summaryrefslogtreecommitdiff
path: root/indra/llmessage/llurlrequest.cpp
blob: 927377217635a51f43fe06fe49056ee173ea746c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
/** 
 * @file llurlrequest.cpp
 * @author Phoenix
 * @date 2005-04-28
 * @brief Implementation of the URLRequest class and related classes.
 *
 * $LicenseInfo:firstyear=2005&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "linden_common.h"
#include "llurlrequest.h"

#include <algorithm>
#include <openssl/x509_vfy.h>
#include <openssl/ssl.h>
#include "llcurl.h"
#include "llioutil.h"
#include "llmemtype.h"
#include "llpumpio.h"
#include "llsd.h"
#include "llstring.h"
#include "apr_env.h"
#include "llapr.h"
#include "llscopedvolatileaprpool.h"
static const U32 HTTP_STATUS_PIPE_ERROR = 499;

/**
 * String constants
 */
const std::string CONTEXT_DEST_URI_SD_LABEL("dest_uri");
const std::string CONTEXT_TRANSFERED_BYTES("transfered_bytes");


static size_t headerCallback(void* data, size_t size, size_t nmemb, void* user);



/**
 * class LLURLRequestDetail
 */
class LLURLRequestDetail
{
public:
	LLURLRequestDetail();
	~LLURLRequestDetail();
	std::string mURL;
	LLCurlEasyRequest* mCurlRequest;
	LLBufferArray* mResponseBuffer;
	LLChannelDescriptors mChannels;
	U8* mLastRead;
	U32 mBodyLimit;
	S32 mByteAccumulator;
	bool mIsBodyLimitSet;
	LLURLRequest::SSLCertVerifyCallback mSSLVerifyCallback;
};

LLURLRequestDetail::LLURLRequestDetail() :
	mCurlRequest(NULL),
	mResponseBuffer(NULL),
	mLastRead(NULL),
	mBodyLimit(0),
	mByteAccumulator(0),
	mIsBodyLimitSet(false),
    mSSLVerifyCallback(NULL)
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	mCurlRequest = new LLCurlEasyRequest();
}

LLURLRequestDetail::~LLURLRequestDetail()
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	delete mCurlRequest;
	mResponseBuffer = NULL;
	mLastRead = NULL;
}

void LLURLRequest::setSSLVerifyCallback(SSLCertVerifyCallback callback, void *param)
{
	mDetail->mSSLVerifyCallback = callback;
	mDetail->mCurlRequest->setSSLCtxCallback(LLURLRequest::_sslCtxCallback, (void *)this);
	mDetail->mCurlRequest->setopt(CURLOPT_SSL_VERIFYPEER, true);
	mDetail->mCurlRequest->setopt(CURLOPT_SSL_VERIFYHOST, 2);	
}


// _sslCtxFunction
// Callback function called when an SSL Context is created via CURL
// used to configure the context for custom cert validation

CURLcode LLURLRequest::_sslCtxCallback(CURL * curl, void *sslctx, void *param)
{	
	LLURLRequest *req = (LLURLRequest *)param;
	if(req == NULL || req->mDetail->mSSLVerifyCallback == NULL)
	{
		SSL_CTX_set_cert_verify_callback((SSL_CTX *)sslctx, NULL, NULL);
		return CURLE_OK;
	}
	SSL_CTX * ctx = (SSL_CTX *) sslctx;
	// disable any default verification for server certs
	SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL);
	// set the verification callback.
	SSL_CTX_set_cert_verify_callback(ctx, req->mDetail->mSSLVerifyCallback, (void *)req);
	// the calls are void
	return CURLE_OK;
	
}

/**
 * class LLURLRequest
 */

// static
std::string LLURLRequest::actionAsVerb(LLURLRequest::ERequestAction action)
{
	static const std::string VERBS[] =
	{
		"(invalid)",
		"HEAD",
		"GET",
		"PUT",
		"POST",
		"DELETE",
		"MOVE"
	};
	if(((S32)action <=0) || ((S32)action >= REQUEST_ACTION_COUNT))
	{
		return VERBS[0];
	}
	return VERBS[action];
}

LLURLRequest::LLURLRequest(LLURLRequest::ERequestAction action) :
	mAction(action)
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	initialize();
}

LLURLRequest::LLURLRequest(
	LLURLRequest::ERequestAction action,
	const std::string& url) :
	mAction(action)
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	initialize();
	setURL(url);
}

LLURLRequest::~LLURLRequest()
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	delete mDetail;
}

void LLURLRequest::setURL(const std::string& url)
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	mDetail->mURL = url;
}

std::string LLURLRequest::getURL() const
{
	return mDetail->mURL;
}

void LLURLRequest::addHeader(const char* header)
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	mDetail->mCurlRequest->slist_append(header);
}

void LLURLRequest::setBodyLimit(U32 size)
{
	mDetail->mBodyLimit = size;
	mDetail->mIsBodyLimitSet = true;
}

void LLURLRequest::setCallback(LLURLRequestComplete* callback)
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	mCompletionCallback = callback;
	mDetail->mCurlRequest->setHeaderCallback(&headerCallback, (void*)callback);
}

// Added to mitigate the effect of libcurl looking
// for the ALL_PROXY and http_proxy env variables
// and deciding to insert a Pragma: no-cache
// header! The only usage of this method at the
// time of this writing is in llhttpclient.cpp
// in the request() method, where this method
// is called with use_proxy = FALSE
void LLURLRequest::useProxy(bool use_proxy)
{
    static std::string env_proxy;

    if (use_proxy && env_proxy.empty())
    {
		char* env_proxy_str;
        LLScopedVolatileAPRPool scoped_pool;
        apr_status_t status = apr_env_get(&env_proxy_str, "ALL_PROXY", scoped_pool);
        if (status != APR_SUCCESS)
        {
			status = apr_env_get(&env_proxy_str, "http_proxy", scoped_pool);
        }
        if (status != APR_SUCCESS)
        {
            use_proxy = false;
        }
		else
		{
			// env_proxy_str is stored in the scoped_pool, so we have to make a copy.
			env_proxy = env_proxy_str;
		}
    }

    lldebugs << "use_proxy = " << (use_proxy?'Y':'N') << ", env_proxy = \"" << env_proxy << "\"" << llendl;

    if (use_proxy)
    {
		mDetail->mCurlRequest->setoptString(CURLOPT_PROXY, env_proxy);
    }
    else
    {
        mDetail->mCurlRequest->setoptString(CURLOPT_PROXY, "");
    }
}

void LLURLRequest::useProxy(const std::string &proxy)
{
    mDetail->mCurlRequest->setoptString(CURLOPT_PROXY, proxy);
}

void LLURLRequest::allowCookies()
{
	mDetail->mCurlRequest->setoptString(CURLOPT_COOKIEFILE, "");
}

// virtual
LLIOPipe::EStatus LLURLRequest::handleError(
	LLIOPipe::EStatus status,
	LLPumpIO* pump)
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	if(mCompletionCallback && pump)
	{
		LLURLRequestComplete* complete = NULL;
		complete = (LLURLRequestComplete*)mCompletionCallback.get();
		complete->httpStatus(
			HTTP_STATUS_PIPE_ERROR,
			LLIOPipe::lookupStatusString(status));
		complete->responseStatus(status);
		pump->respond(complete);
		mCompletionCallback = NULL;
	}
	return status;
}

// virtual
LLIOPipe::EStatus LLURLRequest::process_impl(
	const LLChannelDescriptors& channels,
	buffer_ptr_t& buffer,
	bool& eos,
	LLSD& context,
	LLPumpIO* pump)
{
	PUMP_DEBUG;
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	//llinfos << "LLURLRequest::process_impl()" << llendl;
	if (!buffer) return STATUS_ERROR;
	
	// we're still waiting or prcessing, check how many
	// bytes we have accumulated.
	const S32 MIN_ACCUMULATION = 100000;
	if(pump && (mDetail->mByteAccumulator > MIN_ACCUMULATION))
	{
		 // This is a pretty sloppy calculation, but this
		 // tries to make the gross assumption that if data
		 // is coming in at 56kb/s, then this transfer will
		 // probably succeed. So, if we're accumlated
		 // 100,000 bytes (MIN_ACCUMULATION) then let's
		 // give this client another 2s to complete.
		 const F32 TIMEOUT_ADJUSTMENT = 2.0f;
		 mDetail->mByteAccumulator = 0;
		 pump->adjustTimeoutSeconds(TIMEOUT_ADJUSTMENT);
		 lldebugs << "LLURLRequest adjustTimeoutSeconds for request: " << mDetail->mURL << llendl;
		 if (mState == STATE_INITIALIZED)
		 {
			  llinfos << "LLURLRequest adjustTimeoutSeconds called during upload" << llendl;
		 }
	}

	switch(mState)
	{
	case STATE_INITIALIZED:
	{
		PUMP_DEBUG;
		// We only need to wait for input if we are uploading
		// something.
		if(((HTTP_PUT == mAction) || (HTTP_POST == mAction)) && !eos)
		{
			// we're waiting to get all of the information
			return STATUS_BREAK;
		}

		// *FIX: bit of a hack, but it should work. The configure and
		// callback method expect this information to be ready.
		mDetail->mResponseBuffer = buffer.get();
		mDetail->mChannels = channels;
		if(!configure())
		{
			return STATUS_ERROR;
		}
		mState = STATE_WAITING_FOR_RESPONSE;

		// *FIX: Maybe we should just go to the next state now...
		return STATUS_BREAK;
	}
	case STATE_WAITING_FOR_RESPONSE:
	case STATE_PROCESSING_RESPONSE:
	{
		PUMP_DEBUG;
		LLIOPipe::EStatus status = STATUS_BREAK;
		mDetail->mCurlRequest->perform();
		while(1)
		{
			CURLcode result;
			bool newmsg = mDetail->mCurlRequest->getResult(&result);
			if(!newmsg)
			{
				// keep processing
				break;
			}

			mState = STATE_HAVE_RESPONSE;
			context[CONTEXT_REQUEST][CONTEXT_TRANSFERED_BYTES] = mRequestTransferedBytes;
			context[CONTEXT_RESPONSE][CONTEXT_TRANSFERED_BYTES] = mResponseTransferedBytes;
			lldebugs << this << "Setting context to " << context << llendl;
			switch(result)
			{
				case CURLE_OK:
				case CURLE_WRITE_ERROR:
					// NB: The error indication means that we stopped the
					// writing due the body limit being reached
					if(mCompletionCallback && pump)
					{
						LLURLRequestComplete* complete = NULL;
						complete = (LLURLRequestComplete*)
							mCompletionCallback.get();
						complete->responseStatus(
								result == CURLE_OK
									? STATUS_OK : STATUS_STOP);
						LLPumpIO::links_t chain;
						LLPumpIO::LLLinkInfo link;
						link.mPipe = mCompletionCallback;
						link.mChannels = LLBufferArray::makeChannelConsumer(
							channels);
						chain.push_back(link);
						pump->respond(chain, buffer, context);
						mCompletionCallback = NULL;
					}
					break;
				case CURLE_FAILED_INIT:
				case CURLE_COULDNT_CONNECT:
					status = STATUS_NO_CONNECTION;
					break;
				default:
					llwarns << "URLRequest Error: " << result
							<< ", "
							<< LLCurl::strerror(result)
							<< ", "
							<< (mDetail->mURL.empty() ? "<EMPTY URL>" : mDetail->mURL)
							<< llendl;
					status = STATUS_ERROR;
					break;
			}
		}
		return status;
	}
	case STATE_HAVE_RESPONSE:
		PUMP_DEBUG;
		// we already stuffed everything into channel in in the curl
		// callback, so we are done.
		eos = true;
		context[CONTEXT_REQUEST][CONTEXT_TRANSFERED_BYTES] = mRequestTransferedBytes;
		context[CONTEXT_RESPONSE][CONTEXT_TRANSFERED_BYTES] = mResponseTransferedBytes;
		lldebugs << this << "Setting context to " << context << llendl;
		return STATUS_DONE;

	default:
		PUMP_DEBUG;
		context[CONTEXT_REQUEST][CONTEXT_TRANSFERED_BYTES] = mRequestTransferedBytes;
		context[CONTEXT_RESPONSE][CONTEXT_TRANSFERED_BYTES] = mResponseTransferedBytes;
		lldebugs << this << "Setting context to " << context << llendl;
		return STATUS_ERROR;
	}
}

void LLURLRequest::initialize()
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	mState = STATE_INITIALIZED;
	mDetail = new LLURLRequestDetail;
	mDetail->mCurlRequest->setopt(CURLOPT_NOSIGNAL, 1);
	mDetail->mCurlRequest->setWriteCallback(&downCallback, (void*)this);
	mDetail->mCurlRequest->setReadCallback(&upCallback, (void*)this);
	mRequestTransferedBytes = 0;
	mResponseTransferedBytes = 0;
}

bool LLURLRequest::configure()
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	bool rv = false;
	S32 bytes = mDetail->mResponseBuffer->countAfter(
   		mDetail->mChannels.in(),
		NULL);
	switch(mAction)
	{
	case HTTP_HEAD:
		mDetail->mCurlRequest->setopt(CURLOPT_HEADER, 1);
		mDetail->mCurlRequest->setopt(CURLOPT_NOBODY, 1);
		mDetail->mCurlRequest->setopt(CURLOPT_FOLLOWLOCATION, 1);
		rv = true;
		break;
	case HTTP_GET:
		mDetail->mCurlRequest->setopt(CURLOPT_HTTPGET, 1);
		mDetail->mCurlRequest->setopt(CURLOPT_FOLLOWLOCATION, 1);

		// Set Accept-Encoding to allow response compression
		mDetail->mCurlRequest->setoptString(CURLOPT_ENCODING, "");
		rv = true;
		break;

	case HTTP_PUT:
		// Disable the expect http 1.1 extension. POST and PUT default
		// to turning this on, and I am not too sure what it means.
		addHeader("Expect:");

		mDetail->mCurlRequest->setopt(CURLOPT_UPLOAD, 1);
		mDetail->mCurlRequest->setopt(CURLOPT_INFILESIZE, bytes);
		rv = true;
		break;

	case HTTP_POST:
		// Disable the expect http 1.1 extension. POST and PUT default
		// to turning this on, and I am not too sure what it means.
		addHeader("Expect:");

		// Disable the content type http header.
		// *FIX: what should it be?
		addHeader("Content-Type:");

		// Set the handle for an http post
		mDetail->mCurlRequest->setPost(NULL, bytes);

		// Set Accept-Encoding to allow response compression
		mDetail->mCurlRequest->setoptString(CURLOPT_ENCODING, "");
		rv = true;
		break;

	case HTTP_DELETE:
		// Set the handle for an http post
		mDetail->mCurlRequest->setoptString(CURLOPT_CUSTOMREQUEST, "DELETE");
		rv = true;
		break;

	case HTTP_MOVE:
		// Set the handle for an http post
		mDetail->mCurlRequest->setoptString(CURLOPT_CUSTOMREQUEST, "MOVE");
		// *NOTE: should we check for the Destination header?
		rv = true;
		break;

	default:
		llwarns << "Unhandled URLRequest action: " << mAction << llendl;
		break;
	}
	if(rv)
	{
		mDetail->mCurlRequest->sendRequest(mDetail->mURL);
	}
	return rv;
}

// static
size_t LLURLRequest::downCallback(
	char* data,
	size_t size,
	size_t nmemb,
	void* user)
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	LLURLRequest* req = (LLURLRequest*)user;
	if(STATE_WAITING_FOR_RESPONSE == req->mState)
	{
		req->mState = STATE_PROCESSING_RESPONSE;
	}
	U32 bytes = size * nmemb;
	if (req->mDetail->mIsBodyLimitSet)
	{
		if (bytes > req->mDetail->mBodyLimit)
		{
			bytes = req->mDetail->mBodyLimit;
			req->mDetail->mBodyLimit = 0;
		}
		else
		{
			req->mDetail->mBodyLimit -= bytes;
		}
	}

	req->mDetail->mResponseBuffer->append(
		req->mDetail->mChannels.out(),
		(U8*)data,
		bytes);
	req->mResponseTransferedBytes += bytes;
	req->mDetail->mByteAccumulator += bytes;
	return bytes;
}

// static
size_t LLURLRequest::upCallback(
	char* data,
	size_t size,
	size_t nmemb,
	void* user)
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	LLURLRequest* req = (LLURLRequest*)user;
	S32 bytes = llmin(
		(S32)(size * nmemb),
		req->mDetail->mResponseBuffer->countAfter(
			req->mDetail->mChannels.in(),
			req->mDetail->mLastRead));
	req->mDetail->mLastRead =  req->mDetail->mResponseBuffer->readAfter(
		req->mDetail->mChannels.in(),
		req->mDetail->mLastRead,
		(U8*)data,
		bytes);
	req->mRequestTransferedBytes += bytes;
	return bytes;
}

static size_t headerCallback(void* data, size_t size, size_t nmemb, void* user)
{
	const char* header_line = (const char*)data;
	size_t header_len = size * nmemb;
	LLURLRequestComplete* complete = (LLURLRequestComplete*)user;

	if (!complete || !header_line)
	{
		return header_len;
	}

	// *TODO: This should be a utility in llstring.h: isascii()
	for (size_t i = 0; i < header_len; ++i)
	{
		if (header_line[i] < 0)
		{
			return header_len;
		}
	}

	std::string header(header_line, header_len);

	// Per HTTP spec the first header line must be the status line.
	if (header.substr(0,5) == "HTTP/")
	{
		std::string::iterator end = header.end();
		std::string::iterator pos1 = std::find(header.begin(), end, ' ');
		if (pos1 != end) ++pos1;
		std::string::iterator pos2 = std::find(pos1, end, ' ');
		if (pos2 != end) ++pos2;
		std::string::iterator pos3 = std::find(pos2, end, '\r');

		std::string version(header.begin(), pos1);
		std::string status(pos1, pos2);
		std::string reason(pos2, pos3);

		S32 status_code = atoi(status.c_str());
		if (status_code > 0)
		{
			complete->httpStatus((U32)status_code, reason);
			return header_len;
		}
	}

	std::string::iterator sep = std::find(header.begin(),header.end(),':');

	if (sep != header.end())
	{
		std::string key(header.begin(), sep);
		std::string value(sep + 1, header.end());

		key = utf8str_tolower(utf8str_trim(key));
		value = utf8str_trim(value);

		complete->header(key, value);
	}
	else
	{
		LLStringUtil::trim(header);
		if (!header.empty())
		{
			llwarns << "Unable to parse header: " << header << llendl;
		}
	}

	return header_len;
}

/**
 * LLContextURLExtractor
 */
// virtual
LLIOPipe::EStatus LLContextURLExtractor::process_impl(
	const LLChannelDescriptors& channels,
	buffer_ptr_t& buffer,
	bool& eos,
	LLSD& context,
	LLPumpIO* pump)
{
	PUMP_DEBUG;
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	// The destination host is in the context.
	if(context.isUndefined() || !mRequest)
	{
		return STATUS_PRECONDITION_NOT_MET;
	}

	// copy in to out, since this just extract the URL and does not
	// actually change the data.
	LLChangeChannel change(channels.in(), channels.out());
	std::for_each(buffer->beginSegment(), buffer->endSegment(), change);

	// find the context url
	if(context.has(CONTEXT_DEST_URI_SD_LABEL))
	{
		mRequest->setURL(context[CONTEXT_DEST_URI_SD_LABEL].asString());
		return STATUS_DONE;
	}
	return STATUS_ERROR;
}


/**
 * LLURLRequestComplete
 */
LLURLRequestComplete::LLURLRequestComplete() :
	mRequestStatus(LLIOPipe::STATUS_ERROR)
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
}

// virtual
LLURLRequestComplete::~LLURLRequestComplete()
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
}

//virtual 
void LLURLRequestComplete::header(const std::string& header, const std::string& value)
{
}

//virtual 
void LLURLRequestComplete::complete(const LLChannelDescriptors& channels,
		const buffer_ptr_t& buffer)
{
	if(STATUS_OK == mRequestStatus)
	{
		response(channels, buffer);
	}
	else
	{
		noResponse();
	}
}

//virtual 
void LLURLRequestComplete::response(const LLChannelDescriptors& channels,
		const buffer_ptr_t& buffer)
{
	llwarns << "LLURLRequestComplete::response default implementation called"
		<< llendl;
}

//virtual 
void LLURLRequestComplete::noResponse()
{
	llwarns << "LLURLRequestComplete::noResponse default implementation called"
		<< llendl;
}

void LLURLRequestComplete::responseStatus(LLIOPipe::EStatus status)
{
	LLMemType m1(LLMemType::MTYPE_IO_URL_REQUEST);
	mRequestStatus = status;
}

// virtual
LLIOPipe::EStatus LLURLRequestComplete::process_impl(
	const LLChannelDescriptors& channels,
	buffer_ptr_t& buffer,
	bool& eos,
	LLSD& context,
	LLPumpIO* pump)
{
	PUMP_DEBUG;
	complete(channels, buffer);
	return STATUS_OK;
}