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gecko-dev/intl/uconv/nsTextToSubURI.cpp

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10 KiB
C++
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/* -*- Mode: C++; tab-width: 4; 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 "nsString.h"
#include "nsIUnicodeEncoder.h"
#include "nsIUnicodeDecoder.h"
#include "nsITextToSubURI.h"
#include "nsEscape.h"
#include "nsTextToSubURI.h"
#include "nsCRT.h"
#include "mozilla/dom/EncodingUtils.h"
#include "mozilla/Preferences.h"
#include "nsISupportsPrimitives.h"
using mozilla::dom::EncodingUtils;
// Fallback value for the pref "network.IDN.blacklist_chars".
// UnEscapeURIForUI allows unescaped space; other than that, this is
// the same as the default "network.IDN.blacklist_chars" value.
static const char16_t sNetworkIDNBlacklistChars[] =
{
/*0x0020,*/
0x00A0, 0x00BC, 0x00BD, 0x00BE, 0x01C3, 0x02D0, 0x0337,
0x0338, 0x0589, 0x058A, 0x05C3, 0x05F4, 0x0609, 0x060A, 0x066A, 0x06D4,
0x0701, 0x0702, 0x0703, 0x0704, 0x115F, 0x1160, 0x1735, 0x2000,
0x2001, 0x2002, 0x2003, 0x2004, 0x2005, 0x2006, 0x2007, 0x2008,
0x2009, 0x200A, 0x200B, 0x200E, 0x200F, 0x2010, 0x2019, 0x2024, 0x2027, 0x2028,
0x2029, 0x202A, 0x202B, 0x202C, 0x202D, 0x202E, 0x202F, 0x2039,
0x203A, 0x2041, 0x2044, 0x2052, 0x205F, 0x2153, 0x2154, 0x2155,
0x2156, 0x2157, 0x2158, 0x2159, 0x215A, 0x215B, 0x215C, 0x215D,
0x215E, 0x215F, 0x2215, 0x2236, 0x23AE, 0x2571, 0x29F6, 0x29F8,
0x2AFB, 0x2AFD, 0x2FF0, 0x2FF1, 0x2FF2, 0x2FF3, 0x2FF4, 0x2FF5,
0x2FF6, 0x2FF7, 0x2FF8, 0x2FF9, 0x2FFA, 0x2FFB, /*0x3000,*/ 0x3002,
0x3014, 0x3015, 0x3033, 0x30A0, 0x3164, 0x321D, 0x321E, 0x33AE, 0x33AF,
0x33C6, 0x33DF, 0xA789, 0xFE14, 0xFE15, 0xFE3F, 0xFE5D, 0xFE5E,
0xFEFF, 0xFF0E, 0xFF0F, 0xFF61, 0xFFA0, 0xFFF9, 0xFFFA, 0xFFFB,
0xFFFC, 0xFFFD
};
nsTextToSubURI::~nsTextToSubURI()
{
}
NS_IMPL_ISUPPORTS(nsTextToSubURI, nsITextToSubURI)
NS_IMETHODIMP nsTextToSubURI::ConvertAndEscape(
const char *charset, const char16_t *text, char **_retval)
{
if (!_retval) {
return NS_ERROR_NULL_POINTER;
}
*_retval = nullptr;
nsresult rv = NS_OK;
if (!charset) {
return NS_ERROR_NULL_POINTER;
}
nsDependentCString label(charset);
nsAutoCString encoding;
if (!EncodingUtils::FindEncodingForLabelNoReplacement(label, encoding)) {
return NS_ERROR_UCONV_NOCONV;
}
nsCOMPtr<nsIUnicodeEncoder> encoder =
EncodingUtils::EncoderForEncoding(encoding);
rv = encoder->SetOutputErrorBehavior(nsIUnicodeEncoder::kOnError_Replace, nullptr, (char16_t)'?');
if (NS_SUCCEEDED(rv) ) {
char buf[256];
char *pBuf = buf;
int32_t ulen = text ? NS_strlen(text) : 0;
int32_t outlen = 0;
if (NS_SUCCEEDED(rv = encoder->GetMaxLength(text, ulen, &outlen))) {
if (outlen >= 256) {
pBuf = (char*)moz_xmalloc(outlen+1);
}
if (nullptr == pBuf) {
outlen = 255;
pBuf = buf;
}
int32_t bufLen = outlen;
if (NS_SUCCEEDED(rv = encoder->Convert(text,&ulen, pBuf, &outlen))) {
// put termination characters (e.g. ESC(B of ISO-2022-JP) if necessary
int32_t finLen = bufLen - outlen;
if (finLen > 0) {
if (NS_SUCCEEDED(encoder->Finish((char *)(pBuf+outlen), &finLen))) {
outlen += finLen;
}
}
*_retval = nsEscape(pBuf, outlen, nullptr, url_XPAlphas);
if (nullptr == *_retval) {
rv = NS_ERROR_OUT_OF_MEMORY;
}
}
}
if (pBuf != buf) {
free(pBuf);
}
}
return rv;
}
NS_IMETHODIMP nsTextToSubURI::UnEscapeAndConvert(
const char *charset, const char *text, char16_t **_retval)
{
if(nullptr == _retval)
return NS_ERROR_NULL_POINTER;
if(nullptr == text) {
// set empty string instead of returning error
// due to compatibility for old version
text = "";
}
*_retval = nullptr;
nsresult rv = NS_OK;
if (!charset) {
return NS_ERROR_NULL_POINTER;
}
// unescape the string, unescape changes the input
char *unescaped = NS_strdup(text);
if (nullptr == unescaped)
return NS_ERROR_OUT_OF_MEMORY;
unescaped = nsUnescape(unescaped);
NS_ASSERTION(unescaped, "nsUnescape returned null");
nsDependentCString label(charset);
nsAutoCString encoding;
if (!EncodingUtils::FindEncodingForLabelNoReplacement(label, encoding)) {
return NS_ERROR_UCONV_NOCONV;
}
nsCOMPtr<nsIUnicodeDecoder> decoder =
EncodingUtils::DecoderForEncoding(encoding);
char16_t *pBuf = nullptr;
int32_t len = strlen(unescaped);
int32_t outlen = 0;
if (NS_SUCCEEDED(rv = decoder->GetMaxLength(unescaped, len, &outlen))) {
pBuf = (char16_t *) moz_xmalloc((outlen+1)*sizeof(char16_t));
if (nullptr == pBuf) {
rv = NS_ERROR_OUT_OF_MEMORY;
} else {
if (NS_SUCCEEDED(rv = decoder->Convert(unescaped, &len, pBuf, &outlen))) {
pBuf[outlen] = 0;
*_retval = pBuf;
} else {
free(pBuf);
}
}
}
free(unescaped);
return rv;
}
static bool statefulCharset(const char *charset)
{
// HZ, UTF-7 and the CN and KR ISO-2022 variants are no longer in
// mozilla-central but keeping them here just in case for the benefit of
// comm-central.
if (!nsCRT::strncasecmp(charset, "ISO-2022-", sizeof("ISO-2022-")-1) ||
!nsCRT::strcasecmp(charset, "UTF-7") ||
!nsCRT::strcasecmp(charset, "HZ-GB-2312"))
return true;
return false;
}
nsresult nsTextToSubURI::convertURItoUnicode(const nsAFlatCString &aCharset,
const nsAFlatCString &aURI,
nsAString &_retval)
{
// check for 7bit encoding the data may not be ASCII after we decode
bool isStatefulCharset = statefulCharset(aCharset.get());
if (!isStatefulCharset) {
if (IsASCII(aURI)) {
CopyASCIItoUTF16(aURI, _retval);
return NS_OK;
}
if (IsUTF8(aURI)) {
CopyUTF8toUTF16(aURI, _retval);
return NS_OK;
}
}
// empty charset could indicate UTF-8, but aURI turns out not to be UTF-8.
NS_ENSURE_FALSE(aCharset.IsEmpty(), NS_ERROR_INVALID_ARG);
nsAutoCString encoding;
if (!EncodingUtils::FindEncodingForLabelNoReplacement(aCharset, encoding)) {
return NS_ERROR_UCONV_NOCONV;
}
nsCOMPtr<nsIUnicodeDecoder> unicodeDecoder =
EncodingUtils::DecoderForEncoding(encoding);
unicodeDecoder->SetInputErrorBehavior(nsIUnicodeDecoder::kOnError_Signal);
int32_t srcLen = aURI.Length();
int32_t dstLen;
nsresult rv = unicodeDecoder->GetMaxLength(aURI.get(), srcLen, &dstLen);
NS_ENSURE_SUCCESS(rv, rv);
char16_t *ustr = (char16_t *) moz_xmalloc(dstLen * sizeof(char16_t));
NS_ENSURE_TRUE(ustr, NS_ERROR_OUT_OF_MEMORY);
rv = unicodeDecoder->Convert(aURI.get(), &srcLen, ustr, &dstLen);
if (NS_SUCCEEDED(rv))
_retval.Assign(ustr, dstLen);
free(ustr);
return rv;
}
NS_IMETHODIMP nsTextToSubURI::UnEscapeURIForUI(const nsACString & aCharset,
const nsACString &aURIFragment,
nsAString &_retval)
{
nsAutoCString unescapedSpec;
// skip control octets (0x00 - 0x1f and 0x7f) when unescaping
NS_UnescapeURL(PromiseFlatCString(aURIFragment),
esc_SkipControl | esc_AlwaysCopy, unescapedSpec);
// in case of failure, return escaped URI
// Test for != NS_OK rather than NS_FAILED, because incomplete multi-byte
// sequences are also considered failure in this context
if (convertURItoUnicode(
PromiseFlatCString(aCharset), unescapedSpec, _retval)
!= NS_OK) {
// assume UTF-8 instead of ASCII because hostname (IDN) may be in UTF-8
CopyUTF8toUTF16(aURIFragment, _retval);
}
// If there are any characters that are unsafe for URIs, reescape those.
if (mUnsafeChars.IsEmpty()) {
nsAdoptingString blacklist;
nsresult rv = mozilla::Preferences::GetString("network.IDN.blacklist_chars",
&blacklist);
if (NS_SUCCEEDED(rv)) {
// we allow SPACE and IDEOGRAPHIC SPACE in this method
blacklist.StripChars(u" \u3000");
mUnsafeChars.AppendElements(static_cast<const char16_t*>(blacklist.Data()),
blacklist.Length());
} else {
NS_WARNING("Failed to get the 'network.IDN.blacklist_chars' preference");
}
// We check IsEmpty() intentionally here because an empty (or just spaces)
// pref value is likely a mistake/error of some sort.
if (mUnsafeChars.IsEmpty()) {
mUnsafeChars.AppendElements(sNetworkIDNBlacklistChars,
mozilla::ArrayLength(sNetworkIDNBlacklistChars));
}
mUnsafeChars.Sort();
}
const nsPromiseFlatString& unescapedResult = PromiseFlatString(_retval);
nsString reescapedSpec;
_retval = NS_EscapeURL(unescapedResult, mUnsafeChars, reescapedSpec);
return NS_OK;
}
NS_IMETHODIMP
nsTextToSubURI::UnEscapeNonAsciiURI(const nsACString& aCharset,
const nsACString& aURIFragment,
nsAString& _retval)
{
nsAutoCString unescapedSpec;
NS_UnescapeURL(PromiseFlatCString(aURIFragment),
esc_AlwaysCopy | esc_OnlyNonASCII, unescapedSpec);
// leave the URI as it is if it's not UTF-8 and aCharset is not a ASCII
// superset since converting "http:" with such an encoding is always a bad
// idea.
if (!IsUTF8(unescapedSpec) &&
(aCharset.LowerCaseEqualsLiteral("utf-16") ||
aCharset.LowerCaseEqualsLiteral("utf-16be") ||
aCharset.LowerCaseEqualsLiteral("utf-16le") ||
aCharset.LowerCaseEqualsLiteral("utf-7") ||
aCharset.LowerCaseEqualsLiteral("x-imap4-modified-utf7"))){
CopyASCIItoUTF16(aURIFragment, _retval);
return NS_OK;
}
nsresult rv = convertURItoUnicode(PromiseFlatCString(aCharset),
unescapedSpec, _retval);
// NS_OK_UDEC_MOREINPUT is a success code, so caller can't catch the error
// if the string ends with a valid (but incomplete) sequence.
return rv == NS_OK_UDEC_MOREINPUT ? NS_ERROR_UDEC_ILLEGALINPUT : rv;
}
//----------------------------------------------------------------------
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