widget/nsHTMLFormatConverter.cpp
author Doug Turner <doug.turner@gmail.com>
Tue, 03 Feb 2015 17:00:00 +0100
changeset 243715 840987c23fc597bdaad4567c2387ba1aa06c65d0
parent 236314 41c37790896e424e2743811d3d19be00068ce941
child 361024 bd7461a1ed09447f4d38b4911f0e83933f9d875b
permissions -rw-r--r--
Bug 1045229 - Beacons are not associated with windows. The current window based filtering that the network monitor does will skip requests that come from sendBeacon(). Here we explictly look to see if the network channel is from beacon by looking at the loadinfo. r=dcamp, a=sledru

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsHTMLFormatConverter.h"

#include "nsCRT.h"
#include "nsISupportsArray.h"
#include "nsIComponentManager.h"
#include "nsCOMPtr.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"

#include "nsITransferable.h" // for mime defs, this is BAD

// HTML convertor stuff
#include "nsPrimitiveHelpers.h"
#include "nsIDocumentEncoder.h"
#include "nsContentUtils.h"

nsHTMLFormatConverter::nsHTMLFormatConverter()
{
}

nsHTMLFormatConverter::~nsHTMLFormatConverter()
{
}

NS_IMPL_ISUPPORTS(nsHTMLFormatConverter, nsIFormatConverter)

//
// GetInputDataFlavors
//
// Creates a new list and returns the list of all the flavors this converter
// knows how to import. In this case, it's just HTML.
//
// Flavors (strings) are wrapped in a primitive object so that JavaScript can
// access them easily via XPConnect.
//
NS_IMETHODIMP
nsHTMLFormatConverter::GetInputDataFlavors(nsISupportsArray **_retval)
{
  if ( !_retval )
    return NS_ERROR_INVALID_ARG;
  
  nsresult rv = NS_NewISupportsArray ( _retval );  // addrefs for us
  if ( NS_SUCCEEDED(rv) )
    rv = AddFlavorToList ( *_retval, kHTMLMime );
  
  return rv;
  
} // GetInputDataFlavors


//
// GetOutputDataFlavors
//
// Creates a new list and returns the list of all the flavors this converter
// knows how to export (convert). In this case, it's all sorts of things that HTML can be
// converted to.
//
// Flavors (strings) are wrapped in a primitive object so that JavaScript can
// access them easily via XPConnect.
//
NS_IMETHODIMP
nsHTMLFormatConverter::GetOutputDataFlavors(nsISupportsArray **_retval)
{
  if ( !_retval )
    return NS_ERROR_INVALID_ARG;
  
  nsresult rv = NS_NewISupportsArray ( _retval );  // addrefs for us
  if ( NS_SUCCEEDED(rv) ) {
    rv = AddFlavorToList ( *_retval, kHTMLMime );
    if ( NS_FAILED(rv) )
      return rv;
#if NOT_NOW
// pinkerton
// no one uses this flavor right now, so it's just slowing things down. If anyone cares I
// can put it back in.
    rv = AddFlavorToList ( *_retval, kAOLMailMime );
    if ( NS_FAILED(rv) )
      return rv;
#endif
    rv = AddFlavorToList ( *_retval, kUnicodeMime );
    if ( NS_FAILED(rv) )
      return rv;
  }
  return rv;

} // GetOutputDataFlavors


//
// AddFlavorToList
//
// Convenience routine for adding a flavor wrapped in an nsISupportsCString object
// to a list
//
nsresult
nsHTMLFormatConverter :: AddFlavorToList ( nsISupportsArray* inList, const char* inFlavor )
{
  nsresult rv;
  
  nsCOMPtr<nsISupportsCString> dataFlavor =
      do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID, &rv);
  if ( dataFlavor ) {
    dataFlavor->SetData ( nsDependentCString(inFlavor) );
    // add to list as an nsISupports so the correct interface gets the addref
    // in AppendElement()
    nsCOMPtr<nsISupports> genericFlavor ( do_QueryInterface(dataFlavor) );
    inList->AppendElement ( genericFlavor);
  }
  return rv;

} // AddFlavorToList


//
// CanConvert
//
// Determines if we support the given conversion. Currently, this method only
// converts from HTML to others.
//
NS_IMETHODIMP
nsHTMLFormatConverter::CanConvert(const char *aFromDataFlavor, const char *aToDataFlavor, bool *_retval)
{
  if ( !_retval )
    return NS_ERROR_INVALID_ARG;

  *_retval = false;
  if ( !nsCRT::strcmp(aFromDataFlavor, kHTMLMime) ) {
    if ( !nsCRT::strcmp(aToDataFlavor, kHTMLMime) )
      *_retval = true;
    else if ( !nsCRT::strcmp(aToDataFlavor, kUnicodeMime) )
      *_retval = true;
#if NOT_NOW
// pinkerton
// no one uses this flavor right now, so it's just slowing things down. If anyone cares I
// can put it back in.
    else if ( toFlavor.Equals(kAOLMailMime) )
      *_retval = true;
#endif
  }
  return NS_OK;

} // CanConvert



//
// Convert
//
// Convert data from one flavor to another. The data is wrapped in primitive objects so that it is
// accessible from JS. Currently, this only accepts HTML input, so anything else is invalid.
//
//XXX This method copies the data WAAAAY too many time for my liking. Grrrrrr. Mostly it's because
//XXX we _must_ put things into nsStrings so that the parser will accept it. Lame lame lame lame. We
//XXX also can't just get raw unicode out of the nsString, so we have to allocate heap to get
//XXX unicode out of the string. Lame lame lame.
//
NS_IMETHODIMP
nsHTMLFormatConverter::Convert(const char *aFromDataFlavor, nsISupports *aFromData, uint32_t aDataLen, 
                               const char *aToDataFlavor, nsISupports **aToData, uint32_t *aDataToLen)
{
  if ( !aToData || !aDataToLen )
    return NS_ERROR_INVALID_ARG;

  nsresult rv = NS_OK;
  *aToData = nullptr;
  *aDataToLen = 0;

  if ( !nsCRT::strcmp(aFromDataFlavor, kHTMLMime) ) {
    nsAutoCString toFlavor ( aToDataFlavor );

    // HTML on clipboard is going to always be double byte so it will be in a primitive
    // class of nsISupportsString. Also, since the data is in two byte chunks the 
    // length represents the length in 1-byte chars, so we need to divide by two.
    nsCOMPtr<nsISupportsString> dataWrapper0 ( do_QueryInterface(aFromData) );
    if (!dataWrapper0) {
      return NS_ERROR_INVALID_ARG;
    }

    nsAutoString dataStr;
    dataWrapper0->GetData ( dataStr );  //��� COPY #1
    // note: conversion to text/plain is done inside the clipboard. we do not need to worry 
    // about it here.
    if ( toFlavor.Equals(kHTMLMime) || toFlavor.Equals(kUnicodeMime) ) {
      nsresult res;
      if (toFlavor.Equals(kHTMLMime)) {
        int32_t dataLen = dataStr.Length() * 2;
        nsPrimitiveHelpers::CreatePrimitiveForData ( toFlavor.get(), dataStr.get(), dataLen, aToData );
        if ( *aToData )
          *aDataToLen = dataLen;
      } else {
        nsAutoString outStr;
        res = ConvertFromHTMLToUnicode(dataStr, outStr);
        if (NS_SUCCEEDED(res)) {
          int32_t dataLen = outStr.Length() * 2;
          nsPrimitiveHelpers::CreatePrimitiveForData ( toFlavor.get(), outStr.get(), dataLen, aToData );
          if ( *aToData ) 
            *aDataToLen = dataLen;
        }
      }
    } // else if HTML or Unicode
    else if ( toFlavor.Equals(kAOLMailMime) ) {
      nsAutoString outStr;
      if ( NS_SUCCEEDED(ConvertFromHTMLToAOLMail(dataStr, outStr)) ) {
        int32_t dataLen = outStr.Length() * 2;
        nsPrimitiveHelpers::CreatePrimitiveForData ( toFlavor.get(), outStr.get(), dataLen, aToData );
        if ( *aToData ) 
          *aDataToLen = dataLen;
      }
    } // else if AOL mail
    else {
      rv = NS_ERROR_FAILURE;
    }
  } // if we got html mime
  else
    rv = NS_ERROR_FAILURE;      
    
  return rv;
  
} // Convert


//
// ConvertFromHTMLToUnicode
//
// Takes HTML and converts it to plain text but in unicode.
//
NS_IMETHODIMP
nsHTMLFormatConverter::ConvertFromHTMLToUnicode(const nsAutoString & aFromStr, nsAutoString & aToStr)
{
  return nsContentUtils::ConvertToPlainText(aFromStr,
    aToStr,
    nsIDocumentEncoder::OutputSelectionOnly |
    nsIDocumentEncoder::OutputAbsoluteLinks |
    nsIDocumentEncoder::OutputNoScriptContent |
    nsIDocumentEncoder::OutputNoFramesContent,
    0);
} // ConvertFromHTMLToUnicode


NS_IMETHODIMP
nsHTMLFormatConverter::ConvertFromHTMLToAOLMail(const nsAutoString & aFromStr,
                                                nsAutoString & aToStr)
{
  aToStr.AssignLiteral("<HTML>");
  aToStr.Append(aFromStr);
  aToStr.AppendLiteral("</HTML>");

  return NS_OK;
}