feat: google oauth

cmd/root.go

@@ -65,8 +65,7 @@ var rootCmd = &cobra.Command{
 			GithubClientSecret: config.GithubClientSecret,
 			GoogleClientId:     config.GoogleClientId,
 			GoogleClientSecret: config.GoogleClientSecret,
-			MicrosoftClientId:     config.MicrosoftClientId,
-			MicrosoftClientSecret: config.MicrosoftClientSecret,
+			AppURL:             config.AppURL,
 		}
 
 		// Create auth service
@@ -128,8 +127,6 @@ func init() {
 	rootCmd.Flags().String("github-client-secret", "", "Github OAuth client secret.")
 	rootCmd.Flags().String("google-client-id", "", "Google OAuth client ID.")
 	rootCmd.Flags().String("google-client-secret", "", "Google OAuth client secret.")
-	rootCmd.Flags().String("microsoft-client-id", "", "Microsoft OAuth client ID.")
-	rootCmd.Flags().String("microsoft-client-secret", "", "Microsoft OAuth client secret.")
 	viper.BindEnv("port", "PORT")
 	viper.BindEnv("address", "ADDRESS")
 	viper.BindEnv("secret", "SECRET")
@@ -141,7 +138,5 @@ func init() {
 	viper.BindEnv("github-client-secret", "GITHUB_CLIENT_SECRET")
 	viper.BindEnv("google-client-id", "GOOGLE_CLIENT_ID")
 	viper.BindEnv("google-client-secret", "GOOGLE_CLIENT_SECRET")
-	viper.BindEnv("microsoft-client-id", "MICROSOFT_CLIENT_ID")
-	viper.BindEnv("microsoft-client-secret", "MICROSOFT_CLIENT_SECRET")
 	viper.BindPFlags(rootCmd.Flags())
 }

internal/providers/google.go

@@ -0,0 +1,39 @@
+package providers
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+)
+
+type GoogleUserinfoResponse struct {
+	Email string `json:"email"`
+}
+
+func GoogleScopes() []string {
+	return []string{"https://www.googleapis.com/auth/userinfo.email"}
+}
+
+func GetGoogleEmail(client *http.Client) (string, error) {
+	res, resErr := client.Get("https://www.googleapis.com/userinfo/v2/me")
+
+	if resErr != nil {
+		return "", resErr
+	}
+
+	body, bodyErr := io.ReadAll(res.Body)
+
+	if bodyErr != nil {
+		return "", bodyErr
+	}
+
+	var user GoogleUserinfoResponse
+
+	jsonErr := json.Unmarshal(body, &user)
+
+	if jsonErr != nil {
+		return "", jsonErr
+	}
+
+	return user.Email, nil
+}

internal/providers/providers.go

@@ -1,6 +1,7 @@
 package providers
 
 import (
+	"fmt"
 	"tinyauth/internal/oauth"
 	"tinyauth/internal/types"
 
@@ -28,17 +29,31 @@ func (providers *Providers) Init() {
 		providers.Github = oauth.NewOAuth(oauth2.Config{
 			ClientID:     providers.Config.GithubClientId,
 			ClientSecret: providers.Config.GithubClientSecret,
+			RedirectURL:  fmt.Sprintf("%s/api/oauth/callback/github", providers.Config.AppURL),
 			Scopes:       GithubScopes(),
 			Endpoint:     endpoints.GitHub,
 		})
 		providers.Github.Init()
 	}
+	if providers.Config.GoogleClientId != "" && providers.Config.GoogleClientSecret != "" {
+		log.Info().Msg("Initializing Google OAuth")
+		providers.Google = oauth.NewOAuth(oauth2.Config{
+			ClientID:     providers.Config.GoogleClientId,
+			ClientSecret: providers.Config.GoogleClientSecret,
+			RedirectURL:  fmt.Sprintf("%s/api/oauth/callback/google", providers.Config.AppURL),
+			Scopes:       GoogleScopes(),
+			Endpoint:     endpoints.Google,
+		})
+		providers.Google.Init()
+	}
 }
 
 func (providers *Providers) GetProvider(provider string) *oauth.OAuth {
 	switch provider {
 	case "github":
 		return providers.Github
+	case "google":
+		return providers.Google
 	default:
 		return nil
 	}
@@ -56,6 +71,16 @@ func (providers *Providers) GetUser(provider string) (string, error) {
 			return "", emailErr
 		}
 		return email, nil
+	case "google":
+		if providers.Google == nil {
+			return "", nil
+		}
+		client := providers.Google.GetClient()
+		email, emailErr := GetGoogleEmail(client)
+		if emailErr != nil {
+			return "", emailErr
+		}
+		return email, nil
 	default:
 		return "", nil
 	}
@@ -66,5 +91,8 @@ func (provider *Providers) GetConfiguredProviders() []string {
 	if provider.Github != nil {
 		providers = append(providers, "github")
 	}
+	if provider.Google != nil {
+		providers = append(providers, "google")
+	}
 	return providers
 }

internal/types/types.go

@@ -30,8 +30,6 @@ type Config struct {
 	GithubClientSecret string `mapstructure:"github-client-secret"`
 	GoogleClientId     string `mapstructure:"google-client-id"`
 	GoogleClientSecret string `mapstructure:"google-client-secret"`
-	MicrosoftClientId     string `mapstructure:"microsoft-client-id"`
-	MicrosoftClientSecret string `mapstructure:"microsoft-client-secret"`
 }
 
 type UserContext struct {
@@ -54,8 +52,7 @@ type OAuthConfig struct {
 	GithubClientSecret string
 	GoogleClientId     string
 	GoogleClientSecret string
-	MicrosoftClientId     string
-	MicrosoftClientSecret string
+	AppURL             string
 }
 
 type OAuthRequest struct {