Feat: Add http api to create, update, or delete agents. (#7515)

### What problem does this PR solve?

Hello, we are using ragflow as a backend service, so we need to manage
agents from our own frontend. So adding these http APIs to manage
agents.

The code logic is copied and modified from the `rm` and `save` methods
in `api/apps/canvas_app.py`.

btw, I found that the `save` method in `canvas_app.py` actually allows
to modify an agent to an existing title, so I kept the behavior in the
http api. I'm not sure if this is intentional.

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [x] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

api/apps/sdk/agent.py

 #  limitations under the License.
 #
 
+import json
+import time
+from typing import Any, cast
 from api.db.services.canvas_service import UserCanvasService
-from api.utils.api_utils import get_error_data_result, token_required
+from api.db.services.user_canvas_version import UserCanvasVersionService
+from api.settings import RetCode
+from api.utils import get_uuid
+from api.utils.api_utils import get_data_error_result, get_error_data_result, get_json_result, token_required
 from api.utils.api_utils import get_result
 from flask import request
 
         desc = True
     canvas = UserCanvasService.get_list(tenant_id,page_number,items_per_page,orderby,desc,id,title)
     return get_result(data=canvas)
+
+
+@manager.route("/agents", methods=["POST"])  # noqa: F821
+@token_required
+def create_agent(tenant_id: str):
+    req: dict[str, Any] = cast(dict[str, Any], request.json)
+    req["user_id"] = tenant_id
+
+    if req.get("dsl") is not None:
+        if not isinstance(req["dsl"], str):
+            req["dsl"] = json.dumps(req["dsl"], ensure_ascii=False)
+
+        req["dsl"] = json.loads(req["dsl"])
+    else:
+        return get_json_result(data=False, message="No DSL data in request.", code=RetCode.ARGUMENT_ERROR)
+
+    if req.get("title") is not None:
+        req["title"] = req["title"].strip()
+    else:
+        return get_json_result(data=False, message="No title in request.", code=RetCode.ARGUMENT_ERROR)
+
+    if UserCanvasService.query(user_id=tenant_id, title=req["title"]):
+        return get_data_error_result(message=f"Agent with title {req['title']} already exists.")
+
+    agent_id = get_uuid()
+    req["id"] = agent_id
+
+    if not UserCanvasService.save(**req):
+        return get_data_error_result(message="Fail to create agent.")
+
+    UserCanvasVersionService.insert(
+        user_canvas_id=agent_id,
+        title="{0}_{1}".format(req["title"], time.strftime("%Y_%m_%d_%H_%M_%S")),
+        dsl=req["dsl"]
+    )
+
+    return get_json_result(data=True)
+
+
+@manager.route("/agents/<agent_id>", methods=["PUT"])  # noqa: F821
+@token_required
+def update_agent(tenant_id: str, agent_id: str):
+    req: dict[str, Any] = {k: v for k, v in cast(dict[str, Any], request.json).items() if v is not None}
+    req["user_id"] = tenant_id
+
+    if req.get("dsl") is not None:
+        if not isinstance(req["dsl"], str):
+            req["dsl"] = json.dumps(req["dsl"], ensure_ascii=False)
+
+        req["dsl"] = json.loads(req["dsl"])
+    
+    if req.get("title") is not None:
+        req["title"] = req["title"].strip()
+
+    if not UserCanvasService.query(user_id=tenant_id, id=agent_id):
+        return get_json_result(
+            data=False, message="Only owner of canvas authorized for this operation.",
+            code=RetCode.OPERATING_ERROR)
+
+    UserCanvasService.update_by_id(agent_id, req)
+
+    if req.get("dsl") is not None:
+        UserCanvasVersionService.insert(
+            user_canvas_id=agent_id,
+            title="{0}_{1}".format(req["title"], time.strftime("%Y_%m_%d_%H_%M_%S")),
+            dsl=req["dsl"]
+        )
+
+        UserCanvasVersionService.delete_all_versions(agent_id)
+
+    return get_json_result(data=True)
+
+
+@manager.route("/agents/<agent_id>", methods=["DELETE"])  # noqa: F821
+@token_required
+def delete_agent(tenant_id: str, agent_id: str):
+    if not UserCanvasService.query(user_id=tenant_id, id=agent_id):
+        return get_json_result(
+            data=False, message="Only owner of canvas authorized for this operation.",
+            code=RetCode.OPERATING_ERROR)
+
+    UserCanvasService.delete_by_id(agent_id)
+    return get_json_result(data=True)

docs/references/http_api_reference.md

 
 ---
 
+### Create agent
+
+**POST** `/api/v1/agents`
+
+Create an agent.
+
+#### Request
+
+- Method: POST
+- URL: `/api/v1/agents`
+- Headers:
+  - `'Content-Type: application/json`
+  - `'Authorization: Bearer <YOUR_API_KEY>'`
+- Body:
+  - `"title"`: `string`
+  - `"description"`: `string`
+  - `"dsl"`: `object`
+
+##### Request example
+
+```bash
+curl --request POST \
+     --url http://{address}/api/v1/agents \
+     --header 'Content-Type: application/json' \
+     --header 'Authorization: Bearer <YOUR_API_KEY>' \
+     --data '{
+         "title": "Test Agent",
+         "description": "A test agent",
+         "dsl": {
+           // ... Canvas DSL here ...
+         }
+     }'
+```
+
+##### Request parameters
+
+- `title`: (*Body parameter*), `string`, *Required*  
+  The title of the agent.
+- `description`: (*Body parameter*), `string`  
+  The description of the agent. Defaults to `None`.
+- `dsl`: (*Body parameter*), `object`, *Required*  
+  The canvas DSL object of the agent.
+
+#### Response
+
+Success:
+
+```json
+{
+    "code": 0,
+    "data": true,
+    "message": "success"
+}
+```
+
+Failure:
+
+```json
+{
+    "code": 102,
+    "message": "Agent with title test already exists."
+}
+```
+
+---
+
+### Update agent
+
+**PUT** `/api/v1/agents/{agent_id}`
+
+Update an agent by id.
+
+#### Request
+
+- Method: PUT
+- URL: `/api/v1/agents/{agent_id}`
+- Headers:
+  - `'Content-Type: application/json`
+  - `'Authorization: Bearer <YOUR_API_KEY>'`
+- Body:
+  - `"title"`: `string`
+  - `"description"`: `string`
+  - `"dsl"`: `object`
+
+##### Request example
+
+```bash
+curl --request PUT \
+     --url http://{address}/api/v1/agents/58af890a2a8911f0a71a11b922ed82d6 \
+     --header 'Content-Type: application/json' \
+     --header 'Authorization: Bearer <YOUR_API_KEY>' \
+     --data '{
+         "title": "Test Agent",
+         "description": "A test agent",
+         "dsl": {
+           // ... Canvas DSL here ...
+         }
+     }'
+```
+
+##### Request parameters
+
+- `agent_id`: (*Path parameter*), `string`  
+  The id of the agent to be updated.
+- `title`: (*Body parameter*), `string`  
+  The title of the agent.
+- `description`: (*Body parameter*), `string`  
+  The description of the agent.
+- `dsl`: (*Body parameter*), `object`  
+  The canvas DSL object of the agent.
+
+Only specify the parameter you want to change in the request body. If a parameter does not exist or is `None`, it won't be updated.
+
+#### Response
+
+Success:
+
+```json
+{
+    "code": 0,
+    "data": true,
+    "message": "success"
+}
+```
+
+Failure:
+
+```json
+{
+    "code": 103,
+    "message": "Only owner of canvas authorized for this operation."
+}
+```
+
+---
+
+### Delete agent
+
+**DELETE** `/api/v1/agents/{agent_id}`
+
+Delete an agent by id.
+
+#### Request
+
+- Method: DELETE
+- URL: `/api/v1/agents/{agent_id}`
+- Headers:
+  - `'Content-Type: application/json`
+  - `'Authorization: Bearer <YOUR_API_KEY>'`
+
+##### Request example
+
+```bash
+curl --request DELETE \
+     --url http://{address}/api/v1/agents/58af890a2a8911f0a71a11b922ed82d6 \
+     --header 'Content-Type: application/json' \
+     --header 'Authorization: Bearer <YOUR_API_KEY>' \
+     --data '{}'
+```
+
+##### Request parameters
+
+- `agent_id`: (*Path parameter*), `string`  
+  The id of the agent to be deleted.
+
+#### Response
+
+Success:
+
+```json
+{
+    "code": 0,
+    "data": true,
+    "message": "success"
+}
+```
+
+Failure:
+
+```json
+{
+    "code": 103,
+    "message": "Only owner of canvas authorized for this operation."
+}
+```
+
+---

docs/references/python_api_reference.md

 
 ---
 
+### Create agent
 
+```python
+RAGFlow.create_agent(
+    title: str,
+    dsl: dict,
+    description: str | None = None
+) -> None
+```
+
+Create an agent.
+
+#### Parameters
+
+##### title: `str`
+
+Specifies the title of the agent.
+
+##### dsl: `dict`
+
+Specifies the canvas DSL of the agent.
+
+##### description: `str`
+
+The description of the agent. Defaults to `None`.
+
+#### Returns
+
+- Success: Nothing.
+- Failure: `Exception`.
+
+#### Examples
+
+```python
+from ragflow_sdk import RAGFlow
+rag_object = RAGFlow(api_key="<YOUR_API_KEY>", base_url="http://<YOUR_BASE_URL>:9380")
+rag_object.create_agent(
+  title="Test Agent",
+  description="A test agent",
+  dsl={
+    # ... canvas DSL here ...
+  }
+)
+```
+
+---
+
+### Update agent
+
+```python
+RAGFlow.update_agent(
+    agent_id: str,
+    title: str | None = None,
+    description: str | None = None,
+    dsl: dict | None = None
+) -> None
+```
+
+Update an agent.
+
+#### Parameters
+
+##### agent_id: `str`
+
+Specifies the id of the agent to be updated.
+
+##### title: `str`
+
+Specifies the new title of the agent. `None` if you do not want to update this.
+
+##### dsl: `dict`
+
+Specifies the new canvas DSL of the agent. `None` if you do not want to update this.
+
+##### description: `str`
+
+The new description of the agent. `None` if you do not want to update this.
+
+#### Returns
+
+- Success: Nothing.
+- Failure: `Exception`.
+
+#### Examples
+
+```python
+from ragflow_sdk import RAGFlow
+rag_object = RAGFlow(api_key="<YOUR_API_KEY>", base_url="http://<YOUR_BASE_URL>:9380")
+rag_object.update_agent(
+  agent_id="58af890a2a8911f0a71a11b922ed82d6",
+  title="Test Agent",
+  description="A test agent",
+  dsl={
+    # ... canvas DSL here ...
+  }
+)
+```
+
+---
+
+### Delete agent
+
+```python
+RAGFlow.delete_agent(
+    agent_id: str
+) -> None
+```
+
+Delete an agent.
+
+#### Parameters
+
+##### agent_id: `str`
+
+Specifies the id of the agent to be deleted.
+
+#### Returns
+
+- Success: Nothing.
+- Failure: `Exception`.
+
+#### Examples
+
+```python
+from ragflow_sdk import RAGFlow
+rag_object = RAGFlow(api_key="<YOUR_API_KEY>", base_url="http://<YOUR_BASE_URL>:9380")
+rag_object.delete_agent("58af890a2a8911f0a71a11b922ed82d6")
+```
+
+---

sdk/python/ragflow_sdk/ragflow.py

                 result_list.append(Agent(self, data))
             return result_list
         raise Exception(res["message"])
+
+    def create_agent(self, title: str, dsl: dict, description: str | None = None) -> None:
+        req = {
+            "title": title,
+            "dsl": dsl
+        }
+
+        if description is not None:
+            req["description"] = description
+
+        res = self.post("/agents", req)
+        res = res.json()
+
+        if res.get("code") != 0:
+            raise Exception(res["message"])
+
+    def update_agent(
+        self,
+        agent_id: str,
+        title: str | None = None,
+        description: str | None = None,
+        dsl: dict | None = None
+    ) -> None:
+        req = {}
+
+        if title is not None:
+            req["title"] = title
+
+        if description is not None:
+            req["description"] = description
+
+        if dsl is not None:
+            req["dsl"] = dsl
+
+        res = self.put(f"/agents/{agent_id}", req)
+        res = res.json()
+
+        if res.get("code") != 0:
+            raise Exception(res["message"])
+
+    def delete_agent(self, agent_id: str) -> None:
+        res = self.delete(f"/agents/{agent_id}", {})
+        res = res.json()
+
+        if res.get("code") != 0:
+            raise Exception(res["message"])