Flask 将 POST 参数传递给自定义装饰器

Question

I've seen the posts on passing GET parameters and hardcoded parameters here and here .

What I am trying to do is pass POST parameters to a custom decorator. The route is not actually rendering a page but rather processing some stuff and sending the results back through an AJAX call.

The decorator looks like this:

# app/util.py

from functools import wraps
from models import data

# custom decorator to validate symbol
def symbol_valid():
    def decorator(func):
        @wraps(func)
        def decorated_function(symbol, *args, **kwargs):
            if not data.validate_symbol(symbol):
                return jsonify({'status': 'fail'})
            return func(*args, **kwargs)
        return decorated_function
    return decorator

The view looks something like this:

# app/views/matrix_blueprint.py

from flask import Blueprint, request, jsonify

from ..models import data
from ..util import symbol_valid

matrix_blueprint = Blueprint('matrix_blueprint', __name__)

# routing for the ajax call to return symbol details
@matrix_blueprint.route('/route_line', methods=['POST'])
@symbol_valid
def route_line():
    symbol = request.form['symbol'].upper()
    result = data.get_information(symbol)
    return jsonify(**result)

I understand that I can actually call @symbol_valid() when I pass a parameter through GET like this /quote_line/<symbol> but I need to POST .

The question then is how can my decorator access the POST ed variable?

Answer 1

Simple solution. Imported Flask's request module into the util.py module which contains the decorator. Removed the outer function as well.

See code:

# app/util.py

from flask import request # <- added

from functools import wraps
from models import data

# custom decorator to validate symbol

def symbol_valid(func):
    @wraps(func)
    def decorated_function(*args, **kwargs): # <- removed symbol arg
        symbol = request.form['symbol'] # <- paramter is in the request object
        if not data.validate_symbol(symbol):
            return jsonify({'status': 'fail'})
        return func(*args, **kwargs)
    return symbol_valid

Answer 2

The decorator accept a func parameter. You must use your decorator like @symbol_valid() or make the function symbol_valid accept a func parameter.

If you are doing it right, you can access the request object anywhere during the request cycle. It just works.