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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*
3 : * This file is part of the LibreOffice project.
4 : *
5 : * This Source Code Form is subject to the terms of the Mozilla Public
6 : * License, v. 2.0. If a copy of the MPL was not distributed with this
7 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 : *
9 : * This file incorporates work covered by the following license notice:
10 : *
11 : * Licensed to the Apache Software Foundation (ASF) under one or more
12 : * contributor license agreements. See the NOTICE file distributed
13 : * with this work for additional information regarding copyright
14 : * ownership. The ASF licenses this file to you under the Apache
15 : * License, Version 2.0 (the "License"); you may not use this file
16 : * except in compliance with the License. You may obtain a copy of
17 : * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 : */
19 :
20 :
21 : /*
22 : * Implementation of the I/O interfaces based on stream and URI binding
23 : */
24 : #include "xmlstreamio.hxx"
25 : #include <rtl/ustring.hxx>
26 : #include "rtl/uri.hxx"
27 :
28 : #include <libxml/uri.h>
29 : #include "xmlsecurity/xmlsec-wrapper.h"
30 :
31 : #define XMLSTREAMIO_INITIALIZED 0x01
32 : #define XMLSTREAMIO_REGISTERED 0x02
33 :
34 : /* Global variables */
35 : /*-
36 : * Enable stream I/O or not.
37 : */
38 : static char enableXmlStreamIO = 0x00 ;
39 :
40 0 : ::com::sun::star::uno::Reference< ::com::sun::star::xml::crypto::XUriBinding > m_xUriBinding ;
41 :
42 : extern "C"
43 0 : int xmlStreamMatch( const char* uri )
44 : {
45 0 : ::com::sun::star::uno::Reference< com::sun::star::io::XInputStream > xInputStream ;
46 :
47 0 : if( ( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) &&
48 0 : ( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
49 0 : if( uri == NULL || !m_xUriBinding.is() )
50 0 : return 0 ;
51 : //XMLSec first unescapes the uri and calls this function. For example, we pass the Uri
52 : //ObjectReplacements/Object%201 then XMLSec passes ObjectReplacements/Object 1
53 : //first. If this failed it would try this
54 : //again with the original escaped string. However, it does not get this far, because there
55 : //is another callback registered by libxml which claims to be able to handle this uri.
56 : OUString sUri =
57 : ::rtl::Uri::encode( OUString::createFromAscii( uri ),
58 0 : rtl_UriCharClassUric, rtl_UriEncodeKeepEscapes, RTL_TEXTENCODING_UTF8);
59 0 : xInputStream = m_xUriBinding->getUriBinding( sUri ) ;
60 0 : if (!xInputStream.is())
61 : {
62 : //Try the passed in uri directly.
63 : //For old documents prior OOo 3.0. We did not use URIs then.
64 0 : xInputStream = m_xUriBinding->getUriBinding(
65 0 : OUString::createFromAscii(uri));
66 0 : }
67 : }
68 0 : if (xInputStream.is())
69 0 : return 1;
70 : else
71 0 : return 0 ;
72 : }
73 :
74 : extern "C"
75 0 : void* xmlStreamOpen( const char* uri )
76 : {
77 0 : ::com::sun::star::uno::Reference< com::sun::star::io::XInputStream > xInputStream ;
78 :
79 0 : if( ( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) &&
80 0 : ( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
81 0 : if( uri == NULL || !m_xUriBinding.is() )
82 0 : return NULL ;
83 :
84 : //see xmlStreamMatch
85 : OUString sUri =
86 : ::rtl::Uri::encode( OUString::createFromAscii( uri ),
87 0 : rtl_UriCharClassUric, rtl_UriEncodeKeepEscapes, RTL_TEXTENCODING_UTF8);
88 0 : xInputStream = m_xUriBinding->getUriBinding( sUri ) ;
89 0 : if (!xInputStream.is())
90 : {
91 : //For old documents.
92 : //try the passed in uri directly.
93 0 : xInputStream = m_xUriBinding->getUriBinding(
94 0 : OUString::createFromAscii(uri));
95 : }
96 :
97 0 : if( xInputStream.is() ) {
98 : ::com::sun::star::io::XInputStream* pInputStream ;
99 0 : pInputStream = xInputStream.get() ;
100 0 : pInputStream->acquire() ;
101 0 : return ( void* )pInputStream ;
102 0 : }
103 : }
104 :
105 0 : return NULL ;
106 : }
107 :
108 : extern "C"
109 0 : int xmlStreamRead( void* context, char* buffer, int len )
110 : {
111 : int numbers ;
112 0 : ::com::sun::star::uno::Reference< com::sun::star::io::XInputStream > xInputStream ;
113 0 : ::com::sun::star::uno::Sequence< sal_Int8 > outSeqs( len ) ;
114 :
115 0 : numbers = 0 ;
116 0 : if( ( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) &&
117 0 : ( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
118 0 : if( context != NULL ) {
119 0 : xInputStream = ( com::sun::star::io::XInputStream* )context ;
120 0 : if( !xInputStream.is() )
121 0 : return 0 ;
122 :
123 0 : numbers = xInputStream->readBytes( outSeqs, len ) ;
124 0 : const sal_Int8* readBytes = ( const sal_Int8* )outSeqs.getArray() ;
125 0 : for( int i = 0 ; i < numbers ; i ++ )
126 0 : *( buffer + i ) = *( readBytes + i ) ;
127 : }
128 : }
129 :
130 0 : return numbers ;
131 : }
132 :
133 : extern "C"
134 0 : int xmlStreamClose( void * context )
135 : {
136 0 : if( ( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) &&
137 0 : ( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
138 0 : if( context != NULL ) {
139 : ::com::sun::star::io::XInputStream* pInputStream ;
140 0 : pInputStream = ( ::com::sun::star::io::XInputStream* )context ;
141 0 : pInputStream->release() ;
142 : }
143 : }
144 :
145 0 : return 0 ;
146 : }
147 :
148 0 : int xmlEnableStreamInputCallbacks()
149 : {
150 :
151 0 : if( !( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) ) {
152 : //Register the callbacks into xmlSec
153 : //In order to make the xmlsec io finding the callbacks firstly,
154 : //I put the callbacks at the very beginning.
155 :
156 : //Cleanup the older callbacks.
157 : //Notes: all none default callbacks will lose.
158 0 : xmlSecIOCleanupCallbacks() ;
159 :
160 : //Register my classbacks.
161 : int cbs = xmlSecIORegisterCallbacks(
162 : xmlStreamMatch,
163 : xmlStreamOpen,
164 : xmlStreamRead,
165 0 : xmlStreamClose ) ;
166 0 : if( cbs < 0 ) {
167 0 : return -1 ;
168 : }
169 :
170 : //Register the default callbacks.
171 : //Notes: the error will cause xmlsec working problems.
172 0 : cbs = xmlSecIORegisterDefaultCallbacks() ;
173 0 : if( cbs < 0 ) {
174 0 : return -1 ;
175 : }
176 :
177 0 : enableXmlStreamIO |= XMLSTREAMIO_INITIALIZED ;
178 : }
179 :
180 0 : return 0 ;
181 : }
182 :
183 0 : int xmlRegisterStreamInputCallbacks(
184 : ::com::sun::star::uno::Reference< ::com::sun::star::xml::crypto::XUriBinding >& aUriBinding
185 : ) {
186 0 : if( !( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) ) {
187 0 : if( xmlEnableStreamInputCallbacks() < 0 )
188 0 : return -1 ;
189 : }
190 :
191 0 : if( !( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
192 0 : enableXmlStreamIO |= XMLSTREAMIO_REGISTERED ;
193 : }
194 :
195 0 : m_xUriBinding = aUriBinding ;
196 :
197 0 : return 0 ;
198 : }
199 :
200 0 : int xmlUnregisterStreamInputCallbacks( void )
201 : {
202 0 : if( ( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
203 : //Clear the uir-stream binding
204 0 : m_xUriBinding.clear() ;
205 :
206 : //disable the registered flag
207 0 : enableXmlStreamIO &= ~XMLSTREAMIO_REGISTERED ;
208 : }
209 :
210 0 : return 0 ;
211 : }
212 :
213 0 : void xmlDisableStreamInputCallbacks() {
214 0 : xmlUnregisterStreamInputCallbacks() ;
215 0 : enableXmlStreamIO &= ~XMLSTREAMIO_INITIALIZED ;
216 0 : }
217 :
218 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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