On Sun, 30 Nov 2008 21:54:17 -0600 "dave fowler" <[EMAIL PROTECTED]> wrote:
> I'd like to use python and in my research I think a twisted reverse proxy is
> what I want. I've done the examples for setting up a proxy, including one
> that counts the words on the pages you visit, but i cannot find anything on
> fetching the destination and re-directing. I've been sifting through the
> many classes of the proxy examples and am pretty lost. Does anyone have
> some example code for something like this?
>
> Thanks
>
> Dave
I use following code to add '/trac' child to nevow (twisted.web extension) page
with https-only access, mangling 'Location' header of returned answer to
prevent redirects to non-existing urls.
You can probably mangle request the same way before passing it to render
method, overriding returned headers and/or data afterwards in client class.
I doubt it'll be the fastest solution out there, but it certainly should be
quite flexible.
from urllib import quote as urlquote
from twisted.web.proxy import ReverseProxyResource, ProxyClient,
ProxyClientFactory
redirect = '<html><head><title>302 Found</title><meta http-equiv="REFRESH"
content="0; url=%s"><script>document.write("<style>a
{color:#fff;visibility:hidden;}<style>");window.location="%s"</script></head><body><a
href="%s">click here</a></body></html>'
class SokLeechFactory(ProxyClientFactory):
protocol = SokLeech
class SokLeech(ProxyClient):
def handleHeader(self, key, value):
'''Wrapper method to mangle Location header to point to
original host'''
if key == 'Location': value =
value.replace(self.father.received_headers['host'], self.father.origin)
ProxyClient.handleHeader(self, key, value)
class SslLinker(ReverseProxyResource):
'''Wrapper class to inject some mangling into proxy protocol'''
proxyClientFactoryClass = SokLeechFactory
def getChild(self, path, request):
return self.__class__(self.host, self.port, self.path + '/' +
urlquote(path, safe=""))
def render(self, request):
'''Wrapper method to store host from original request'''
if not request.isSecure():
secure_url =
'https://%s:%s%s'%(request.getRequestHostname(), cfg.web.pen.split(':',3)[1],
request.uri)
request.redirect(secure_url)
request.finish()
return redirect.replace('%s', secure_url)
request.origin = request.getRequestHostname()
ReverseProxyResource.render(self, request)
class Page(LivePage):
...
child_trac = SslLinker(self.cfg.trac.host, self.cfg.trac.port,
'/svc/trac')
...
--
Mike Kazantsev // fraggod.net
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