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// Copyright 2017 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package oauth2
import (
"net/http"
"os"
"path/filepath"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"github.com/gorilla/sessions"
"github.com/markbates/goth"
"github.com/markbates/goth/gothic"
"github.com/markbates/goth/providers/github"
"github.com/satori/go.uuid"
)
var (
sessionUsersStoreKey = "gitea-oauth2-sessions"
providerHeaderKey = "gitea-oauth2-provider"
)
// Init initialize the setup of the OAuth2 library
func Init() {
sessionDir := filepath.Join(setting.AppDataPath, "sessions", "oauth2")
if err := os.MkdirAll(sessionDir, 0700); err != nil {
log.Fatal(4, "Fail to create dir %s: %v", sessionDir, err)
}
gothic.Store = sessions.NewFilesystemStore(sessionDir, []byte(sessionUsersStoreKey))
gothic.SetState = func(req *http.Request) string {
return uuid.NewV4().String()
}
gothic.GetProviderName = func(req *http.Request) (string, error) {
return req.Header.Get(providerHeaderKey), nil
}
}
// Auth OAuth2 auth service
func Auth(provider string, request *http.Request, response http.ResponseWriter) error {
// not sure if goth is thread safe (?) when using multiple providers
request.Header.Set(providerHeaderKey, provider)
// 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)
url, err := gothic.GetAuthURL(response, request)
if err == nil {
http.Redirect(response, request, url, http.StatusTemporaryRedirect)
}
return err
}
// ProviderCallback 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 ProviderCallback(provider string, request *http.Request, response http.ResponseWriter) (goth.User, error) {
// not sure if goth is thread safe (?) when using multiple providers
request.Header.Set(providerHeaderKey, provider)
user, err := gothic.CompleteUserAuth(response, request)
if err != nil {
return user, err
}
return user, nil
}
// RegisterProvider register a OAuth2 provider in goth lib
func RegisterProvider(providerName, providerType, clientID, clientSecret string) {
provider := createProvider(providerName, providerType, clientID, clientSecret)
if provider != nil {
goth.UseProviders(provider)
}
}
// RemoveProvider removes the given OAuth2 provider from the goth lib
func RemoveProvider(providerName string) {
delete(goth.GetProviders(), providerName)
}
// used to create different types of goth providers
func createProvider(providerName, providerType, clientID, clientSecret string) goth.Provider {
callbackURL := setting.AppURL + "user/oauth2/" + providerName + "/callback"
var provider goth.Provider
switch providerType {
case "github":
provider = github.New(clientID, clientSecret, callbackURL, "user:email")
}
// always set the name if provider is created so we can support multiple setups of 1 provider
if provider != nil {
provider.SetName(providerName)
}
return provider
}
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