app/Album.php

@@ -2,6 +2,7 @@
 
 namespace App;
 
+use App\AlbumSources\AlbumSourceBase;
 use App\AlbumSources\IAlbumSource;
 use App\AlbumSources\LocalFilesystemSource;
 use App\Helpers\MiscHelper;
@@ -158,10 +159,7 @@ class Album extends Model
      */
     public function getAlbumSource()
     {
-        $fullClassName = sprintf('App\AlbumSources\%s', $this->storage->source);
-
-        /** @var IAlbumSource $source */
-        $source = new $fullClassName;
+        $source = AlbumSourceBase::make($this->storage->source);
         $source->setAlbum($this);
         $source->setConfiguration($this->storage);
 

app/AlbumSources/AlbumSourceBase.php

@@ -17,6 +17,31 @@ abstract class AlbumSourceBase
      */
     protected $configuration;
 
+    /**
+     * @var mixed
+     */
+    private static $albumSourceCache = [];
+
+    /**
+     * Makes an album source class for the given source name (relative class name.)
+     * @param string $sourceName Name of the source.
+     * @return IAlbumSource
+     */
+    public static function make($sourceName)
+    {
+        $fullClassName = sprintf('App\AlbumSources\%s', $sourceName);
+
+        if (!array_key_exists($fullClassName, self::$albumSourceCache))
+        {
+            /** @var IAlbumSource $source */
+            $source = app($fullClassName);
+
+            self::$albumSourceCache[$fullClassName] = $source;
+        }
+
+        return self::$albumSourceCache[$fullClassName];
+    }
+
     public function setAlbum(Album $album)
     {
         $this->album = $album;

app/AlbumSources/BackblazeB2Source.php

@@ -2,10 +2,12 @@
 
 namespace App\AlbumSources;
 
+use App\BackblazeB2FileIdCache;
 use App\Photo;
 use App\Services\BackblazeB2Service;
 use App\Storage;
 use Guzzle\Http\EntityBody;
+use Illuminate\Support\Facades\Log;
 
 class BackblazeB2Source extends AlbumSourceBase implements IAlbumSource
 {
@@ -36,7 +38,7 @@ class BackblazeB2Source extends AlbumSourceBase implements IAlbumSource
      */
     public function deleteAlbumContents()
     {
-        // TODO: Implement deleteAlbumContents() method.
+        // No need to do anything for the album container - once the files are gone, the virtual folder is also gone
     }
 
     /**
@@ -47,7 +49,21 @@ class BackblazeB2Source extends AlbumSourceBase implements IAlbumSource
      */
     public function deleteThumbnail(Photo $photo, $thumbnail = null)
     {
-        // TODO: Implement deleteThumbnail() method.
+        $pathOnStorage = $this->getPathToPhoto($photo, $thumbnail);
+
+        // Create or update our cache record
+
+        /** @var BackblazeB2FileIdCache $b2Cache */
+        $b2Cache = BackblazeB2FileIdCache::where('storage_path', $pathOnStorage)->first();
+        if (is_null($b2Cache))
+        {
+            // TODO: lookup the file on B2 to get the file ID
+            Log::warning(sprintf('B2 file ID not found in cache: %s', $pathOnStorage));
+            return;
+        }
+
+        $this->getClient()->deleteFile($b2Cache->b2_file_id, $pathOnStorage);
+        $b2Cache->delete();
     }
 
     /**
@@ -58,7 +74,14 @@ class BackblazeB2Source extends AlbumSourceBase implements IAlbumSource
      */
     public function fetchPhotoContent(Photo $photo, $thumbnail = null)
     {
-        // TODO: Implement fetchPhotoContent() method.
+        // Use the same URLs that the public would use to fetch the file
+        $urlToPhoto = $this->getUrlToPhoto($photo, $thumbnail);
+
+        $ch = curl_init($urlToPhoto);
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+        $fileContent = curl_exec($ch);
+
+        return EntityBody::fromString($fileContent);
     }
 
     /**
@@ -93,6 +116,7 @@ class BackblazeB2Source extends AlbumSourceBase implements IAlbumSource
         switch ($this->bucketType)
         {
             case self::BUCKET_TYPE_PRIVATE:
+                // TODO: use the B2 b2_download_file_by_id method so filenames are harder to guess
                 if (is_null($this->downloadToken))
                 {
                     $this->downloadToken = $client->getDownloadAuthToken();
@@ -116,7 +140,25 @@ class BackblazeB2Source extends AlbumSourceBase implements IAlbumSource
     {
         $pathOnStorage = $this->getPathToPhoto($photo, $thumbnail);
 
-        $this->getClient()->uploadFile($tempFilename, $pathOnStorage);
+        // Upload the file to B2
+        $b2FileID = $this->getClient()->uploadFile($tempFilename, $pathOnStorage);
+
+        // Create or update our cache record
+        $b2Cache = BackblazeB2FileIdCache::where('storage_path', $pathOnStorage)->first();
+        if (is_null($b2Cache))
+        {
+            $b2Cache = new BackblazeB2FileIdCache([
+                'photo_id' => $photo->id,
+                'storage_path' => $pathOnStorage,
+                'b2_file_id' => $b2FileID
+            ]);
+        }
+        else
+        {
+            $b2Cache->b2_file_id = $b2FileID;
+        }
+
+        $b2Cache->save();
     }
 
     public function setConfiguration(Storage $configuration)

app/BackblazeB2FileIdCache.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace App;
+
+use Illuminate\Database\Eloquent\Model;
+
+class BackblazeB2FileIdCache extends Model
+{
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = [
+        'photo_id',
+        'storage_path',
+        'b2_file_id'
+    ];
+}

app/Services/BackblazeB2Service.php

@@ -2,6 +2,8 @@
 
 namespace App\Services;
 
+use Illuminate\Support\Facades\Log;
+
 class BackblazeB2Service
 {
     /**
@@ -75,6 +77,35 @@ class BackblazeB2Service
         }
     }
 
+    public function deleteFile($fileID, $fileName)
+    {
+        $this->sendRequest(
+            sprintf('%s/b2api/v2/b2_delete_file_version', $this->accountApiUrl),
+            'POST',
+            [
+                'fileId' => $fileID,
+                'fileName' => $fileName
+            ]
+        );
+    }
+
+    public function downloadFile($fileID)
+    {
+        $downloadToken = $this->getDownloadAuthToken();
+
+        return $this->sendRequest(
+            sprintf('%s/b2api/v2/b2_download_file_by_id?fileId=%s', $this->accountApiUrl, urlencode($fileID), urlencode($downloadToken)),
+            'GET',
+            null,
+            [
+                'http_headers' => [
+                    sprintf('Authorization: %s', $downloadToken)
+                ],
+                'response_body_is_json' => false
+            ]
+        );
+    }
+
     public function getBucketType()
     {
         return $this->bucketType;
@@ -129,24 +160,24 @@ class BackblazeB2Service
         fclose($handle);
         $fileContentsSha1 = sha1_file($pathToFileToUpload);
 
-        $ch = $this->getBasicHttpClient($uploadUrl, 'POST', [
+        $httpHeaders = [
             sprintf('Authorization: %s', $authorizationToken),
             'Content-Type: b2/x-auto',
             sprintf('X-Bz-Content-Sha1: %s', $fileContentsSha1),
             sprintf('X-Bz-File-Name: %s', urlencode($pathToStorage))
-        ]);
+        ];
 
-        curl_setopt($ch, CURLOPT_POSTFIELDS, $fileContents);
+        $result = $this->sendRequest(
+            $uploadUrl,
+            'POST',
+            $fileContents,
+            [
+                'http_headers' => $httpHeaders,
+                'post_body_is_json' => false
+            ]
+        );
 
-        $result = curl_exec($ch);
-        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
-
-        if ($httpCode != 200 && $httpCode != 304)
-        {
-            throw new \Exception(sprintf('Exception from Backblaze B2: %s', $result));
-        }
-
-        curl_close($ch);
+        return $result->fileId;
     }
 
     private function getBucketDetailsFromName($bucketName)
@@ -206,31 +237,67 @@ class BackblazeB2Service
         return $ch;
     }
 
-    private function sendRequest($url, $method = 'GET', $postData = null)
+    private function sendRequest($url, $method = 'GET', $postData = null, array $postOptions = [])
     {
-        $httpHeaders = [];
+        $postOptions = array_merge(
+            [
+                'authorization_token' => null,
+                'http_headers' => [],
+                'post_body_is_json' => true,
+                'response_body_is_json' => true
+            ],
+            $postOptions
+        );
+        $httpHeaders = $postOptions['http_headers'];
 
-        if (is_null($this->authToken))
+        // Some methods may need to override the authorization token used
+        if (empty($postOptions['authorization_token']))
         {
-            // No auth token yet, use username/password
-            $httpHeaders[] = sprintf('Authorization: Basic %s', base64_encode($this->authHeader));
+            // No override - work out which auth token to use
+            if (is_null($this->authToken))
+            {
+                // No auth token yet, use username/password
+                $httpHeaders[] = sprintf('Authorization: Basic %s', base64_encode($this->authHeader));
+            }
+            else
+            {
+                // Use the auth token we have
+                $httpHeaders[] = sprintf('Authorization: %s', $this->authToken);
+            }
         }
         else
         {
-            // Use the auth token we have
-            $httpHeaders[] = sprintf('Authorization: %s', $this->authToken);
+            // Override - use the auth token specified
+            $httpHeaders[] = sprintf('Authorization: %s', $postOptions['authorization_token']);
         }
 
         $ch = $this->getBasicHttpClient($url, $method, $httpHeaders);
 
         if (!is_null($postData))
         {
-            curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($postData));
+            if ($postOptions['post_body_is_json'])
+            {
+                $postData = json_encode($postData);
+            }
+
+            curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
+        }
+
+        Log::info(sprintf('%s: %s', strtoupper($method), $url));
+        Log::debug('HTTP headers:', $httpHeaders);
+
+        // Only log a post body if we have one and it's in JSON format (i.e. not a file upload)
+        if (!is_null($postData) && $postOptions['post_body_is_json'])
+        {
+            Log::debug($postData);
         }
 
         $result = curl_exec($ch);
         $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
 
+        Log::info(sprintf('Received HTTP code %d', $httpCode));
+        Log::debug($result);
+
         if ($httpCode != 200 && $httpCode != 304)
         {
             throw new \Exception(sprintf('Exception from Backblaze B2: %s', $result));
@@ -238,6 +305,8 @@ class BackblazeB2Service
 
         curl_close($ch);
 
-        return json_decode($result);
+        return $postOptions['response_body_is_json']
+            ? json_decode($result)
+            : $result;
     }
 }

database/migrations/2019_09_10_085020_create_backblaze_b2_file_id_caches_table.php

@@ -0,0 +1,38 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateBackblazeB2FileIdCachesTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('backblaze_b2_file_id_caches', function (Blueprint $table) {
+            $table->bigIncrements('id');
+            $table->unsignedBigInteger('photo_id');
+            $table->string('storage_path');
+            $table->string('b2_file_id');
+            $table->timestamps();
+
+            $table->foreign('photo_id')
+                ->references('id')->on('photos')
+                ->onDelete('cascade');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('backblaze_b2_file_id_caches');
+    }
+}