std::istream* HTTPStreamFactory::open(const URI& uri)
{
poco_assert (uri.getScheme() == "http");
URI resolvedURI(uri);
URI proxyUri;
HTTPClientSession* pSession = 0;
HTTPResponse res;
bool retry = false;
bool authorize = false;
std::string username;
std::string password;
try
{
do
{
if (!pSession)
{
pSession = new HTTPClientSession(resolvedURI.getHost(), resolvedURI.getPort());
if (proxyUri.empty())
pSession->setProxy(_proxyHost, _proxyPort);
else
pSession->setProxy(proxyUri.getHost(), proxyUri.getPort());
pSession->setProxyCredentials(_proxyUsername, _proxyPassword);
}
std::string path = resolvedURI.getPathAndQuery();
if (path.empty()) path = "/";
HTTPRequest req(HTTPRequest::HTTP_GET, path, HTTPMessage::HTTP_1_1);
if (authorize)
{
HTTPCredentials::extractCredentials(uri, username, password);
HTTPCredentials cred(username, password);
cred.authenticate(req, res);
}
pSession->sendRequest(req);
std::istream& rs = pSession->receiveResponse(res);
bool moved = (res.getStatus() == HTTPResponse::HTTP_MOVED_PERMANENTLY ||
res.getStatus() == HTTPResponse::HTTP_FOUND ||
res.getStatus() == HTTPResponse::HTTP_SEE_OTHER ||
res.getStatus() == HTTPResponse::HTTP_TEMPORARY_REDIRECT);
if (moved)
{
resolvedURI.resolve(res.get("Location"));
if (!username.empty())
{
resolvedURI.setUserInfo(username + ":" + password);
}
throw URIRedirection(resolvedURI.toString());
}
else if (res.getStatus() == HTTPResponse::HTTP_OK)
{
return new HTTPResponseStream(rs, pSession);
}
else if (res.getStatus() == HTTPResponse::HTTP_USEPROXY && !retry)
{
// The requested resource MUST be accessed through the proxy
// given by the Location field. The Location field gives the
// URI of the proxy. The recipient is expected to repeat this
// single request via the proxy. 305 responses MUST only be generated by origin servers.
// only use for one single request!
proxyUri.resolve(res.get("Location"));
delete pSession; pSession = 0;
retry = true; // only allow useproxy once
}
else if (res.getStatus() == HTTPResponse::HTTP_UNAUTHORIZED && !authorize)
{
authorize = true;
retry = true;
Poco::NullOutputStream null;
Poco::StreamCopier::copyStream(rs, null);
}
else throw HTTPException(res.getReason(), uri.toString());
}
while (retry);
throw HTTPException("Too many redirects", uri.toString());
}
catch (...)
{
delete pSession;
throw;
}
}
