支持 S3 兼容对象存储 (#336)

* feat(storage): 支持 S3 对象存储

* fix(storage): 补齐 S3 对象文件后缀

backend/internal/handler/auth.go

@@ -477,6 +477,7 @@ func RegisterAdminRoutes(r *gin.RouterGroup, svc *service.Service) {
 			failService(c, err)
 			return
 		}
+		c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, 64<<10)
 		var req service.OSSSettingRequest
 		if err := c.ShouldBindJSON(&req); err != nil {
 			fail(c, http.StatusBadRequest, err)
@@ -489,6 +490,28 @@ func RegisterAdminRoutes(r *gin.RouterGroup, svc *service.Service) {
 		}
 		ok(c, gin.H{"setting": setting})
 	})
+	r.POST("/admin/settings/oss/test", func(c *gin.Context) {
+		user, err := currentUser(c, svc)
+		if err != nil {
+			failService(c, err)
+			return
+		}
+		if !enforceRateLimit(c, "admin-storage-test:"+user.ID, 6, time.Minute) {
+			return
+		}
+		c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, 64<<10)
+		var req service.OSSSettingRequest
+		if err := c.ShouldBindJSON(&req); err != nil {
+			fail(c, http.StatusBadRequest, err)
+			return
+		}
+		result, err := svc.TestAdminOSSSetting(user, req)
+		if err != nil {
+			failService(c, err)
+			return
+		}
+		ok(c, result)
+	})
 	r.GET("/admin/settings/ark-private-assets", func(c *gin.Context) {
 		user, err := currentUser(c, svc)
 		if err != nil {

backend/internal/handler/storage_routes_test.go

@@ -0,0 +1,32 @@
+package handler
+
+import (
+	"testing"
+
+	"infinite-canvas/backend/internal/service"
+
+	"github.com/gin-gonic/gin"
+)
+
+func TestStorageConnectionTestRoutesAreRegistered(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	group := router.Group("/api")
+	RegisterAdminRoutes(group, &service.Service{})
+	RegisterUserDataRoutes(group, &service.Service{})
+	wanted := map[string]bool{
+		"POST /api/admin/settings/oss/test": false,
+		"POST /api/settings/oss/test":       false,
+	}
+	for _, route := range router.Routes() {
+		key := route.Method + " " + route.Path
+		if _, exists := wanted[key]; exists {
+			wanted[key] = true
+		}
+	}
+	for route, found := range wanted {
+		if !found {
+			t.Errorf("route %s is not registered", route)
+		}
+	}
+}

backend/internal/handler/user_data.go

@@ -92,6 +92,28 @@ func RegisterUserDataRoutes(r *gin.RouterGroup, svc *service.Service) {
 		}
 		ok(c, gin.H{"setting": setting})
 	})
+	r.POST("/settings/oss/test", func(c *gin.Context) {
+		user, err := currentUser(c, svc)
+		if err != nil {
+			failService(c, err)
+			return
+		}
+		if !enforceRateLimit(c, "user-storage-test:"+user.ID, 6, time.Minute) {
+			return
+		}
+		c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, 64<<10)
+		var req service.OSSSettingRequest
+		if err := c.ShouldBindJSON(&req); err != nil {
+			fail(c, http.StatusBadRequest, err)
+			return
+		}
+		result, err := svc.TestUserOSSSetting(user, req)
+		if err != nil {
+			failService(c, err)
+			return
+		}
+		ok(c, result)
+	})
 	r.GET("/resources", func(c *gin.Context) {
 		user, err := currentUser(c, svc)
 		if err != nil {