Class: WSS4R::Security::Util::XmlCanonicalizer

Inherits:
Object
  • Object
show all
Defined in:
lib/wss4r/security/util/xmlcanonicalizer.rb

Constant Summary collapse

BEFORE_DOC_ELEMENT = 
0
INSIDE_DOC_ELEMENT = 
1
AFTER_DOC_ELEMENT = 
2
NODE_TYPE_ATTRIBUTE = 
3
NODE_TYPE_WHITESPACE = 
4
NODE_TYPE_COMMENT = 
5
NODE_TYPE_PI = 
6
NODE_TYPE_TEXT = 
7

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(with_comments, excl_c14n) ⇒ XmlCanonicalizer

Returns a new instance of XmlCanonicalizer.



96
97
98
99
100
101
102
103
104
105
106
107
108
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 96

def initialize(with_comments, excl_c14n)
  @with_comments = with_comments
  @exclusive = excl_c14n
  @res = ""
  @state = BEFORE_DOC_ELEMENT
  @xnl = Array.new()
  @prevVisibleNamespacesStart = 0
  @prevVisibleNamespacesEnd = 0
  @visibleNamespaces = Array.new()
			 @inclusive_namespaces = Array.new()
  @prefix_list = nil
			 @rendered_prefixes = Array.new()
end

Instance Attribute Details

#prefix_list ⇒ Object

Returns the value of attribute prefix_list.



83
84
85
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 83

def prefix_list
  @prefix_list
end

Instance Method Details

#add_inclusive_namespaces(prefix_list, element, visible_namespaces) ⇒ Object 



110
111
112
113
114
115
116
117
118
119
120
121
122
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 110

def add_inclusive_namespaces(prefix_list, element, visible_namespaces)
  namespaces = element.attributes()
  namespaces.each_attribute{|ns|
    if (ns.prefix=="xmlns")
      if (prefix_list.include?(ns.local_name()))
        visible_namespaces.push(NamespaceNode.new("xmlns:"+ns.local_name(), ns.value()))
      end
    end
  }
  parent = element.parent()
  add_inclusive_namespaces(prefix_list, parent, visible_namespaces) if (parent)
  visible_namespaces
end

#canonicalize(document) ⇒ Object 



124
125
126
127
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 124

def canonicalize(document)
  write_document_node(document)
  @res
end

#canonicalize_element(element) ⇒ Object 



129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 129

def canonicalize_element(element)
  @inclusive_namespaces = add_inclusive_namespaces(@prefix_list, element, @inclusive_namespaces) if (@prefix_list)
  @preserve_document = element.document()
  tmp_parent = element.parent()
  body_string = remove_whitespace(element.to_s().gsub("\n","").gsub("\t","").gsub("\r",""))
  document = Document.new(body_string)
  tmp_parent.delete_element(element)
  element = tmp_parent.add_element(document.root())
  @preserve_element = element
  document = Document.new(element.to_s())
  ns = element.namespace(element.prefix())
  document.root().add_namespace(element.prefix(), ns)
  write_document_node(document)
  @res
end

#is_namespace_decl(attribute) ⇒ Object 



367
368
369
370
371
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 367

def is_namespace_decl(attribute)
  #return true if (attribute.name() == "xmlns")
  return true if (attribute.prefix().index("xmlns") == 0)
  return false
end

#is_namespace_node(namespace_uri) ⇒ Object 



294
295
296
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 294

def is_namespace_node(namespace_uri)
  return (namespace_uri == "http://www.w3.org/2000/xmlns/")
end

#is_namespace_rendered(prefix, uri) ⇒ Object 



298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 298

def is_namespace_rendered(prefix, uri)
  is_empty_ns = prefix == nil && uri == nil
  if (is_empty_ns)
    start = 0
  else
    start = @prevVisibleNamespacesStart
  end
  @visibleNamespaces.each{|ns|
    if (ns.prefix() == "xmlns:"+prefix.to_s() && ns.uri() == uri)
      return true
    end
  }
  return is_empty_ns
  #(@visibleNamespaces.size()-1).downto(start) {|i|
  #   ns = @visibleNamespaces[i]
  #	return true if (ns.prefix() == "xmlns:"+prefix.to_s() && ns.uri() == uri)
  #	#p = ns.prefix() if (ns.prefix().index("xmlns") == 0) 
  #	#return ns.uri() == uri if (p == prefix) 
  #}
  #return is_empty_ns
end

#is_node_visible(node) ⇒ Object 



320
321
322
323
324
325
326
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 320

def is_node_visible(node)
  return true if (@xnl.size() == 0)
  @xnl.each{|element|
    return true if (element == node)
  }
  return false
end

#is_text_node(type) ⇒ Object 



373
374
375
376
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 373

def is_text_node(type)
  return true if (type == NODE_TYPE_TEXT || type == NODE_TYPE_CDATA || type == NODE_TYPE_WHITESPACE)
  return false
end

#normalize_string(input, type) ⇒ Object 



328
329
330
331
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 328

def normalize_string(input, type)
  sb = ""
  return input
end

#remove_whitespace(string) ⇒ Object 



378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 378

def remove_whitespace(string)
  new_string = ""
  in_white = false
  string.each_byte{|b|
    #if (in_white && b == 32)
    #else
    if !(in_white && b == 32)
      new_string = new_string + b.chr()
    end
    if (b == 62) #>
      in_white = true
    end
    if (b == 60) #<
      in_white = false
    end
  }
  new_string
end

#white_text?(text) ⇒ Boolean

Returns:

  • (Boolean) 


362
363
364
365
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 362

def white_text?(text)
  return true if ((text.strip() == "") || (text.strip() == nil))
  return false
end

#write_attribute_axis(node) ⇒ Object 



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
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 253

def write_attribute_axis(node)
  list = Array.new()
  #node.attributes().each_attribute{|attr|
   # list.push(attr) if (!is_namespace_node(attr.value()) && !is_namespace_decl(attr)) # && is_node_visible(
  #}
  node.attributes().sort().each{|key, attr|
    list.push(attr) if (!is_namespace_node(attr.value()) && !is_namespace_decl(attr)) # && is_node_visible(
  }

  if (!@exclusive && node.parent() != nil && node.parent().parent() != nil)
    cur = node.parent()
    while (cur != nil)
      #next if (cur.attributes() == nil)
      cur.each_attribute{|attribute|
        next if (attribute.prefix() != "xml")
        next if (attribute.prefix().index("xmlns") == 0)
        next if (node.namespace(attribute.prefix()) == attribute.value())
        found = true
        list.each{|n|
          if (n.prefix() == "xml" && n.value() == attritbute.value())
            found = true
            break
          end
        }
        next if (found)
        list.push(attribute)
      }
    end
  end
  list.each{|attribute|
    if (attribute != nil)
      if (attribute.name() != "xmlns")
        @res = @res + " " + normalize_string(attribute.to_string(), NODE_TYPE_ATTRIBUTE).gsub("'",'"')
      end
      #	else
      #	@res = @res + " " + normalize_string(attribute.name()+'="'+attribute.to_s()+'"', NODE_TYPE_ATTRIBUTE).gsub("'",'"')
      #end
    end
  }
end

#write_document_node(document) ⇒ Object 



145
146
147
148
149
150
151
152
153
154
155
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 145

def write_document_node(document)
  @state = BEFORE_DOC_ELEMENT
  if (document.class().to_s() == "REXML::Element")
    write_node(document)
  else
    document.each_child{|child|
      write_node(child)
    }
  end
  @res
end

#write_element_node(node, visible) ⇒ Object 



182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 182

def write_element_node(node, visible)
  savedPrevVisibleNamespacesStart = @prevVisibleNamespacesStart
  savedPrevVisibleNamespacesEnd = @prevVisibleNamespacesEnd
  savedVisibleNamespacesSize = @visibleNamespaces.size()
  state = @state
  state = INSIDE_DOC_ELEMENT if (visible && state == BEFORE_DOC_ELEMENT)
  @res = @res + "<" + node.expanded_name() if (visible)
  write_namespace_axis(node, visible)
  write_attribute_axis(node)
  @res = @res + ">" if (visible)
  node.each_child{|child|
			 	write_node(child)
			 }
  @res = @res + "</" +node.expanded_name() + ">" if (visible)
  @state = AFTER_DOC_ELEMENT if (visible && state == BEFORE_DOC_ELEMENT)
  @prevVisibleNamespacesStart = savedPrevVisibleNamespacesStart
  @prevVisibleNamespacesEnd = savedPrevVisibleNamespacesEnd
  @visibleNamespaces.slice!(savedVisibleNamespacesSize, @visibleNamespaces.size() - savedVisibleNamespacesSize) 		if (@visibleNamespaces.size() > savedVisibleNamespacesSize)
end

#write_namespace_axis(node, visible) ⇒ Object 



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
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 202

def write_namespace_axis(node, visible)
  doc = node.document()
  has_empty_namespace = false
  list = Array.new()
  cur = node
  #while ((cur != nil) && (cur != doc) && (cur.node_type() != :document)) 
  namespaces = cur.node_namespaces()
  namespaces.each{|prefix|
    next if ((prefix == "xmlns") && (node.namespace(prefix) == "")) 
    namespace = cur.namespace(prefix)
    next if (is_namespace_node(namespace))
    next if (node.namespace(prefix) != cur.namespace(prefix))
    next if (prefix == "xml" && namespace == "http://www.w3.org/XML/1998/namespace")
    next if (!is_node_visible(cur))
    rendered = is_namespace_rendered(prefix, namespace)
    @visibleNamespaces.push(NamespaceNode.new("xmlns:"+prefix,namespace)) if (visible)
    if ((!rendered) && !list.include?(prefix))
      list.push(prefix)
    end
    has_empty_namespace = true if (prefix == nil)
  }
  if (visible && !has_empty_namespace && !is_namespace_rendered(nil, nil)) 
    @res = @res + ' xmlns=""'
  end
  #TODO: ns of inclusive_list
#=begin
  if ((@prefix_list) && (node.to_s() == node.parent().to_s()))
    #list.push(node.prefix())
    @inclusive_namespaces.each{|ns|
      prefix = ns.prefix().split(":")[1]
      list.push(prefix) if (!list.include?(prefix) && (!node.attributes.prefixes.include?(prefix))) 
    }
				@prefix_list = nil
  end
#=end
  list.sort!()
  list.each{|prefix|
    next if (prefix == "")
				next if (@rendered_prefixes.include?(prefix))
				@rendered_prefixes.push(prefix)
    ns = node.namespace(prefix)
    ns = @preserve_element.namespace(prefix) if (ns == nil)
    @res = @res + normalize_string(" " + prefix + '="' + ns + '"', NODE_TYPE_TEXT) if (prefix == "xmlns")
    @res = @res + normalize_string(" xmlns:" + prefix + '="' + ns + '"', NODE_TYPE_TEXT) if (prefix != nil && prefix != "xmlns")
  }
  if (visible)
    @prevVisibleNamespacesStart = @prevVisibleNamespacesEnd
    @prevVisibleNamespacesEnd = @visibleNamespaces.size()	
  end
end

#write_node(node) ⇒ Object 



157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 157

def write_node(node)
  visible = is_node_visible(node)
  if ((node.node_type() == :text) && white_text?(node.value()))
    res = node.value()
    res.gsub("\r\n","\n")
    #res = res.delete(" ").delete("\t")
    res.delete("\r")
    @res = @res + res
    #write_text_node(node,visible) if (@state == INSIDE_DOC_ELEMENT)
    return
  end
  if (node.node_type() == :text)
    write_text_node(node, visible)
    return
  end		
  if (node.node_type() == :element)
    write_element_node(node, visible) if (!node.rendered?())
				node.rendered=(true)
  end
  if (node.node_type() == :processing_instruction)
  end
  if (node.node_type() == :comment)
  end
end

#write_text_node(node, visible) ⇒ Object

input.each_byte{|b| if (b ==60 && (type == NODE_TYPE_ATTRIBUTE || is_text_node(type))) sb = sb + “&lt;” elsif (b == 62 && is_text_node(type)) sb = sb + “&gt;” elsif (b == 38 && (is_text_node(type) || is_text_node(type))) #Ampersand sb = sb + “&amp;” elsif (b == 34 && is_text_node(type)) #Quote sb = sb + “&quot;” elsif (b == 9 && is_text_node(type)) #Tabulator sb = sb + “&#x9;” elsif (b == 11 && is_text_node(type)) #CR sb = sb + “&#xA;” elsif (b == 13 && (type == NODE_TYPE_ATTRIBUTE || (is_text_node(type) && type != NODE_TYPE_WHITESPACE) || type == NODE_TYPE_COMMENT || type == NODE_TYPE_PI)) sb = sb + “&#xD;” elsif (b == 13) next else sb = sb.concat(b) end } sb end



356
357
358
359
360
 
# File 'lib/wss4r/security/util/xmlcanonicalizer.rb', line 356

def write_text_node(node, visible)
  if (visible)
    @res = @res + normalize_string(node.value(), node.node_type())
  end
end