This is an example OAuth 2.0 utility that can:

• Generate authorization URL, and retrieve access token and refresh token
• Use a refresh token to exchange for an access token

This is not an official Google product.

To install:

$ git clone https://github.com/saturnism/oauth2util.git
$ cd oauth2util
$ go get

To install it into $GOBIN

$ go install

To run it as is:

$ go run oauth2util.go

To build:

$ go build oauth2util.go

To build for multiple platforms using Docker:

$ script/build

You need these. You must pass this in via the command line argument, or alternatively, set the environmental variable.

Passing in via the command line:

oauth2util --client_id=... --client_secret=... auth --scope=...
oauth2util --client_id=... --client_secret=... exchange -t [refresh_token]

Using environmental variable:

export OAUTH2_CLIENT_ID=...
export OAUTH2_CLIENT_SECRET=...

Following examples assumes you've set the client ID and client secret into environmental variables.

Authorize with Google using the profile scope:

oauth2util auth --scopes=profile

This will print out the token response, such as:

{
  "access_token": "..."
  "token_type": "...",
  "refresh_token": "...",
  "expiry": "..."
}

Authorize with different providers:

oauth2util --auth_url=... --token_url=... auth --scopes=...

You can also set the authorization URL and token URL in environmental variables:

export OAUTH2_AUTH_URL=...
export OAUTH2_TOKEN_URL=...
oauth2util auth --scope=...

You can exchange an existing refresh token for an access token:

oauth2util exchange -t [refresh_token]