Config UI: add redirect uri suggestion service (#25478)

server/network/registry.go

@@ -1,33 +0,0 @@
-package network
-
-import (
-	"sync"
-
-	"github.com/evcc-io/evcc/api/globalconfig"
-)
-
-var (
-	mu       sync.Mutex
-	registry []func()
-)
-
-var config globalconfig.Network
-
-func Config() globalconfig.Network {
-	return config
-}
-
-func Register(fun func()) {
-	mu.Lock()
-	defer mu.Unlock()
-
-	registry = append(registry, fun)
-}
-
-func Start(conf globalconfig.Network) {
-	config = conf
-
-	for _, fun := range registry {
-		go fun()
-	}
-}

server/network/service.go

@@ -0,0 +1,34 @@
+package network
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/evcc-io/evcc/api/globalconfig"
+	"github.com/evcc-io/evcc/server/service"
+)
+
+var config globalconfig.Network
+
+const CallbackPath = "/providerauth/callback"
+
+func init() {
+	// auth service is registered here to avoid import cycle
+	mux := http.NewServeMux()
+	mux.HandleFunc("GET /redirecturi", getRedirectUri)
+
+	service.Register("auth", mux)
+}
+
+func Start(conf globalconfig.Network) {
+	config = conf
+}
+
+func Config() globalconfig.Network {
+	return config
+}
+
+func getRedirectUri(w http.ResponseWriter, req *http.Request) {
+	uri := config.ExternalURL() + CallbackPath
+	json.NewEncoder(w).Encode([]string{uri})
+}