Powerwall: add Fleet API support (BC) (#32410)

util/oauth/config.go

@@ -0,0 +1,45 @@
+package oauth
+
+import (
+	"errors"
+	"time"
+
+	"github.com/evcc-io/evcc/api"
+	"golang.org/x/oauth2"
+)
+
+// ClientCredentials contains OAuth2 client id and secret
+type ClientCredentials struct {
+	ID, Secret string
+}
+
+// Error validates the credentials and returns an error if they are incomplete
+func (c *ClientCredentials) Error() error {
+	if c.ID == "" {
+		return errors.New("missing client id")
+	}
+
+	if c.Secret == "" {
+		return errors.New("missing client secret")
+	}
+
+	return nil
+}
+
+// Tokens contains access and refresh tokens
+type Tokens struct {
+	Access, Refresh string
+}
+
+// Token builds token from credentials and returns an error if they are incomplete
+func (t *Tokens) Token() (*oauth2.Token, error) {
+	if t.Access == "" && t.Refresh == "" {
+		return nil, api.ErrMissingToken
+	}
+
+	return &oauth2.Token{
+		AccessToken:  t.Access,
+		RefreshToken: t.Refresh,
+		Expiry:       time.Now(),
+	}, nil
+}