inital implementation of using GitLab OAuth2 provider for signup/login

store/sql_user_store.go

@@ -31,8 +31,10 @@ func NewSqlUserStore(sqlStore *SqlStore) UserStore {
 		table.ColMap("Roles").SetMaxSize(64)
 		table.ColMap("Props").SetMaxSize(4000)
 		table.ColMap("NotifyProps").SetMaxSize(2000)
+		table.ColMap("AuthService").SetMaxSize(32)
 		table.SetUniqueTogether("Email", "TeamId")
 		table.SetUniqueTogether("Username", "TeamId")
+		table.SetUniqueTogether("AuthData", "AuthService", "TeamId")
 	}
 
 	return us
@@ -57,6 +59,8 @@ func (us SqlUserStore) UpgradeSchemaIfNeeded() {
 			panic("Failed to set last name from nickname " + err.Error())
 		}
 	}
+
+	us.CreateColumnIfNotExists("Users", "AuthService", "LastPictureUpdate", "varchar(32)", "") // for OAuth Client
 }
 
 //func (ss SqlStore) CreateColumnIfNotExists(tableName string, columnName string, afterName string, colType string, defaultValue string) bool {
@@ -369,6 +373,28 @@ func (us SqlUserStore) GetByEmail(teamId string, email string) StoreChannel {
 	return storeChannel
 }
 
+func (us SqlUserStore) GetByAuth(teamId string, authData string, authService string) StoreChannel {
+
+	storeChannel := make(StoreChannel)
+
+	go func() {
+		result := StoreResult{}
+
+		user := model.User{}
+
+		if err := us.GetReplica().SelectOne(&user, "SELECT * FROM Users WHERE TeamId=? AND AuthData=? AND AuthService=?", teamId, authData, authService); err != nil {
+			result.Err = model.NewAppError("SqlUserStore.GetByAuth", "We couldn't find the existing account", "teamId="+teamId+", authData="+authData+", authService="+authService+", "+err.Error())
+		}
+
+		result.Data = &user
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}
+
 func (us SqlUserStore) GetByUsername(teamId string, username string) StoreChannel {
 
 	storeChannel := make(StoreChannel)

store/store.go

@@ -85,6 +85,7 @@ type UserStore interface {
 	Get(id string) StoreChannel
 	GetProfiles(teamId string) StoreChannel
 	GetByEmail(teamId string, email string) StoreChannel
+	GetByAuth(teamId string, authData string, authService string) StoreChannel
 	GetByUsername(teamId string, username string) StoreChannel
 	VerifyEmail(userId string) StoreChannel
 	GetEtagForProfiles(teamId string) StoreChannel