Add remote access (#28688)

server/http_remote_handler.go

@@ -0,0 +1,62 @@
+package server
+
+import (
+	"encoding/json"
+	"net/http"
+	"time"
+
+	"github.com/evcc-io/evcc/server/remote"
+)
+
+// remoteClientsHandler returns the list of remote tunnel clients.
+func remoteClientsHandler(r *remote.Remote) http.HandlerFunc {
+	return func(w http.ResponseWriter, _ *http.Request) {
+		jsonWrite(w, r.Clients())
+	}
+}
+
+// createRemoteClientHandler creates a new tunnel client and returns the
+// cleartext password (shown to the user only once).
+func createRemoteClientHandler(r *remote.Remote) http.HandlerFunc {
+	return func(w http.ResponseWriter, req *http.Request) {
+		var body struct {
+			Username  string `json:"username"`
+			ExpiresIn int64  `json:"expiresIn"` // seconds; 0 = never
+		}
+		if err := json.NewDecoder(req.Body).Decode(&body); err != nil {
+			jsonError(w, http.StatusBadRequest, err)
+			return
+		}
+
+		client, password, err := r.CreateClient(body.Username, time.Duration(body.ExpiresIn)*time.Second)
+		if err != nil {
+			jsonError(w, http.StatusBadRequest, err)
+			return
+		}
+
+		jsonWrite(w, struct {
+			Username  string     `json:"username"`
+			Password  string     `json:"password"`
+			CreatedAt time.Time  `json:"createdAt"`
+			ExpiresAt *time.Time `json:"expiresAt,omitempty"`
+		}{
+			Username:  client.Username,
+			Password:  password,
+			CreatedAt: client.CreatedAt,
+			ExpiresAt: client.ExpiresAt,
+		})
+	}
+}
+
+// deleteRemoteClientHandler removes a tunnel client by username.
+// Username is passed as a query parameter to allow arbitrary characters.
+func deleteRemoteClientHandler(r *remote.Remote) http.HandlerFunc {
+	return func(w http.ResponseWriter, req *http.Request) {
+		username := req.URL.Query().Get("username")
+		if err := r.DeleteClient(username); err != nil {
+			jsonError(w, http.StatusNotFound, err)
+			return
+		}
+		jsonWrite(w, true)
+	}
+}