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// Copyright (c) 2012 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/extensions/convert_user_script.h"
#include <stddef.h>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "base/base64.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_temp_dir.h"
#include "base/json/json_file_value_serializer.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/values.h"
#include "chrome/common/chrome_paths.h"
#include "crypto/sha2.h"
#include "extensions/browser/extension_user_script_loader.h"
#include "extensions/common/constants.h"
#include "extensions/common/extension.h"
#include "extensions/common/file_util.h"
#include "extensions/common/manifest_constants.h"
#include "extensions/common/user_script.h"
#include "url/gurl.h"
namespace extensions {
scoped_refptr<Extension> ConvertUserScriptToExtension(
const base::FilePath& user_script_path, const GURL& original_url,
const base::FilePath& extensions_dir, base::string16* error) {
std::string content;
if (!base::ReadFileToString(user_script_path, &content)) {
*error = base::ASCIIToUTF16("Could not read source file.");
return NULL;
}
if (!base::IsStringUTF8(content)) {
*error = base::ASCIIToUTF16("User script must be UTF8 encoded.");
return NULL;
}
UserScript script;
if (!UserScriptLoader::ParseMetadataHeader(content, &script)) {
*error = base::ASCIIToUTF16("Invalid script header.");
return NULL;
}
base::FilePath install_temp_dir =
file_util::GetInstallTempDir(extensions_dir);
if (install_temp_dir.empty()) {
*error = base::ASCIIToUTF16(
"Could not get path to profile temporary directory.");
return NULL;
}
base::ScopedTempDir temp_dir;
if (!temp_dir.CreateUniqueTempDirUnderPath(install_temp_dir)) {
*error = base::ASCIIToUTF16("Could not create temporary directory.");
return NULL;
}
// Create the manifest
std::unique_ptr<base::DictionaryValue> root(new base::DictionaryValue);
std::string script_name;
if (!script.name().empty() && !script.name_space().empty())
script_name = script.name_space() + "/" + script.name();
else
script_name = original_url.spec();
// Create the public key.
// User scripts are not signed, but the public key for an extension doubles as
// its unique identity, and we need one of those. A user script's unique
// identity is its namespace+name, so we hash that to create a public key.
// There will be no corresponding private key, which means user scripts cannot
// be auto-updated, or claimed in the gallery.
char raw[crypto::kSHA256Length] = {0};
std::string key;
crypto::SHA256HashString(script_name, raw, crypto::kSHA256Length);
base::Base64Encode(base::StringPiece(raw, crypto::kSHA256Length), &key);
// The script may not have a name field, but we need one for an extension. If
// it is missing, use the filename of the original URL.
if (!script.name().empty())
root->SetString(manifest_keys::kName, script.name());
else
root->SetString(manifest_keys::kName, original_url.ExtractFileName());
// Not all scripts have a version, but we need one. Default to 1.0 if it is
// missing.
if (!script.version().empty())
root->SetString(manifest_keys::kVersion, script.version());
else
root->SetString(manifest_keys::kVersion, "1.0");
root->SetString(manifest_keys::kDescription, script.description());
root->SetString(manifest_keys::kPublicKey, key);
root->SetBoolean(manifest_keys::kConvertedFromUserScript, true);
auto js_files = std::make_unique<base::ListValue>();
js_files->AppendString("script.js");
// If the script provides its own match patterns, we use those. Otherwise, we
// generate some using the include globs.
auto matches = std::make_unique<base::ListValue>();
if (!script.url_patterns().is_empty()) {
for (auto i = script.url_patterns().begin();
i != script.url_patterns().end(); ++i) {
matches->AppendString(i->GetAsString());
}
} else {
// TODO(aa): Derive tighter matches where possible.
matches->AppendString("http://*/*");
matches->AppendString("https://*/*");
}
// Read the exclude matches, if any are present.
auto exclude_matches = std::make_unique<base::ListValue>();
if (!script.exclude_url_patterns().is_empty()) {
for (auto i = script.exclude_url_patterns().begin();
i != script.exclude_url_patterns().end(); ++i) {
exclude_matches->AppendString(i->GetAsString());
}
}
auto includes = std::make_unique<base::ListValue>();
for (size_t i = 0; i < script.globs().size(); ++i)
includes->AppendString(script.globs().at(i));
auto excludes = std::make_unique<base::ListValue>();
for (size_t i = 0; i < script.exclude_globs().size(); ++i)
excludes->AppendString(script.exclude_globs().at(i));
auto content_script = std::make_unique<base::DictionaryValue>();
content_script->Set(manifest_keys::kMatches, std::move(matches));
content_script->Set(manifest_keys::kExcludeMatches,
std::move(exclude_matches));
content_script->Set(manifest_keys::kIncludeGlobs, std::move(includes));
content_script->Set(manifest_keys::kExcludeGlobs, std::move(excludes));
content_script->Set(manifest_keys::kJs, std::move(js_files));
if (script.run_location() == UserScript::DOCUMENT_START)
content_script->SetString(manifest_keys::kRunAt,
manifest_values::kRunAtDocumentStart);
else if (script.run_location() == UserScript::DOCUMENT_END)
content_script->SetString(manifest_keys::kRunAt,
manifest_values::kRunAtDocumentEnd);
else if (script.run_location() == UserScript::DOCUMENT_IDLE)
// This is the default, but store it just in case we change that.
content_script->SetString(manifest_keys::kRunAt,
manifest_values::kRunAtDocumentIdle);
auto content_scripts = std::make_unique<base::ListValue>();
content_scripts->Append(std::move(content_script));
root->Set(manifest_keys::kContentScripts, std::move(content_scripts));
base::FilePath manifest_path = temp_dir.GetPath().Append(kManifestFilename);
JSONFileValueSerializer serializer(manifest_path);
if (!serializer.Serialize(*root)) {
*error = base::ASCIIToUTF16("Could not write JSON.");
return NULL;
}
// Write the script file.
if (!base::CopyFile(user_script_path,
temp_dir.GetPath().AppendASCII("script.js"))) {
*error = base::ASCIIToUTF16("Could not copy script file.");
return NULL;
}
// TODO(rdevlin.cronin): Continue removing std::string errors and replacing
// with base::string16
std::string utf8_error;
scoped_refptr<Extension> extension =
Extension::Create(temp_dir.GetPath(), Manifest::INTERNAL, *root,
Extension::NO_FLAGS, &utf8_error);
*error = base::UTF8ToUTF16(utf8_error);
if (!extension.get()) {
NOTREACHED() << "Could not init extension " << *error;
return NULL;
}
temp_dir.Take(); // The caller takes ownership of the directory.
return extension;
}
} // namespace extensions
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