feat: google oauth

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
 }