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root/proj/trunk/Search/HttpHandler.cpp

Comparing trunk/Search/HttpHandler.cpp (file contents):
Revision 14 by douglas, 2002-12-07T00:19:03-08:00 vs.
Revision 179 by douglas, 2003-07-05T19:47:23-07:00

#	Line 1 | Line 1
1		/* ============================================================================
2		* Douglas Thrift's Search Engine License
3		*
4	<	* Copyright (C) 2002, Douglas Thrift. All Rights Reserved.
4	>	* Copyright (C) 2002-2003, Douglas Thrift. All Rights Reserved.
5		* Redistribution and use in source and binary forms, with or without
6		* modification, are permitted provided that the following conditions are met:
7		*
#	Line 50 | Line 50
50
51		#include "HttpHandler.h"
52
53	+	// Lovely C Sockets!
54	+	#ifndef _WIN32
55	+	// BSD Sockets
56	+	#include <unistd.h>
57	+	#include <sys/types.h>
58	+	#include <sys/socket.h>
59	+	#include <netinet/in.h>
60	+	#include <netdb.h>
61	+
62	+	#define INVALID_SOCKET -1
63	+	#define SOCKET_ERROR -1
64	+
65	+	inline int closesocket(SOCKET s) { return close(s); }
66	+	#endif
67	+
68		HttpHandler::HttpHandler()
69		{
70		buffer = new char[BUFSIZ + 1];
#	Line 57 | Line 72 | HttpHandler::HttpHandler()
72		#ifdef _WIN32
73		if (WSAStartup(MAKEWORD(2, 0), &data) != 0)
74		{
75	<	error(program + ": WSAStartup()");
75	>	error(program + ": WSAStartup");
76		exit(1);
77		}
78		#endif // _WIN32
79
80	<	begin = 0;
80	>	length = 0;
81	>	chunked = false;
82		}
83
84		HttpHandler::~HttpHandler()
#	Line 74 | Line 90 | HttpHandler::~HttpHandler()
90		#endif // _WIN32
91		}
92
93	<	bool HttpHandler::handle(URL &url, bool head)
93	>	bool HttpHandler::handle(URL &url, const string referer, bool head)
94		{
95		bool answer = false;
96
#	Line 131 | Line 147 | bool HttpHandler::handle(URL &url, bool
147		delete [] port;
148		}
149
150	<	putline();
150	>	if (referer != "")
151	>	{
152	>	putline("Referer: " + referer);
153	>	}
154
155	<	return answer;
156	<	}
155	>	putline("Connection: close");
156	>	putline();
157
158	<	HttpHandler& HttpHandler::getline(string& line, char endline)
159	<	{
141	<	int end = page.find(endline, begin);
142	<	int newline = page.find('\n', begin);
158	>	code response;
159	>	string line;
160
161	<	if (newline < end || end == string::npos)
161	>	do
162		{
163	<	end = newline;
164	<	}
163	>	line = getline();
164	>
165	>	if (line.find("HTTP/") != 0)
166	>	{
167	>	return answer;
168	>	}
169	>
170	>	unsigned dot = line.find('.');
171	>	unsigned space = line.find(' ');
172
173	<	line = page.substr(begin, end - begin);
173	>	unsigned major = strtoul(line.substr(5, dot - 5).c_str(), 0, 10);
174	>	unsigned minor = strtoul(line.substr(dot + 1, space - dot - 1).c_str(),
175	>	0, 10);
176
177	<	if (end == string::npos)
177	>	if (major > 1)
178	>	{
179	>	cerr << program << ": Potentially Incompatible Server: HTTP/" <<
180	>	major << "." << minor << "\n";
181	>
182	>	return answer;
183	>	}
184	>
185	>	response = code(strtoul(line.substr(space + 1).c_str(), 0, 10));
186	>
187	>	if (response < ok) do line = getline(); while (line != "");
188	>	}
189	>	while (response < ok);
190	>
191	>	do
192		{
193	<	begin = end;
193	>	line = getline();
194	>
195	>	if (line != "")
196	>	{
197	>	unsigned colon = line.find(':');
198	>
199	>	string field = line.substr(0, colon);
200	>	string value = line.substr(colon + 1);
201	>
202	>	while (isspace(value[0])) value.erase(0, 1);
203	>
204	>	if (field == "Content-Type")
205	>	{
206	>	type = value;
207	>	}
208	>	else if (field == "Content-Length")
209	>	{
210	>	length = strtoul(value.c_str(), 0, 10);
211	>	}
212	>	else if (field == "Location")
213	>	{
214	>	location = value;
215	>	}
216	>	else if (field == "Transfer-Encoding")
217	>	{
218	>	chunked = value == "chunked";
219	>	}
220	>	}
221		}
222	<	else
222	>	while (line != "");
223	>
224	>	switch (response)
225		{
226	<	begin = end + 1;
226	>	case ok:
227	>	if (debug) cerr << "response = " << response << "\n";
228	>	answer = true;
229	>	break;
230	>	case choices:
231	>	case moved:
232	>	case found:
233	>	if (debug) cerr << "response = " << response << "\n"
234	>	<< "location = " << location << "\n";
235	>	location = getLink(location, url);
236	>	break;
237	>	case notfound:
238	>	case internal:
239	>	if (debug) cerr << "response = " << response << "\n";
240	>	break;
241	>	default:
242	>	if (debug) cerr << "response = " << response << "\n";
243	>	if (response <= 299)
244	>	{
245	>	answer = true;
246	>	}
247	>	else if (response <= 399)
248	>	{
249	>	location = getLink(location, url);
250	>	}
251	>	break;
252		}
253
254	<	return *this;
254	>	if (!head && answer) populate();
255	>
256	>	return answer;
257		}
258
259	<	bool HttpHandler::good()
259	>	HttpHandler& HttpHandler::getline(string& line, char endline)
260		{
261	<	bool answer = true;
261	>	unsigned end = page.find(endline);
262	>	unsigned newline = page.find('\n');
263
264	<	if (begin >= page.length())
168	<	{
169	<	answer = false;
170	<	}
171	<	else if (begin == string::npos)
264	>	if (newline < end || end == string::npos)
265		{
266	<	answer = false;
266	>	end = newline;
267		}
268
269	<	return answer;
269	>	line = page.substr(0, end);
270	>	page.erase(0, (end == string::npos ? end : end + 1));
271	>
272	>	return *this;
273		}
274
275		void HttpHandler::clear()
276		{
277	<	begin = 0;
277	>	closesocket(http);
278	>
279	>	type = "";
280	>	length = 0;
281	>	location = "";
282		page = "";
283	+	chunked = false;
284	+	}
285	+
286	+	void HttpHandler::populate()
287	+	{
288	+	if (!chunked)
289	+	{
290	+	unsigned left = length;
291	+
292	+	while (left > 0)
293	+	{
294	+	memset(buffer, 0, BUFSIZ + 1);
295	+
296	+	unsigned bytes = left > BUFSIZ ? BUFSIZ : left;
297	+	unsigned received;
298	+
299	+	while (true)
300	+	{
301	+	if ((received = recv(http, buffer, bytes, 0)) == SOCKET_ERROR)
302	+	{
303	+	error(program + ": Recv");
304	+	exit(1);
305	+	}
306	+	else if (received != bytes)
307	+	{
308	+	left -= received;
309	+	page += buffer;
310	+
311	+	memset(buffer, 0, BUFSIZ + 1);
312	+
313	+	bytes -= received;
314	+	}
315	+	else
316	+	{
317	+	break;
318	+	}
319	+	}
320	+
321	+	page += buffer;
322	+	left -= bytes;
323	+	}
324	+	}
325	+	else
326	+	{
327	+	unsigned chunk;
328	+
329	+	do
330	+	{
331	+	chunk = strtoul(getline().c_str(), 0, 16);
332	+
333	+	unsigned left = chunk;
334	+
335	+	while (left > 0)
336	+	{
337	+	memset(buffer, 0, BUFSIZ + 1);
338	+
339	+	unsigned bytes = left > BUFSIZ ? BUFSIZ : left;
340	+	unsigned received;
341	+
342	+	while (true)
343	+	{
344	+	if ((received = recv(http, buffer, bytes, 0)) ==
345	+	SOCKET_ERROR)
346	+	{
347	+	error(program + ": Recv");
348	+	exit(1);
349	+	}
350	+	else if (received != bytes)
351	+	{
352	+	left -= received;
353	+	page += buffer;
354	+
355	+	memset(buffer, 0, BUFSIZ + 1);
356	+
357	+	bytes -= received;
358	+	}
359	+	else
360	+	{
361	+	break;
362	+	}
363	+	}
364	+
365	+	page += buffer;
366	+	left -= bytes;
367	+	}
368	+
369	+	getline();
370	+	length += chunk;
371	+	}
372	+	while (chunk > 0);
373	+	}
374	+
375	+	for (unsigned index = 0; index < page.length(); index++)
376	+	{
377	+	if (page[index] == '\r' && (index + 1 < page.length()) ? page[index +
378	+	1] == '\n' : false)
379	+	{
380	+	page.erase(index, 1);
381	+	}
382	+	else if (page[index] == '\r')
383	+	{
384	+	page[index] = '\n';
385	+	}
386	+	}
387		}
388
389		void HttpHandler::putline(const string line)
#	Line 192 | Line 396 | void HttpHandler::putline(const string l
396		}
397		}
398
399	<	void HttpHandler::error(const string prefix, bool host)
399	>	string HttpHandler::getline()
400	>	{
401	>	string line;
402	>	char byte;
403	>
404	>	do
405	>	{
406	>	if (recv(http, &byte, 1, 0) == SOCKET_ERROR)
407	>	{
408	>	error(program + ": Recv");
409	>	}
410	>
411	>	if (byte != '\r' && byte != '\n')
412	>	{
413	>	line += byte;
414	>	}
415	>	}
416	>	while (byte != '\n');
417	>
418	>	return line;
419	>	}
420	>
421	>	void HttpHandler::error(const string& prefix, bool host)
422		{
423		#ifdef _WIN32
424		string error;
#	Line 367 | Line 593 | void HttpHandler::error(const string pre
593		#else
594		if (host)
595		{
596	<	herror(prefix.c_str());
596	>	string error;
597	>
598	>	switch (h_errno)
599	>	{
600	>	case HOST_NOT_FOUND:
601	>	error = "Unknown host";
602	>	break;
603	>	case TRY_AGAIN:
604	>	error = "Host name lookup failure";
605	>	break;
606	>	case NO_RECOVERY:
607	>	error = "Unknown server error";
608	>	break;
609	>	case NO_DATA:
610	>	error = "No address associated with name";
611	>	break;
612	>	default:
613	>	error = "Unknown error";
614	>	break;
615	>	}
616	>
617	>	cerr << prefix << ": " << error << "\n";
618		}
619		else
620		{

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