Refine README

README.md

@@ -1,2 +1,61 @@
-# skipper-gcstorage
-A Skipper adapter for Google Cloud storage.
+# [<img title="skipper-gcstorage - Google Cloud Storage adapter for Skipper" src="http://i.imgur.com/P6gptnI.png" width="200px" alt="skipper emblem - face of a ship's captain"/>](https://github.com/ChenglongMa/skipper-gcstorage.git) Google Cloud Storage Blob Adapter
+
+
+
+**Google Cloud Storage** adapter for receiving [upstreams](https://github.com/balderdashy/skipper#what-are-upstreams). Particularly useful for handling streaming multipart file uploads from the [Skipper](https://github.com/balderdashy/skipper) body parser.
+
+## Installation
+
+[![NPM](https://nodei.co/npm/skipper-gcstorage.png)](https://npmjs.org/package/skipper-gcstorage)
+
+```
+$ npm i skipper-gcstorage
+```
+
+## Usage
+
+```javascript
+req.file('avatar')
+.upload({
+  // Required
+  adapter: require('skipper-gcstorage'),
+  bucket: 'existing_or_new_bucket_name', // Will create new one if no such bucket exists.
+  // Optional
+  projectId: 'GOOGLE_CLOUD_PROJECT', // Mandatory if `keyFilename` was specified.
+  keyFilename: 'GOOGLE_APPLICATION_CREDENTIALS', 
+  bucketMetadata: {},
+  maxBytes: 60000, 
+  metadata: {},
+  public: true
+}, function whenDone(err, uploadedFiles) {
+  if (err) {
+    return res.serverError(err);
+  }
+  return res.ok({
+    files: uploadedFiles,
+    textParams: req.params.all()
+  });
+});
+```
+Please don't check in your GCP credentials :)
+
+### NOTE
+
+1. `Skipper-GCStorage` will create new bucket if specified one does not exist.
+   1. Assign bucket metadata into `bucketMetadata`.
+2. Support multiple ways for **Authentication**
+   1. Specify `projectId` AND `keyFilename`;
+   2. `export` `GOOGLE_APPLICATION_CREDENTIALS` environment variable;
+   3. Login with an eligible [service account](https://cloud.google.com/iam/docs/service-accounts);
+   4. \*For more details, please refer to https://cloud.google.com/docs/authentication/production#command-line.
+3. Use with [sails-hook-uploads](https://www.npmjs.com/package/sails-hook-uploads) for better results :)
+
+
+## License
+
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+
+## Acknowledgement
+
+1. [Sails Skipper](https://github.com/sailshq/skipper)
+2. [Skipper-S3](https://github.com/balderdashy/skipper-s3)

index.js

@@ -9,7 +9,7 @@ const mime = require("mime");
  * @param  {Dictionary} globalOpts
  *         @property {String?} projectId
  *         @property {String?} keyFilename
- *         @property {String?} bucket
+ *         @property {String} bucket
  *         @property {Object?} bucketMetadata used to create non-existing bucket
  *         @property {Number?} maxBytes
  *         @property {Object?} metadata The metadata of gcs file