🌅 complete OS X keychain implementation.

Signed-off-by: David Calavera <david.calavera@gmail.com>

plugin/server.go

@@ -0,0 +1,43 @@
+package plugin
+
+import "github.com/calavera/docker-credential-helpers/credentials"
+
+// CredentialsGetResponse holds the information sent to docker after
+// a request for credentials.
+type CredentialsGetResponse struct {
+	Error    string
+	Username string
+	Password string
+}
+
+func (p *credentialsPlugin) Get(c *credentials.Credentials, resp *CredentialsGetResponse) error {
+	username, password, err := p.helper.Get(c.ServerURL)
+	if err != nil {
+		*resp = CredentialsGetResponse{
+			Error: err.Error(),
+		}
+		return nil
+	}
+
+	*resp = CredentialsGetResponse{
+		Username: username,
+		Password: password,
+	}
+	return nil
+}
+
+func (p *credentialsPlugin) Add(c *credentials.Credentials, resp *string) error {
+	err := p.helper.Add(c)
+	if err != nil {
+		*resp = err.Error()
+	}
+	return nil
+}
+
+func (p *credentialsPlugin) Delete(c *credentials.Credentials, resp *string) error {
+	err := p.helper.Delete(c.ServerURL)
+	if err != nil {
+		*resp = err.Error()
+	}
+	return nil
+}