init

internal/auth/google.go

@@ -0,0 +1,78 @@
+package auth
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"golang.org/x/oauth2"
+	"golang.org/x/oauth2/google"
+	"google.golang.org/api/healthcare/v1"
+	"google.golang.org/api/option"
+)
+
+// TODO: Ganti Auth dengan lib Goth
+
+// GoogleClient handles authentication with Google APIs
+type GoogleClient struct {
+	credentialsPath string
+	tokenSource     *google.Credentials
+}
+
+// NewGoogleClient creates a new Google authentication client
+func NewGoogleClient(credentialsPath string) (*GoogleClient, error) {
+	client := &GoogleClient{
+		credentialsPath: credentialsPath,
+	}
+
+	// Initialize on creation to validate credentials
+	if _, err := client.getToken(); err != nil {
+		return nil, fmt.Errorf("failed to initialize Google client: %w", err)
+	}
+
+	return client, nil
+}
+
+// GetAccessToken returns a valid access token for Google APIs
+func (c *GoogleClient) GetAccessToken() (string, error) {
+	tokenSource, err := c.getToken()
+	if err != nil {
+		return "", err
+	}
+
+	// Retrieve the token using the Token() method
+	token, err := tokenSource.Token()
+	if err != nil {
+		return "", fmt.Errorf("failed to retrieve token: %w", err)
+	}
+
+	return token.AccessToken, nil
+}
+
+// GetHealthcareClient returns a configured Healthcare API client
+func (c *GoogleClient) GetHealthcareClient(ctx context.Context) (*healthcare.Service, error) {
+	opts := []option.ClientOption{
+		option.WithCredentialsFile(c.credentialsPath),
+		option.WithScopes(healthcare.CloudPlatformScope),
+	}
+
+	return healthcare.NewService(ctx, opts...)
+}
+
+// getToken retrieves a token from the credentials file
+func (c *GoogleClient) getToken() (oauth2.TokenSource, error) { // Change return type to oauth2.TokenSource
+	if c.tokenSource != nil {
+		return c.tokenSource.TokenSource, nil // Access the TokenSource field
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	credentials, err := google.FindDefaultCredentials(ctx, healthcare.CloudPlatformScope)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get default credentials: %w", err)
+	}
+
+	c.tokenSource = credentials
+	return credentials.TokenSource, nil // Return the TokenSource field
+}