Http: add pluggable authentication and token (#20066)

plugin/auth/api.go

@@ -0,0 +1,7 @@
+package auth
+
+import "net/http"
+
+type Authorizer interface {
+	Transport(base http.RoundTripper) (http.RoundTripper, error)
+}

plugin/auth/config.go

@@ -0,0 +1,26 @@
+package auth
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	reg "github.com/evcc-io/evcc/util/registry"
+)
+
+var registry = reg.New[Authorizer]("auth")
+
+// NewFromConfig creates auth from configuration
+func NewFromConfig(ctx context.Context, typ string, other map[string]any) (Authorizer, error) {
+	factory, err := registry.Get(strings.ToLower(typ))
+	if err != nil {
+		return nil, err
+	}
+
+	v, err := factory(ctx, other)
+	if err != nil {
+		err = fmt.Errorf("cannot create auth type '%s': %w", typ, err)
+	}
+
+	return v, err
+}

plugin/auth/nop.go

@@ -0,0 +1,27 @@
+package auth
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/evcc-io/evcc/util"
+)
+
+type nop struct{}
+
+func init() {
+	registry.AddCtx("nop", NewNopFromConfig)
+}
+
+func NewNopFromConfig(ctx context.Context, other map[string]any) (Authorizer, error) {
+	var cc struct{}
+	if err := util.DecodeOther(other, &cc); err != nil {
+		return nil, err
+	}
+
+	return new(nop), nil
+}
+
+func (p *nop) Transport(base http.RoundTripper) (http.RoundTripper, error) {
+	return base, nil
+}