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