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(PHP Extension) Facebook Download all Photos to Local FilesDemonstrates how to download all of one's Facebook photos to a local filesystem directory. This sample code keeps a local cache to avoid re-downloading the same photos twice. The program can be run again after a time, and it will download only photos that haven't yet been downloaded.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // This example will use a local disk cache to avoid re-fetching the same // photo id after it's been fetched once. $fbCache = new CkCache(); // The cache will use 1 level of 256 sub-directories. $fbCache->put_Level(1); // Use a directory path that makes sense on your operating system.. $fbCache->AddRoot('C:/fbCache'); // This example assumes a previously obtained an access token $oauth2 = new CkOAuth2(); $oauth2->put_AccessToken('FACEBOOK-ACCESS-TOKEN'); $rest = new CkRest(); // Connect to Facebook. $success = $rest->Connect('graph.facebook.com',443,true,true); if ($success != true) { print $rest->lastErrorText() . "\n"; exit; } // Provide the authentication credentials (i.e. the access key) $rest->SetAuthOAuth2($oauth2); // There are two choices: // We can choose to download the photos the person is tagged in or has uploaded // by setting type to "tagged" or "uploaded". $rest->AddQueryParam('type','uploaded'); // To download all photos, we begin with an outer loop that iterates over // the list of photo nodes in pages. Each page returned contains a list of // photo node ids. Each photo node id must be retrieved to get the download URL(s) // of the actual image. // I don't know the max limit for the number of records that can be downloaded at once. $rest->AddQueryParam('limit','100'); // Get the 1st page of photos ids. // See https://developers.facebook.com/docs/graph-api/reference/user/photos/ for more information. $responseJson = $rest->fullRequestNoBody('GET','/v2.7/me/photos'); if ($rest->get_LastMethodSuccess() != true) { print $rest->lastErrorText() . "\n"; exit; } $photoJson = new CkJsonObject(); $saPhotoUrls = new CkStringArray(); $sbPhotoIdPath = new CkStringBuilder(); $json = new CkJsonObject(); $json->put_EmitCompact(false); $json->Load($responseJson); // Get the "after" cursor. $afterCursor = $json->stringOf('paging.cursors.after'); while ($json->get_LastMethodSuccess() == true) { print '-------------------' . "\n"; print 'afterCursor = ' . $afterCursor . "\n"; // For each photo id in this page... $i = 0; $numItems = $json->SizeOfArray('data'); while ($i < $numItems) { $json->put_I($i); $photoId = $json->stringOf('data[i].id'); print 'photoId = ' . $photoId . "\n"; // We need to fetch the JSON for this photo. Check to see if it's in the local disk cache, // and if not, then get it from Facebook. $photoJsonStr = $fbCache->fetchText($photoId); if ($fbCache->get_LastMethodSuccess() == false) { // It's not locally available, so get it from Facebook.. $sbPhotoIdPath->Clear(); $sbPhotoIdPath->Append('/v2.7/'); $sbPhotoIdPath->Append($photoId); $rest->ClearAllQueryParams(); $rest->AddQueryParam('fields','id,album,images'); print 'Fetching photo node from Facebook...' . "\n"; // This REST request will continue using the existing connection. // If the connection was closed, it will automatically reconnect to send the request. $photoJsonStr = $rest->fullRequestNoBody('GET',$sbPhotoIdPath->getAsString()); if ($rest->get_LastMethodSuccess() != true) { print $rest->lastErrorText() . "\n"; exit; } // Add the photo JSON to the local cache. $fbCache->SaveTextNoExpire($photoId,'',$photoJsonStr); } // Parse the photo JSON and add the main photo download URL to saPhotoUrls // There may be multiple URLs in the images array, but the 1st one is the largest and main photo URL. // The others are smaller sizes of the same photo. $photoJson->Load($photoJsonStr); $imageUrl = $photoJson->stringOf('images[0].source'); if ($photoJson->get_LastMethodSuccess() == true) { // Actually, we'll add a small JSON document that contains both the image ID and the URL. $imgUrlJson = new CkJsonObject(); $imgUrlJson->AppendString('id',$photoId); $imgUrlJson->AppendString('url',$imageUrl); $saPhotoUrls->Append($imgUrlJson->emit()); print 'imageUrl = ' . $imageUrl . "\n"; } $i = $i + 1; } // Prepare for getting the next page of photos ids. // We can continue using the same REST object. // If already connected, we'll continue using the existing connection. // Otherwise, a new connection will automatically be made if needed. $rest->ClearAllQueryParams(); $rest->AddQueryParam('type','uploaded'); $rest->AddQueryParam('limit','20'); $rest->AddQueryParam('after',$afterCursor); // Get the next page of photo ids. $responseJson = $rest->fullRequestNoBody('GET','/v2.7/me/photos'); if ($rest->get_LastMethodSuccess() != true) { print $rest->lastErrorText() . "\n"; exit; } $json->Load($responseJson); $afterCursor = $json->stringOf('paging.cursors.after'); } print 'No more pages of photos.' . "\n"; // Now iterate over the photo URLs and download each to a file. // We can use Chilkat HTTP. No Facebook authorization (access token) is required to download // the photo once the URL is known. $http = new CkHttp(); // We'll cache the image data so that if run again, we don't re-download the same image again. $numUrls = $saPhotoUrls->get_Count(); $i = 0; $urlJson = new CkJsonObject(); $imageBytes = new CkByteData(); $fac = new CkFileAccess(); while ($i < $numUrls) { $urlJson->Load($saPhotoUrls->getString($i)); $photoId = $urlJson->stringOf('id'); $imageUrl = $urlJson->stringOf('url'); // Check the local cache for the image data. // Only download and save if not already cached. $success = $fbCache->FetchFromCache($imageUrl,$imageBytes); if ($fbCache->get_LastMethodSuccess() == false) { // This photo needs to be downloaded. $sbImageUrl = new CkStringBuilder(); $sbImageUrl->Append($imageUrl); // Let's form a filename.. $extension = '.jpg'; if ($sbImageUrl->Contains('.gif',false) == true) { $extension = '.gif'; } if ($sbImageUrl->Contains('.png',false) == true) { $extension = '.png'; } if ($sbImageUrl->Contains('.tiff',false) == true) { $extension = '.tiff'; } if ($sbImageUrl->Contains('.bmp',false) == true) { $extension = '.bmp'; } $sbLocalFilePath = new CkStringBuilder(); $sbLocalFilePath->Append('C:/Photos/facebook/uploaded/'); $sbLocalFilePath->Append($photoId); $sbLocalFilePath->Append($extension); $success = $http->QuickGet($imageUrl,$imageBytes); if ($http->get_LastMethodSuccess() != true) { print $http->lastErrorText() . "\n"; exit; } // We've downloaded the photo image bytes into memory. // Save it to the cache AND save it to the output file. $fbCache->SaveToCacheNoExpire($imageUrl,'',$imageBytes); $fac->WriteEntireFile($sbLocalFilePath->getAsString(),$imageBytes); print 'Downloaded to ' . $sbLocalFilePath->getAsString() . "\n"; } $i = $i + 1; } print 'Finished downloading all Facebook photos!' . "\n"; ?> |
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