fix: harden handler context and rate limit isolation

internal/api/handler/context_guard_test.go

@@ -0,0 +1,95 @@
+package handler
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+)
+
+func init() {
+	gin.SetMode(gin.TestMode)
+}
+
+func TestSSOHandlerAuthorize_InvalidContextTypes_ReturnsUnauthorized(t *testing.T) {
+	h := &SSOHandler{}
+	engine := gin.New()
+	engine.GET("/authorize", func(c *gin.Context) {
+		c.Set("user_id", "not-int64")
+		c.Set("username", 123)
+		h.Authorize(c)
+	})
+
+	req := httptest.NewRequest(http.MethodGet, "/authorize?client_id=test-client&redirect_uri=https://example.com/callback&response_type=code", nil)
+	w := httptest.NewRecorder()
+	engine.ServeHTTP(w, req)
+
+	if w.Code != http.StatusUnauthorized {
+		t.Fatalf("expected 401, got %d", w.Code)
+	}
+}
+
+func TestSSOHandlerUserInfo_InvalidContextTypes_ReturnsUnauthorized(t *testing.T) {
+	h := &SSOHandler{}
+	engine := gin.New()
+	engine.GET("/userinfo", func(c *gin.Context) {
+		c.Set("user_id", "not-int64")
+		c.Set("username", 123)
+		h.UserInfo(c)
+	})
+
+	req := httptest.NewRequest(http.MethodGet, "/userinfo", nil)
+	w := httptest.NewRecorder()
+	engine.ServeHTTP(w, req)
+
+	if w.Code != http.StatusUnauthorized {
+		t.Fatalf("expected 401, got %d", w.Code)
+	}
+}
+
+func TestWebhookHandlerCreateWebhook_InvalidContextType_ReturnsUnauthorized(t *testing.T) {
+	h := &WebhookHandler{}
+	engine := gin.New()
+	engine.POST("/webhooks", func(c *gin.Context) {
+		c.Set("user_id", "not-int64")
+		h.CreateWebhook(c)
+	})
+
+	body, err := json.Marshal(map[string]any{
+		"name":   "test",
+		"url":    "https://example.com/webhook",
+		"events": []string{"user.created"},
+	})
+	if err != nil {
+		t.Fatalf("marshal request: %v", err)
+	}
+
+	req := httptest.NewRequest(http.MethodPost, "/webhooks", bytes.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	engine.ServeHTTP(w, req)
+
+	if w.Code != http.StatusUnauthorized {
+		t.Fatalf("expected 401, got %d", w.Code)
+	}
+}
+
+func TestWebhookHandlerListWebhooks_InvalidContextType_ReturnsUnauthorized(t *testing.T) {
+	h := &WebhookHandler{}
+	engine := gin.New()
+	engine.GET("/webhooks", func(c *gin.Context) {
+		c.Set("user_id", "not-int64")
+		h.ListWebhooks(c)
+	})
+
+	req := httptest.NewRequest(http.MethodGet, "/webhooks?page=1&page_size=20", nil)
+	w := httptest.NewRecorder()
+	engine.ServeHTTP(w, req)
+
+	if w.Code != http.StatusUnauthorized {
+		t.Fatalf("expected 401, got %d", w.Code)
+	}
+}