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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/extensions/convert_user_script.h"
#include <string>
#include <vector>
#include "base/base64.h"
#include "base/file_path.h"
#include "base/file_util.h"
#include "base/scoped_temp_dir.h"
#include "base/sha2.h"
#include "base/string_util.h"
#include "chrome/browser/extensions/user_script_master.h"
#include "chrome/common/extensions/extension.h"
#include "chrome/common/extensions/extension_constants.h"
#include "chrome/common/extensions/user_script.h"
#include "chrome/common/json_value_serializer.h"
#include "googleurl/src/gurl.h"
namespace keys = extension_manifest_keys;
Extension* ConvertUserScriptToExtension(const FilePath& user_script_path,
const GURL& original_url,
std::string* error) {
std::string content;
if (!file_util::ReadFileToString(user_script_path, &content)) {
*error = "Could not read source file: " +
WideToASCII(user_script_path.ToWStringHack());
return NULL;
}
UserScript script;
if (!UserScriptMaster::ScriptReloader::ParseMetadataHeader(content,
&script)) {
*error = "Invalid script header.";
return NULL;
}
ScopedTempDir temp_dir;
if (!temp_dir.CreateUniqueTempDir()) {
*error = "Could not create temporary directory.";
return NULL;
}
// Create the manifest
scoped_ptr<DictionaryValue> root(new 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[base::SHA256_LENGTH] = {0};
std::string key;
base::SHA256HashString(script_name, raw, base::SHA256_LENGTH);
base::Base64Encode(std::string(raw, base::SHA256_LENGTH), &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(keys::kName, script.name());
else
root->SetString(keys::kName, original_url.ExtractFileName());
root->SetString(keys::kDescription, script.description());
root->SetString(keys::kVersion, "1.0");
root->SetString(keys::kPublicKey, key);
root->SetBoolean(keys::kConvertedFromUserScript, true);
ListValue* js_files = new ListValue();
js_files->Append(Value::CreateStringValue("script.js"));
// If the script provides its own match patterns, we use those. Otherwise, we
// generate some using the include globs.
ListValue* matches = new ListValue();
if (!script.url_patterns().empty()) {
for (size_t i = 0; i < script.url_patterns().size(); ++i) {
matches->Append(Value::CreateStringValue(
script.url_patterns()[i].GetAsString()));
}
} else {
// TODO(aa): Derive tighter matches where possible.
matches->Append(Value::CreateStringValue("http://*/*"));
matches->Append(Value::CreateStringValue("https://*/*"));
}
ListValue* includes = new ListValue();
for (size_t i = 0; i < script.globs().size(); ++i)
includes->Append(Value::CreateStringValue(script.globs().at(i)));
ListValue* excludes = new ListValue();
for (size_t i = 0; i < script.exclude_globs().size(); ++i)
excludes->Append(Value::CreateStringValue(script.exclude_globs().at(i)));
DictionaryValue* content_script = new DictionaryValue();
content_script->Set(keys::kMatches, matches);
content_script->Set(keys::kIncludeGlobs, includes);
content_script->Set(keys::kExcludeGlobs, excludes);
content_script->Set(keys::kJs, js_files);
ListValue* content_scripts = new ListValue();
content_scripts->Append(content_script);
root->Set(keys::kContentScripts, content_scripts);
FilePath manifest_path = temp_dir.path().Append(
Extension::kManifestFilename);
JSONFileValueSerializer serializer(manifest_path);
if (!serializer.Serialize(*root)) {
*error = "Could not write JSON.";
return NULL;
}
// Write the script file.
if (!file_util::CopyFile(user_script_path,
temp_dir.path().AppendASCII("script.js"))) {
*error = "Could not copy script file.";
return NULL;
}
scoped_ptr<Extension> extension(new Extension(temp_dir.path()));
if (!extension->InitFromValue(*root, false, error)) {
NOTREACHED() << "Could not init extension " << *error;
return NULL;
}
temp_dir.Take(); // The caller takes ownership of the directory.
return extension.release();
}
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