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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/filename_util.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/path_service.h"
#include "base/strings/string_util.h"
#include "base/strings/sys_string_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "base/threading/thread_restrictions.h"
#include "net/base/escape.h"
#include "net/base/filename_util_internal.h"
#include "net/base/mime_util.h"
#include "net/base/net_string_util.h"
#include "net/http/http_content_disposition.h"
#include "url/gurl.h"
namespace net {
// Prefix to prepend to get a file URL.
static const base::FilePath::CharType kFileURLPrefix[] =
FILE_PATH_LITERAL("file:///");
GURL FilePathToFileURL(const base::FilePath& path) {
// Produce a URL like "file:///C:/foo" for a regular file, or
// "file://///server/path" for UNC. The URL canonicalizer will fix up the
// latter case to be the canonical UNC form: "file://server/path"
base::FilePath::StringType url_string(kFileURLPrefix);
if (!path.IsAbsolute()) {
base::FilePath current_dir;
PathService::Get(base::DIR_CURRENT, ¤t_dir);
url_string.append(current_dir.value());
url_string.push_back(base::FilePath::kSeparators[0]);
}
url_string.append(path.value());
// Now do replacement of some characters. Since we assume the input is a
// literal filename, anything the URL parser might consider special should
// be escaped here.
// must be the first substitution since others will introduce percents as the
// escape character
ReplaceSubstringsAfterOffset(
&url_string, 0, FILE_PATH_LITERAL("%"), FILE_PATH_LITERAL("%25"));
// semicolon is supposed to be some kind of separator according to RFC 2396
ReplaceSubstringsAfterOffset(
&url_string, 0, FILE_PATH_LITERAL(";"), FILE_PATH_LITERAL("%3B"));
ReplaceSubstringsAfterOffset(
&url_string, 0, FILE_PATH_LITERAL("#"), FILE_PATH_LITERAL("%23"));
ReplaceSubstringsAfterOffset(
&url_string, 0, FILE_PATH_LITERAL("?"), FILE_PATH_LITERAL("%3F"));
#if defined(OS_POSIX)
ReplaceSubstringsAfterOffset(
&url_string, 0, FILE_PATH_LITERAL("\\"), FILE_PATH_LITERAL("%5C"));
#endif
return GURL(url_string);
}
bool FileURLToFilePath(const GURL& url, base::FilePath* file_path) {
*file_path = base::FilePath();
base::FilePath::StringType& file_path_str =
const_cast<base::FilePath::StringType&>(file_path->value());
file_path_str.clear();
if (!url.is_valid())
return false;
#if defined(OS_WIN)
std::string path;
std::string host = url.host();
if (host.empty()) {
// URL contains no host, the path is the filename. In this case, the path
// will probably be preceeded with a slash, as in "/C:/foo.txt", so we
// trim out that here.
path = url.path();
size_t first_non_slash = path.find_first_not_of("/\\");
if (first_non_slash != std::string::npos && first_non_slash > 0)
path.erase(0, first_non_slash);
} else {
// URL contains a host: this means it's UNC. We keep the preceeding slash
// on the path.
path = "\\\\";
path.append(host);
path.append(url.path());
}
std::replace(path.begin(), path.end(), '/', '\\');
#else // defined(OS_WIN)
// Firefox seems to ignore the "host" of a file url if there is one. That is,
// file://foo/bar.txt maps to /bar.txt.
// TODO(dhg): This should probably take into account UNCs which could
// include a hostname other than localhost or blank
std::string path = url.path();
#endif // !defined(OS_WIN)
if (path.empty())
return false;
// GURL stores strings as percent-encoded 8-bit, this will undo if possible.
path = UnescapeURLComponent(
path, UnescapeRule::SPACES | UnescapeRule::URL_SPECIAL_CHARS);
#if defined(OS_WIN)
if (base::IsStringUTF8(path)) {
file_path_str.assign(base::UTF8ToWide(path));
// We used to try too hard and see if |path| made up entirely of
// the 1st 256 characters in the Unicode was a zero-extended UTF-16.
// If so, we converted it to 'Latin-1' and checked if the result was UTF-8.
// If the check passed, we converted the result to UTF-8.
// Otherwise, we treated the result as the native OS encoding.
// However, that led to http://crbug.com/4619 and http://crbug.com/14153
} else {
// Not UTF-8, assume encoding is native codepage and we're done. We know we
// are giving the conversion function a nonempty string, and it may fail if
// the given string is not in the current encoding and give us an empty
// string back. We detect this and report failure.
file_path_str = base::SysNativeMBToWide(path);
}
#else // defined(OS_WIN)
// Collapse multiple path slashes into a single path slash.
std::string new_path;
do {
new_path = path;
ReplaceSubstringsAfterOffset(&new_path, 0, "//", "/");
path.swap(new_path);
} while (new_path != path);
file_path_str.assign(path);
#endif // !defined(OS_WIN)
return !file_path_str.empty();
}
void GenerateSafeFileName(const std::string& mime_type,
bool ignore_extension,
base::FilePath* file_path) {
// Make sure we get the right file extension
EnsureSafeExtension(mime_type, ignore_extension, file_path);
#if defined(OS_WIN)
// Prepend "_" to the file name if it's a reserved name
base::FilePath::StringType leaf_name = file_path->BaseName().value();
DCHECK(!leaf_name.empty());
if (IsReservedName(leaf_name)) {
leaf_name = base::FilePath::StringType(FILE_PATH_LITERAL("_")) + leaf_name;
*file_path = file_path->DirName();
if (file_path->value() == base::FilePath::kCurrentDirectory) {
*file_path = base::FilePath(leaf_name);
} else {
*file_path = file_path->Append(leaf_name);
}
}
#endif
}
} // namespace net
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