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// Copyright (c) 2009 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 "chrome/browser/privacy_blacklist/blacklist_io.h"
#include <algorithm>
#include <string>
#include "base/file_path.h"
#include "base/file_util.h"
#include "base/string_util.h"
#include "base/string_tokenizer.h"
#include "chrome/browser/privacy_blacklist/blacklist_store.h"
namespace {
const char header[] = "[Chromium::PrivacyBlacklist]";
const char name_tag[] = "Name:";
const char url_tag[] = "URL:";
const char arrow_tag[] = "=>";
const char eol[] = "\n\r";
class IsWhiteSpace {
public:
bool operator()(const char& c) const {
return IsAsciiWhitespace(c);
}
};
class IsNotWhiteSpace {
public:
bool operator()(const char& c) const {
return !IsAsciiWhitespace(c);
}
};
bool StartsWith(const char* cur, const char* end,
const char* tag, std::size_t size) {
return cur+size <= end && std::equal(tag, tag+size-1, cur);
}
} // namespace
BlacklistIO::BlacklistIO() {}
BlacklistIO::~BlacklistIO() {
for (std::list<Blacklist::Entry*>::iterator i = blacklist_.begin();
i != blacklist_.end(); ++i) {
delete *i;
}
for (std::list<Blacklist::Provider*>::iterator i = providers_.begin();
i != providers_.end(); ++i) {
delete *i;
}
}
bool BlacklistIO::Read(const FilePath& file) {
// Memory map for efficient parsing. If the file cannot fit in available
// memory it would be the least of our worries. Typical blacklist files
// are less than 200K.
file_util::MemoryMappedFile input;
if (!input.Initialize(file) || !input.data()) {
last_error_ = ASCIIToUTF16("File I/O error. Check path and permissions.");
return false;
}
const char* cur = reinterpret_cast<const char*>(input.data());
const char* end = cur + input.length();
// Check header.
if (!StartsWith(cur, end, header, arraysize(header))) {
last_error_ = ASCIIToUTF16("Incorrect header.");
return false;
}
Blacklist::Provider* provider = new Blacklist::Provider;
providers_.push_back(provider);
cur = std::find(cur, end, '\n') + 1; // Skip past EOL.
// Each loop iteration takes care of one input line.
while (cur < end) {
// Skip whitespace at beginning of line.
cur = std::find_if(cur, end, IsNotWhiteSpace());
if (cur == end)
break;
if (*cur == '#') {
cur = std::find(cur, end, '\n') + 1;
continue;
}
if (*cur == '|') {
++cur;
if (StartsWith(cur, end, name_tag, arraysize(name_tag))) {
// Edge condition: if the find below fails, the next one will too,
// so we'll just skip to the EOF below.
cur = std::find_if(cur+arraysize(name_tag), end, IsNotWhiteSpace());
const char* skip = std::find_if(cur, end, IsWhiteSpace());
if (skip < end)
provider->set_name(std::string(cur, skip));
} else if (StartsWith(cur, end, url_tag, arraysize(url_tag))) {
cur = std::find_if(cur+arraysize(url_tag), end, IsNotWhiteSpace());
const char* skip = std::find_if(cur, end, IsWhiteSpace());
if (skip < end)
provider->set_url(std::string(cur, skip));
}
cur = std::find(cur, end, '\n') + 1;
continue;
}
const char* skip = std::find_if(cur, end, IsWhiteSpace());
std::string pattern(cur, skip);
cur = std::find_if(cur+pattern.size(), end, IsNotWhiteSpace());
if (!StartsWith(cur, end, arrow_tag, arraysize(arrow_tag))) {
last_error_ = ASCIIToUTF16("Missing => in rule.");
return false;
}
scoped_ptr<Blacklist::Entry> entry(new Blacklist::Entry(pattern, provider));
cur = std::find_if(cur+arraysize(arrow_tag), end, IsNotWhiteSpace());
skip = std::find_first_of(cur, end, eol, eol+2);
std::string buf(cur, skip);
cur = skip + 1;
StringTokenizer tokenier(buf, " (),\n\r");
tokenier.set_options(StringTokenizer::RETURN_DELIMS);
bool in_attribute = false;
unsigned int last_attribute = 0;
while (tokenier.GetNext()) {
if (tokenier.token_is_delim()) {
switch (*tokenier.token_begin()) {
case '(':
if (in_attribute) {
last_error_ =
ASCIIToUTF16("Unexpected ( in attribute parameters.");
return false;
}
in_attribute = true;
continue;
case ')':
if (!in_attribute) {
last_error_ = ASCIIToUTF16("Unexpected ) in attribute list.");
return false;
}
in_attribute = false;
continue;
default:
// No state change for other delimiters.
continue;
}
}
if (in_attribute) {
// The only attribute to support sub_tokens is kBlockByType, for now.
if (last_attribute == Blacklist::kBlockByType)
entry->AddType(tokenier.token());
} else {
// Filter attribute. Unrecognized attributes are ignored.
last_attribute = Blacklist::String2Attribute(tokenier.token());
entry->AddAttributes(last_attribute);
}
}
blacklist_.push_back(entry.release());
}
return true;
}
bool BlacklistIO::Write(const FilePath& file) {
BlacklistStoreOutput output(file_util::OpenFile(file, "wb"));
if (!output.is_good()) {
last_error_ = ASCIIToUTF16("Error opening file for writing.");
return false;
}
// Output providers, give each one an index.
std::map<const Blacklist::Provider*, uint32> index;
uint32 current = 0;
if (!output.ReserveProviders(providers_.size())) {
last_error_ = ASCIIToUTF16("Error writing to file.");
return false;
}
for (std::list<Blacklist::Provider*>::const_iterator i = providers_.begin();
i != providers_.end(); ++i, ++current) {
if (!output.StoreProvider((*i)->name(), (*i)->url())) {
last_error_ = ASCIIToUTF16("Error writing to file.");
return false;
}
index[*i] = current;
}
// Output entries, replacing the provider with its index.
if (!output.ReserveEntries(blacklist_.size())) {
last_error_ = ASCIIToUTF16("Error writing to file.");
return false;
}
for (std::list<Blacklist::Entry*>::const_iterator i = blacklist_.begin();
i != blacklist_.end(); ++i) {
if (!output.StoreEntry((*i)->pattern_,
(*i)->attributes_,
(*i)->types_,
index[(*i)->provider_])) {
last_error_ = ASCIIToUTF16("Error writing to file.");
return false;
}
}
return true;
}
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