added TwitterClient sample

Net/samples/TwitterClient/src/Twitter.cpp

@@ -0,0 +1,135 @@
+//
+// Twitter.cpp
+//
+// $Id: //poco/Main/Net/samples/TwitterClient/src/Twitter.cpp#1 $
+//
+// A C++ implementation of a Twitter client based on the POCO Net library.
+//
+// Copyright (c) 2009, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// Permission is hereby granted, free of charge, to any person or organization
+// obtaining a copy of the software and accompanying documentation covered by
+// this license (the "Software") to use, reproduce, display, distribute,
+// execute, and transmit the Software, and to prepare derivative works of the
+// Software, and to permit third-parties to whom the Software is furnished to
+// do so, all subject to the following:
+// 
+// The copyright notices in the Software and this entire statement, including
+// the above license grant, this restriction and the following disclaimer,
+// must be included in all copies of the Software, in whole or in part, and
+// all derivative works of the Software, unless such copies or derivative
+// works are solely in the form of machine-executable object code generated by
+// a source language processor.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+//
+
+
+#include "Twitter.h"
+#include "Poco/Net/HTTPClientSession.h"
+#include "Poco/Net/HTTPRequest.h"
+#include "Poco/Net/HTTPResponse.h"
+#include "Poco/Net/HTTPBasicCredentials.h"
+#include "Poco/DOM/DOMParser.h"
+#include "Poco/DOM/NodeList.h"
+#include "Poco/SAX/InputSource.h"
+#include "Poco/URI.h"
+#include "Poco/NumberParser.h"
+
+
+const std::string Twitter::TWITTER_URI("http://twitter.com/statuses/");
+
+
+Twitter::Twitter():
+	_uri(TWITTER_URI)
+{
+}
+
+	
+Twitter::Twitter(const std::string& twitterURI):
+	_uri(twitterURI)
+{
+}
+
+	
+Twitter::~Twitter()
+{
+}
+
+
+void Twitter::login(const std::string& username, const std::string& password)
+{
+	_username = username;
+	_password = password;
+}
+
+	
+Poco::Int64 Twitter::update(const std::string& status)
+{
+	Poco::Net::HTMLForm form;
+	form.set("status", status);
+	Poco::AutoPtr<Poco::XML::Document> pResult = invoke(Poco::Net::HTTPRequest::HTTP_POST, "update", form);
+	Poco::AutoPtr<Poco::XML::NodeList> pList = pResult->getElementsByTagName("id");
+	if (pList->length() > 0)
+	{
+		return Poco::NumberParser::parse64(pList->item(0)->innerText());
+	}
+	else return 0;
+}
+
+
+Poco::AutoPtr<Poco::XML::Document> Twitter::invoke(const std::string& httpMethod, const std::string& twitterMethod, Poco::Net::HTMLForm& form)
+{
+	// Create the request URI.
+	// We use the XML version of the Twitter API.
+	Poco::URI uri(_uri + twitterMethod + ".xml");
+	std::string path(uri.getPath());
+	
+	Poco::Net::HTTPClientSession session(uri.getHost(), uri.getPort());
+	Poco::Net::HTTPRequest req(httpMethod, path, Poco::Net::HTTPMessage::HTTP_1_1);
+	
+	// Add username and password (HTTP basic authentication) to the request.
+	Poco::Net::HTTPBasicCredentials cred(_username, _password);
+	cred.authenticate(req);
+	
+	// Send the request.
+	form.prepareSubmit(req);
+	std::ostream& ostr = session.sendRequest(req);
+	form.write(ostr);
+	
+	// Receive the response.
+	Poco::Net::HTTPResponse res;
+	std::istream& rs = session.receiveResponse(res);
+	
+	// Create a DOM document from the response.
+	Poco::XML::DOMParser parser;
+	parser.setFeature(Poco::XML::DOMParser::FEATURE_WHITESPACE, true);
+	parser.setFeature(Poco::XML::XMLReader::FEATURE_NAMESPACES, false);
+	Poco::XML::InputSource source(rs);
+	Poco::AutoPtr<Poco::XML::Document> pDoc = parser.parse(&source);
+	
+	// If everything went fine, return the XML document.
+	// Otherwise look for an error message in the XML document.
+	if (res.getStatus() == Poco::Net::HTTPResponse::HTTP_OK)
+	{
+		return pDoc;
+	}
+	else
+	{
+		std::string error(res.getReason());
+		Poco::AutoPtr<Poco::XML::NodeList> pList = pDoc->getElementsByTagName("error");
+		if (pList->length() > 0)
+		{
+			error += ": ";
+			error += pList->item(0)->innerText();
+		}
+		throw Poco::ApplicationException("Twitter Error", error);
+	}
+}