Initial commit of Google Cloud Storage File Adapter

src/Adapters/Files/GCSAdapter.js

@@ -0,0 +1,96 @@
+// GCSAdapter
+// Store Parse Files in Google Cloud Storage: https://cloud.google.com/storage
+import * as gcloud from 'gcloud';
+import { FilesAdapter } from './FilesAdapter';
+
+export class GCSAdapter extends FilesAdapter {
+  // GCS Project ID and the name of a corresponding Keyfile are required.
+  // See https://googlecloudplatform.github.io/gcloud-node/#/docs/master/guides/authentication
+  // for more details.
+  constructor(
+    projectId,
+    keyFilename,
+    bucket,
+    { bucketPrefix = '',
+      directAccess = false } = {}
+  ) {
+    super();
+
+    this._bucket = bucket;
+    this._bucketPrefix = bucketPrefix;
+    this._directAccess = directAccess;
+
+    let gcsOptions = {
+      projectId: projectId,
+      keyFilename: keyFilename
+    };
+
+    this._gcsClient = new gcloud.storage(gcsOptions);
+  }
+
+  // For a given config object, filename, and data, store a file in GCS.
+  // Resolves the promise or fails with an error.
+  createFile(config, filename, data) {
+    return new Promise((resolve, reject) => {
+      let file = this._gcsClient.bucket(this._bucket).file(this._bucketPrefix + filename);
+      // gcloud supports upload(file) not upload(bytes), so we need to stream.
+      var uploadStream = file.createWriteStream(options);
+      uploadStream.on('error', (err) => {
+        return reject(err);
+      }).on('finish', () => {
+        // Second call to set public read ACL after object is uploaded.
+        if (this._directAccess) {
+          file.makePublic((err, res) => {
+            if (err !== null) {
+              return reject(err);
+            }
+            resolve();
+          });
+        }
+        resolve();
+      });
+      uploadStream.write(data);
+      uploadStream.end();
+    });
+  }
+
+  // Deletes a file with the given file name.
+  // Returns a promise that succeeds with the delete response, or fails with an error.
+  deleteFile(config, filename) {
+    return new Promise((resolve, reject) => {
+      let file = this._gcsClient.bucket(this._bucket).file(this._bucketPrefix + filename);
+      file.delete((err, res) => {
+        if(err !== null) {
+          return reject(err);
+        }
+        resolve(res);
+      });
+    });
+  }
+
+  // Search for and return a file if found by filename.
+  // Returns a promise that succeeds with the buffer result from GCS, or fails with an error.
+  getFileData(config, filename) {
+    return new Promise((resolve, reject) => {
+      let file = this._gcsClient.bucket(this._bucket).file(this._bucketPrefix + filename);
+      file.download((err, data) => {
+        if (err !== null) {
+          return reject(err);
+        }
+        resolve(data);
+      });
+    });
+  }
+
+  // Generates and returns the location of a file stored in GCS for the given request and filename.
+  // The location is the direct GCS link if the option is set,
+  // otherwise we serve the file through parse-server.
+  getFileLocation(config, filename) {
+    if (this._directAccess) {
+      return `https://${this._bucket}.storage.googleapis.com/${this._bucketPrefix + filename}`;
+    }
+    return (config.mount + '/files/' + config.applicationId + '/' + encodeURIComponent(filename));
+  }
+}
+
+export default GCSAdapter;