file DELETE support

src/Adapters/Files/FilesAdapter.js

@@ -14,6 +14,8 @@
 export class FilesAdapter {
   createFile(config, filename, data) { }
 
+  deleteFile(config, filename) { }
+
   getFileData(config, filename) { }
 
   getFileLocation(config, filename) { }

src/Adapters/Files/GridStoreAdapter.js

@@ -20,6 +20,17 @@ export class GridStoreAdapter extends FilesAdapter {
     });
   }
 
+  deleteFile(config, filename) {
+    return config.database.connect().then(() => {
+      let gridStore = new GridStore(config.database.db, filename, 'w');
+      return gridStore.open();
+    }).then((gridStore) => {
+      return gridStore.unlink();
+    }).then((gridStore) => {
+      return gridStore.close();
+    });
+  }
+
   getFileData(config, filename) {
     return config.database.connect().then(() => {
       return GridStore.exist(config.database.db, filename);

src/Adapters/Files/S3Adapter.js

@@ -56,6 +56,20 @@ export class S3Adapter extends FilesAdapter {
     });
   }
 
+  deleteFile(config, filename) {
+    return new Promise((resolve, reject) => {
+      let params = {
+        Key: this._bucketPrefix + filename
+      };
+      this._s3Client.deleteObject(params, (err, data) =>{
+        if(err !== null) {
+          return reject(err);
+        }
+        resolve(data);
+      });
+    });
+  }
+
   // Search for and return a file if found by filename
   // Returns a promise that succeeds with the buffer result from S3
   getFileData(config, filename) {