rstudio/src/cpp/core/HtmlUtils.cpp at master · andschar/rstudio · GitHub

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* HtmlUtils.cpp

* Unless you have received this program directly from RStudio pursuant

* to the terms of a commercial license agreement with RStudio, then

* this program is licensed to you under the terms of version 3 of the

* GNU Affero General Public License. This program is distributed WITHOUT

* ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,

* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the

* AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.

#include <core/HtmlUtils.hpp>

#include <core/system/System.hpp>

#include <boost/format.hpp>

#include <boost/foreach.hpp>

#include <boost/algorithm/string/predicate.hpp>

#include <core/Base64.hpp>

#include <core/FileSerializer.hpp>

#include <core/RegexUtils.hpp>

#include <core/StringUtils.hpp>

#include <core/http/Util.hpp>

namespace rstudio {

namespace core {

namespace html_utils {

HTML::HTML(const std::string& text, bool isHTML)

{

if (!isHTML)

text_ = string_utils::htmlEscape(text);

else

text_ = text;

}

std::string defaultTitle(const std::string& htmlContent)

{

boost::regex re("<[Hh]([1-6]).*?>(.*?)</[Hh]\\1>");

boost::smatch match;

if (regex_utils::search(htmlContent, match, re))

return match[2];

else

return "";

}

Base64ImageFilter::Base64ImageFilter(const FilePath& basePath)

: boost::iostreams::regex_filter(

boost::regex(

"(<\\s*[Ii][Mm][Gg] [^\\>]*[Ss][Rr][Cc]\\s*=\\s*)([\"'])(.*?)(\\2)"),

boost::bind(&Base64ImageFilter::toBase64Image, this, _1)),

basePath_(basePath)

{

}

std::string Base64ImageFilter::toBase64Image(const boost::cmatch& match)

{

// extract image reference

std::string imgRef = match[3];

// url decode it

imgRef = http::util::urlDecode(imgRef);

// see if this is an image within the base directory. if it is then

// base64 encode it

FilePath imagePath = basePath_.childPath(imgRef);

if (imagePath.exists() &&

boost::algorithm::starts_with(imagePath.mimeContentType(), "image/"))

{

std::string imageBase64;

Error error = core::base64::encode(imagePath, &imageBase64);

if (!error)

{

imgRef = "data:" + imagePath.mimeContentType() + ";base64,";

imgRef.append(imageBase64);

}

else

{

LOG_ERROR(error);

}

// return the filtered result

return match[1] + match[2] + imgRef + match[4];

}

// convert fonts to base64

CssUrlFilter::CssUrlFilter(const FilePath& basePath)

: boost::iostreams::regex_filter(

boost::regex("url\\('([^'']+)'\\)"),

boost::bind(&CssUrlFilter::toBase64Url, this, _1)),

basePath_(basePath)

{

}

std::string CssUrlFilter::toBase64Url(const boost::cmatch& match)

{

// is this a local file?

std::string urlRef = match[1];

FilePath urlPath = basePath_.childPath(urlRef);

std::string ext = urlPath.extensionLowerCase();

if (urlPath.exists() && (ext == ".ttf" || ext == ".otf"))

{

std::string fontBase64;

Error error = core::base64::encode(urlPath, &fontBase64);

if (!error)

{

// return base64 encoded font

std::string type = (ext == ".ttf") ? "truetype" : "opentype";

boost::format fmt("url(data:font/%1%;base64,%2%)");

return boost::str(fmt % type % fontBase64);

}

else

{

LOG_ERROR(error);

return match[0];

}

else

{

return match[0];

}

TextRange findClosestRange(std::string::const_iterator pos,

const std::vector<TextRange>& ranges)

{

TextRange closestRange = ranges.front();

BOOST_FOREACH(const TextRange& range, ranges)

{

if (std::abs(range.begin - pos) < std::abs(closestRange.begin - pos))

closestRange = range;

}

return closestRange;

}

void HtmlPreserver::preserve(std::string* pInput)

{

// begin and end regexes

boost::regex beginPreserve("");

boost::regex endPreserve("");

// discover ranges we need to preserve

std::vector<TextRange> ranges;

std::string::const_iterator pos = pInput->begin();

std::string::const_iterator inputEnd = pInput->end();

while (pos != inputEnd)

{

// look for begin marker

boost::smatch m;

if (regex_utils::search(pos, inputEnd, m, beginPreserve))

{

// set begin iterator

std::string::const_iterator begin = m[0].first;

std::string::const_iterator end = m[0].second;

// look for end marker

if (regex_utils::search(end, inputEnd, m, endPreserve))

{

// update end to be the end of the match

end = m[0].second;

}

else

{

// didn't find a matching end pattern so set the end to the

// end of the document -- this will cause us to exclude the

// rest of the document from processing

end = inputEnd;

}

// mark everything before the match as requiring processing

ranges.push_back(TextRange(true, pos, begin));

// add the matched range to our list

ranges.push_back(TextRange(false, begin, end));

// update the position

pos = end + 1;

}

else

{

// no more preserve regions, set termination condition

ranges.push_back(TextRange(true, pos, pInput->end()));

pos = inputEnd;

}

// substitute guids for all of the matched ranges

std::string modifiedInput;

for (std::vector<TextRange>::iterator it = ranges.begin();

it != ranges.end(); it++)

{

if (it->process)

{

modifiedInput += std::string(it->begin, it->end);

}

else

{

std::string guid = core::system::generateUuid();

std::string html = std::string(it->begin, it->end);

preserved_[guid] = html;

modifiedInput += guid;

}

// return the modified input

*pInput = modifiedInput;

}

void HtmlPreserver::restore(std::string* pOutput)

{

typedef std::pair<std::string,std::string> StringPair;

BOOST_FOREACH(const StringPair& preserve, preserved_)

{

boost::algorithm::replace_first(*pOutput,

preserve.first,

preserve.second);

}

} // namespace html_utils

} // namespace core

} // namespace rstudio

rstudio/src/cpp/core/HtmlUtils.cpp at master · andschar/rstudio · GitHub

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