUrl, $requestOptions, false);
return isset($options['SaveAs']) ? true : $response;
}
/**
* Copy a file.
*
* $options:
* required BucketName or BucketId the source bucket
* required FileName the file to copy
* required SaveAs the path and file name to save to
* optional DestinationBucketId or DestinationBucketName, the destination bucket
*
* @param array $options
*
* @throws B2Exception
* @throws GuzzleException
* @throws NotFoundException
*
* @return File
*/
public function copy(array $options)
{
$options['FileName'] = ltrim($options['FileName'], '/');
$options['SaveAs'] = ltrim($options['SaveAs'], '/');
if (!isset($options['DestinationBucketId']) && isset($options['DestinationBucketName'])) {
$options['DestinationBucketId'] = $this->getBucketIdFromName($options['DestinationBucketName']);
}
if (!isset($options['BucketId']) && isset($options['BucketName'])) {
$options['BucketId'] = $this->getBucketIdFromName($options['BucketName']);
}
$sourceFiles = $this->listFiles([
'BucketId' => $options['BucketId'],
'FileName' => $options['FileName'],
]);
$sourceFileId = !empty($sourceFiles) ? $sourceFiles[0]->getId() : false;
if (!$sourceFileId) {
throw new NotFoundException('Source file not found in B2');
}
$json = [
'sourceFileId' => $sourceFileId,
'fileName' => $options['SaveAs'],
];
if (isset($options['DestinationBucketId'])) {
$json['DestinationBucketId'] = $options['DestinationBucketId'];
}
$response = $this->sendAuthorizedRequest('POST', 'b2_copy_file', $json);
return new File(
$response['fileId'],
$response['fileName'],
$response['contentSha1'],
$response['contentLength'],
$response['contentType'],
$response['fileInfo'],
$response['bucketId'],
$response['action'],
$response['uploadTimestamp']
);
}
/**
* Retrieve a collection of File objects representing the files stored inside a bucket.
*
* @param array $options
*
* @throws GuzzleException If the request fails.
* @throws B2Exception If the B2 server replies with an error.
*
* @return array
*/
public function listFiles(array $options)
{
// if FileName is set, we only attempt to retrieve information about that single file.
$fileName = !empty($options['FileName']) ? $options['FileName'] : null;
$nextFileName = null;
$maxFileCount = 1000;
$prefix = isset($options['Prefix']) ? $options['Prefix'] : '';
$delimiter = isset($options['Delimiter']) ? $options['Delimiter'] : null;
$files = [];
if (!isset($options['BucketId']) && isset($options['BucketName'])) {
$options['BucketId'] = $this->getBucketIdFromName($options['BucketName']);
}
if ($fileName) {
$nextFileName = $fileName;
$maxFileCount = 1;
}
$this->authorizeAccount();
// B2 returns, at most, 1000 files per "page". Loop through the pages and compile an array of File objects.
while (true) {
$response = $this->sendAuthorizedRequest('POST', 'b2_list_file_names', [
'bucketId' => $options['BucketId'],
'startFileName' => $nextFileName,
'maxFileCount' => $maxFileCount,
'prefix' => $prefix,
'delimiter' => $delimiter,
]);
foreach ($response['files'] as $file) {
// if we have a file name set, only retrieve information if the file name matches
if (!$fileName || ($fileName === $file['fileName'])) {
$files[] = new File($file['fileId'], $file['fileName'], null, $file['size']);
}
}
if ($fileName || $response['nextFileName'] === null) {
// We've got all the files - break out of loop.
break;
}
$nextFileName = $response['nextFileName'];
}
return $files;
}
/**
* Test whether a file exists in B2 for the given bucket.
*
* @param array $options
*
* @return bool
*/
public function fileExists(array $options)
{
$files = $this->listFiles($options);
return !empty($files);
}
/**
* Returns a single File object representing a file stored on B2.
*
* @param array $options
*
* @throws GuzzleException
* @throws NotFoundException If no file id was provided and BucketName + FileName does not resolve to a file, a NotFoundException is thrown.
* @throws GuzzleException If the request fails.
* @throws B2Exception If the B2 server replies with an error.
*
* @return File
*/
public function getFile(array $options)
{
if (!isset($options['FileId']) && isset($options['BucketId']) && isset($options['FileName'])) {
$files = $this->listFiles([
'BucketId' => $options['BucketId'],
'FileName' => $options['FileName'],
]);
if (empty($files)) {
throw new NotFoundException();
}
$options['FileId'] = $files[0]->getId();
} elseif (!isset($options['FileId']) && isset($options['BucketName']) && isset($options['FileName'])) {
$options['FileId'] = $this->getFileIdFromBucketAndFileName($options['BucketName'], $options['FileName']);
if (!$options['FileId']) {
throw new NotFoundException();
}
}
$response = $this->sendAuthorizedRequest('POST', 'b2_get_file_info', [
'fileId' => $options['FileId'],
]);
return new File(
$response['fileId'],
$response['fileName'],
$response['contentSha1'],
$response['contentLength'],
$response['contentType'],
$response['fileInfo'],
$response['bucketId'],
$response['action'],
$response['uploadTimestamp']
);
}
/**
* Deletes the file identified by ID from Backblaze B2.
*
* @param array $options
*
* @throws GuzzleException
* @throws NotFoundException
* @throws GuzzleException If the request fails.
* @throws B2Exception If the B2 server replies with an error.
*
* @return bool
*/
public function deleteFile(array $options)
{
if (!isset($options['FileName'])) {
$file = $this->getFile($options);
$options['FileName'] = $file->getName();
}
if (!isset($options['FileId']) && isset($options['BucketName']) && isset($options['FileName'])) {
$file = $this->getFile($options);
$options['FileId'] = $file->getId();
}
$this->sendAuthorizedRequest('POST', 'b2_delete_file_version', [
'fileName' => $options['FileName'],
'fileId' => $options['FileId'],
]);
return true;
}
/**
* Fetches authorization and uri for a file, to allow a third-party system to download public and private files.
*
* @param array $options
*
* @throws GuzzleException
* @throws NotFoundException
* @throws GuzzleException If the request fails.
* @throws B2Exception If the B2 server replies with an error.
*
* @return array
*/
public function getFileUri(array $options)
{
if (!isset($options['FileId']) && !isset($options['BucketName']) && isset($options['BucketId'])) {
$options['BucketName'] = $this->getBucketNameFromId($options['BucketId']);
}
$this->authorizeAccount();
if (isset($options['FileId'])) {
$requestUri = $this->downloadUrl.'/b2api/v1/b2_download_file_by_id?fileId='.urlencode($options['FileId']);
} else {
$requestUri = sprintf('%s/file/%s/%s', $this->downloadUrl, $options['BucketName'], $options['FileName']);
}
return [
'Authorization' => $this->authToken,
'Uri' => $requestUri,
];
}
/**
* Authorize the B2 account in order to get an auth token and API/download URLs.
*/
protected function authorizeAccount()
{
if (Carbon::now('UTC')->timestamp < $this->reAuthTime->timestamp) {
return;
}
$response = $this->client->guzzleRequest('GET', self::B2_API_BASE_URL.self::B2_API_V1.'/b2_authorize_account', [
'auth' => [$this->accountId, $this->applicationKey],
]);
$this->authToken = $response['authorizationToken'];
$this->apiUrl = $response['apiUrl'].self::B2_API_V1;
$this->downloadUrl = $response['downloadUrl'];
$this->reAuthTime = Carbon::now('UTC');
$this->reAuthTime->addSeconds($this->authTimeoutSeconds);
}
/**
* Maps the provided bucket name to the appropriate bucket ID.
*
* @param $name
*
* @return mixed
*/
protected function getBucketIdFromName($name)
{
$buckets = $this->listBuckets();
foreach ($buckets as $bucket) {
if ($bucket->getName() === $name) {
return $bucket->getId();
}
}
}
/**
* Maps the provided bucket ID to the appropriate bucket name.
*
* @param $id
*
* @return mixed
*/
protected function getBucketNameFromId($id)
{
$buckets = $this->listBuckets();
foreach ($buckets as $bucket) {
if ($bucket->getId() === $id) {
return $bucket->getName();
}
}
}
/**
* @param $bucketName
* @param $fileName
*
* @return mixed
*/
protected function getFileIdFromBucketAndFileName($bucketName, $fileName)
{
$files = $this->listFiles([
'BucketName' => $bucketName,
'FileName' => $fileName,
]);
foreach ($files as $file) {
if ($file->getName() === $fileName) {
return $file->getId();
}
}
}
/**
* Uploads a large file using b2 large file procedure.
*
* @param array $options
*
* @return File
*/
public function uploadLargeFile(array $options)
{
if (substr($options['FileName'], 0, 1) === '/') {
$options['FileName'] = ltrim($options['FileName'], '/');
}
//if last char of path is not a "/" then add a "/"
if (substr($options['FilePath'], -1) != '/') {
$options['FilePath'] = $options['FilePath'].'/';
}
if (!isset($options['BucketId']) && isset($options['BucketName'])) {
$options['BucketId'] = $this->getBucketIdFromName($options['BucketName']);
}
if (!isset($options['FileContentType'])) {
$options['FileContentType'] = 'b2/x-auto';
}
$this->authorizeAccount();
// 1) b2_start_large_file, (returns fileId)
$start = $this->startLargeFile($options['FileName'], $options['FileContentType'], $options['BucketId']);
// 2) b2_get_upload_part_url for each thread uploading (takes fileId)
$url = $this->getUploadPartUrl($start['fileId']);
// 3) b2_upload_part for each part of the file
$parts = $this->uploadParts($options['FilePath'].$options['FileName'], $url['uploadUrl'], $url['authorizationToken'], $options);
$sha1s = [];
foreach ($parts as $part) {
$sha1s[] = $part['contentSha1'];
}
// 4) b2_finish_large_file.
return $this->finishLargeFile($start['fileId'], $sha1s);
}
/**
* Starts the large file upload process.
*
* @param $fileName
* @param $contentType
* @param $bucketId
*
* @throws GuzzleException If the request fails.
* @throws B2Exception If the B2 server replies with an error.
*
* @return mixed
*/
protected function startLargeFile($fileName, $contentType, $bucketId)
{
return $this->sendAuthorizedRequest('POST', 'b2_start_large_file', [
'fileName' => $fileName,
'contentType' => $contentType,
'bucketId' => $bucketId,
]);
}
/**
* Gets the url for the next large file part upload.
*
* @param $fileId
*
* @throws GuzzleException If the request fails.
* @throws B2Exception If the B2 server replies with an error.
*
* @return mixed
*/
protected function getUploadPartUrl($fileId)
{
return $this->sendAuthorizedRequest('POST', 'b2_get_upload_part_url', [
'fileId' => $fileId,
]);
}
/**
* Uploads the file as "parts" of 100MB each.
*
* @param $filePath
* @param $uploadUrl
* @param $largeFileAuthToken
* @param $options
*
* @return array
*/
protected function uploadParts($filePath, $uploadUrl, $largeFileAuthToken, $options = [])
{
$return = [];
$minimum_part_size = 100 * (1000 * 1000);
$local_file_size = filesize($filePath);
$total_bytes_sent = 0;
$bytes_sent_for_part = $minimum_part_size;
$sha1_of_parts = [];
$part_no = 1;
$file_handle = fopen($filePath, 'r');
while ($total_bytes_sent < $local_file_size) {
// Determine the number of bytes to send based on the minimum part size
if (($local_file_size - $total_bytes_sent) < $minimum_part_size) {
$bytes_sent_for_part = ($local_file_size - $total_bytes_sent);
}
// Get a sha1 of the part we are going to send
fseek($file_handle, $total_bytes_sent);
$data_part = fread($file_handle, $bytes_sent_for_part);
array_push($sha1_of_parts, sha1($data_part));
fseek($file_handle, $total_bytes_sent);
$customHeaders = $options['Headers'] ?? [];
$response = $this->client->guzzleRequest('POST', $uploadUrl, [
'headers' => array_merge([
'Authorization' => $largeFileAuthToken,
'Content-Length' => $bytes_sent_for_part,
'X-Bz-Part-Number' => $part_no,
'X-Bz-Content-Sha1' => $sha1_of_parts[$part_no - 1],
], $customHeaders),
'body' => $data_part,
]);
$return[] = $response;
// Prepare for the next iteration of the loop
$part_no++;
$total_bytes_sent = $bytes_sent_for_part + $total_bytes_sent;
}
fclose($file_handle);
return $return;
}
/**
* Finishes the large file upload procedure.
*
* @param $fileId
* @param array $sha1s
*
* @throws GuzzleException If the request fails.
* @throws B2Exception If the B2 server replies with an error.
*
* @return File
*/
protected function finishLargeFile($fileId, array $sha1s)
{
$response = $this->sendAuthorizedRequest('POST', 'b2_finish_large_file', [
'fileId' => $fileId,
'partSha1Array' => $sha1s,
]);
return new File(
$response['fileId'],
$response['fileName'],
$response['contentSha1'],
$response['contentLength'],
$response['contentType'],
$response['fileInfo'],
$response['bucketId'],
$response['action'],
$response['uploadTimestamp']
);
}
/**
* Sends a authorized request to b2 API.
*
* @param string $method
* @param string $route
* @param array $json
*
* @throws GuzzleException If the request fails.
* @throws B2Exception If the B2 server replies with an error.
*
* @return mixed
*/
protected function sendAuthorizedRequest($method, $route, $json = [])
{
$this->authorizeAccount();
return $this->client->guzzleRequest($method, $this->apiUrl.$route, [
'headers' => [
'Authorization' => $this->authToken,
],
'json' => $json,
]);
}
}