Metadata-Version: 2.1
Name: xargs
Version: 0.5.0
Summary: Binding form data validation framework.
Home-page: https://github.com/marcohong/xform
Author: Maco
Author-email: macohong@hotmail.com
License: MIT License
Keywords: Form validation,Data Binding,Tornado web,aiohttp web,Sanic web
Classifier: Development Status :: 4 - Beta
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: MIT License
Classifier: Topic :: Software Development
Classifier: Topic :: Software Development :: Libraries
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Operating System :: OS Independent
Classifier: Framework :: AsyncIO
Requires-Python: >=3.6
Description-Content-Type: text/markdown
License-File: LICENSE

#### xform
表单数据绑定验证框架，支持Tornado(默认)、aiohttp、sanic、flask，可自行扩展支持其它的python web框架

------

#### 版本要求

------

目前已支持的web框架

| Web框架          | Python版本    | 备注                           |
| ---------------- | ------------- | ------------------------------ |
| Tornado >= 6.0.0 | python >= 3.6 |                                |
| Aiohttp >= 3.6.0 | python >= 3.7 | aiohttp对python最低支持版本3.7 |
| Sanic >= 19.3    | python >= 3.6 |                                |
| Flask>=2.0.1     | python >= 3.6 |                                |

#### 获取安装

```bash
# 已发布在pypi的地址
pip3 install xargs
pip3 install https://github.com/marcohong/xform/archive/v0.5.0.tar.gz
# 或者使用最新版本
pip3 install git+https://github.com/marcohong/xform.git
```

#### 使用示例

------

Flask示例，只支持2.0以上

```python
from flask import request
from flask import Flask
from xform.httputil import HttpRequest
from xform.adapters.flask import FlaskRequest #引入Flask的适配器
from xform.form import SubmitForm
from xform import fields
HttpRequest.configure(request_proxy=FlaskRequest) # 全局设置Request的代理为FlaskRequest

app = Flask(__name__)

# 表单声明(也可以使用继承Form实现)
form = SubmitForm(
    id=fields.Integer(required=True, _min=1),
    name=fields.Str(required=True, length=(3, 20))
)

@app.route('/', methods=['GET', 'POST'])
async def index():
    # 注意表单之前获取过body数据可能会影响get_data取不到数据(因为缓冲区数据已被flask删除)
    # locations:获取数据方式仅限于指定的作用域，locations可以是str或者tuple
    # 作用域: form/json/query/headers/cookies，组合使用例如locations=('form','json')
    # data, error = await self.form.bind(self, locations='json')
    data, error = await form.bind(request)
    if error:
        return {'error': error}
    return {'data': data}

if __name__ == '__main__':
    app.run(port=8888)

# curl -X POST http://127.0.0.1:8888/ -d '{"id": 12, "name": "hello1"}' -H "Content-type: application/json"
# curl -X POST http://127.0.0.1:8888/ -d 'id=2&name=hello2'
# curl http://127.0.0.1:8888/\?id\=12\&name\=hello3
```

Tornado示例，更多demo请查看examples文件夹

```python
from xform import fields
from xform import schema
from xform.form import SubmitForm

# 使用Schema可结合fields.Nested嵌套对象，支持多层嵌套对象
class UserSchema(schema.Schema):
    uid = fields.Integer(required=True)
    name = fields.Username(required=True, length=(4, 20))
    # group = fields.Nested(GroupSchema)

form = SubmitForm(
        id=fields.Integer(required=True, _min=1),
        name=fields.Str(required=True),
        # when_field 当表单某一个字段的值在when_value中定义 则强制变为必填(required=True)
        password = fields.Password(required=False, when_field='id', when_value=lambda x: x and int(x) > 10)
        # 如果表单提交类型的是json按照字典方式传值即可，否则使用user.uid=xxx方式传值
        user=fields.Nested(UserSchema, required=False)
)

async def index():
    data, error = await form.bind(self)
  
# curl http://localhost:8888 -X POST -d "id=1&name=test&user.name=user&user.uid=2"
```

自定义的提示(3种方式)

```python
'''
1.替换提示内容
'''
from xform.messages import ErrMsg
# ErrMsg.set_messages在导入fields/validator之前执行
ErrMsg.set_messages({'invalid_start_date': 'time invalid'})
from xform import fields

'''
2.使用国际化文件message.po
默认情况下是使用tornado的locale.translate('xxx')
请把messages.py定义的value翻译即可，例如:
msgid "Length must be between %s and %s" (注意%s不能少)
msgstr "长度必须在%s到%s之间"
'''
from xform import fields
# coding...

'''
3.替换提示内容，后再使用国际化，请根据第1步在导入fields/validator之前设置，
国际化文件message.po定义相对应替换后的内容即可
'''


```

demo

```bash
cd examples/
# test tornado
python3 test_tornado.py
# test aiohttp web
python3 test_aiohttp.py
# test sanic web
python3 test_sanic.py
...

```

#### 扩展组件

------

##### 自定义fields类型

```python
import re
from typing import Optional, Any
from xform.fields import Integer, Str, VALUE_TYPES
from xform.form import SubmitForm
'''
实现_validate方法即可，如果返回值需要转换则重写get_value方法
'''
class UserField(Integer):
    # 不需要转换，因为返回值是一个缓存对象
    cvt_type = None

    def add_err_msg(self) -> None:
        self.err_msg.update({'not_exist': 'User does not exist'})

    async def _validate(self,
                        value: VALUE_TYPES,
                        attr: str,
                        data: dict) -> Optional[dict]:
        # 假设UserCache.get返回的是一个缓存对象
        data = await UserCache.get(value)
        # 错误时调用self.set_error('xxx')设置错误提示语，不需要返回内容，成功时返回内容
        if not data:
            self.set_error('not_exist')
        else:
            # 返回的是缓存对象
            return data

class OrderNOField(Str):
    regex = r'^[a-zA-Z0-9_]+$'

    def add_err_msg(self) -> None:
        self.err_msg.update({'invalid': 'Invalid order'})

    def __init__(self,
                 *,
                 length: tuple = 20,
                 **kwargs: Any):
        kwargs['length'] = length
        super().__init__(**kwargs)

    async def _validate(self,
                        value: VALUE_TYPES,
                        attr: str,
                        data: dict) -> Optional[str]:
        ret = re.match(self.regex, value)
        if not ret:
            self.set_error('invalid')
            return
        return value

# user_id是表单提交的字段(data_key是可选的，如果为空则使用user作为表单字段)
form = SubmitForm(
    user=UserField(data_key='user_id', required=True),
    order_no=OrderNOField(required=True)
)
```

##### 自定义的validator验证

```python
from xform.fields import Str
from xform.validate import Validator, ValidationError
#参考OneOf
class OneOf(Validator):
    default_message = ErrMsg.get_message('invalid_option')

    def __init__(self, choices: Union[list, tuple], error: str = None):
        self.choices = choices
        self.error = error or self.default_message

    def __call__(self, value: Union[str, int]):
        '''
        call方法实现逻辑
        '''
        if value is None or value not in self.choices:
            # 验证错误时请抛出ValidationError错误
            raise ValidationError(self.error)
        return value

# 使用validate
form = SubmitForm(
    tag=Str(required=True, validate=OneOf(('bule', 'red', 'green')))
)
```

##### 其它web框架支持

```python
'''
Tornado为例
'''
from xform.httputil import BaseRequest
class TornadoRequest(BaseRequest):
    def __init__(self, request):
        super().__init__(request)

    def get_argument(self,
                     name: str,
                     default: Any = None) -> Optional[str]:
        return self.request.get_argument(name, default=default)

    def get_from_header(self,
                        name: str,
                        default: Any = None) -> Optional[dict]:
        return self.request.request.headers.get(name, default)

    def translate(self, message: str) -> str:
        return self.request.locale.translate(message)
    # ...实现BaseRequest里面的方法，
    # 详细实现请参考xform.adapters.tornado.TornadoRequest

# 启动web服务前设置一下xform的request代理(不设置默认Tornado)，以aiohttp为例
from xform.httputil import HttpRequest
from xform.adapters.aiohttp import AioHttpRequest
HttpRequest.configure(request_proxy=AioHttpRequest)
# Coding...
```

#### License

------

`xfrom` is offered under the MIT license.

