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gecko-dev/netwerk/base/nsURLHelper.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=4 sw=2 sts=2 et cindent: */
/* 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 "mozilla/RangedPtr.h"
#include "mozilla/TextUtils.h"
#include <algorithm>
#include <iterator>
#include "nsASCIIMask.h"
#include "nsURLHelper.h"
#include "nsIFile.h"
#include "nsIURLParser.h"
#include "nsCOMPtr.h"
#include "nsCRT.h"
#include "nsNetCID.h"
#include "mozilla/Preferences.h"
#include "prnetdb.h"
#include "mozilla/Tokenizer.h"
#include "nsEscape.h"
#include "rust-helper/src/helper.h"
using namespace mozilla;
//----------------------------------------------------------------------------
// Init/Shutdown
//----------------------------------------------------------------------------
static bool gInitialized = false;
static nsIURLParser* gNoAuthURLParser = nullptr;
static nsIURLParser* gAuthURLParser = nullptr;
static nsIURLParser* gStdURLParser = nullptr;
static int32_t gMaxLength = 1048576; // Default: 1MB
static void InitGlobals() {
nsCOMPtr<nsIURLParser> parser;
parser = do_GetService(NS_NOAUTHURLPARSER_CONTRACTID);
NS_ASSERTION(parser, "failed getting 'noauth' url parser");
if (parser) {
gNoAuthURLParser = parser.get();
NS_ADDREF(gNoAuthURLParser);
}
parser = do_GetService(NS_AUTHURLPARSER_CONTRACTID);
NS_ASSERTION(parser, "failed getting 'auth' url parser");
if (parser) {
gAuthURLParser = parser.get();
NS_ADDREF(gAuthURLParser);
}
parser = do_GetService(NS_STDURLPARSER_CONTRACTID);
NS_ASSERTION(parser, "failed getting 'std' url parser");
if (parser) {
gStdURLParser = parser.get();
NS_ADDREF(gStdURLParser);
}
gInitialized = true;
Preferences::AddIntVarCache(&gMaxLength, "network.standard-url.max-length",
1048576);
}
void net_ShutdownURLHelper() {
if (gInitialized) {
NS_IF_RELEASE(gNoAuthURLParser);
NS_IF_RELEASE(gAuthURLParser);
NS_IF_RELEASE(gStdURLParser);
gInitialized = false;
}
}
int32_t net_GetURLMaxLength() { return gMaxLength; }
//----------------------------------------------------------------------------
// nsIURLParser getters
//----------------------------------------------------------------------------
nsIURLParser* net_GetAuthURLParser() {
if (!gInitialized) InitGlobals();
return gAuthURLParser;
}
nsIURLParser* net_GetNoAuthURLParser() {
if (!gInitialized) InitGlobals();
return gNoAuthURLParser;
}
nsIURLParser* net_GetStdURLParser() {
if (!gInitialized) InitGlobals();
return gStdURLParser;
}
//---------------------------------------------------------------------------
// GetFileFromURLSpec implementations
//---------------------------------------------------------------------------
nsresult net_GetURLSpecFromDir(nsIFile* aFile, nsACString& result) {
nsAutoCString escPath;
nsresult rv = net_GetURLSpecFromActualFile(aFile, escPath);
if (NS_FAILED(rv)) return rv;
if (escPath.Last() != '/') {
escPath += '/';
}
result = escPath;
return NS_OK;
}
nsresult net_GetURLSpecFromFile(nsIFile* aFile, nsACString& result) {
nsAutoCString escPath;
nsresult rv = net_GetURLSpecFromActualFile(aFile, escPath);
if (NS_FAILED(rv)) return rv;
// if this file references a directory, then we need to ensure that the
// URL ends with a slash. this is important since it affects the rules
// for relative URL resolution when this URL is used as a base URL.
// if the file does not exist, then we make no assumption about its type,
// and simply leave the URL unmodified.
if (escPath.Last() != '/') {
bool dir;
rv = aFile->IsDirectory(&dir);
if (NS_SUCCEEDED(rv) && dir) escPath += '/';
}
result = escPath;
return NS_OK;
}
//----------------------------------------------------------------------------
// file:// URL parsing
//----------------------------------------------------------------------------
nsresult net_ParseFileURL(const nsACString& inURL, nsACString& outDirectory,
nsACString& outFileBaseName,
nsACString& outFileExtension) {
nsresult rv;
if (inURL.Length() > (uint32_t)gMaxLength) {
return NS_ERROR_MALFORMED_URI;
}
outDirectory.Truncate();
outFileBaseName.Truncate();
outFileExtension.Truncate();
const nsPromiseFlatCString& flatURL = PromiseFlatCString(inURL);
const char* url = flatURL.get();
nsAutoCString scheme;
rv = net_ExtractURLScheme(flatURL, scheme);
if (NS_FAILED(rv)) return rv;
if (!scheme.EqualsLiteral("file")) {
NS_ERROR("must be a file:// url");
return NS_ERROR_UNEXPECTED;
}
nsIURLParser* parser = net_GetNoAuthURLParser();
NS_ENSURE_TRUE(parser, NS_ERROR_UNEXPECTED);
uint32_t pathPos, filepathPos, directoryPos, basenamePos, extensionPos;
int32_t pathLen, filepathLen, directoryLen, basenameLen, extensionLen;
// invoke the parser to extract the URL path
rv = parser->ParseURL(url, flatURL.Length(), nullptr,
nullptr, // don't care about scheme
nullptr, nullptr, // don't care about authority
&pathPos, &pathLen);
if (NS_FAILED(rv)) return rv;
// invoke the parser to extract filepath from the path
rv = parser->ParsePath(url + pathPos, pathLen, &filepathPos, &filepathLen,
nullptr, nullptr, // don't care about query
nullptr, nullptr); // don't care about ref
if (NS_FAILED(rv)) return rv;
filepathPos += pathPos;
// invoke the parser to extract the directory and filename from filepath
rv = parser->ParseFilePath(url + filepathPos, filepathLen, &directoryPos,
&directoryLen, &basenamePos, &basenameLen,
&extensionPos, &extensionLen);
if (NS_FAILED(rv)) return rv;
if (directoryLen > 0)
outDirectory = Substring(inURL, filepathPos + directoryPos, directoryLen);
if (basenameLen > 0)
outFileBaseName = Substring(inURL, filepathPos + basenamePos, basenameLen);
if (extensionLen > 0)
outFileExtension =
Substring(inURL, filepathPos + extensionPos, extensionLen);
// since we are using a no-auth url parser, there will never be a host
// XXX not strictly true... file://localhost/foo/bar.html is a valid URL
return NS_OK;
}
//----------------------------------------------------------------------------
// path manipulation functions
//----------------------------------------------------------------------------
// Replace all /./ with a / while resolving URLs
// But only till #?
void net_CoalesceDirs(netCoalesceFlags flags, char* path) {
/* Stolen from the old netlib's mkparse.c.
*
* modifies a url of the form /foo/../foo1 -> /foo1
* and /foo/./foo1 -> /foo/foo1
* and /foo/foo1/.. -> /foo/
*/
char* fwdPtr = path;
char* urlPtr = path;
char* lastslash = path;
uint32_t traversal = 0;
uint32_t special_ftp_len = 0;
/* Remember if this url is a special ftp one: */
if (flags & NET_COALESCE_DOUBLE_SLASH_IS_ROOT) {
/* some schemes (for example ftp) have the speciality that
the path can begin // or /%2F to mark the root of the
servers filesystem, a simple / only marks the root relative
to the user loging in. We remember the length of the marker */
if (nsCRT::strncasecmp(path, "/%2F", 4) == 0)
special_ftp_len = 4;
else if (strncmp(path, "//", 2) == 0)
special_ftp_len = 2;
}
/* find the last slash before # or ? */
for (; (*fwdPtr != '\0') && (*fwdPtr != '?') && (*fwdPtr != '#'); ++fwdPtr) {
}
/* found nothing, but go back one only */
/* if there is something to go back to */
if (fwdPtr != path && *fwdPtr == '\0') {
--fwdPtr;
}
/* search the slash */
for (; (fwdPtr != path) && (*fwdPtr != '/'); --fwdPtr) {
}
lastslash = fwdPtr;
fwdPtr = path;
/* replace all %2E or %2e with . in the path */
/* but stop at lastchar if non null */
for (; (*fwdPtr != '\0') && (*fwdPtr != '?') && (*fwdPtr != '#') &&
(*lastslash == '\0' || fwdPtr != lastslash);
++fwdPtr) {
if (*fwdPtr == '%' && *(fwdPtr + 1) == '2' &&
(*(fwdPtr + 2) == 'E' || *(fwdPtr + 2) == 'e')) {
*urlPtr++ = '.';
++fwdPtr;
++fwdPtr;
} else {
*urlPtr++ = *fwdPtr;
}
}
// Copy remaining stuff past the #?;
for (; *fwdPtr != '\0'; ++fwdPtr) {
*urlPtr++ = *fwdPtr;
}
*urlPtr = '\0'; // terminate the url
// start again, this time for real
fwdPtr = path;
urlPtr = path;
for (; (*fwdPtr != '\0') && (*fwdPtr != '?') && (*fwdPtr != '#'); ++fwdPtr) {
if (*fwdPtr == '/' && *(fwdPtr + 1) == '.' && *(fwdPtr + 2) == '/') {
// remove . followed by slash
++fwdPtr;
} else if (*fwdPtr == '/' && *(fwdPtr + 1) == '.' && *(fwdPtr + 2) == '.' &&
(*(fwdPtr + 3) == '/' ||
*(fwdPtr + 3) == '\0' || // This will take care of
*(fwdPtr + 3) == '?' || // something like foo/bar/..#sometag
*(fwdPtr + 3) == '#')) {
// remove foo/..
// reverse the urlPtr to the previous slash if possible
// if url does not allow relative root then drop .. above root
// otherwise retain them in the path
if (traversal > 0 || !(flags & NET_COALESCE_ALLOW_RELATIVE_ROOT)) {
if (urlPtr != path) urlPtr--; // we must be going back at least by one
for (; *urlPtr != '/' && urlPtr != path; urlPtr--)
; // null body
--traversal; // count back
// forward the fwdPtr past the ../
fwdPtr += 2;
// if we have reached the beginning of the path
// while searching for the previous / and we remember
// that it is an url that begins with /%2F then
// advance urlPtr again by 3 chars because /%2F already
// marks the root of the path
if (urlPtr == path && special_ftp_len > 3) {
++urlPtr;
++urlPtr;
++urlPtr;
}
// special case if we have reached the end
// to preserve the last /
if (*fwdPtr == '.' && *(fwdPtr + 1) == '\0') ++urlPtr;
} else {
// there are to much /.. in this path, just copy them instead.
// forward the urlPtr past the /.. and copying it
// However if we remember it is an url that starts with
// /%2F and urlPtr just points at the "F" of "/%2F" then do
// not overwrite it with the /, just copy .. and move forward
// urlPtr.
if (special_ftp_len > 3 && urlPtr == path + special_ftp_len - 1)
++urlPtr;
else
*urlPtr++ = *fwdPtr;
++fwdPtr;
*urlPtr++ = *fwdPtr;
++fwdPtr;
*urlPtr++ = *fwdPtr;
}
} else {
// count the hierachie, but only if we do not have reached
// the root of some special urls with a special root marker
if (*fwdPtr == '/' && *(fwdPtr + 1) != '.' &&
(special_ftp_len != 2 || *(fwdPtr + 1) != '/'))
traversal++;
// copy the url incrementaly
*urlPtr++ = *fwdPtr;
}
}
/*
* Now lets remove trailing . case
* /foo/foo1/. -> /foo/foo1/
*/
if ((urlPtr > (path + 1)) && (*(urlPtr - 1) == '.') && (*(urlPtr - 2) == '/'))
urlPtr--;
// Copy remaining stuff past the #?;
for (; *fwdPtr != '\0'; ++fwdPtr) {
*urlPtr++ = *fwdPtr;
}
*urlPtr = '\0'; // terminate the url
}
nsresult net_ResolveRelativePath(const nsACString& relativePath,
const nsACString& basePath,
nsACString& result) {
nsAutoCString name;
nsAutoCString path(basePath);
bool needsDelim = false;
if (!path.IsEmpty()) {
char16_t last = path.Last();
needsDelim = !(last == '/');
}
nsACString::const_iterator beg, end;
relativePath.BeginReading(beg);
relativePath.EndReading(end);
bool stop = false;
char c;
for (; !stop; ++beg) {
c = (beg == end) ? '\0' : *beg;
// printf("%c [name=%s] [path=%s]\n", c, name.get(), path.get());
switch (c) {
case '\0':
case '#':
case '?':
stop = true;
MOZ_FALLTHROUGH;
case '/':
// delimiter found
if (name.EqualsLiteral("..")) {
// pop path
// If we already have the delim at end, then
// skip over that when searching for next one to the left
int32_t offset = path.Length() - (needsDelim ? 1 : 2);
// First check for errors
if (offset < 0) return NS_ERROR_MALFORMED_URI;
int32_t pos = path.RFind("/", false, offset);
if (pos >= 0)
path.Truncate(pos + 1);
else
path.Truncate();
} else if (name.IsEmpty() || name.EqualsLiteral(".")) {
// do nothing
} else {
// append name to path
if (needsDelim) path += '/';
path += name;
needsDelim = true;
}
name.Truncate();
break;
default:
// append char to name
name += c;
}
}
// append anything left on relativePath (e.g. #..., ;..., ?...)
if (c != '\0') path += Substring(--beg, end);
result = path;
return NS_OK;
}
//----------------------------------------------------------------------------
// scheme fu
//----------------------------------------------------------------------------
static bool net_IsValidSchemeChar(const char aChar) {
if (IsAsciiAlpha(aChar) || IsAsciiDigit(aChar) || aChar == '+' ||
aChar == '.' || aChar == '-') {
return true;
}
return false;
}
/* Extract URI-Scheme if possible */
nsresult net_ExtractURLScheme(const nsACString& inURI, nsACString& scheme) {
nsACString::const_iterator start, end;
inURI.BeginReading(start);
inURI.EndReading(end);
// Strip C0 and space from begining
while (start != end) {
if ((uint8_t)*start > 0x20) {
break;
}
start++;
}
Tokenizer p(Substring(start, end), "\r\n\t");
p.Record();
if (!p.CheckChar(IsAsciiAlpha)) {
// First char must be alpha
return NS_ERROR_MALFORMED_URI;
}
while (p.CheckChar(net_IsValidSchemeChar) || p.CheckWhite()) {
// Skip valid scheme characters or \r\n\t
}
if (!p.CheckChar(':')) {
return NS_ERROR_MALFORMED_URI;
}
p.Claim(scheme);
scheme.StripTaggedASCII(ASCIIMask::MaskCRLFTab());
ToLowerCase(scheme);
return NS_OK;
}
bool net_IsValidScheme(const char* scheme, uint32_t schemeLen) {
// first char must be alpha
if (!IsAsciiAlpha(*scheme)) return false;
// nsCStrings may have embedded nulls -- reject those too
for (; schemeLen; ++scheme, --schemeLen) {
if (!(IsAsciiAlpha(*scheme) || IsAsciiDigit(*scheme) || *scheme == '+' ||
*scheme == '.' || *scheme == '-'))
return false;
}
return true;
}
bool net_IsAbsoluteURL(const nsACString& uri) {
nsACString::const_iterator start, end;
uri.BeginReading(start);
uri.EndReading(end);
// Strip C0 and space from begining
while (start != end) {
if ((uint8_t)*start > 0x20) {
break;
}
start++;
}
Tokenizer p(Substring(start, end), "\r\n\t");
// First char must be alpha
if (!p.CheckChar(IsAsciiAlpha)) {
return false;
}
while (p.CheckChar(net_IsValidSchemeChar) || p.CheckWhite()) {
// Skip valid scheme characters or \r\n\t
}
if (!p.CheckChar(':')) {
return false;
}
p.SkipWhites();
if (!p.CheckChar('/')) {
return false;
}
p.SkipWhites();
if (p.CheckChar('/')) {
// aSpec is really absolute. Ignore aBaseURI in this case
return true;
}
return false;
}
void net_FilterURIString(const nsACString& input, nsACString& result) {
result.Truncate();
auto start = input.BeginReading();
auto end = input.EndReading();
// Trim off leading and trailing invalid chars.
auto charFilter = [](char c) { return static_cast<uint8_t>(c) > 0x20; };
auto newStart = std::find_if(start, end, charFilter);
auto newEnd =
std::find_if(std::reverse_iterator<decltype(end)>(end),
std::reverse_iterator<decltype(newStart)>(newStart),
charFilter)
.base();
// Check if chars need to be stripped.
bool needsStrip = false;
const ASCIIMaskArray& mask = ASCIIMask::MaskCRLFTab();
for (auto itr = start; itr != end; ++itr) {
if (ASCIIMask::IsMasked(mask, *itr)) {
needsStrip = true;
break;
}
}
// Just use the passed in string rather than creating new copies if no
// changes are necessary.
if (newStart == start && newEnd == end && !needsStrip) {
result = input;
return;
}
result.Assign(Substring(newStart, newEnd));
if (needsStrip) {
result.StripTaggedASCII(mask);
}
}
nsresult net_FilterAndEscapeURI(const nsACString& aInput, uint32_t aFlags,
nsACString& aResult) {
aResult.Truncate();
auto start = aInput.BeginReading();
auto end = aInput.EndReading();
// Trim off leading and trailing invalid chars.
auto charFilter = [](char c) { return static_cast<uint8_t>(c) > 0x20; };
auto newStart = std::find_if(start, end, charFilter);
auto newEnd =
std::find_if(std::reverse_iterator<decltype(end)>(end),
std::reverse_iterator<decltype(newStart)>(newStart),
charFilter)
.base();
const ASCIIMaskArray& mask = ASCIIMask::MaskCRLFTab();
return NS_EscapeAndFilterURL(Substring(newStart, newEnd), aFlags, &mask,
aResult, fallible);
}
#if defined(XP_WIN)
bool net_NormalizeFileURL(const nsACString& aURL, nsCString& aResultBuf) {
bool writing = false;
nsACString::const_iterator beginIter, endIter;
aURL.BeginReading(beginIter);
aURL.EndReading(endIter);
const char *s, *begin = beginIter.get();
for (s = begin; s != endIter.get(); ++s) {
if (*s == '\\') {
writing = true;
if (s > begin) aResultBuf.Append(begin, s - begin);
aResultBuf += '/';
begin = s + 1;
}
}
if (writing && s > begin) aResultBuf.Append(begin, s - begin);
return writing;
}
#endif
//----------------------------------------------------------------------------
// miscellaneous (i.e., stuff that should really be elsewhere)
//----------------------------------------------------------------------------
static inline void ToLower(char& c) {
if ((unsigned)(c - 'A') <= (unsigned)('Z' - 'A')) c += 'a' - 'A';
}
void net_ToLowerCase(char* str, uint32_t length) {
for (char* end = str + length; str < end; ++str) ToLower(*str);
}
void net_ToLowerCase(char* str) {
for (; *str; ++str) ToLower(*str);
}
char* net_FindCharInSet(const char* iter, const char* stop, const char* set) {
for (; iter != stop && *iter; ++iter) {
for (const char* s = set; *s; ++s) {
if (*iter == *s) return (char*)iter;
}
}
return (char*)iter;
}
char* net_FindCharNotInSet(const char* iter, const char* stop,
const char* set) {
repeat:
for (const char* s = set; *s; ++s) {
if (*iter == *s) {
if (++iter == stop) break;
goto repeat;
}
}
return (char*)iter;
}
char* net_RFindCharNotInSet(const char* stop, const char* iter,
const char* set) {
--iter;
--stop;
if (iter == stop) return (char*)iter;
repeat:
for (const char* s = set; *s; ++s) {
if (*iter == *s) {
if (--iter == stop) break;
goto repeat;
}
}
return (char*)iter;
}
#define HTTP_LWS " \t"
// Return the index of the closing quote of the string, if any
static uint32_t net_FindStringEnd(const nsCString& flatStr,
uint32_t stringStart, char stringDelim) {
NS_ASSERTION(stringStart < flatStr.Length() &&
flatStr.CharAt(stringStart) == stringDelim &&
(stringDelim == '"' || stringDelim == '\''),
"Invalid stringStart");
const char set[] = {stringDelim, '\\', '\0'};
do {
// stringStart points to either the start quote or the last
// escaped char (the char following a '\\')
// Write to searchStart here, so that when we get back to the
// top of the loop right outside this one we search from the
// right place.
uint32_t stringEnd = flatStr.FindCharInSet(set, stringStart + 1);
if (stringEnd == uint32_t(kNotFound)) return flatStr.Length();
if (flatStr.CharAt(stringEnd) == '\\') {
// Hit a backslash-escaped char. Need to skip over it.
stringStart = stringEnd + 1;
if (stringStart == flatStr.Length()) return stringStart;
// Go back to looking for the next escape or the string end
continue;
}
return stringEnd;
} while (true);
MOZ_ASSERT_UNREACHABLE("How did we get here?");
return flatStr.Length();
}
static uint32_t net_FindMediaDelimiter(const nsCString& flatStr,
uint32_t searchStart, char delimiter) {
do {
// searchStart points to the spot from which we should start looking
// for the delimiter.
const char delimStr[] = {delimiter, '"', '\0'};
uint32_t curDelimPos = flatStr.FindCharInSet(delimStr, searchStart);
if (curDelimPos == uint32_t(kNotFound)) return flatStr.Length();
char ch = flatStr.CharAt(curDelimPos);
if (ch == delimiter) {
// Found delimiter
return curDelimPos;
}
// We hit the start of a quoted string. Look for its end.
searchStart = net_FindStringEnd(flatStr, curDelimPos, ch);
if (searchStart == flatStr.Length()) return searchStart;
++searchStart;
// searchStart now points to the first char after the end of the
// string, so just go back to the top of the loop and look for
// |delimiter| again.
} while (true);
MOZ_ASSERT_UNREACHABLE("How did we get here?");
return flatStr.Length();
}
// aOffset should be added to aCharsetStart and aCharsetEnd if this
// function sets them.
static void net_ParseMediaType(const nsACString& aMediaTypeStr,
nsACString& aContentType,
nsACString& aContentCharset, int32_t aOffset,
bool* aHadCharset, int32_t* aCharsetStart,
int32_t* aCharsetEnd, bool aStrict) {
const nsCString& flatStr = PromiseFlatCString(aMediaTypeStr);
const char* start = flatStr.get();
const char* end = start + flatStr.Length();
// Trim LWS leading and trailing whitespace from type. We include '(' in
// the trailing trim set to catch media-type comments, which are not at all
// standard, but may occur in rare cases.
const char* type = net_FindCharNotInSet(start, end, HTTP_LWS);
const char* typeEnd = net_FindCharInSet(type, end, HTTP_LWS ";(");
const char* charset = "";
const char* charsetEnd = charset;
int32_t charsetParamStart = 0;
int32_t charsetParamEnd = 0;
uint32_t consumed = typeEnd - type;
// Iterate over parameters
bool typeHasCharset = false;
uint32_t paramStart = flatStr.FindChar(';', typeEnd - start);
if (paramStart != uint32_t(kNotFound)) {
// We have parameters. Iterate over them.
uint32_t curParamStart = paramStart + 1;
do {
uint32_t curParamEnd =
net_FindMediaDelimiter(flatStr, curParamStart, ';');
const char* paramName = net_FindCharNotInSet(
start + curParamStart, start + curParamEnd, HTTP_LWS);
static const char charsetStr[] = "charset=";
if (PL_strncasecmp(paramName, charsetStr, sizeof(charsetStr) - 1) == 0) {
charset = paramName + sizeof(charsetStr) - 1;
charsetEnd = start + curParamEnd;
typeHasCharset = true;
charsetParamStart = curParamStart - 1;
charsetParamEnd = curParamEnd;
}
consumed = curParamEnd;
curParamStart = curParamEnd + 1;
} while (curParamStart < flatStr.Length());
}
bool charsetNeedsQuotedStringUnescaping = false;
if (typeHasCharset) {
// Trim LWS leading and trailing whitespace from charset. We include
// '(' in the trailing trim set to catch media-type comments, which are
// not at all standard, but may occur in rare cases.
charset = net_FindCharNotInSet(charset, charsetEnd, HTTP_LWS);
if (*charset == '"') {
charsetNeedsQuotedStringUnescaping = true;
charsetEnd =
start + net_FindStringEnd(flatStr, charset - start, *charset);
charset++;
NS_ASSERTION(charsetEnd >= charset, "Bad charset parsing");
} else {
charsetEnd = net_FindCharInSet(charset, charsetEnd, HTTP_LWS ";(");
}
}
// if the server sent "*/*", it is meaningless, so do not store it.
// also, if type is the same as aContentType, then just update the
// charset. however, if charset is empty and aContentType hasn't
// changed, then don't wipe-out an existing aContentCharset. We
// also want to reject a mime-type if it does not include a slash.
// some servers give junk after the charset parameter, which may
// include a comma, so this check makes us a bit more tolerant.
if (type != typeEnd && memchr(type, '/', typeEnd - type) != nullptr &&
(aStrict ? (net_FindCharNotInSet(start + consumed, end, HTTP_LWS) == end)
: (strncmp(type, "*/*", typeEnd - type) != 0))) {
// Common case here is that aContentType is empty
bool eq = !aContentType.IsEmpty() &&
aContentType.Equals(Substring(type, typeEnd),
nsCaseInsensitiveCStringComparator());
if (!eq) {
aContentType.Assign(type, typeEnd - type);
ToLowerCase(aContentType);
}
if ((!eq && *aHadCharset) || typeHasCharset) {
*aHadCharset = true;
if (charsetNeedsQuotedStringUnescaping) {
// parameters using the "quoted-string" syntax need
// backslash-escapes to be unescaped (see RFC 2616 Section 2.2)
aContentCharset.Truncate();
for (const char* c = charset; c != charsetEnd; c++) {
if (*c == '\\' && c + 1 != charsetEnd) {
// eat escape
c++;
}
aContentCharset.Append(*c);
}
} else {
aContentCharset.Assign(charset, charsetEnd - charset);
}
if (typeHasCharset) {
*aCharsetStart = charsetParamStart + aOffset;
*aCharsetEnd = charsetParamEnd + aOffset;
}
}
// Only set a new charset position if this is a different type
// from the last one we had and it doesn't already have a
// charset param. If this is the same type, we probably want
// to leave the charset position on its first occurrence.
if (!eq && !typeHasCharset) {
int32_t charsetStart = int32_t(paramStart);
if (charsetStart == kNotFound) charsetStart = flatStr.Length();
*aCharsetEnd = *aCharsetStart = charsetStart + aOffset;
}
}
}
#undef HTTP_LWS
void net_ParseContentType(const nsACString& aHeaderStr,
nsACString& aContentType, nsACString& aContentCharset,
bool* aHadCharset) {
int32_t dummy1, dummy2;
net_ParseContentType(aHeaderStr, aContentType, aContentCharset, aHadCharset,
&dummy1, &dummy2);
}
void net_ParseContentType(const nsACString& aHeaderStr,
nsACString& aContentType, nsACString& aContentCharset,
bool* aHadCharset, int32_t* aCharsetStart,
int32_t* aCharsetEnd) {
//
// Augmented BNF (from RFC 2616 section 3.7):
//
// header-value = media-type *( LWS "," LWS media-type )
// media-type = type "/" subtype *( LWS ";" LWS parameter )
// type = token
// subtype = token
// parameter = attribute "=" value
// attribute = token
// value = token | quoted-string
//
//
// Examples:
//
// text/html
// text/html, text/html
// text/html,text/html; charset=ISO-8859-1
// text/html,text/html; charset="ISO-8859-1"
// text/html;charset=ISO-8859-1, text/html
// text/html;charset='ISO-8859-1', text/html
// application/octet-stream
//
*aHadCharset = false;
const nsCString& flatStr = PromiseFlatCString(aHeaderStr);
// iterate over media-types. Note that ',' characters can happen
// inside quoted strings, so we need to watch out for that.
uint32_t curTypeStart = 0;
do {
// curTypeStart points to the start of the current media-type. We want
// to look for its end.
uint32_t curTypeEnd = net_FindMediaDelimiter(flatStr, curTypeStart, ',');
// At this point curTypeEnd points to the spot where the media-type
// starting at curTypeEnd ends. Time to parse that!
net_ParseMediaType(
Substring(flatStr, curTypeStart, curTypeEnd - curTypeStart),
aContentType, aContentCharset, curTypeStart, aHadCharset, aCharsetStart,
aCharsetEnd, false);
// And let's move on to the next media-type
curTypeStart = curTypeEnd + 1;
} while (curTypeStart < flatStr.Length());
}
void net_ParseRequestContentType(const nsACString& aHeaderStr,
nsACString& aContentType,
nsACString& aContentCharset,
bool* aHadCharset) {
//
// Augmented BNF (from RFC 7231 section 3.1.1.1):
//
// media-type = type "/" subtype *( OWS ";" OWS parameter )
// type = token
// subtype = token
// parameter = token "=" ( token / quoted-string )
//
// Examples:
//
// text/html
// text/html; charset=ISO-8859-1
// text/html; charset="ISO-8859-1"
// application/octet-stream
//
aContentType.Truncate();
aContentCharset.Truncate();
*aHadCharset = false;
const nsCString& flatStr = PromiseFlatCString(aHeaderStr);
// At this point curTypeEnd points to the spot where the media-type
// starting at curTypeEnd ends. Time to parse that!
nsAutoCString contentType, contentCharset;
bool hadCharset = false;
int32_t dummy1, dummy2;
uint32_t typeEnd = net_FindMediaDelimiter(flatStr, 0, ',');
if (typeEnd != flatStr.Length()) {
// We have some stuff left at the end, so this is not a valid
// request Content-Type header.
return;
}
net_ParseMediaType(flatStr, contentType, contentCharset, 0, &hadCharset,
&dummy1, &dummy2, true);
aContentType = contentType;
aContentCharset = contentCharset;
*aHadCharset = hadCharset;
}
bool net_IsValidHostName(const nsACString& host) {
const char* end = host.EndReading();
// Use explicit whitelists to select which characters we are
// willing to send to lower-level DNS logic. This is more
// self-documenting, and can also be slightly faster than the
// blacklist approach, since DNS names are the common case, and
// the commonest characters will tend to be near the start of
// the list.
// Whitelist for DNS names (RFC 1035) with extra characters added
// for pragmatic reasons "$+_"
// see https://bugzilla.mozilla.org/show_bug.cgi?id=355181#c2
if (net_FindCharNotInSet(host.BeginReading(), end,
"abcdefghijklmnopqrstuvwxyz"
".-0123456789"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ$+_") == end)
return true;
// Might be a valid IPv6 link-local address containing a percent sign
nsAutoCString strhost(host);
PRNetAddr addr;
return PR_StringToNetAddr(strhost.get(), &addr) == PR_SUCCESS;
}
bool net_IsValidIPv4Addr(const nsACString& aAddr) {
return rust_net_is_valid_ipv4_addr(aAddr);
}
bool net_IsValidIPv6Addr(const nsACString& aAddr) {
return rust_net_is_valid_ipv6_addr(aAddr);
}
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