Green Grid Compass: upgrade api (BC) (#26809)

plugin/auth/clientcredentials.go

@@ -0,0 +1,33 @@
+package auth
+
+import (
+	"context"
+	"errors"
+
+	"github.com/evcc-io/evcc/util"
+	"golang.org/x/oauth2"
+	"golang.org/x/oauth2/clientcredentials"
+)
+
+func init() {
+	registry.AddCtx("clientcredentials", NewClientcredentialsFromConfig)
+}
+
+func NewClientcredentialsFromConfig(ctx context.Context, other map[string]any) (oauth2.TokenSource, error) {
+	var cc clientcredentials.Config
+
+	if err := util.DecodeOther(other, &cc); err != nil {
+		return nil, err
+	}
+
+	switch {
+	case cc.ClientID == "":
+		return nil, errors.New("clientcredentials: missing required clientid")
+	case cc.ClientSecret == "":
+		return nil, errors.New("clientcredentials: missing required clientsecret")
+	case cc.TokenURL == "":
+		return nil, errors.New("clientcredentials: missing required tokenurl")
+	}
+
+	return cc.TokenSource(ctx), nil
+}