/
firebase.go
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/
firebase.go
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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package auth
import (
"context"
"log"
"net/http"
"peoplemath/models"
"strings"
"time"
"firebase.google.com/go/v4/auth"
)
// FirebaseAuth is an Auth implementation which uses Firebase for authentication.
type FirebaseAuth struct {
FirebaseClient firebaseAuthClient
AuthTimeout time.Duration
}
type firebaseAuthClient interface {
VerifyIDToken(ctx context.Context, idToken string) (*auth.Token, error)
}
func (auth *FirebaseAuth) Authenticate(next http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
ctx, cancel := context.WithTimeout(r.Context(), auth.AuthTimeout)
defer cancel()
idToken := strings.TrimPrefix(r.Header.Get("Authorization"), "Bearer ")
token, err := auth.FirebaseClient.VerifyIDToken(ctx, idToken)
if err != nil {
w.Header().Add("Authorization", "WWW-Authenticate: Bearer")
log.Printf("User authentication failed: %v", err)
http.Error(w, "User authentication failed", http.StatusUnauthorized)
return
}
if !token.Claims["email_verified"].(bool) {
w.Header().Add("Authorization", "WWW-Authenticate: Bearer")
http.Error(w, "User authentication failed, please verify your email address", http.StatusUnauthorized)
return
}
userEmail := token.Claims["email"].(string)
user := models.User{
Email: userEmail,
Domain: getDomain(userEmail),
}
ctxWithUser := context.WithValue(r.Context(), ContextKey("user"), user)
next(w, r.WithContext(ctxWithUser))
}
}
// TODO The below code is likely to be the same for any Auth implementation which
// actually wants to perform permissions checks. Move it into a separate type.
func getTeamAllowedUsers(team models.Team, action string) []models.UserMatcher {
var permissions []models.UserMatcher
if action == ActionRead {
permissions = team.Permissions.Read.Allow
} else if action == ActionWrite {
permissions = team.Permissions.Write.Allow
} else {
log.Fatalf("The permission action passed (%v) is not implemented.", action)
}
return permissions
}
func getGeneralAllowedUsers(generalPermissions models.GeneralPermissions, action string) []models.UserMatcher {
var permissions []models.UserMatcher
if action == ActionRead {
permissions = generalPermissions.ReadTeamList.Allow
} else if action == ActionWrite {
permissions = generalPermissions.AddTeam.Allow
} else {
log.Fatalf("The permission action passed (%v) is not implemented.", action)
}
return permissions
}
func (auth *FirebaseAuth) CanActOnTeam(user models.User, team models.Team, action string) bool {
permissions := getTeamAllowedUsers(team, action)
return user.IsPermitted(permissions)
}
func (auth *FirebaseAuth) CanActOnTeamList(user models.User, generalPermissions models.GeneralPermissions, action string) bool {
permissions := getGeneralAllowedUsers(generalPermissions, action)
return user.IsPermitted(permissions)
}