CODEWITHSUNDEEP
google-apigoogle-cloud-storage
Ali Aqrabawi
Ali Aqrabawi

Reputation: 143

uploading fails to google cloud storage using rest API POST

I'm trying to figure out how to upload a file to google cloud storage using rest API , i don't want to use the client Library .

i read the documents but it was not helpful for a beginner in this flied ,

anyone can give me a step-by-step how to do this ? and how the URL/header/body format should look like , if also can give me an examples that would be very helpful .

Upvotes: 0

Views: 2279

Answers (2)

Jayoti Parkash
Jayoti Parkash

Reputation: 878

You can find the same example here:

https://stackoverflow.com/a/53955058/4345389

in which I already explained how to upload a file to google cloud storage using rest API.

Thanks

Upvotes: 0

Brandon Yarbrough
Brandon Yarbrough

Reputation: 38399

If you're not going to use any of the helper libraries and are also a beginner, the hardest part of implementing an upload to GCS will likely be authenticating yourself. Let's ignore that for now.

The simplest way to upload an object to Google Cloud Storage is to make an HTTPS call to storage.googleapis.com that looks like this:

PUT /your-bucket-name/your-object.txt HTTP/1.1
Authorization:  (YOUR ACCESS TOKEN GOES HERE)
Content-Length: 20
Content-Type: text/plain-or-whatever; charset=utf-8
Host: storage.googleapis.com
User-Agent: YourApplication/1.0

This is a test file

That will upload a file named "your-object.txt" of type "text/plain-or-whatever" to the bucket "your-bucket-name", with the contents "This is a test file."

If your bucket allows anonymous users to upload files (you shouldn't do that), then just don't include the Authorization line and you're done.

Now, since you really don't want to use any client libraries, and that presumably includes Google's OAuth libraries, you're going to need to implement authorization yourself, so let me give you an overview.

First, though, if you want to try this out immediately, install the "gcloud" tool, login with "gcloud auth login", and the print an access token with gcloud auth print-access-token. Then use the Authorization header Authorization: Bearer whatever.gcloudprintedout. That way you can be off and running with GCS quickly. But the token will only last an hour or so, so you'll need to implement OAuth for real.

Google Cloud APIs use OAuth to handle their requests, which is a powerful but not simple auth mechanism. There's extensive documentation on how OAuth with Google works: https://developers.google.com/identity/protocols/OAuth2

And there's also more general information on authorizing Google Cloud requests: https://cloud.google.com/docs/authentication

If you are running your application on a Google Cloud technology like App Engine or GCE, auth will be somewhat easier, but I will assume you're running this on your own machine. I will further assume that you want your application to have its own identity, rather than simply having you log in as part of the upload flow. For such a case, you'll need a service account, which will have an associated private key.

The basic flow for a service account is that you will create a JWT request for access credentials, then cryptographically sign that request with your private key, then send that signed request to Google. It will return you a token that may then be passed to your actual upload request later. You can keep using that token until it expires, at which time you'll need to build another JWT request to request another token.

Again, the client libraries entirely take care of this whole process for you. I am describing the approach of implementing everything exclusively on your own.

Upvotes: 1

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