Oauth2 consumer

cmd/web.go

@@ -204,6 +204,13 @@ func runWeb(ctx *cli.Context) error {
 		m.Post("/sign_up", bindIgnErr(auth.RegisterForm{}), user.SignUpPost)
 		m.Get("/reset_password", user.ResetPasswd)
 		m.Post("/reset_password", user.ResetPasswdPost)
+		m.Group("/oauth2", func() {
+			m.Get("/:provider", user.SignInOAuth)
+			m.Get("/:provider/callback", user.SignInOAuthCallback)
+		})
+		m.Get("/link_account", user.LinkAccount)
+		m.Post("/link_account_signin", bindIgnErr(auth.SignInForm{}), user.LinkAccountPostSignIn)
+		m.Post("/link_account_signup", bindIgnErr(auth.RegisterForm{}), user.LinkAccountPostRegister)
 		m.Group("/two_factor", func() {
 			m.Get("", user.TwoFactor)
 			m.Post("", bindIgnErr(auth.TwoFactorAuthForm{}), user.TwoFactorPost)
@@ -230,6 +237,7 @@ func runWeb(ctx *cli.Context) error {
 			Post(bindIgnErr(auth.NewAccessTokenForm{}), user.SettingsApplicationsPost)
 		m.Post("/applications/delete", user.SettingsDeleteApplication)
 		m.Route("/delete", "GET,POST", user.SettingsDelete)
+		m.Combo("/account_link").Get(user.SettingsAccountLinks).Post(user.SettingsDeleteAccountLink)
 		m.Group("/two_factor", func() {
 			m.Get("", user.SettingsTwoFactor)
 			m.Post("/regenerate_scratch", user.SettingsTwoFactorRegenerateScratch)

models/error.go

@@ -829,3 +829,43 @@ func IsErrUploadNotExist(err error) bool {
 func (err ErrUploadNotExist) Error() string {
 	return fmt.Sprintf("attachment does not exist [id: %d, uuid: %s]", err.ID, err.UUID)
 }
+
+//  ___________         __                             .__    .____                 .__          ____ ___
+//  \_   _____/__  ____/  |_  ___________  ____ _____  |  |   |    |    ____   ____ |__| ____   |    |   \______ ___________
+//   |    __)_\  \/  /\   __\/ __ \_  __ \/    \\__  \ |  |   |    |   /  _ \ / ___\|  |/    \  |    |   /  ___// __ \_  __ \
+//   |        \>    <  |  | \  ___/|  | \/   |  \/ __ \|  |__ |    |__(  <_> ) /_/  >  |   |  \ |    |  /\___ \\  ___/|  | \/
+//  /_______  /__/\_ \ |__|  \___  >__|  |___|  (____  /____/ |_______ \____/\___  /|__|___|  / |______//____  >\___  >__|
+//          \/      \/           \/           \/     \/               \/    /_____/         \/               \/     \/
+
+// ErrExternalLoginUserAlreadyExist represents a "ExternalLoginUserAlreadyExist" kind of error.
+type ErrExternalLoginUserAlreadyExist struct {
+	ExternalID    string
+	UserID        int64
+	LoginSourceID int64
+}
+
+// IsErrExternalLoginUserAlreadyExist checks if an error is a ExternalLoginUserAlreadyExist.
+func IsErrExternalLoginUserAlreadyExist(err error) bool {
+	_, ok := err.(ErrExternalLoginUserAlreadyExist)
+	return ok
+}
+
+func (err ErrExternalLoginUserAlreadyExist) Error() string {
+	return fmt.Sprintf("external login user already exists [externalID: %s, userID: %d, loginSourceID: %d]", err.ExternalID, err.UserID, err.LoginSourceID)
+}
+
+// ErrExternalLoginUserNotExist represents a "ExternalLoginUserNotExist" kind of error.
+type ErrExternalLoginUserNotExist struct {
+	UserID        int64
+	LoginSourceID int64
+}
+
+// IsErrExternalLoginUserNotExist checks if an error is a ExternalLoginUserNotExist.
+func IsErrExternalLoginUserNotExist(err error) bool {
+	_, ok := err.(ErrExternalLoginUserNotExist)
+	return ok
+}
+
+func (err ErrExternalLoginUserNotExist) Error() string {
+	return fmt.Sprintf("external login user link does not exists [userID: %d, loginSourceID: %d]", err.UserID, err.LoginSourceID)
+}

models/external_login_user.go

@@ -0,0 +1,74 @@
+// 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 models
+
+import "github.com/markbates/goth"
+
+// ExternalLoginUser makes the connecting between some existing user and additional external login sources
+type ExternalLoginUser struct {
+	ExternalID    string `xorm:"NOT NULL"`
+	UserID        int64 `xorm:"NOT NULL"`
+	LoginSourceID int64 `xorm:"NOT NULL"`
+}
+
+// GetExternalLogin checks if a externalID in loginSourceID scope already exists
+func GetExternalLogin(externalLoginUser *ExternalLoginUser) (bool, error) {
+	return x.Get(externalLoginUser)
+}
+
+// ListAccountLinks returns a map with the ExternalLoginUser and its LoginSource
+func ListAccountLinks(user *User) ([]*ExternalLoginUser, error) {
+	externalAccounts := make([]*ExternalLoginUser, 0, 5)
+	err := x.Where("user_id=?", user.ID).
+		Desc("login_source_id").
+		Find(&externalAccounts)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return externalAccounts, nil
+}
+
+// LinkAccountToUser link the gothUser to the user
+func LinkAccountToUser(user *User, gothUser goth.User) error {
+	loginSource, err := GetActiveOAuth2LoginSourceByName(gothUser.Provider)
+	if err != nil {
+		return err
+	}
+
+	externalLoginUser := &ExternalLoginUser{
+		ExternalID:    gothUser.UserID,
+		UserID:        user.ID,
+		LoginSourceID: loginSource.ID,
+	}
+	has, err := x.Get(externalLoginUser)
+	if err != nil {
+		return err
+	} else if has {
+		return ErrExternalLoginUserAlreadyExist{gothUser.UserID, user.ID, loginSource.ID}
+	}
+
+	_, err = x.Insert(externalLoginUser)
+	return err
+}
+
+// RemoveAccountLink will remove all external login sources for the given user
+func RemoveAccountLink(user *User, loginSourceID int64) (int64, error) {
+	deleted, err := x.Delete(&ExternalLoginUser{UserID: user.ID, LoginSourceID: loginSourceID})
+	if err != nil {
+		return deleted, err
+	}
+	if deleted < 1 {
+		return deleted, ErrExternalLoginUserNotExist{user.ID, loginSourceID}
+	}
+	return deleted, err
+}
+
+// RemoveAllAccountLinks will remove all external login sources for the given user
+func RemoveAllAccountLinks(user *User) error {
+	_, err := x.Delete(&ExternalLoginUser{UserID: user.ID})
+	return err
+}