将Flask中的URL还原为端点+参数 [英] Reverting a URL in Flask to the endpoint + arguments

问题描述

在Flask中解析URL以检索对端点的引用以及所有参数的字典的合适方法是什么?

What would be the appropriate way of resolving a URL within Flask to retrieve a reference to the endpoint as well as a dictionary of all the arguments?

举个例子，给定此路由，我想将'/user/nick'解析为 profile ， {'username':'尼克'} :

To provide an example, given this route, I'd like to resolve '/user/nick' to profile,{'username': 'nick'}:

@app.route('/user/<username>')
def profile(username): pass

到目前为止，根据我的研究，Flask中的所有路线都存储在 app.url_map 下.该地图是 werkzeug.routing.Map 的实例，并且具有方法match()原则上可以满足我的需求.但是，该方法是类的内部.

From my research so far, all routes in Flask are stored under app.url_map. The map is an instance of werkzeug.routing.Map and it has a method match() that would in principle do what I am looking for. However, that method is internal to the class.

推荐答案

为此，我研究了 url_for()并将其反转的方法:

This is what I hacked for this purpose looking at url_for() and reversing it:

from flask.globals import _app_ctx_stack, _request_ctx_stack
from werkzeug.urls import url_parse

def route_from(url, method = None):
    appctx = _app_ctx_stack.top
    reqctx = _request_ctx_stack.top
    if appctx is None:
        raise RuntimeError('Attempted to match a URL without the '
                           'application context being pushed. This has to be '
                           'executed when application context is available.')

    if reqctx is not None:
        url_adapter = reqctx.url_adapter
    else:
        url_adapter = appctx.url_adapter
        if url_adapter is None:
            raise RuntimeError('Application was not able to create a URL '
                               'adapter for request independent URL matching. '
                               'You might be able to fix this by setting '
                               'the SERVER_NAME config variable.')
    parsed_url = url_parse(url)
    if parsed_url.netloc is not "" and parsed_url.netloc != url_adapter.server_name:
        raise NotFound()
    return url_adapter.match(parsed_url.path, method)

此方法的返回值是一个元组，第一个元素是端点名称，第二个是带有参数的字典.

The return value of this method is a tuple, with the first element being the endpoint name and the second a dictionary with the arguments.

我还没有对其进行广泛的测试，但是它在所有情况下都对我有用.

I haven't tested it extensively, but it worked for me in all cases.

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