patch_resolveResource.py

# coding=utf-8
from plone.app.blocks import utils
from plone.subrequest import subrequest
from zExceptions import NotFound
from zope.site.hooks import getSite


def resolveResource(url):
    """Resolve the given URL to a unicode string. If the URL is an absolute
    path, it will be made relative to the Plone site root.
    """
    site = getSite()
    site_url = site.absolute_url()

    if url.startswith(site_url):
        url = url[len(site_url):]

    if url.startswith('/'):
        url = '/'.join(site.getPhysicalPath()) + url

    response = subrequest(url)
    if response.status == 404:
        raise NotFound(url)

    resolved = response.getBody()

    if isinstance(resolved, str):
        charset = utils.extractCharset(response)
        resolved = resolved.decode(charset)

    if response.status in (301, 302):
        site = getSite()
        location = response.headers.get('location') or ''
        if location.startswith(site.absolute_url()):
            return resolveResource(location[len(site.absolute_url()):])

    elif response.status != 200:
        raise RuntimeError(resolved)

    return resolved

  
utils.resolveResource = resolveResource