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Description:

prerequest 2.1.5

This framework is designed to validate params for Restful api request.
We can validate complex struct and field, including Cross Field, Cross Struct

Install
you can simply install it by:
pip install pre-request

Document
Pre-request manual could be found at: https://pre-request.readthedocs.io/en/master/index.html

A Simple Example
This is very easy to use pre-request in your project
from flask import Flask

from pre_request import pre, Rule

app = Flask(__name__)

args = {
"userId": Rule(type=int, required=True)
}

@app.route("/")
@pre.catch(args)
def hello_world(params):
from flask import g
return str(params == g.params)
what happened in this code ?

Use pre-request library to import a global object pre
Define request params rule, userId must be type of int and required
Use @pre.catch(req_params) to filter input value
Use ~flask.g or def hello_world(params) to get formatted input value。

Complex Example
We use a very complex example to show the powerful of this framework
from flask import Flask
from pre_request import pre, Rule

args = {
"userFirst": {
"userId": Rule(type=int, required=False),
"socialInfo": {
"gender": Rule(type=int, enum=[1, 2], default=1),
"age": Rule(type=int, gte=18, lt=80),
"country": Rule(required=True, deep=False)
}
},
"userSecond": {
"userId": Rule(type=int, required=False, neq_key="userFirst.userId"),
"socialInfo": {
"gender": Rule(type=int, enum=[1, 2], default=1, neq_key="userFirst.socialInfo.gender"),
"age": Rule(type=int, gte=18, lt=80, required_with="userFirst.socialInfo.age"),
"country": Rule(required=True, deep=False)
}
}
}

app = Flask(__name__)
app.config["TESTING"] = True
client = app.test_client()

@app.route("/structure", methods=["GET", "POST"])
@pre.catch(args)
def structure_handler(params):
return str(params)

if __name__ == "__main__":
resp = app.test_client().post("/structure", json={
"userFirst": {
"userId": "13",
"socialInfo": {
"age": 20,
}
},
"userSecond": {
"userId": 14,
"socialInfo": {
"age": 21
}
},
"country": "CN",
"userFirst.socialInfo.gender": 1,
"userSecond.socialInfo.gender": 2,
})

print(resp.get_data(as_text=True))

Use parse
We can use function pre.parse instead of decorator @pre.catch()
args = {
"params": Rule(email=True)
}

@app.errorhandler(ParamsValueError)
def params_value_error(e):
return pre.fmt_resp(e)

@app.route("/index")
def example_handler():
rst = pre.parse(args)
return str(rst)

Contributing
How to make a contribution to Pre-request, see the contributing.

Coffee
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Links

Documentaion: https://pre-request.readthedocs.io/en/master/index.html
Release: https://pypi.org/project/pre-request/
Code: https://github.com/Eastwu5788/pre-request
Issue tracker: https://github.com/Eastwu5788/pre-request/issues
Test status: https://coveralls.io/github/Eastwu5788/pre-request