### Get Authorization URL

Source: https://github.com/yifangyun/fangcloud-python-sdk/blob/master/README.md

Generates the authorization URL required for the OAuth 2.0 flow. Ensure YfyInit.init_system has been called prior to this.

```python
from fangcloud.oauth import FangcloudOAuth2FlowBase
from fangcloud.yifangyun import YfyInit
YfyInit.init_system("YOUR_CLIENT_ID", "YOUR_CLIENT_SECRET")
state = utils.generate_new_state()
oauth = FangcloudOAuth2FlowBase()
authorize_url = oauth.get_authorize_url("YOUR_REDIRECT_URL", state)
```

--------------------------------

### Get File Information

Source: https://github.com/yifangyun/fangcloud-python-sdk/blob/master/README.md

Retrieves information about a specific file using its ID. This snippet demonstrates how to call the get_file_info method on the file client.

```python
file_info = yfy_client.file().get_file_info(file_id)
print('file_name: '+file_info['name'])
```

--------------------------------

### Get Fangcloud Client Instance

Source: https://github.com/yifangyun/fangcloud-python-sdk/blob/master/README.md

Obtains a client instance for interacting with Fangcloud APIs. The first call requires user ID, access token, and refresh token. Subsequent calls can use just the user ID to reuse the client.

```python
from fangcloud.yifangyun import YfyClientFactory
YfyInit.init_system("YOUR_CLIENT_ID", "YOUR_CLIENT_SECRET")
yfy_client = YfyClientFactory.get_client_instance("YOUR-USER-ID", access_token, refresh_token)
```

```python
yfy_client = YfyClientFactory.get_client_instance("YOUR-USER-ID")
```

--------------------------------

### JWT: Get User OAuth Token

Source: https://github.com/yifangyun/fangcloud-python-sdk/blob/master/README.md

Obtains a user access token and refresh token using JWT authentication. Requires your private key and user/KID details.

```python
from fangcloud.oauth import FangcloudOAuth2FlowBase
from fangcloud.yifangyun import YfyInit
YfyInit.init_system("YOUR_CLIENT_ID", "YOUR_CLIENT_SECRET")
oauth = FangcloudOAuth2FlowBase()
private_key = open("YOUR_PRIVATE_KEY_PATH", "r").read()

# 获取用户token
jwt_user_login = oauth.jwt_user_login("YOUR_USER_ID", "KID", private_key)
user_access_token, user_refresh_token = jwt_user_login.access_token, jwt_user_login.refresh_token
```

--------------------------------

### JWT: Get Enterprise OAuth Token

Source: https://github.com/yifangyun/fangcloud-python-sdk/blob/master/README.md

Obtains an enterprise access token and refresh token using JWT authentication. Requires your private key and enterprise/KID details.

```python
from fangcloud.oauth import FangcloudOAuth2FlowBase
from fangcloud.yifangyun import YfyInit
YfyInit.init_system("YOUR_CLIENT_ID", "YOUR_CLIENT_SECRET")
oauth = FangcloudOAuth2FlowBase()
private_key = open("YOUR_PRIVATE_KEY_PATH", "r").read()

# 获取企业token
jwt_enterprise_login = oauth.jwt_enterprise_login("YOUR_ENTERPRISE_ID", "KID", private_key)
enterprise_access_token, enterprise_refresh_token = jwt_enterprise_login.access_token, jwt_enterprise_login.refresh_token
```

--------------------------------

### Initialize Fangcloud SDK

Source: https://github.com/yifangyun/fangcloud-python-sdk/blob/master/README.md

Initializes the Fangcloud SDK system with your application's client ID and client secret. This must be called before using other SDK functionalities.

```python
from fangcloud.yifangyun import YfyInit
YfyInit.init_system("YOUR_CLIENT_ID", "YOUR_CLIENT_SECRET")
```

--------------------------------

### Web Demo: Initiate Authorization

Source: https://github.com/yifangyun/fangcloud-python-sdk/blob/master/README.md

A handler class from the web-demo that initiates the OAuth authorization process by generating a state and redirecting the user to the authorization URL.

```python
class AuthStartHandler(BasicHandler):

    def post(self, *args, **kwargs):
        username = self.get_login_user()
        user = self.__database__.get_user(username)
	    #check user login
        if user is None:
            response_page = utils.build_page("Error", "Nobody is logged in.")
            self.write(response_page)
            return

        # create a random stats, used for CSRF or remember web service current stats
        state = utils.generate_new_state()
        # the state can be stored in session
        self.set_state(state)
        # use SDK to fetch authorized url
        authorize_url = self.__oauth__.get_authorize_url(Config.redirect_url, state)
        self.redirect(authorize_url)
```

--------------------------------

### Web Demo: Handle Authorization Callback

Source: https://github.com/yifangyun/fangcloud-python-sdk/blob/master/README.md

A handler class from the web-demo that processes the callback from the authorization server, validates the state, and exchanges the authorization code for tokens.

```python
class AuthFinishHandler(BasicHandler):

    def get(self):
        code = self.get_argument("code", None)
        state = self.get_argument("state", None)
        username = self.get_login_user()
        user = self.__database__.get_user(username)
        if user is None:
            response_page = utils.build_page("Error", "Nobody is logged in.")
            self.write(response_page)
            return

        # check state
        state_in_session = self.get_state()
        if state != state_in_session:
            self.send_error(400, reason="Wrong state received")
        try:
            result = self.__oauth__.authenticate(code, Config.redirect_url)
        except OAuthCodeParamError:
            self.send_error(400, reason="Wrong oauth code to fetch oauth token")
            return
        except OAuthRedirectParamError:
            self.send_error(400, reason="Wrong oauth redirect url to fetch oauth")
            return
        self.write(str(result))
```

--------------------------------

### Authenticate with Authorization Code

Source: https://github.com/yifangyun/fangcloud-python-sdk/blob/master/README.md

Exchanges an authorization code for an access token and refresh token. This is a crucial step after the user has authorized your application.

```python
oauth.FangcloudOAuth2FlowBase()
result = oauth.authenticate('YOUR_AUTH_CODE')
access_token, refresh_token = result.access_token, result.refresh_token
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.