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author | uzhas <uzhas@ydb.tech> | 2023-11-16 16:04:50 +0300 |
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committer | uzhas <uzhas@ydb.tech> | 2023-11-16 17:46:46 +0300 |
commit | 46f0c0079bb50609d2eeb6586642bcf114fc5239 (patch) | |
tree | 84e4e4978d57fe5de321ba69bf9d0c290de60a66 /vendor/golang.org/x/oauth2/authhandler/authhandler.go | |
parent | 73045e389397816cc2bdd6cd7818b4bce427b265 (diff) | |
download | ydb-46f0c0079bb50609d2eeb6586642bcf114fc5239.tar.gz |
enable ya make for go projects
Diffstat (limited to 'vendor/golang.org/x/oauth2/authhandler/authhandler.go')
-rw-r--r-- | vendor/golang.org/x/oauth2/authhandler/authhandler.go | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/vendor/golang.org/x/oauth2/authhandler/authhandler.go b/vendor/golang.org/x/oauth2/authhandler/authhandler.go new file mode 100644 index 0000000000..9bc6cd7bc5 --- /dev/null +++ b/vendor/golang.org/x/oauth2/authhandler/authhandler.go @@ -0,0 +1,94 @@ +// 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" +) + +const ( + // Parameter keys for AuthCodeURL method to support PKCE. + codeChallengeKey = "code_challenge" + codeChallengeMethodKey = "code_challenge_method" + + // Parameter key for Exchange method to support PKCE. + codeVerifierKey = "code_verifier" +) + +// PKCEParams holds parameters to support PKCE. +type PKCEParams struct { + Challenge string // The unpadded, base64-url-encoded string of the encrypted code verifier. + ChallengeMethod string // The encryption method (ex. S256). + Verifier string // The original, non-encrypted secret. +} + +// 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) + +// TokenSourceWithPKCE is an enhanced version of TokenSource with PKCE support. +// +// The pkce parameter supports PKCE flow, which uses code challenge and code verifier +// to prevent CSRF attacks. A unique code challenge and code verifier should be generated +// by the caller at runtime. See https://www.oauth.com/oauth2-servers/pkce/ for more info. +func TokenSourceWithPKCE(ctx context.Context, config *oauth2.Config, state string, authHandler AuthorizationHandler, pkce *PKCEParams) oauth2.TokenSource { + return oauth2.ReuseTokenSource(nil, authHandlerSource{config: config, ctx: ctx, authHandler: authHandler, state: state, pkce: pkce}) +} + +// 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 TokenSourceWithPKCE(ctx, config, state, authHandler, nil) +} + +type authHandlerSource struct { + ctx context.Context + config *oauth2.Config + authHandler AuthorizationHandler + state string + pkce *PKCEParams +} + +func (source authHandlerSource) Token() (*oauth2.Token, error) { + // Step 1: Obtain auth code. + var authCodeUrlOptions []oauth2.AuthCodeOption + if source.pkce != nil && source.pkce.Challenge != "" && source.pkce.ChallengeMethod != "" { + authCodeUrlOptions = []oauth2.AuthCodeOption{oauth2.SetAuthURLParam(codeChallengeKey, source.pkce.Challenge), + oauth2.SetAuthURLParam(codeChallengeMethodKey, source.pkce.ChallengeMethod)} + } + url := source.config.AuthCodeURL(source.state, authCodeUrlOptions...) + 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") + } + + // Step 2: Exchange auth code for access token. + var exchangeOptions []oauth2.AuthCodeOption + if source.pkce != nil && source.pkce.Verifier != "" { + exchangeOptions = []oauth2.AuthCodeOption{oauth2.SetAuthURLParam(codeVerifierKey, source.pkce.Verifier)} + } + return source.config.Exchange(source.ctx, code, exchangeOptions...) +} |