feat: complete API-driven projects with infrastructure and business acceptance

examples/userService/internal/middleware/auth.go

@@ -0,0 +1,40 @@
+package middleware
+
+import (
+	"crypto/sha256"
+	"crypto/subtle"
+	"errors"
+	apierrors "git.yuntuo.hk/k2safe/go-omni/errors"
+	"git.yuntuo.hk/k2safe/go-omni/httpx"
+	"os"
+	"strings"
+)
+
+// Auth is the fail-closed registry default. Startup replaces it with configured
+// authentication. This administrative example uses one environment-only key;
+// production applications can inject JWT/OIDC through the same middleware slot.
+func Auth(next httpx.Handler) httpx.Handler {
+	return func(c *httpx.Context) error {
+		return apierrors.Unauthorized("UNAUTHENTICATED", "authentication required")
+	}
+}
+func NewAuthFromEnv() (httpx.Middleware, error) {
+	token := os.Getenv("USER_SERVICE_API_TOKEN")
+	if len(token) < 32 || strings.ContainsAny(token, " \t\r\n") {
+		return nil, errors.New("USER_SERVICE_API_TOKEN requires at least 32 bytes without whitespace")
+	}
+	expected := sha256.Sum256([]byte(token))
+	return func(next httpx.Handler) httpx.Handler {
+		return func(c *httpx.Context) error {
+			parts := strings.Fields(c.Header("Authorization"))
+			if len(parts) != 2 || !strings.EqualFold(parts[0], "Bearer") {
+				return apierrors.Unauthorized("UNAUTHENTICATED", "authentication required")
+			}
+			actual := sha256.Sum256([]byte(parts[1]))
+			if subtle.ConstantTimeCompare(expected[:], actual[:]) != 1 {
+				return apierrors.Unauthorized("UNAUTHENTICATED", "authentication required")
+			}
+			return next(c)
+		}
+	}, nil
+}