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
+}