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31 // How we handle the base tag better.
33 // At now the normal way we use to handling base tag is
34 // a) For those links which have corresponding local saved files, such as
35 // savable CSS, JavaScript files, they will be written to relative URLs which
36 // point to local saved file. Why those links can not be resolved as absolute
37 // file URLs, because if they are resolved as absolute URLs, after moving the
38 // file location from one directory to another directory, the file URLs will
40 // b) For those links which have not corresponding local saved files, such as
41 // links in A, AREA tags, they will be resolved as absolute URLs.
42 // c) We comment all base tags when serialzing DOM for the page.
43 // FireFox also uses above way to handle base tag.
46 // This way can not handle the following situation:
47 // the base tag is written by JavaScript.
48 // For example. The page "www.yahoo.com" use
49 // "document.write('<base href="http://www.yahoo.com/"...');" to setup base URL
50 // of page when loading page. So when saving page as completed-HTML, we assume
51 // that we save "www.yahoo.com" to "c:\yahoo.htm". After then we load the saved
52 // completed-HTML page, then the JavaScript will insert a base tag
53 // <base href="http://www.yahoo.com/"...> to DOM, so all URLs which point to
54 // local saved resource files will be resolved as
55 // "http://www.yahoo.com/yahoo_files/...", which will cause all saved resource
56 // files can not be loaded correctly. Also the page will be rendered ugly since
57 // all saved sub-resource files (such as CSS, JavaScript files) and sub-frame
58 // files can not be fetched.
59 // Now FireFox, IE and WebKit based Browser all have this problem.
62 // My solution is that we comment old base tag and write new base tag:
63 // <base href="." ...> after the previous commented base tag. In WebKit, it
64 // always uses the latest "href" attribute of base tag to set document's base
65 // URL. Based on this behavior, when we encounter a base tag, we comment it and
66 // write a new base tag <base href="."> after the previous commented base tag.
67 // The new added base tag can help engine to locate correct base URL for
68 // correctly loading local saved resource files. Also I think we need to inherit
69 // the base target value from document object when appending new base tag.
70 // If there are multiple base tags in original document, we will comment all old
71 // base tags and append new base tag after each old base tag because we do not
72 // know those old base tags are original content or added by JavaScript. If
73 // they are added by JavaScript, it means when loading saved page, the script(s)
74 // will still insert base tag(s) to DOM, so the new added base tag(s) can
75 // override the incorrect base URL and make sure we alway load correct local
76 // saved resource files.
79 #include "web/WebPageSerializerImpl.h"
81 #include "core/HTMLNames.h"
82 #include "core/dom/Document.h"
83 #include "core/dom/DocumentType.h"
84 #include "core/dom/Element.h"
85 #include "core/editing/markup.h"
86 #include "core/html/HTMLAllCollection.h"
87 #include "core/html/HTMLElement.h"
88 #include "core/html/HTMLFormElement.h"
89 #include "core/html/HTMLHtmlElement.h"
90 #include "core/html/HTMLMetaElement.h"
91 #include "core/loader/DocumentLoader.h"
92 #include "core/loader/FrameLoader.h"
93 #include "public/platform/WebVector.h"
94 #include "web/WebLocalFrameImpl.h"
95 #include "wtf/text/TextEncoding.h"
99 // Maximum length of data buffer which is used to temporary save generated
100 // html content data. This is a soft limit which might be passed if a very large
101 // contegious string is found in the page.
102 static const unsigned dataBufferCapacity = 65536;
104 WebPageSerializerImpl::SerializeDomParam::SerializeDomParam(const KURL& url,
105 const WTF::TextEncoding& textEncoding,
107 const String& directoryName)
109 , textEncoding(textEncoding)
111 , directoryName(directoryName)
112 , isHTMLDocument(document->isHTMLDocument())
113 , haveSeenDocType(false)
114 , haveAddedCharsetDeclaration(false)
116 , isInScriptOrStyleTag(false)
117 , haveAddedXMLProcessingDirective(false)
118 , haveAddedContentsBeforeEnd(false)
122 String WebPageSerializerImpl::preActionBeforeSerializeOpenTag(
123 const Element* element, SerializeDomParam* param, bool* needSkip)
125 StringBuilder result;
128 if (param->isHTMLDocument) {
129 // Skip the open tag of original META tag which declare charset since we
130 // have overrided the META which have correct charset declaration after
131 // serializing open tag of HEAD element.
133 if (isHTMLMetaElement(*element)) {
134 const HTMLMetaElement& meta = toHTMLMetaElement(*element);
135 // Check whether the META tag has declared charset or not.
136 String equiv = meta.httpEquiv();
137 if (equalIgnoringCase(equiv, "content-type")) {
138 String content = meta.content();
139 if (content.length() && content.contains("charset", false)) {
140 // Find META tag declared charset, we need to skip it when
142 param->skipMetaElement = element;
146 } else if (isHTMLHtmlElement(*element)) {
147 // Check something before processing the open tag of HEAD element.
148 // First we add doc type declaration if original document has it.
149 if (!param->haveSeenDocType) {
150 param->haveSeenDocType = true;
151 result.append(createMarkup(param->document->doctype()));
154 // Add MOTW declaration before html tag.
155 // See http://msdn2.microsoft.com/en-us/library/ms537628(VS.85).aspx.
156 result.append(WebPageSerializer::generateMarkOfTheWebDeclaration(param->url));
157 } else if (isHTMLBaseElement(*element)) {
158 // Comment the BASE tag when serializing dom.
159 result.appendLiteral("<!--");
162 // Write XML declaration.
163 if (!param->haveAddedXMLProcessingDirective) {
164 param->haveAddedXMLProcessingDirective = true;
165 // Get encoding info.
166 String xmlEncoding = param->document->xmlEncoding();
167 if (xmlEncoding.isEmpty())
168 xmlEncoding = param->document->encodingName();
169 if (xmlEncoding.isEmpty())
170 xmlEncoding = UTF8Encoding().name();
171 result.appendLiteral("<?xml version=\"");
172 result.append(param->document->xmlVersion());
173 result.appendLiteral("\" encoding=\"");
174 result.append(xmlEncoding);
175 if (param->document->xmlStandalone())
176 result.appendLiteral("\" standalone=\"yes");
177 result.appendLiteral("\"?>\n");
179 // Add doc type declaration if original document has it.
180 if (!param->haveSeenDocType) {
181 param->haveSeenDocType = true;
182 result.append(createMarkup(param->document->doctype()));
185 return result.toString();
188 String WebPageSerializerImpl::postActionAfterSerializeOpenTag(
189 const Element* element, SerializeDomParam* param)
191 StringBuilder result;
193 param->haveAddedContentsBeforeEnd = false;
194 if (!param->isHTMLDocument)
195 return result.toString();
196 // Check after processing the open tag of HEAD element
197 if (!param->haveAddedCharsetDeclaration
198 && isHTMLHeadElement(*element)) {
199 param->haveAddedCharsetDeclaration = true;
200 // Check meta element. WebKit only pre-parse the first 512 bytes
201 // of the document. If the whole <HEAD> is larger and meta is the
202 // end of head part, then this kind of pages aren't decoded correctly
203 // because of this issue. So when we serialize the DOM, we need to
204 // make sure the meta will in first child of head tag.
205 // See http://bugs.webkit.org/show_bug.cgi?id=16621.
206 // First we generate new content for writing correct META element.
207 result.append(WebPageSerializer::generateMetaCharsetDeclaration(
208 String(param->textEncoding.name())));
210 param->haveAddedContentsBeforeEnd = true;
211 // Will search each META which has charset declaration, and skip them all
212 // in PreActionBeforeSerializeOpenTag.
213 } else if (isHTMLScriptElement(*element) || isHTMLScriptElement(*element)) {
214 param->isInScriptOrStyleTag = true;
217 return result.toString();
220 String WebPageSerializerImpl::preActionBeforeSerializeEndTag(
221 const Element* element, SerializeDomParam* param, bool* needSkip)
226 if (!param->isHTMLDocument)
228 // Skip the end tag of original META tag which declare charset.
229 // Need not to check whether it's META tag since we guarantee
230 // skipMetaElement is definitely META tag if it's not 0.
231 if (param->skipMetaElement == element) {
233 } else if (isHTMLScriptElement(*element) || isHTMLScriptElement(*element)) {
234 ASSERT(param->isInScriptOrStyleTag);
235 param->isInScriptOrStyleTag = false;
241 // After we finish serializing end tag of a element, we give the target
242 // element a chance to do some post work to add some additional data.
243 String WebPageSerializerImpl::postActionAfterSerializeEndTag(
244 const Element* element, SerializeDomParam* param)
246 StringBuilder result;
248 if (!param->isHTMLDocument)
249 return result.toString();
250 // Comment the BASE tag when serializing DOM.
251 if (isHTMLBaseElement(*element)) {
252 result.appendLiteral("-->");
253 // Append a new base tag declaration.
254 result.append(WebPageSerializer::generateBaseTagDeclaration(
255 param->document->baseTarget()));
258 return result.toString();
261 void WebPageSerializerImpl::saveHTMLContentToBuffer(
262 const String& result, SerializeDomParam* param)
264 m_dataBuffer.append(result);
265 encodeAndFlushBuffer(WebPageSerializerClient::CurrentFrameIsNotFinished,
270 void WebPageSerializerImpl::encodeAndFlushBuffer(
271 WebPageSerializerClient::PageSerializationStatus status,
272 SerializeDomParam* param,
273 FlushOption flushOption)
275 // Data buffer is not full nor do we want to force flush.
276 if (flushOption != ForceFlush && m_dataBuffer.length() <= dataBufferCapacity)
279 String content = m_dataBuffer.toString();
280 m_dataBuffer.clear();
282 CString encodedContent = param->textEncoding.normalizeAndEncode(content, WTF::EntitiesForUnencodables);
284 // Send result to the client.
285 m_client->didSerializeDataForFrame(param->url,
286 WebCString(encodedContent.data(), encodedContent.length()),
290 void WebPageSerializerImpl::openTagToString(Element* element,
291 SerializeDomParam* param)
294 StringBuilder result;
295 // Do pre action for open tag.
296 result.append(preActionBeforeSerializeOpenTag(element, param, &needSkip));
301 result.append(element->nodeName().lower());
302 // Go through all attributes and serialize them.
303 AttributeCollection attributes = element->attributes();
304 AttributeCollection::iterator end = attributes.end();
305 for (AttributeCollection::iterator it = attributes.begin(); it != end; ++it) {
307 // Add attribute pair
308 result.append(it->name().toString());
309 result.appendLiteral("=\"");
310 if (!it->value().isEmpty()) {
311 const String& attrValue = it->value();
313 // Check whether we need to replace some resource links
314 // with local resource paths.
315 const QualifiedName& attrName = it->name();
316 if (element->hasLegalLinkAttribute(attrName)) {
317 // For links start with "javascript:", we do not change it.
318 if (attrValue.startsWith("javascript:", false)) {
319 result.append(attrValue);
321 // Get the absolute link
322 WebLocalFrameImpl* subFrame = WebLocalFrameImpl::fromFrameOwnerElement(element);
323 String completeURL = subFrame ? subFrame->frame()->document()->url() :
324 param->document->completeURL(attrValue);
325 // Check whether we have local files for those link.
326 if (m_localLinks.contains(completeURL)) {
327 if (!param->directoryName.isEmpty()) {
328 result.appendLiteral("./");
329 result.append(param->directoryName);
332 result.append(m_localLinks.get(completeURL));
334 result.append(completeURL);
338 if (param->isHTMLDocument)
339 result.append(m_htmlEntities.convertEntitiesInString(attrValue));
341 result.append(m_xmlEntities.convertEntitiesInString(attrValue));
347 // Do post action for open tag.
348 String addedContents = postActionAfterSerializeOpenTag(element, param);
349 // Complete the open tag for element when it has child/children.
350 if (element->hasChildren() || param->haveAddedContentsBeforeEnd)
352 // Append the added contents generate in post action of open tag.
353 result.append(addedContents);
354 // Save the result to data buffer.
355 saveHTMLContentToBuffer(result.toString(), param);
358 // Serialize end tag of an specified element.
359 void WebPageSerializerImpl::endTagToString(Element* element,
360 SerializeDomParam* param)
363 StringBuilder result;
364 // Do pre action for end tag.
365 result.append(preActionBeforeSerializeEndTag(element, param, &needSkip));
368 // Write end tag when element has child/children.
369 if (element->hasChildren() || param->haveAddedContentsBeforeEnd) {
370 result.appendLiteral("</");
371 result.append(element->nodeName().lower());
374 // Check whether we have to write end tag for empty element.
375 if (param->isHTMLDocument) {
377 // FIXME: This code is horribly wrong. WebPageSerializerImpl must die.
378 if (!element->isHTMLElement() || !toHTMLElement(element)->ieForbidsInsertHTML()) {
379 // We need to write end tag when it is required.
380 result.appendLiteral("</");
381 result.append(element->nodeName().lower());
385 // For xml base document.
386 result.appendLiteral(" />");
389 // Do post action for end tag.
390 result.append(postActionAfterSerializeEndTag(element, param));
391 // Save the result to data buffer.
392 saveHTMLContentToBuffer(result.toString(), param);
395 void WebPageSerializerImpl::buildContentForNode(Node* node,
396 SerializeDomParam* param)
398 switch (node->nodeType()) {
399 case Node::ELEMENT_NODE:
400 // Process open tag of element.
401 openTagToString(toElement(node), param);
402 // Walk through the children nodes and process it.
403 for (Node *child = node->firstChild(); child; child = child->nextSibling())
404 buildContentForNode(child, param);
405 // Process end tag of element.
406 endTagToString(toElement(node), param);
408 case Node::TEXT_NODE:
409 saveHTMLContentToBuffer(createMarkup(node), param);
411 case Node::ATTRIBUTE_NODE:
412 case Node::DOCUMENT_NODE:
413 case Node::DOCUMENT_FRAGMENT_NODE:
415 ASSERT_NOT_REACHED();
417 // Document type node can be in DOM?
418 case Node::DOCUMENT_TYPE_NODE:
419 param->haveSeenDocType = true;
421 // For other type node, call default action.
422 saveHTMLContentToBuffer(createMarkup(node), param);
427 WebPageSerializerImpl::WebPageSerializerImpl(WebFrame* frame,
428 bool recursiveSerialization,
429 WebPageSerializerClient* client,
430 const WebVector<WebURL>& links,
431 const WebVector<WebString>& localPaths,
432 const WebString& localDirectoryName)
434 , m_recursiveSerialization(recursiveSerialization)
435 , m_framesCollected(false)
436 , m_localDirectoryName(localDirectoryName)
437 , m_htmlEntities(false)
438 , m_xmlEntities(true)
440 // Must specify available webframe.
442 m_specifiedWebLocalFrameImpl = toWebLocalFrameImpl(frame);
443 // Make sure we have non 0 client.
445 // Build local resources map.
446 ASSERT(links.size() == localPaths.size());
447 for (size_t i = 0; i < links.size(); i++) {
449 ASSERT(!m_localLinks.contains(url.string()));
450 m_localLinks.set(url.string(), localPaths[i]);
453 ASSERT(m_dataBuffer.isEmpty());
456 void WebPageSerializerImpl::collectTargetFrames()
458 ASSERT(!m_framesCollected);
459 m_framesCollected = true;
461 // First, process main frame.
462 m_frames.append(m_specifiedWebLocalFrameImpl);
463 // Return now if user only needs to serialize specified frame, not including
465 if (!m_recursiveSerialization)
467 // Collect all frames inside the specified frame.
468 for (int i = 0; i < static_cast<int>(m_frames.size()); ++i) {
469 WebLocalFrameImpl* currentFrame = m_frames[i];
470 // Get current using document.
471 Document* currentDoc = currentFrame->frame()->document();
472 // Go through sub-frames.
473 RefPtrWillBeRawPtr<HTMLAllCollection> all = currentDoc->all();
475 for (unsigned i = 0; Element* element = all->item(i); ++i) {
476 if (!element->isHTMLElement())
478 WebLocalFrameImpl* webFrame =
479 WebLocalFrameImpl::fromFrameOwnerElement(element);
481 m_frames.append(webFrame);
486 bool WebPageSerializerImpl::serialize()
488 if (!m_framesCollected)
489 collectTargetFrames();
491 bool didSerialization = false;
492 KURL mainURL = m_specifiedWebLocalFrameImpl->frame()->document()->url();
494 for (unsigned i = 0; i < m_frames.size(); ++i) {
495 WebLocalFrameImpl* webFrame = m_frames[i];
496 Document* document = webFrame->frame()->document();
497 const KURL& url = document->url();
499 if (!url.isValid() || !m_localLinks.contains(url.string()))
502 didSerialization = true;
504 const WTF::TextEncoding& textEncoding = document->encoding().isValid() ? document->encoding() : UTF8Encoding();
505 String directoryName = url == mainURL ? m_localDirectoryName : "";
507 SerializeDomParam param(url, textEncoding, document, directoryName);
509 Element* documentElement = document->documentElement();
511 buildContentForNode(documentElement, ¶m);
513 encodeAndFlushBuffer(WebPageSerializerClient::CurrentFrameIsFinished, ¶m, ForceFlush);
516 ASSERT(m_dataBuffer.isEmpty());
517 m_client->didSerializeDataForFrame(KURL(), WebCString("", 0), WebPageSerializerClient::AllFramesAreFinished);
518 return didSerialization;