initial core commit

internal/handler/handlers.go

@@ -0,0 +1,60 @@
+package handler
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v5"
+)
+
+// Health returns basic service health
+func Health(c *gin.Context) {
+	c.JSON(http.StatusOK, gin.H{"status": "ok"})
+}
+
+// Hello returns a simple greeting
+func Hello(c *gin.Context) {
+	c.JSON(http.StatusOK, gin.H{"message": "hello from lambda-iot core"})
+}
+
+// Login issues a JWT token for demo purposes
+func Login(c *gin.Context) {
+	var req struct {
+		Username string `json:"username"`
+		Password string `json:"password"`
+	}
+	if err := c.BindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid json"})
+		return
+	}
+	// demo credentials
+	if req.Username != "admin" || req.Password != "password" {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "invalid credentials"})
+		return
+	}
+	// create token
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
+		"sub": req.Username,
+		"exp": time.Now().Add(time.Hour).Unix(),
+	})
+	secret := "secret"
+	if s := c.GetHeader("X-JWT-SECRET"); s != "" {
+		secret = s
+	}
+	signed, err := token.SignedString([]byte(secret))
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "could not sign token"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"token": signed})
+}
+
+// Protected requires a valid JWT and returns the token claims
+func Protected(c *gin.Context) {
+	if v, ok := c.Get("claims"); ok {
+		c.JSON(http.StatusOK, gin.H{"claims": v})
+		return
+	}
+	c.JSON(http.StatusUnauthorized, gin.H{"error": "no claims"})
+}

internal/handler/handlers_test.go

@@ -0,0 +1,87 @@
+package handler
+
+import (
+	"encoding/json"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v5"
+)
+
+func TestHealth(t *testing.T) {
+	r := gin.New()
+	r.GET("/health", Health)
+
+	req := httptest.NewRequest("GET", "/health", nil)
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+	if w.Code != 200 {
+		t.Fatalf("expected 200 got %d", w.Code)
+	}
+	var body map[string]string
+	if err := json.NewDecoder(w.Body).Decode(&body); err != nil {
+		t.Fatalf("decode: %v", err)
+	}
+	if body["status"] != "ok" {
+		t.Fatalf("unexpected body: %#v", body)
+	}
+}
+
+func TestHello(t *testing.T) {
+	r := gin.New()
+	r.GET("/hello", Hello)
+
+	req := httptest.NewRequest("GET", "/hello", nil)
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+	if w.Code != 200 {
+		t.Fatalf("expected 200 got %d", w.Code)
+	}
+	var body map[string]string
+	if err := json.NewDecoder(w.Body).Decode(&body); err != nil {
+		t.Fatalf("decode: %v", err)
+	}
+	if body["message"] == "" {
+		t.Fatalf("unexpected body: %#v", body)
+	}
+}
+
+func TestLoginAndProtected(t *testing.T) {
+	secret := "testsecret"
+	// create token
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
+		"sub": "tester",
+		"exp": time.Now().Add(time.Hour).Unix(),
+	})
+	signed, err := token.SignedString([]byte(secret))
+	if err != nil {
+		t.Fatalf("sign token: %v", err)
+	}
+
+	// test protected route
+	r := gin.New()
+	// use middleware inline for test
+	r.Use(func(c *gin.Context) {
+		c.Request.Header.Set("Authorization", "Bearer "+signed)
+	})
+	r.GET("/protected", func(c *gin.Context) {
+		c.Set("claims", jwt.MapClaims{"sub": "tester"})
+		Protected(c)
+	})
+
+	req := httptest.NewRequest("GET", "/protected", nil)
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+	if w.Code != 200 {
+		t.Fatalf("expected 200 got %d", w.Code)
+	}
+	var body map[string]interface{}
+	if err := json.NewDecoder(w.Body).Decode(&body); err != nil {
+		t.Fatalf("decode: %v", err)
+	}
+	if body["claims"] == nil {
+		t.Fatalf("expected claims in response")
+	}
+}

internal/middleware/auth.go

@@ -0,0 +1,42 @@
+package middleware
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v5"
+)
+
+// AuthMiddleware validates a JWT token from the Authorization header
+func AuthMiddleware(secret string) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		auth := c.GetHeader("Authorization")
+		if auth == "" {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "missing authorization header"})
+			return
+		}
+		parts := strings.SplitN(auth, " ", 2)
+		if len(parts) != 2 || strings.ToLower(parts[0]) != "bearer" {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "invalid authorization header"})
+			return
+		}
+		tokenStr := parts[1]
+		token, err := jwt.Parse(tokenStr, func(t *jwt.Token) (interface{}, error) {
+			// ensure signing method is HMAC
+			if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
+				return nil, jwt.ErrTokenUnverifiable
+			}
+			return []byte(secret), nil
+		})
+		if err != nil || !token.Valid {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "invalid token"})
+			return
+		}
+		// expose token claims to handlers
+		if claims, ok := token.Claims.(jwt.MapClaims); ok {
+			c.Set("claims", claims)
+		}
+		c.Next()
+	}
+}

internal/middleware/logging.go

@@ -0,0 +1,23 @@
+package middleware
+
+import (
+	"log"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+// GinLogger returns a middleware that logs requests using the standard logger
+func GinLogger() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		start := time.Now()
+		c.Next()
+		latency := time.Since(start)
+		status := c.Writer.Status()
+		if len(c.Errors) > 0 {
+			log.Printf("error: method=%s path=%s status=%d latency=%s errs=%s", c.Request.Method, c.Request.URL.Path, status, latency.String(), c.Errors.String())
+			return
+		}
+		log.Printf("method=%s path=%s status=%d latency=%s", c.Request.Method, c.Request.URL.Path, status, latency.String())
+	}
+}