mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-11-14 01:41:23 +00:00
57 lines
1.9 KiB
Go
57 lines
1.9 KiB
Go
// Copyright 2021 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Package authhandler implements a TokenSource to support
|
|
// "three-legged OAuth 2.0" via a custom AuthorizationHandler.
|
|
package authhandler
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
|
|
"golang.org/x/oauth2"
|
|
)
|
|
|
|
// AuthorizationHandler is a 3-legged-OAuth helper that prompts
|
|
// the user for OAuth consent at the specified auth code URL
|
|
// and returns an auth code and state upon approval.
|
|
type AuthorizationHandler func(authCodeURL string) (code string, state string, err error)
|
|
|
|
// TokenSource returns an oauth2.TokenSource that fetches access tokens
|
|
// using 3-legged-OAuth flow.
|
|
//
|
|
// The provided context.Context is used for oauth2 Exchange operation.
|
|
//
|
|
// The provided oauth2.Config should be a full configuration containing AuthURL,
|
|
// TokenURL, and Scope.
|
|
//
|
|
// An environment-specific AuthorizationHandler is used to obtain user consent.
|
|
//
|
|
// Per the OAuth protocol, a unique "state" string should be specified here.
|
|
// This token source will verify that the "state" is identical in the request
|
|
// and response before exchanging the auth code for OAuth token to prevent CSRF
|
|
// attacks.
|
|
func TokenSource(ctx context.Context, config *oauth2.Config, state string, authHandler AuthorizationHandler) oauth2.TokenSource {
|
|
return oauth2.ReuseTokenSource(nil, authHandlerSource{config: config, ctx: ctx, authHandler: authHandler, state: state})
|
|
}
|
|
|
|
type authHandlerSource struct {
|
|
ctx context.Context
|
|
config *oauth2.Config
|
|
authHandler AuthorizationHandler
|
|
state string
|
|
}
|
|
|
|
func (source authHandlerSource) Token() (*oauth2.Token, error) {
|
|
url := source.config.AuthCodeURL(source.state)
|
|
code, state, err := source.authHandler(url)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if state != source.state {
|
|
return nil, errors.New("state mismatch in 3-legged-OAuth flow")
|
|
}
|
|
return source.config.Exchange(source.ctx, code)
|
|
}
|