Support debug components. (#3994)

### What problem does this PR solve?

#3993

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

api/apps/canvas_app.py

@@ -187,10 +187,32 @@ def reset():
 
 
 @manager.route('/input_elements', methods=['GET'])  # noqa: F821
-@validate_request("id", "component_id")
 @login_required
 def input_elements():
+    cvs_id = request.args.get("id")
+    cpn_id = request.args.get("component_id")
+    try:
+        e, user_canvas = UserCanvasService.get_by_id(cvs_id)
+        if not e:
+            return get_data_error_result(message="canvas not found.")
+        if not UserCanvasService.query(user_id=current_user.id, id=cvs_id):
+            return get_json_result(
+                data=False, message='Only owner of canvas authorized for this operation.',
+                code=RetCode.OPERATING_ERROR)
+
+        canvas = Canvas(json.dumps(user_canvas.dsl), current_user.id)
+        return get_json_result(data=canvas.get_component_input_elements(cpn_id))
+    except Exception as e:
+        return server_error_response(e)
+
+
+@manager.route('/debug', methods=['POST'])  # noqa: F821
+@validate_request("id", "component_id", "params")
+@login_required
+def debug():
     req = request.json
+    for p in req["params"]:
+        assert p.get("key")
     try:
         e, user_canvas = UserCanvasService.get_by_id(req["id"])
         if not e:
@@ -201,7 +223,9 @@ def input_elements():
                 code=RetCode.OPERATING_ERROR)
 
         canvas = Canvas(json.dumps(user_canvas.dsl), current_user.id)
-        return get_json_result(data=canvas.get_component_input_elements(req["component_id"]))
+        canvas.get_component(req["component_id"])["obj"]._param.debug_inputs = req["params"]
+        df = canvas.get_component(req["component_id"])["obj"].debug()
+        return get_json_result(data=df.to_dict(orient="records"))
     except Exception as e:
         return server_error_response(e)