Task Tile

[Hemanth-2002]

What - description of what you me to do Example: Hey @autopilot implement a Google sign-in on my website. Make changes to the front end and the back end of the application

Why - explain why this is important Example: I want to allow users to signup and login using their Google account

[codeautopilot[bot]]

Potential solution

To implement Google sign-in functionality on your website, we need to make changes to both the front end and the back end of the application. The back end will handle the OAuth2 flow, including generating the OAuth2 URL, exchanging the authorization code for tokens, and storing the necessary user information. The front end will handle the user interface for initiating the sign-in process.

How to implement

Back End Changes

1. Update authorization/authuser.go

Add fields to the User struct to store Google OAuth2 information and update the NewUserAuth function to initialize these fields.

package authorization

// User contains user's information
type User struct {
    Username    string
    Email       string
    GoogleID    string
    AccessToken string
    RefreshToken string
}

// NewUserAuth returns a new user
func NewUserAuth(username string, email string, googleID string, accessToken string, refreshToken string) (*User, error) {
    user := &User{
        Username:    username,
        Email:       email,
        GoogleID:    googleID,
        AccessToken: accessToken,
        RefreshToken: refreshToken,
    }

    return user, nil
}

2. Update model/model.go

Add fields to the User struct to store Google OAuth2 information.

package model

import "github.com/jinzhu/gorm"

type User struct {
    gorm.Model
    UserName    string
    Password    string
    Email       string
    PhoneNumber string
    Booking     []Booking
    GoogleID    string // Field to store Google ID
    AccessToken string // Field to store Google OAuth2 access token
    RefreshToken string // Field to store Google OAuth2 refresh token
}

3. Update authorization/jwt_manager.go

Modify the UserClaims struct and the Generate and Verify methods to support Google OAuth2 information.

package authorization

import (
    "fmt"
    "time"

    "github.com/dgrijalva/jwt-go"
)

// JWTManager is a JSON web token manager
type JWTManager struct {
    SecretKey     string
    TokenDuration time.Duration
}

// UserClaims is a custom JWT claims that contains some user's information
type UserClaims struct {
    jwt.StandardClaims
    Username string `json:"username"`
    Email    string `json:"email"`
    GoogleID string `json:"google_id,omitempty"` // Add GoogleID field
}

// NewJWTManager returns a new JWT manager
func NewJWTManager(secretKey string, tokenDuration time.Duration) *JWTManager {
    return &JWTManager{secretKey, tokenDuration}
}

// Generate generates and signs a new token for a user
func (manager *JWTManager) Generate(user *User) (string, error) {
    claims := UserClaims{
        StandardClaims: jwt.StandardClaims{
            ExpiresAt: time.Now().Add(manager.TokenDuration).Unix(),
        },
        Username: user.Username,
        Email:    user.Email,
        GoogleID: user.GoogleID, // Include GoogleID in the claims
    }

    token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
    return token.SignedString([]byte(manager.SecretKey))
}

// Verify verifies the access token string and return a user claim if the token is valid
func (manager *JWTManager) Verify(accessToken string) (*UserClaims, error) {
    token, err := jwt.ParseWithClaims(
        accessToken,
        &UserClaims{},
        func(token *jwt.Token) (interface{}, error) {
            _, ok := token.Method.(*jwt.SigningMethodHMAC)
            if !ok {
                return nil, fmt.Errorf("unexpected token signing method")
            }

            return []byte(manager.SecretKey), nil
        },
    )

    if err != nil {
        return nil, fmt.Errorf("invalid token: %w", err)
    }

    claims, ok := token.Claims.(*UserClaims)
    if !ok {
        return nil, fmt.Errorf("invalid token claims")
    }

    return claims, nil
}

4. Update utils/utils.go

Add utility functions for Google OAuth2.

package utils

import (
    "context"
    "fmt"
    "log"
    "net/http"
    "os"

    "github.com/joho/godotenv"
    "golang.org/x/oauth2"
    "golang.org/x/oauth2/google"
)

var googleOAuthConfig *oauth2.Config

func init() {
    LoadEnv()
    googleOAuthConfig = &oauth2.Config{
        RedirectURL:  os.Getenv("GOOGLE_REDIRECT_URL"),
        ClientID:     os.Getenv("GOOGLE_CLIENT_ID"),
        ClientSecret: os.Getenv("GOOGLE_CLIENT_SECRET"),
        Scopes:       []string{"https://www.googleapis.com/auth/userinfo.email", "https://www.googleapis.com/auth/userinfo.profile"},
        Endpoint:     google.Endpoint,
    }
}

func GenerateGoogleOAuthURL(state string) string {
    return googleOAuthConfig.AuthCodeURL(state)
}

func ExchangeAuthCodeForToken(code string) (*oauth2.Token, error) {
    token, err := googleOAuthConfig.Exchange(context.Background(), code)
    if err != nil {
        return nil, fmt.Errorf("failed to exchange auth code for token: %v", err)
    }
    return token, nil
}

func HandleOAuth2Error(w http.ResponseWriter, err error) {
    http.Error(w, fmt.Sprintf("OAuth2 error: %v", err), http.StatusInternalServerError)
}

func PanicError(err error) {
    if err != nil {
        panic(err)
    }
}

func CheckError(err error) {
    if err != nil {
        log.Print(err)
    }
}

func CheckCall(err error) {
    if err != nil {
        fmt.Println("call unsuccessful")
    }
}

func LoadEnv() {
    envErr := godotenv.Load(".env")
    if envErr != nil {
        fmt.Printf("Could not load .env file")
        os.Exit(1)
    }
}

func MailInfo(sender string, amount string, receiver string, coupon string, mode string) string {
    jsonInfo := fmt.Sprintf(`{
        "personalizations": [
            {
                "to": [
                    {
                        "email": "%s"
                    }
                ],
                "subject": "Payment Report"
            }
        ],
        "from": {
            "email": "%s"
        },
        "content": [
            {
                "type": "text/plain",
                "value": "Your payment is successful !!!\n\nThe following are the payment details:\n\nAmount: %s\n\nDiscount Coupon Number: %s\n\nPayment Mode: %s\n\nThank You For Booking With Us"
            }
        ]
    }`, receiver, sender, amount, coupon, mode)
    return jsonInfo
}

5. Update database/database.go

Ensure that the CreateUser and UpdateUser methods handle the new fields.

package database

import (
    "bms/model"

    "github.com/jinzhu/gorm"
)

type DataBase interface {
    CreateUser(model.User) (uint, error)
    UpdateUser(model.User) error
    GetShow(int) ([]model.Show, error)
    UpdateShow(model.Show) error
    AddSeat(model.Seat) error
    AddPayment(model.Payment) (model.User, error)
    AddMovie(model.Movie) error
    GetMovies() ([]model.Movie, error)
    GetMovie(model.Movie) ([]model.Movie, error)
    UpdateMovie(model.Movie) error
    AddBooking(model.Booking) error
    GetBookings(int) ([]model.Booking, error)
    CancelBooking(int) error
}

type DBClient struct {
    Db *gorm.DB
}

func (db DBClient) CreateUser(user model.User) (uint, error) {
    DB := db.Db.Save(&user)
    return user.ID, DB.Error
}

func (db DBClient) UpdateUser(user model.User) error {
    DB := db.Db.Save(&user)
    return DB.Error
}

func (db DBClient) GetShow(theatreId int) ([]model.Show, error) {
    Shows := []model.Show{}
    DB := db.Db.Where(&model.Show{TheatreID: int(theatreId)}).Find(&Shows)
    return Shows, DB.Error
}

func (db DBClient) UpdateShow(show model.Show) error {
    DB := db.Db.Save(&show)
    return DB.Error
}

func (db DBClient) AddSeat(seat model.Seat) error {
    DB := db.Db.Save(&seat)
    return DB.Error
}

func (db DBClient) AddPayment(payment model.Payment) (model.User, error) {
    user := model.User{}
    db.Db.Save(&payment)
    DB := db.Db.Where("id = ?", payment.UserID).Find(&user)
    return user, DB.Error
}

func (db DBClient) AddMovie(movie model.Movie) error {
    DB := db.Db.Save(&movie)
    return DB.Error
}

func (db DBClient) GetMovies() ([]model.Movie, error) {
    Movies := []model.Movie{}
    DB := db.Db.Find(&Movies)
    return Movies, DB.Error
}

func (db DBClient) GetMovie(movie model.Movie) ([]model.Movie, error) {
    Movies := []model.Movie{}
    DB := db.Db.Model(&Movies).Where(&movie).Find(&Movies)
    return Movies, DB.Error
}

func (db DBClient) UpdateMovie(movie model.Movie) error {
    DB := db.Db.Save(&movie)
    return DB.Error
}

func (db DBClient) AddBooking(booking model.Booking) error {
    DB := db.Db.Save(&booking)
    return DB.Error
}

func (db DBClient) GetBookings(userId int) ([]model.Booking, error) {
    Bookings := []model.Booking{}
    DB := db.Db.Where("user_id = ?", userId).Find(&Bookings)
    return Bookings, DB.Error
}

func (db DBClient) CancelBooking(bookingId int) error {
    DB := db.Db.Model(&model.Booking{}).Where("id=?", bookingId).Delete(&model.Booking{})
    return DB.Error
}

6. Update server/user.go

Add endpoints for initiating the Google OAuth2 sign-in process and handling the OAuth2 callback.

package server

import (
    "context"
    "encoding/json"
    "log"
    "net/http"

    "golang.org/x/oauth2"
    "golang.org/x/oauth2/google"
    "bms/model"
    "bms/utils"
    pb "bms/bmsproto"
)

// OAuth2 configuration
var googleOauthConfig = &oauth2.Config{
    RedirectURL:  "http://localhost:8080/auth/google/callback",
    ClientID:     "YOUR_GOOGLE_CLIENT_ID",
    ClientSecret: "YOUR_GOOGLE_CLIENT_SECRET",
    Scopes:       []string{"https://www.googleapis.com/auth/userinfo.email", "https://www.googleapis.com/auth/userinfo.profile"},
    Endpoint:     google.Endpoint,
}

// function to add new user on server
func (s *BmsServer) CreateUser(ctx context.Context, in *pb.NewUser) (*pb.User, error) {
    log.Printf("creating new user called")
    newUser := model.User{
        UserName:    in.GetUserName(),
        Password:    in.GetPassword(),
        Email:       in.GetEmail(),
        PhoneNumber: in.GetPhoneNumber(),
    }
    userId, err := s.Db.CreateUser(newUser)
    utils.CheckCall(err)
    if err != nil {
        return nil, err
    }
    return &pb.User{UserName: newUser.UserName, Password: newUser.Password, Email: newUser.Email, PhoneNumber: newUser.PhoneNumber, Id: uint64(userId)}, nil
}

// function to update user info on server
func (s *BmsServer) UpdateUser(ctx context.Context, in *pb.User) (*pb.User, error) {
    log.Printf("update user info called")
    updatedUser := model.User{
        Password:    in.GetPassword(),
        Email:       in.GetEmail(),
        PhoneNumber: in.GetPhoneNumber(),
    }
    updatedUser.ID = uint(in.Id)
    err := s.Db.UpdateUser(updatedUser)
    utils.CheckCall(err)
    if err != nil {
        return nil, err
    }
    return &pb.User{Password: updatedUser.Password, Email: updatedUser.Email, PhoneNumber: updatedUser.PhoneNumber}, nil
}

// InitiateGoogleSignIn initiates the Google OAuth2 sign-in process
func (s *BmsServer) InitiateGoogleSignIn(w http.ResponseWriter, r *http.Request) {
    url := googleOauthConfig.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
    http.Redirect(w, r, url, http.StatusTemporaryRedirect)
}

// HandleGoogleCallback handles the OAuth2 callback from Google
func (s *BmsServer) HandleGoogleCallback(w http.ResponseWriter, r *http.Request) {
    code := r.URL.Query().Get("code")
    token, err := googleOauthConfig.Exchange(context.Background(), code)
    if err != nil {
        http.Error(w, "Failed to exchange token: "+err.Error(), http.StatusInternalServerError)
        return
    }

    client := googleOauthConfig.Client(context.Background(), token)
    resp, err := client.Get("https://www.googleapis.com/oauth2/v2/userinfo")
    if err != nil {
        http.Error(w, "Failed to get user info: "+err.Error(), http.StatusInternalServerError)
        return
    }
    defer resp.Body.Close()

    var userInfo struct {
        ID            string `json:"id"`
        Email         string `json:"email"`
        VerifiedEmail bool   `json:"verified_email"`
        Picture       string `json:"picture"`
    }

    if err := json.NewDecoder(resp.Body).Decode(&userInfo); err != nil {
        http.Error(w, "Failed to decode user info: "+err.Error(), http.StatusInternalServerError)
        return
    }

    // Here you would typically create or update the user in your database
    // For example:
    // user := model.User{
    //  GoogleID:    userInfo.ID,
    //  Email:       userInfo.Email,
    //  AccessToken: token.AccessToken,
    //  RefreshToken: token.RefreshToken,
    // }
    // s.Db.CreateOrUpdateUser(user)

    // For now, just return the user info as JSON
    w.Header().Set("Content-Type", "application/json")
    json.NewEncoder(w).Encode(userInfo)
}

Explanation

1. OAuth2 Configuration:

   • googleOauthConfig is configured with the client ID, client secret, redirect URL, and scopes required for Google OAuth2.

2. InitiateGoogleSignIn:

   • Generates the Google OAuth2 URL and redirects the user to Google's OAuth2 server.

3. HandleGoogleCallback:

   • Handles the OAuth2 callback, exchanges the authorization code for an access token, retrieves user information from Google, and returns it as JSON.

This implementation provides the necessary endpoints to initiate Google sign-in and handle the OAuth2 callback, integrating Google OAuth2 authentication into your application.

Click here to create a Pull Request with the proposed solution

Files used for this task:

Changes on authorization/authuser.go

To address the task for the `authorization/authuser.go` file, you need to add fields to the `User` struct to store Google OAuth2 information such as Google ID, access token, and refresh token. Here is a concrete proposal for modifying the file: 1. **Add New Fields to the `User` Struct**: Include fields for `GoogleID`, `AccessToken`, and `RefreshToken`. 2. **Update the `NewUserAuth` Function**: Modify the function to accept and initialize the new fields. Here is the updated code for `authorization/authuser.go`: ```go package authorization // User contains user's information type User struct { Username string Email string GoogleID string AccessToken string RefreshToken string } // NewUserAuth returns a new user func NewUserAuth(username string, email string, googleID string, accessToken string, refreshToken string) (*User, error) { user := &User{ Username: username, Email: email, GoogleID: googleID, AccessToken: accessToken, RefreshToken: refreshToken, } return user, nil } ``` ### Explanation: 1. **Struct Update**: The `User` struct now includes `GoogleID`, `AccessToken`, and `RefreshToken` fields to store the necessary Google OAuth2 information. 2. **Function Update**: The `NewUserAuth` function has been updated to accept additional parameters for `GoogleID`, `AccessToken`, and `RefreshToken`, and initializes these fields in the `User` struct. This change ensures that the `User` struct can store the required Google OAuth2 information, which is essential for implementing Google sign-in functionality.

Changes on model/model.go

To update the `User` model to include fields for Google OAuth2 information, you need to add fields for storing the Google ID, access token, and refresh token. Here is a concrete proposal for modifying the `User` struct in the `model/model.go` file: ### Updated `model/model.go` ```go // package main package model import "github.com/jinzhu/gorm" type User struct { gorm.Model UserName string Password string Email string PhoneNumber string Booking []Booking GoogleID string // Field to store Google ID AccessToken string // Field to store Google OAuth2 access token RefreshToken string // Field to store Google OAuth2 refresh token } type Booking struct { gorm.Model UserID int ShowID int Amount int Payment []Payment Seat []Seat } type Movie struct { gorm.Model MovieName string Director string Description string Rating int Language string Genre string ReleaseDate string Status string Show []Show } type Show struct { gorm.Model Date string StartTime string EndTime string MovieID int TheatreID int Booking []Booking } type Theatre struct { gorm.Model Location string TheatreName string TotalSeats int Show []Show } type Seat struct { gorm.Model SeatNumber int BookingID int } type Payment struct { gorm.Model Amount int DiscountCouponID int Mode string Status bool BookingID int UserID int } ``` ### Explanation 1. **GoogleID**: This field will store the unique identifier for the user provided by Google. 2. **AccessToken**: This field will store the OAuth2 access token received from Google. 3. **RefreshToken**: This field will store the OAuth2 refresh token received from Google, which can be used to obtain a new access token when the current one expires. These fields will allow your application to store and manage Google OAuth2 authentication information for users. ### Next Steps 1. **Database Migration**: Ensure that your database schema is updated to include these new fields. This might involve writing a migration script if you are using a migration tool. 2. **Update Other Files**: Coordinate with the other agent to ensure that the changes in other files (like `authorization/authuser.go`, `authorization/jwt_manager.go`, etc.) are consistent with these updates. If you have any further questions or need additional modifications, feel free to ask!

Changes on authorization/jwt_manager.go

To update the JWT generation and verification logic to support users authenticated via Google OAuth2, we need to make some modifications to the `UserClaims` struct and the `Generate` and `Verify` methods in the `JWTManager` struct. Here's a step-by-step plan: 1. **Update `UserClaims` Struct**: - Add fields to store Google OAuth2 information such as `GoogleID`. 2. **Modify `Generate` Method**: - Update the method to include the new fields in the JWT claims. 3. **Modify `Verify` Method**: - Ensure the method can handle the new fields in the JWT claims. Here is the updated code for `authorization/jwt_manager.go`: ```go package authorization import ( "fmt" "time" "github.com/dgrijalva/jwt-go" ) // JWTManager is a JSON web token manager type JWTManager struct { SecretKey string TokenDuration time.Duration } // UserClaims is a custom JWT claims that contains some user's information type UserClaims struct { jwt.StandardClaims Username string `json:"username"` Email string `json:"email"` GoogleID string `json:"google_id,omitempty"` // Add GoogleID field } // NewJWTManager returns a new JWT manager func NewJWTManager(secretKey string, tokenDuration time.Duration) *JWTManager { return &JWTManager{secretKey, tokenDuration} } // Generate generates and signs a new token for a user func (manager *JWTManager) Generate(user *User) (string, error) { claims := UserClaims{ StandardClaims: jwt.StandardClaims{ ExpiresAt: time.Now().Add(manager.TokenDuration).Unix(), }, Username: user.Username, Email: user.Email, GoogleID: user.GoogleID, // Include GoogleID in the claims } token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims) return token.SignedString([]byte(manager.SecretKey)) } // Verify verifies the access token string and return a user claim if the token is valid func (manager *JWTManager) Verify(accessToken string) (*UserClaims, error) { token, err := jwt.ParseWithClaims( accessToken, &UserClaims{}, func(token *jwt.Token) (interface{}, error) { _, ok := token.Method.(*jwt.SigningMethodHMAC) if !ok { return nil, fmt.Errorf("unexpected token signing method") } return []byte(manager.SecretKey), nil }, ) if err != nil { return nil, fmt.Errorf("invalid token: %w", err) } claims, ok := token.Claims.(*UserClaims) if !ok { return nil, fmt.Errorf("invalid token claims") } return claims, nil } ``` ### Explanation: 1. **UserClaims Struct**: - Added a new field `GoogleID` to store the Google ID of the user. 2. **Generate Method**: - Updated the `Generate` method to include the `GoogleID` field in the JWT claims. 3. **Verify Method**: - No changes were needed in the `Verify` method logic, but it will now correctly parse and return the `GoogleID` field if present. This update ensures that the JWT tokens generated and verified by the `JWTManager` can now include and handle Google OAuth2 information.

Changes on utils/utils.go

To address the task of adding utility functions for Google OAuth2 in the `utils/utils.go` file, we need to implement the following functions: 1. **GenerateGoogleOAuthURL**: This function will generate the Google OAuth2 URL for user redirection. 2. **ExchangeAuthCodeForToken**: This function will handle the exchange of the authorization code for an access token. 3. **HandleOAuth2Error**: This function will handle any OAuth2-related errors. Here's how you can implement these functions: ### Step-by-Step Implementation 1. **GenerateGoogleOAuthURL**: - This function will create the URL to which the user will be redirected for Google authentication. - It will use the client ID, redirect URI, and scopes. 2. **ExchangeAuthCodeForToken**: - This function will exchange the authorization code received from Google for an access token. - It will use the client ID, client secret, and the authorization code. 3. **HandleOAuth2Error**: - This function will handle any errors that occur during the OAuth2 process. ### Updated `utils/utils.go` File ```go package utils import ( "context" "fmt" "log" "net/http" "os" "github.com/joho/godotenv" "golang.org/x/oauth2" "golang.org/x/oauth2/google" ) var googleOAuthConfig *oauth2.Config func init() { LoadEnv() googleOAuthConfig = &oauth2.Config{ RedirectURL: os.Getenv("GOOGLE_REDIRECT_URL"), ClientID: os.Getenv("GOOGLE_CLIENT_ID"), ClientSecret: os.Getenv("GOOGLE_CLIENT_SECRET"), Scopes: []string{"https://www.googleapis.com/auth/userinfo.email", "https://www.googleapis.com/auth/userinfo.profile"}, Endpoint: google.Endpoint, } } func GenerateGoogleOAuthURL(state string) string { return googleOAuthConfig.AuthCodeURL(state) } func ExchangeAuthCodeForToken(code string) (*oauth2.Token, error) { token, err := googleOAuthConfig.Exchange(context.Background(), code) if err != nil { return nil, fmt.Errorf("failed to exchange auth code for token: %v", err) } return token, nil } func HandleOAuth2Error(w http.ResponseWriter, err error) { http.Error(w, fmt.Sprintf("OAuth2 error: %v", err), http.StatusInternalServerError) } func PanicError(err error) { if err != nil { panic(err) } } func CheckError(err error) { if err != nil { log.Print(err) } } func CheckCall(err error) { if err != nil { fmt.Println("call unsuccessful") } } func LoadEnv() { envErr := godotenv.Load(".env") if envErr != nil { fmt.Printf("Could not load .env file") os.Exit(1) } } func MailInfo(sender string, amount string, receiver string, coupon string, mode string) string { jsonInfo := fmt.Sprintf(`{ "personalizations": [ { "to": [ { "email": "%s" } ], "subject": "Payment Report" } ], "from": { "email": "%s" }, "content": [ { "type": "text/plain", "value": "Your payment is successful !!!\n\nThe following are the payment details:\n\nAmount: %s\n\nDiscount Coupon Number: %s\n\nPayment Mode: %s\n\nThank You For Booking With Us" } ] }`, receiver, sender, amount, coupon, mode) return jsonInfo } ``` ### Explanation 1. **Initialization**: - The `init` function loads environment variables and initializes the `googleOAuthConfig` with the necessary OAuth2 configuration. 2. **GenerateGoogleOAuthURL**: - This function generates the Google OAuth2 URL using the state parameter for security. 3. **ExchangeAuthCodeForToken**: - This function exchanges the authorization code for an access token using the OAuth2 configuration. 4. **HandleOAuth2Error**: - This function handles any OAuth2-related errors by sending an appropriate HTTP response. By adding these utility functions, you will be able to handle Google OAuth2 authentication in your application effectively.

Changes on database/database.go

To update the database operations to handle the new fields in the User model for storing Google OAuth2 information, you need to make sure that the `CreateUser` and `UpdateUser` methods in the `DBClient` struct can handle the new fields. Here’s a step-by-step plan to achieve this: 1. **Update the User Model**: Ensure that the `User` model in `model/model.go` includes fields for Google ID, access token, and refresh token. 2. **Modify the Database Operations**: Update the `CreateUser` and `UpdateUser` methods to handle the new fields. ### Step-by-Step Implementation 1. **Update the User Model**: - Open `model/model.go`. - Add the new fields to the `User` struct: ```go type User struct { ID uint `gorm:"primary_key"` Name string Email string Password string GoogleID string AccessToken string RefreshToken string } ``` 2. **Modify the Database Operations**: - Open `database/database.go`. - Ensure that the `CreateUser` and `UpdateUser` methods handle the new fields correctly. ### Updated `database/database.go` ```go package database import ( "bms/model" "github.com/jinzhu/gorm" ) type DataBase interface { CreateUser(model.User) (uint, error) UpdateUser(model.User) error GetShow(int) ([]model.Show, error) UpdateShow(model.Show) error AddSeat(model.Seat) error AddPayment(model.Payment) (model.User, error) AddMovie(model.Movie) error GetMovies() ([]model.Movie, error) GetMovie(model.Movie) ([]model.Movie, error) UpdateMovie(model.Movie) error AddBooking(model.Booking) error GetBookings(int) ([]model.Booking, error) CancelBooking(int) error } type DBClient struct { Db *gorm.DB } func (db DBClient) CreateUser(user model.User) (uint, error) { DB := db.Db.Save(&user) return user.ID, DB.Error } func (db DBClient) UpdateUser(user model.User) error { DB := db.Db.Save(&user) return DB.Error } func (db DBClient) GetShow(theatreId int) ([]model.Show, error) { Shows := []model.Show{} DB := db.Db.Where(&model.Show{TheatreID: int(theatreId)}).Find(&Shows) return Shows, DB.Error } func (db DBClient) UpdateShow(show model.Show) error { DB := db.Db.Save(&show) return DB.Error } func (db DBClient) AddSeat(seat model.Seat) error { DB := db.Db.Save(&seat) return DB.Error } func (db DBClient) AddPayment(payment model.Payment) (model.User, error) { user := model.User{} db.Db.Save(&payment) DB := db.Db.Where("id = ?", payment.UserID).Find(&user) return user, DB.Error } func (db DBClient) AddMovie(movie model.Movie) error { DB := db.Db.Save(&movie) return DB.Error } func (db DBClient) GetMovies() ([]model.Movie, error) { Movies := []model.Movie{} DB := db.Db.Find(&Movies) return Movies, DB.Error } func (db DBClient) GetMovie(movie model.Movie) ([]model.Movie, error) { Movies := []model.Movie{} DB := db.Db.Model(&Movies).Where(&movie).Find(&Movies) return Movies, DB.Error } func (db DBClient) UpdateMovie(movie model.Movie) error { DB := db.Db.Save(&movie) return DB.Error } func (db DBClient) AddBooking(booking model.Booking) error { DB := db.Db.Save(&booking) return DB.Error } func (db DBClient) GetBookings(userId int) ([]model.Booking, error) { Bookings := []model.Booking{} DB := db.Db.Where("user_id = ?", userId).Find(&Bookings) return Bookings, DB.Error } func (db DBClient) CancelBooking(bookingId int) error { DB := db.Db.Model(&model.Booking{}).Where("id=?", bookingId).Delete(&model.Booking{}) return DB.Error } ``` ### Summary - Ensure the `User` model includes fields for Google OAuth2 information. - Update the `CreateUser` and `UpdateUser` methods in `database/database.go` to handle these new fields. This will allow the database operations to correctly store and update the Google OAuth2 information for users.

Changes on server/user.go

To implement Google sign-in functionality in the `server/user.go` file, you need to add endpoints for initiating the Google OAuth2 sign-in process and handling the OAuth2 callback. Here’s a concrete plan to achieve this: ### Plan for `server/user.go` 1. **Add Import Statements**: - Import necessary packages for handling HTTP requests, OAuth2, and JSON encoding/decoding. 2. **Define OAuth2 Configuration**: - Define a global OAuth2 configuration using the `oauth2.Config` struct. 3. **Implement `InitiateGoogleSignIn` Endpoint**: - Create a function to generate the Google OAuth2 URL and redirect the user to Google's OAuth2 server. 4. **Implement `HandleGoogleCallback` Endpoint**: - Create a function to handle the OAuth2 callback, exchange the authorization code for an access token, and retrieve user information from Google. ### Updated `server/user.go` Code ```go package server import ( "context" "encoding/json" "log" "net/http" "golang.org/x/oauth2" "golang.org/x/oauth2/google" "bms/model" "bms/utils" pb "bms/bmsproto" ) // OAuth2 configuration var googleOauthConfig = &oauth2.Config{ RedirectURL: "http://localhost:8080/auth/google/callback", ClientID: "YOUR_GOOGLE_CLIENT_ID", ClientSecret: "YOUR_GOOGLE_CLIENT_SECRET", Scopes: []string{"https://www.googleapis.com/auth/userinfo.email", "https://www.googleapis.com/auth/userinfo.profile"}, Endpoint: google.Endpoint, } // function to add new user on server func (s *BmsServer) CreateUser(ctx context.Context, in *pb.NewUser) (*pb.User, error) { log.Printf("creating new user called") newUser := model.User{ UserName: in.GetUserName(), Password: in.GetPassword(), Email: in.GetEmail(), PhoneNumber: in.GetPhoneNumber(), } userId, err := s.Db.CreateUser(newUser) utils.CheckCall(err) if err != nil { return nil, err } return &pb.User{UserName: newUser.UserName, Password: newUser.Password, Email: newUser.Email, PhoneNumber: newUser.PhoneNumber, Id: uint64(userId)}, nil } // function to update user info on server func (s *BmsServer) UpdateUser(ctx context.Context, in *pb.User) (*pb.User, error) { log.Printf("update user info called") updatedUser := model.User{ Password: in.GetPassword(), Email: in.GetEmail(), PhoneNumber: in.GetPhoneNumber(), } updatedUser.ID = uint(in.Id) err := s.Db.UpdateUser(updatedUser) utils.CheckCall(err) if err != nil { return nil, err } return &pb.User{Password: updatedUser.Password, Email: updatedUser.Email, PhoneNumber: updatedUser.PhoneNumber}, nil } // InitiateGoogleSignIn initiates the Google OAuth2 sign-in process func (s *BmsServer) InitiateGoogleSignIn(w http.ResponseWriter, r *http.Request) { url := googleOauthConfig.AuthCodeURL("state-token", oauth2.AccessTypeOffline) http.Redirect(w, r, url, http.StatusTemporaryRedirect) } // HandleGoogleCallback handles the OAuth2 callback from Google func (s *BmsServer) HandleGoogleCallback(w http.ResponseWriter, r *http.Request) { code := r.URL.Query().Get("code") token, err := googleOauthConfig.Exchange(context.Background(), code) if err != nil { http.Error(w, "Failed to exchange token: "+err.Error(), http.StatusInternalServerError) return } client := googleOauthConfig.Client(context.Background(), token) resp, err := client.Get("https://www.googleapis.com/oauth2/v2/userinfo") if err != nil { http.Error(w, "Failed to get user info: "+err.Error(), http.StatusInternalServerError) return } defer resp.Body.Close() var userInfo struct { ID string `json:"id"` Email string `json:"email"` VerifiedEmail bool `json:"verified_email"` Picture string `json:"picture"` } if err := json.NewDecoder(resp.Body).Decode(&userInfo); err != nil { http.Error(w, "Failed to decode user info: "+err.Error(), http.StatusInternalServerError) return } // Here you would typically create or update the user in your database // For example: // user := model.User{ // GoogleID: userInfo.ID, // Email: userInfo.Email, // AccessToken: token.AccessToken, // RefreshToken: token.RefreshToken, // } // s.Db.CreateOrUpdateUser(user) // For now, just return the user info as JSON w.Header().Set("Content-Type", "application/json") json.NewEncoder(w).Encode(userInfo) } ``` ### Explanation 1. **OAuth2 Configuration**: - `googleOauthConfig` is configured with the client ID, client secret, redirect URL, and scopes required for Google OAuth2. 2. **InitiateGoogleSignIn**: - Generates the Google OAuth2 URL and redirects the user to Google's OAuth2 server. 3. **HandleGoogleCallback**: - Handles the OAuth2 callback, exchanges the authorization code for an access token, retrieves user information from Google, and returns it as JSON. This implementation provides the necessary endpoints to initiate Google sign-in and handle the OAuth2 callback, integrating Google OAuth2 authentication into your application.

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