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