gaefile is an open source golang project that implements simple file uploads and downloads using Google Cloud Storage.

First, clone it into your $GOPATH.

$ cd $GOPATH/src
$ git clone git@github.com:XiaonuoGantan/gaefile.git

Second, create two files under gaeserver/:

$ cd gaefile
$ touch gaeserver/ServiceAccountAccessID.txt
$ touch gaeserver/ServiceAccountPrivateKey.pem

The content of ServiceAccountAccessID.txt is a one line text which is your Google Service Account's email address that looks like ...@developer.gserviceaccount.com.

The content of ServiceAccountPrivateKey.pem is the Google service account private key. It is obtainable from the Google Developer Console. Details about how to obtain it is available at https://godoc.org/google.golang.org/cloud/storage#SignedURLOptions.

Third, change the option GOOGLE_CLOUD_STAORAGE_BUCKET in gaeserver/app.yaml to your own cloud storage bucket.

Fourth, run the server $ goapp serve -port 8090 -host 0.0.0.0 gaeserver.

Upload files:

$ cd gaeserver/sample_images
$ curl -X PUT -H 'X-Gaefile-Filename: image.jpeg' -H 'Content-Type: image/jpeg' --data-binary "@sample_image_1.jpg"  http://localhost:8090
{"key":"zHcmkYxgCZVw7A==_image.jpeg"}

Download files:

$ cd gaeserver/sample_images
$ curl -X GET -L http://localhost:8090/zHcmkYxgCZVw7A==_image.jpeg > downloaded.jpg
$ diff sample_image_1.jpg downloaded.jpg

If everything works, then the diff command above should output nothing since the downloaded image and the sample image are identical.