feat: add API token authentication

.env

@@ -0,0 +1,2 @@
+RCOND_ADDR=0.0.0.0:8080
+RCOND_API_TOKEN=your_api_token

Makefile

@@ -1,3 +1,4 @@
+SHELL := bash
 ARCH ?= arm64
 ADDR ?= 0.0.0.0:8080
 
@@ -10,10 +11,10 @@ build:
 	env GOOS=linux GOARCH=${ARCH} go build -o bin/rcond-${ARCH} ./cmd/rcond/main.go
 
 run:
-	bin/rcond-${ARCH} ${ADDR}
+	source .env && bin/rcond-${ARCH} ${ADDR}
 
 dev:
-	go run cmd/rcond/main.go ${ADDR}
+	RCOND_API_TOKEN=1234567890 go run cmd/rcond/main.go
 
 upload:
 	scp rcond-${ARCH} pi@rpi-40ac:/home/pi/rcond

README.md

@@ -1,13 +1,14 @@
 # rcond
 
-A simple daemon to manage network connections through NetworkManager's D-Bus interface.
+A simple daemon to manage 
+- network connections through NetworkManager's D-Bus interface
+- system hostname through the hostname1 service
 
 It provides a REST API to:
 - Create and activate WiFi connections
 - Deactivate WiFi connections 
 - Remove stored connection profiles
-
-The daemon is designed to run on Linux systems with NetworkManager.
+- Get and set the system hostname
 
 ## Build and Run
 
@@ -46,6 +47,7 @@ All endpoints use JSON for request and response payloads.
 ```bash
 curl -v -X POST http://localhost:8080/network/up \
   -H "Content-Type: application/json" \
+  -H "X-API-Token: 1234567890" \
   -d '{
     "interface": "wlan0",
     "ssid":      "MyNetworkSSID",
@@ -58,6 +60,7 @@ curl -v -X POST http://localhost:8080/network/up \
 ```bash
 curl -v -X POST http://localhost:8080/network/down \
   -H "Content-Type: application/json" \
+  -H "X-API-Token: 1234567890" \
   -d '{
     "interface": "wlan0"
   }'
@@ -66,13 +69,18 @@ curl -v -X POST http://localhost:8080/network/down \
 ### Remove the stored connection
 
 ```bash
-curl -v -X POST http://localhost:8080/network/remove
+curl -v -X POST http://localhost:8080/network/remove \
+  -H "X-API-Token: 1234567890" \
+  -d '{
+    "interface": "wlan0"
+  }'
 ```
 
 ### Get the hostname
 
 ```bash
-curl -v http://localhost:8080/hostname
+curl -v http://localhost:8080/hostname \
+  -H "X-API-Token: 1234567890"
 ```
 
 ### Set the hostname
@@ -80,6 +88,7 @@ curl -v http://localhost:8080/hostname
 ```bash
 curl -v -X POST http://localhost:8080/hostname \
   -H "Content-Type: application/json" \
+  -H "X-API-Token: 1234567890" \
   -d '{
     "hostname": "MyHostname"
   }'

api/rcond.yaml

@@ -8,6 +8,17 @@ servers:
   - url: http://localhost:8080
     description: Local development server
 
+components:
+  securitySchemes:
+    ApiKeyAuth:
+      type: apiKey
+      in: header
+      name: X-API-Token
+      description: API token for authentication
+
+security:
+  - ApiKeyAuth: []
+
 paths:
   /health:
     get:
@@ -57,6 +68,8 @@ paths:
           description: Network interface brought up successfully
         '400':
           description: Invalid request payload
+        '401':
+          description: Unauthorized - invalid or missing API token
         '500':
           description: Internal server error
 
@@ -82,6 +95,8 @@ paths:
           description: Network interface brought down successfully
         '400':
           description: Invalid request payload
+        '401':
+          description: Unauthorized - invalid or missing API token
         '500':
           description: Internal server error
 
@@ -92,6 +107,8 @@ paths:
       responses:
         '200':
           description: Connection profile removed successfully
+        '401':
+          description: Unauthorized - invalid or missing API token
         '500':
           description: Internal server error
 
@@ -108,6 +125,8 @@ paths:
                 type: string
                 description: Current hostname
                 example: "MyHostname"
+        '401':
+          description: Unauthorized - invalid or missing API token
         '500':
           description: Internal server error
     post:
@@ -131,6 +150,7 @@ paths:
           description: Hostname set successfully
         '400':
           description: Invalid request payload
+        '401':
+          description: Unauthorized - invalid or missing API token
         '500':
           description: Internal server error
-

cmd/rcond/main.go

@@ -1,4 +1,4 @@
-// Usage: rcond <address>
+// Usage: rcond <address> <api-token>
 
 package main
 
@@ -20,12 +20,17 @@ func usage() {
 }
 
 func main() {
-	if len(os.Args) < 2 {
-		usage()
+
+	addr := "0.0.0.0:8080"
+	if len(os.Args) > 1 {
+		addr = os.Args[1]
+	}
+	apiToken := os.Getenv("RCOND_API_TOKEN")
+	if apiToken == "" {
+		log.Fatal("RCOND_API_TOKEN environment variable not set")
 	}
 
-	addr := os.Args[1]
-	srv := http.NewServer(addr)
+	srv := http.NewServer(addr, apiToken)
 	srv.RegisterRoutes()
 
 	log.Printf("Starting server on %s", addr)

pkg/http/server.go

@@ -12,9 +12,10 @@ import (
 type Server struct {
 	router   *mux.Router
 	srv      *http.Server
+	apiToken string
 }
 
-func NewServer(addr string) *Server {
+func NewServer(addr string, apiToken string) *Server {
 	router := mux.NewRouter()
 
 	srv := &http.Server{
@@ -27,6 +28,7 @@ func NewServer(addr string) *Server {
 	return &Server{
 		router:   router,
 		srv:      srv,
+		apiToken: apiToken,
 	}
 }
 
@@ -38,13 +40,24 @@ func (s *Server) Shutdown(ctx context.Context) error {
 	return s.srv.Shutdown(ctx)
 }
 
+func (s *Server) verifyToken(next http.HandlerFunc) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		token := r.Header.Get("X-API-Token")
+		if token == "" || token != s.apiToken {
+			http.Error(w, "Unauthorized", http.StatusUnauthorized)
+			return
+		}
+		next(w, r)
+	}
+}
+
 func (s *Server) RegisterRoutes() {
 	s.router.HandleFunc("/health", s.healthHandler).Methods(http.MethodGet)
-	s.router.HandleFunc("/network/up", HandleNetworkUp).Methods(http.MethodPost)
-	s.router.HandleFunc("/network/down", HandleNetworkDown).Methods(http.MethodPost)
-	s.router.HandleFunc("/network/remove", HandleNetworkRemove).Methods(http.MethodPost)
-	s.router.HandleFunc("/hostname", HandleGetHostname).Methods(http.MethodGet)
-	s.router.HandleFunc("/hostname", HandleSetHostname).Methods(http.MethodPost)
+	s.router.HandleFunc("/network/up", s.verifyToken(HandleNetworkUp)).Methods(http.MethodPost)
+	s.router.HandleFunc("/network/down", s.verifyToken(HandleNetworkDown)).Methods(http.MethodPost)
+	s.router.HandleFunc("/network/remove", s.verifyToken(HandleNetworkRemove)).Methods(http.MethodPost)
+	s.router.HandleFunc("/hostname", s.verifyToken(HandleGetHostname)).Methods(http.MethodGet)
+	s.router.HandleFunc("/hostname", s.verifyToken(HandleSetHostname)).Methods(http.MethodPost)
 }
 
 func (s *Server) healthHandler(w http.ResponseWriter, r *http.Request) {