feat(platform): Agent 能力 - 扩展画布读取与模型路由能力

backend/internal/app/cloud_agent_contract_test.go

@@ -3,6 +3,8 @@ package app
 import (
 	"encoding/json"
 	"fmt"
+	"os"
+	"path/filepath"
 	"reflect"
 	"strings"
 	"testing"
@@ -366,6 +368,49 @@ func TestCloudAgentProjectionRejectsMissingAdapterAndOpaqueMetadata(t *testing.T
 	}
 }
 
+func TestCloudAgentTextResourceProjectionHidesLocator(t *testing.T) {
+	node := map[string]any{"id": "novel", "type": "text", "title": "小说原文"}
+	meta := map[string]any{"content": "/api/resources/novel-res/file", "storageKey": "resource:novel-res", "mimeType": "text/plain"}
+	descriptor, _ := cloudAgentNodeCapabilityForType("text")
+	projected, err := cloudAgentProjectNodeFields(node, meta, descriptor, descriptor.DetailFields, 16000, true, 0)
+	if err != nil || projected["content"] != nil || projected["contentAvailable"] != true || projected["contentSource"] != "resource" {
+		t.Fatalf("resource locator leaked or content availability missing: %v, %v", projected, err)
+	}
+}
+
+func TestCloudAgentReadTextLoadsOwnedResource(t *testing.T) {
+	s, db, _, _ := creationTestService(t)
+	content := "第一章\n林逸在石殿中醒来。"
+	objectKey := "users/user-1/file/novel.txt"
+	resource := model.Resource{ID: "novel-res", UserID: "user", Kind: "file", Status: model.ResourceStatusReady, Provider: "local", ObjectKey: objectKey, MimeType: "text/plain", Size: int64(len(content))}
+	if err := db.Create(&resource).Error; err != nil {
+		t.Fatal(err)
+	}
+	if err := os.MkdirAll(filepath.Join(s.dataDir, "resources", filepath.Dir(objectKey)), 0700); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(s.dataDir, "resources", objectKey), []byte(content), 0600); err != nil {
+		t.Fatal(err)
+	}
+	doc := map[string]any{"nodes": []map[string]any{{"id": "novel", "type": "text", "title": "小说原文", "metadata": map[string]any{"storageKey": "resource:novel-res", "content": "/api/resources/novel-res/file", "mimeType": "text/plain"}}}, "connections": []any{}}
+	raw, _ := json.Marshal(doc)
+	if err := db.Create(&model.CanvasProject{ID: "agent-canvas", UserID: "user", PayloadJSON: string(raw)}).Error; err != nil {
+		t.Fatal(err)
+	}
+	state := &cloudAgentRuntime{Request: CloudAgentRequest{CanvasID: "agent-canvas"}}
+	call := cloudAgentCall{ID: "read-text"}
+	call.Function.Name = "canvas_read_text"
+	call.Function.Arguments = `{"nodeId":"novel"}`
+	result, err := cloudAgentReadTool(s.repo, "user", state, call, s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	view, ok := result.(map[string]any)
+	if !ok || view["content"] != content || view["hasMore"] != false {
+		t.Fatalf("unexpected text resource result: %#v", result)
+	}
+}
+
 func TestCloudAgentCanvasStateBoundsDefaultBodyProjection(t *testing.T) {
 	body := strings.Repeat("长正文 ", 999) + "长正文"
 	doc := map[string]any{"nodes": []map[string]any{{"id": "markdown", "type": "markdown", "title": "长文档", "metadata": map[string]any{"content": body}}}, "connections": []map[string]any{}}