113 lines
3.6 KiB
Go
113 lines
3.6 KiB
Go
// Copyright 2014 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 clientcredentials implements the OAuth2.0 "client credentials" token flow,
|
|
// also known as the "two-legged OAuth 2.0".
|
|
//
|
|
// This should be used when the client is acting on its own behalf or when the client
|
|
// is the resource owner. It may also be used when requesting access to protected
|
|
// resources based on an authorization previously arranged with the authorization
|
|
// server.
|
|
//
|
|
// See http://tools.ietf.org/html/draft-ietf-oauth-v2-31#section-4.4
|
|
package clientcredentials // import "golang.org/x/oauth2/clientcredentials"
|
|
|
|
import (
|
|
"net/http"
|
|
"net/url"
|
|
"strings"
|
|
|
|
"golang.org/x/net/context"
|
|
"golang.org/x/oauth2"
|
|
"golang.org/x/oauth2/internal"
|
|
)
|
|
|
|
// tokenFromInternal maps an *internal.Token struct into
|
|
// an *oauth2.Token struct.
|
|
func tokenFromInternal(t *internal.Token) *oauth2.Token {
|
|
if t == nil {
|
|
return nil
|
|
}
|
|
tk := &oauth2.Token{
|
|
AccessToken: t.AccessToken,
|
|
TokenType: t.TokenType,
|
|
RefreshToken: t.RefreshToken,
|
|
Expiry: t.Expiry,
|
|
}
|
|
return tk.WithExtra(t.Raw)
|
|
}
|
|
|
|
// retrieveToken takes a *Config and uses that to retrieve an *internal.Token.
|
|
// This token is then mapped from *internal.Token into an *oauth2.Token which is
|
|
// returned along with an error.
|
|
func retrieveToken(ctx context.Context, c *Config, v url.Values) (*oauth2.Token, error) {
|
|
tk, err := internal.RetrieveToken(ctx, c.ClientID, c.ClientSecret, c.TokenURL, v)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return tokenFromInternal(tk), nil
|
|
}
|
|
|
|
// Client Credentials Config describes a 2-legged OAuth2 flow, with both the
|
|
// client application information and the server's endpoint URLs.
|
|
type Config struct {
|
|
// ClientID is the application's ID.
|
|
ClientID string
|
|
|
|
// ClientSecret is the application's secret.
|
|
ClientSecret string
|
|
|
|
// TokenURL is the resource server's token endpoint
|
|
// URL. This is a constant specific to each server.
|
|
TokenURL string
|
|
|
|
// Scope specifies optional requested permissions.
|
|
Scopes []string
|
|
}
|
|
|
|
// Token uses client credentials to retrieve a token.
|
|
// The HTTP client to use is derived from the context.
|
|
// If nil, http.DefaultClient is used.
|
|
func (c *Config) Token(ctx context.Context) (*oauth2.Token, error) {
|
|
return retrieveToken(ctx, c, url.Values{
|
|
"grant_type": {"client_credentials"},
|
|
"scope": internal.CondVal(strings.Join(c.Scopes, " ")),
|
|
})
|
|
}
|
|
|
|
// Client returns an HTTP client using the provided token.
|
|
// The token will auto-refresh as necessary. The underlying
|
|
// HTTP transport will be obtained using the provided context.
|
|
// The returned client and its Transport should not be modified.
|
|
func (c *Config) Client(ctx context.Context) *http.Client {
|
|
return oauth2.NewClient(ctx, c.TokenSource(ctx))
|
|
}
|
|
|
|
// TokenSource returns a TokenSource that returns t until t expires,
|
|
// automatically refreshing it as necessary using the provided context and the
|
|
// client ID and client secret.
|
|
//
|
|
// Most users will use Config.Client instead.
|
|
func (c *Config) TokenSource(ctx context.Context) oauth2.TokenSource {
|
|
source := &tokenSource{
|
|
ctx: ctx,
|
|
conf: c,
|
|
}
|
|
return oauth2.ReuseTokenSource(nil, source)
|
|
}
|
|
|
|
type tokenSource struct {
|
|
ctx context.Context
|
|
conf *Config
|
|
}
|
|
|
|
// Token refreshes the token by using a new client credentials request.
|
|
// tokens received this way do not include a refresh token
|
|
func (c *tokenSource) Token() (*oauth2.Token, error) {
|
|
return retrieveToken(c.ctx, c.conf, url.Values{
|
|
"grant_type": {"client_credentials"},
|
|
"scope": internal.CondVal(strings.Join(c.conf.Scopes, " ")),
|
|
})
|
|
}
|