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// Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package oauth2
import (
"net/http"
"net/url"
"github.com/markbates/goth"
"github.com/markbates/goth/gothic"
)
// Callout redirects request/response pair to authenticate against the provider
func (source *Source) Callout(request *http.Request, response http.ResponseWriter, codeChallengeS256 string) error {
// not sure if goth is thread safe (?) when using multiple providers
request.Header.Set(ProviderHeaderKey, source.authSource.Name)
var querySuffix string
if codeChallengeS256 != "" {
querySuffix = "&" + url.Values{
"code_challenge_method": []string{"S256"},
"code_challenge": []string{codeChallengeS256},
}.Encode()
}
// don't use the default gothic begin handler to prevent issues when some error occurs
// normally the gothic library will write some custom stuff to the response instead of our own nice error page
// gothic.BeginAuthHandler(response, request)
gothRWMutex.RLock()
defer gothRWMutex.RUnlock()
url, err := gothic.GetAuthURL(response, request)
if err == nil {
// hacky way to set the code_challenge, but no better way until
// https://github.com/markbates/goth/issues/516 is resolved
http.Redirect(response, request, url+querySuffix, http.StatusTemporaryRedirect)
}
return err
}
// Callback handles OAuth callback, resolve to a goth user and send back to original url
// this will trigger a new authentication request, but because we save it in the session we can use that
func (source *Source) Callback(request *http.Request, response http.ResponseWriter, codeVerifier string) (goth.User, error) {
// not sure if goth is thread safe (?) when using multiple providers
request.Header.Set(ProviderHeaderKey, source.authSource.Name)
if codeVerifier != "" {
// hacky way to set the code_verifier...
// Will be picked up inside CompleteUserAuth: params := req.URL.Query()
// https://github.com/markbates/goth/pull/474/files
request = request.Clone(request.Context())
q := request.URL.Query()
q.Add("code_verifier", codeVerifier)
request.URL.RawQuery = q.Encode()
}
gothRWMutex.RLock()
defer gothRWMutex.RUnlock()
user, err := gothic.CompleteUserAuth(response, request)
if err != nil {
return user, err
}
return user, nil
}
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