Feat: add code agent component (#7672)

### What problem does this PR solve?

Add code agent component.
#4977
### Type of change

- [x] New Feature (non-breaking change which adds functionality)

agent/component/__init__.py

 from .email import Email, EmailParam
 from .iteration import Iteration, IterationParam
 from .iterationitem import IterationItem, IterationItemParam
+from .code import Code, CodeParam
 
 
 def component_class(class_name):
     "TemplateParam",
     "Email",
     "EmailParam",
+    "Code",
+    "CodeParam",
     "component_class"
 ]

agent/component/code.py

+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+import base64
+from abc import ABC
+from enum import Enum
+from typing import Optional
+
+from pydantic import BaseModel, Field, field_validator
+
+from agent.component.base import ComponentBase, ComponentParamBase
+from api import settings
+
+
+class Language(str, Enum):
+    PYTHON = "python"
+    NODEJS = "nodejs"
+
+
+class CodeExecutionRequest(BaseModel):
+    code_b64: str = Field(..., description="Base64 encoded code string")
+    language: Language = Field(default=Language.PYTHON, description="Programming language")
+    arguments: Optional[dict] = Field(default={}, description="Arguments")
+
+    @field_validator("code_b64")
+    @classmethod
+    def validate_base64(cls, v: str) -> str:
+        try:
+            base64.b64decode(v, validate=True)
+            return v
+        except Exception as e:
+            raise ValueError(f"Invalid base64 encoding: {str(e)}")
+
+    @field_validator("language", mode="before")
+    @classmethod
+    def normalize_language(cls, v) -> str:
+        if isinstance(v, str):
+            low = v.lower()
+            if low in ("python", "python3"):
+                return "python"
+            elif low in ("javascript", "nodejs"):
+                return "nodejs"
+        raise ValueError(f"Unsupported language: {v}")
+
+
+class CodeParam(ComponentParamBase):
+    """
+    Define the code sandbox component parameters.
+    """
+
+    def __init__(self):
+        super().__init__()
+        self.lang = "python"
+        self.script = ""
+        self.arguments = []
+        self.address = f"http://{settings.SANDBOX_HOST}:9385/run"
+        self.enable_network = True
+
+    def check(self):
+        self.check_valid_value(self.lang, "Support languages", ["python", "python3", "nodejs", "javascript"])
+        self.check_defined_type(self.enable_network, "Enable network", ["bool"])
+
+
+class Code(ComponentBase, ABC):
+    component_name = "Code"
+
+    def _run(self, history, **kwargs):
+        arguments = {}
+        for input in self._param.arguments:
+            assert "@" in input["component_id"], "Each code argument should bind to a specific compontent"
+            component_id = input["component_id"].split("@")[0]
+            refered_component_key = input["component_id"].split("@")[1]
+            refered_component = self._canvas.get_component(component_id)["obj"]
+
+            for param in refered_component._param.query:
+                if param["key"] == refered_component_key:
+                    if "value" in param:
+                        arguments[input["name"]] = param["value"]
+
+        return self._execute_code(
+            language=self._param.lang,
+            code=self._param.script,
+            arguments=arguments,
+            address=self._param.address,
+            enable_network=self._param.enable_network,
+        )
+
+    def _execute_code(self, language: str, code: str, arguments: dict, address: str, enable_network: bool):
+        import requests
+
+        try:
+            code_b64 = self._encode_code(code)
+            code_req = CodeExecutionRequest(code_b64=code_b64, language=language, arguments=arguments).model_dump()
+        except Exception as e:
+            return Code.be_output("**Error**: construct code request error: " + str(e))
+
+        try:
+            resp = requests.post(url=address, json=code_req, timeout=10)
+            body = resp.json()
+            if body:
+                stdout = body.get("stdout")
+                stderr = body.get("stderr")
+                return Code.be_output(stdout or stderr)
+            else:
+                return Code.be_output("**Error**: There is no response from sanbox")
+
+        except Exception as e:
+            return Code.be_output("**Error**: Internal error in sanbox: " + str(e))
+
+    def _encode_code(self, code: str) -> str:
+        return base64.b64encode(code.encode("utf-8")).decode("utf-8")
+
+    def get_input_elements(self):
+        elements = []
+        for input in self._param.arguments:
+            cpn_id = input["component_id"]
+            elements.append({"key": cpn_id, "name": input["name"]})
+        return elements