ObjFW  Diff

/*
 * Copyright (c) 2008-2022 Jonathan Schleifer <js@nil.im>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *

#import "OFData.h"
#import "OFDictionary.h"
#import "OFHTTPRequest.h"
#import "OFHTTPResponse.h"
#import "OFKernelEventObserver.h"
#import "OFNumber.h"
#import "OFRunLoop.h"
#import "OFString.h"
#import "OFTCPSocket.h"
#import "OFTLSStream.h"
#import "OFURL.h"

#import "OFAlreadyConnectedException.h"
#import "OFHTTPRequestFailedException.h"
#import "OFInvalidArgumentException.h"
#import "OFInvalidEncodingException.h"
#import "OFInvalidFormatException.h"
#import "OFInvalidServerReplyException.h"
#import "OFNotImplementedException.h"
#import "OFNotOpenException.h"
#import "OFOutOfMemoryException.h"
#import "OFOutOfRangeException.h"
#import "OFTruncatedDataException.h"
#import "OFUnsupportedProtocolException.h"
#import "OFUnsupportedVersionException.h"
#import "OFWriteFailedException.h"

static const unsigned int defaultRedirects = 10;

OF_DIRECT_MEMBERS
@interface OFHTTPClientRequestHandler: OFObject <OFTCPSocketDelegate,
    OFTLSStreamDelegate>
{
@public
	OFHTTPClient *_client;
	OFHTTPRequest *_request;
	unsigned int _redirects;
	bool _firstLine;
	OFString *_version;

- (void)closeAndReconnect;
@end

OF_DIRECT_MEMBERS
@interface OFHTTPClientRequestBodyStream: OFStream <OFReadyForWritingObserving>
{
	OFHTTPClientRequestHandler *_handler;
	OFStream *_stream;
	bool _chunked;
	unsigned long long _toWrite;
	bool _atEndOfStream;
}

- (instancetype)initWithHandler: (OFHTTPClientRequestHandler *)handler
			 stream: (OFStream *)stream;
@end

OF_DIRECT_MEMBERS
@interface OFHTTPClientResponse: OFHTTPResponse <OFReadyForReadingObserving>
{
	OFStream *_stream;
	bool _hasContentLength, _chunked, _keepAlive;
	bool _atEndOfStream, _setAtEndOfStream;
	long long _toRead;
}

@property (nonatomic, setter=of_setKeepAlive:) bool of_keepAlive;

- (instancetype)initWithStream: (OFStream *)stream;
@end

OF_DIRECT_MEMBERS
@interface OFHTTPClientSyncPerformer: OFObject <OFHTTPClientDelegate>
{
	OFHTTPClient *_client;
	OFObject <OFHTTPClientDelegate> *_delegate;

	[_client->_delegate client: _client
		 didPerformRequest: _request
			  response: nil
			 exception: exception];
}

- (void)createResponseWithStreamOrThrow: (OFStream *)stream
{
	OFURL *URL = _request.URL;
	OFHTTPClientResponse *response;
	OFString *connectionHeader;
	bool keepAlive;
	OFString *location;
	id exception;

	response = [[[OFHTTPClientResponse alloc] initWithStream: stream]
	    autorelease];
	response.protocolVersionString = _version;
	response.statusCode = _status;
	response.headers = _serverHeaders;

	connectionHeader = [_serverHeaders objectForKey: @"Connection"];
	if ([_version isEqual: @"1.1"]) {

		else
			keepAlive = false;
	}

	if (keepAlive) {
		response.of_keepAlive = true;

		_client->_stream = [stream retain];
		_client->_lastURL = [URL copy];
		_client->_lastWasHEAD =
		    (_request.method == OFHTTPRequestMethodHead);
		_client->_lastResponse = [response retain];
	}

	if (_redirects > 0 && (_status == 301 || _status == 302 ||

				 withObject: _client
				 withObject: _request
				 withObject: response
				 withObject: exception
				 afterDelay: 0];
}

- (void)createResponseWithStream: (OFStream *)stream
{
	@try {
		[self createResponseWithStreamOrThrow: stream];
	} @catch (id e) {
		[self raiseException: e];
	}
}

- (bool)handleFirstLine: (OFString *)line
{

		@throw [OFInvalidServerReplyException exception];

	_status = (short)status;

	return true;
}

- (bool)handleServerHeader: (OFString *)line stream: (OFStream *)stream
{
	OFString *key, *value, *old;
	const char *lineC, *tmp;
	char *keyC;

	if (line == nil)
		@throw [OFInvalidServerReplyException exception];

	if (line.length == 0) {
		[_serverHeaders makeImmutable];

		if ([_client->_delegate respondsToSelector: @selector(client:
		    didReceiveHeaders:statusCode:request:)])
			[_client->_delegate client: _client
				 didReceiveHeaders: _serverHeaders
					statusCode: _status
					   request: _request];

		stream.delegate = nil;

		[self performSelector: @selector(createResponseWithStream:)
			   withObject: stream
			   afterDelay: 0];

		return false;
	}

	lineC = line.UTF8String;

		value = [old stringByAppendingFormat: @",%@", value];

	[_serverHeaders setObject: value forKey: key];

	return true;
}

- (bool)stream: (OFStream *)stream
   didReadLine: (OFString *)line
     exception: (id)exception
{
	bool ret;

	if (exception != nil) {
		if ([exception isKindOfClass:
		    [OFInvalidEncodingException class]])
			exception = [OFInvalidServerReplyException exception];

		[self raiseException: exception];
		return false;
	}

	@try {
		if (_firstLine) {
			_firstLine = false;
			ret = [self handleFirstLine: line];
		} else
			ret = [self handleServerHeader: line stream: stream];

	} @catch (id e) {
		[self raiseException: e];
		ret = false;
	}

	return ret;
}

	chunked = [[headers objectForKey: @"Transfer-Encoding"]
	    isEqual: @"chunked"];

	if (chunked || [headers objectForKey: @"Content-Length"] != nil) {
		stream.delegate = nil;

		OFStream *requestBody = [[[OFHTTPClientRequestBodyStream alloc]
		    initWithHandler: self stream: stream] autorelease];


		if ([_client->_delegate respondsToSelector:
		    @selector(client:wantsRequestBody:request:)])
			[_client->_delegate client: _client
				  wantsRequestBody: requestBody
					   request: _request];
	} else
		[stream asyncReadLine];

	return nil;
}

- (void)handleStream: (OFStream *)stream
{
	/*
	 * As a work around for a bug with split packets in lighttpd when using
	 * HTTPS, we construct the complete request in a buffer string and then
	 * send it all at once.
	 *
	 * We do not use the streams's write buffer in case we need to resend
	 * the entire request (e.g. in case a keep-alive connection timed out).
	 */

	@try {
		[stream asyncWriteString: constructRequestString(_request)];
	} @catch (id e) {
		[self raiseException: e];
		return;
	}
}

-     (void)socket: (OFTCPSocket *)sock
  didConnectToHost: (OFString *)host
	      port: (uint16_t)port
	 exception: (id)exception
{
	if (exception != nil) {
		[self raiseException: exception];
		return;
	}

	sock.canBlock = false;

	if ([_client->_delegate respondsToSelector:
	    @selector(client:didCreateTCPSocket:request:)])
		[_client->_delegate client: _client
			didCreateTCPSocket: sock
				   request: _request];

	if ([_request.URL.scheme caseInsensitiveCompare: @"https"] ==
	    OFOrderedSame) {
		OFTLSStream *stream;
		@try {
			stream = [OFTLSStream streamWithStream: sock];
		} @catch (OFNotImplementedException *e) {
			[self raiseException:
			    [OFUnsupportedProtocolException
			    exceptionWithURL: _request.URL]];
			return;
		}

		if ([_client->_delegate respondsToSelector:
		    @selector(client:didCreateTLSStream:request:)])
			[_client->_delegate client: _client
				didCreateTLSStream: stream
					   request: _request];

		stream.delegate = self;
		[stream asyncPerformClientHandshakeWithHost: _request.URL.host];
	} else {
		sock.delegate = self;
		[self performSelector: @selector(handleStream:)
			   withObject: sock
			   afterDelay: 0];
	}
}

-		       (void)stream: (OFTLSStream *)stream
  didPerformClientHandshakeWithHost: (OFString *)host
			  exception: (id)exception
{
	if (exception != nil) {
		[self raiseException: exception];
		return;
	}

	[self performSelector: @selector(handleStream:)
		   withObject: stream
		   afterDelay: 0];
}

- (void)start
{
	OFURL *URL = _request.URL;
	OFStream *stream;

	/* Can we reuse the last socket? */
	if (_client->_stream != nil && !_client->_stream.atEndOfStream &&
	    [_client->_lastURL.scheme isEqual: URL.scheme] &&
	    [_client->_lastURL.host isEqual: URL.host] &&
	    (_client->_lastURL.port == URL.port ||
	    [_client->_lastURL.port isEqual: URL.port]) &&
	    (_client->_lastWasHEAD || _client->_lastResponse.atEndOfStream)) {
		/*
		 * Set _stream to nil, so that in case of an error it won't be
		 * reused. If everything is successful, we set _stream again
		 * at the end.
		 */
		stream = [_client->_stream autorelease];
		_client->_stream = nil;

		[_client->_lastURL release];
		_client->_lastURL = nil;

		[_client->_lastResponse release];
		_client->_lastResponse = nil;

		stream.delegate = self;

		[self performSelector: @selector(handleStream:)
			   withObject: stream
			   afterDelay: 0];
	} else
		[self closeAndReconnect];
}

- (void)closeAndReconnect
{
	@try {
		OFURL *URL = _request.URL;
		OFTCPSocket *sock;
		uint16_t port;
		OFNumber *URLPort;

		[_client close];

		sock = [OFTCPSocket socket];

		if ([URL.scheme caseInsensitiveCompare: @"https"] ==
		    OFOrderedSame)





			port = 443;
		else

			port = 80;


		URLPort = URL.port;
		if (URLPort != nil)
			port = URLPort.unsignedShortValue;

		sock.delegate = self;
		[sock asyncConnectToHost: URL.host port: port];
	} @catch (id e) {
		[self raiseException: e];
	}
}
@end

@implementation OFHTTPClientRequestBodyStream
- (instancetype)initWithHandler: (OFHTTPClientRequestHandler *)handler
			 stream: (OFStream *)stream
{
	self = [super init];

	@try {
		OFDictionary OF_GENERIC(OFString *, OFString *) *headers;
		OFString *transferEncoding, *contentLengthString;

		_handler = [handler retain];
		_stream = [stream retain];

		headers = _handler->_request.headers;

		transferEncoding = [headers objectForKey: @"Transfer-Encoding"];
		_chunked = [transferEncoding isEqual: @"chunked"];

		contentLengthString = [headers objectForKey: @"Content-Length"];

	}

	return self;
}

- (void)dealloc
{
	if (_stream != nil)
		[self close];

	[_handler release];

	[super dealloc];
}

- (size_t)lowlevelWriteBuffer: (const void *)buffer length: (size_t)length

{


	/* TODO: Use non-blocking writes */

	if (_stream == nil)
		@throw [OFNotOpenException exceptionWithObject: self];

	/*
	 * We must not send a chunk of size 0, as that would end the body. We
	 * always ignore writing 0 bytes to still allow writing 0 bytes after
	 * the end of stream.
	 */
	if (length == 0)
		return 0;

	if (_atEndOfStream)
		@throw [OFWriteFailedException exceptionWithObject: self

						   requestedLength: length
						      bytesWritten: 0
							     errNo: ENOTCONN];

	if (_chunked)
		[_stream writeFormat: @"%zX\r\n", length];
	else if (length > _toWrite)

		@throw [OFOutOfRangeException exception];

	[_stream writeBuffer: buffer length: length];
	if (_chunked)
		[_stream writeString: @"\r\n"];




	if (!_chunked) {
		_toWrite -= length;

		if (_toWrite == 0)
			_atEndOfStream = true;
	}








	return length;
}

- (bool)lowlevelIsAtEndOfStream
{
	return _atEndOfStream;
}

- (void)close
{
	if (_stream == nil)
		@throw [OFNotOpenException exceptionWithObject: self];

	if (_chunked)
		[_stream writeString: @"0\r\n\r\n"];
	else if (_toWrite > 0)
		@throw [OFTruncatedDataException exception];

	_stream.delegate = _handler;
	[_stream asyncReadLine];

	[_stream release];
	_stream = nil;

	[super close];
}

- (int)fileDescriptorForWriting
{
	return ((OFStream <OFReadyForWritingObserving> *)_stream)
	    .fileDescriptorForWriting;
}
@end

@implementation OFHTTPClientResponse
@synthesize of_keepAlive = _keepAlive;

- (instancetype)initWithStream: (OFStream *)stream
{
	self = [super init];

	_stream = [stream retain];

	return self;
}

- (void)dealloc
{
	if (_stream != nil)
		[self close];

	[super dealloc];
}

- (void)setHeaders: (OFDictionary *)headers
{

			@throw [OFInvalidServerReplyException exception];
		}
	}
}

- (size_t)lowlevelReadIntoBuffer: (void *)buffer length: (size_t)length
{
	if (_stream == nil)
		@throw [OFNotOpenException exceptionWithObject: self];

	if (_atEndOfStream)
		return 0;

	if (!_hasContentLength && !_chunked)
		return [_stream readIntoBuffer: buffer length: length];

	if (_stream.atEndOfStream)
		@throw [OFTruncatedDataException exception];

	/* Content-Length */
	if (!_chunked) {
		size_t ret;

		if (length > (unsigned long long)_toRead)
			length = (size_t)_toRead;

		ret = [_stream readIntoBuffer: buffer length: length];
		if (ret > length)
			@throw [OFOutOfRangeException exception];

		_toRead -= ret;

		if (_toRead == 0)
			_atEndOfStream = true;

		return ret;
	}

	/* Chunked */
	if (_toRead == -2) {
		char tmp[2];

		switch ([_stream readIntoBuffer: tmp length: 2]) {
		case 2:
			_toRead++;
			if (tmp[1] != '\n')
				@throw [OFInvalidServerReplyException
				    exception];
		case 1:
			_toRead++;
			if (tmp[0] != '\r')
				@throw [OFInvalidServerReplyException
				    exception];
		}

		if (_setAtEndOfStream && _toRead == 0)
			_atEndOfStream = true;

		return 0;
	} else if (_toRead == -1) {
		char tmp;

		if ([_stream readIntoBuffer: &tmp length: 1] == 1) {
			_toRead++;
			if (tmp != '\n')
				@throw [OFInvalidServerReplyException
				    exception];
		}

		if (_setAtEndOfStream && _toRead == 0)
			_atEndOfStream = true;

		return 0;
	} else if (_toRead > 0) {
		if (length > (unsigned long long)_toRead)
			length = (size_t)_toRead;

		length = [_stream readIntoBuffer: buffer length: length];

		_toRead -= length;
		if (_toRead == 0)
			_toRead = -2;

		return length;
	} else {
		void *pool = objc_autoreleasePoolPush();
		OFString *line;
		size_t pos;

		@try {
			line = [_stream tryReadLine];
		} @catch (OFInvalidEncodingException *e) {
			@throw [OFInvalidServerReplyException exception];
		}

		if (line == nil)
			return 0;

		pos = [line rangeOfString: @";"].location;
		if (pos != OFNotFound)
			line = [line substringToIndex: pos];

		if (line.length < 1) {
			/*
			 * We have read the empty string because the stream is
			 * at end of stream.
			 */
			if (_stream.atEndOfStream && pos == OFNotFound)
				@throw [OFTruncatedDataException exception];
			else
				@throw [OFInvalidServerReplyException
				    exception];
		}

		@try {

}

- (bool)lowlevelIsAtEndOfStream
{
	if (_atEndOfStream)
		return true;

	if (_stream == nil)
		@throw [OFNotOpenException exceptionWithObject: self];

	if (!_hasContentLength && !_chunked)
		return _stream.atEndOfStream;

	return _atEndOfStream;
}

- (int)fileDescriptorForReading
{
	if (_stream == nil)
		return -1;

	return ((OFStream <OFReadyForReadingObserving> *)_stream)
	    .fileDescriptorForReading;
}

- (bool)hasDataInReadBuffer
{
	return (super.hasDataInReadBuffer || _stream.hasDataInReadBuffer);
}

- (void)close
{
	if (_stream == nil)
		@throw [OFNotOpenException exceptionWithObject: self];

	_atEndOfStream = false;

	[_stream release];
	_stream = nil;

	[super close];
}
@end

@implementation OFHTTPClientSyncPerformer
- (instancetype)initWithClient: (OFHTTPClient *)client

	[_delegate     client: client
	    didPerformRequest: request
		     response: response
		    exception: nil];
}

-	(void)client: (OFHTTPClient *)client
  didCreateTCPSocket: (OFTCPSocket *)TCPSocket
	     request: (OFHTTPRequest *)request
{
	if ([_delegate respondsToSelector:
	    @selector(client:didCreateTCPSocket:request:)])
		[_delegate	client: client
		    didCreateTCPSocket: TCPSocket
			       request: request];
}

-	(void)client: (OFHTTPClient *)client
  didCreateTLSStream: (OFTLSStream *)TLSStream
	     request: (OFHTTPRequest *)request
{
	if ([_delegate respondsToSelector:
	    @selector(client:didCreateTLSStream:request:)])
		[_delegate	client: client
		    didCreateTLSStream: TLSStream
			       request: request];
}

-     (void)client: (OFHTTPClient *)client
  wantsRequestBody: (OFStream *)body
	   request: (OFHTTPRequest *)request
{
	if ([_delegate respondsToSelector:

		 redirects: redirects] autorelease] start];

	objc_autoreleasePoolPop(pool);
}

- (void)close
{
	[_stream release];
	_stream = nil;

	[_lastURL release];
	_lastURL = nil;

	[_lastResponse release];
	_lastResponse = nil;
}
@end