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content.js
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308 lines (269 loc) · 10.2 KB
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// Content Script (ISOLATED world)
// 作为桥接层,负责在页面脚本和扩展API之间传递消息
(function() {
'use strict';
// 读取配置并注入对应脚本
chrome.storage.local.get([
'webauthn_compat_mode',
'webauthn_allow_polyfill_override'
], (result) => {
const compatMode = result.webauthn_compat_mode || false;
const allowPolyfillOverride = result.webauthn_allow_polyfill_override !== false; // 默认 true
// 根据兼容模式配置选择注入的脚本
const scriptFile = compatMode ? 'inject-compat.js' : 'inject.js';
// 注入脚本到页面的MAIN world
const script = document.createElement('script');
script.src = chrome.runtime.getURL(scriptFile);
// 通过 dataset 传递配置到注入的脚本
script.dataset.allowPolyfillOverride = String(allowPolyfillOverride);
script.onnload = function() {
this.remove();
};
(document.head || document.documentElement).appendChild(script);
});
// 检查扩展上下文是否有效
function isExtensionContextValid() {
try {
return !!chrome.runtime?.id;
} catch (e) {
return false;
}
}
// 监听来自页面的消息
window.addEventListener('message', function(event) {
// 只接受来自同源的消息
if (event.source !== window) return;
// 处理配置查询请求
if (event.data && event.data.type === 'WEBAUTHN_GET_CONFIG') {
const { requestId, configKey } = event.data;
if (!isExtensionContextValid()) {
window.postMessage({
type: 'WEBAUTHN_CONFIG_RESPONSE',
requestId: requestId,
enabled: false
}, '*');
return;
}
// 直接读取配置并返回（无需经过 background）
try {
chrome.storage.local.get([configKey], (result) => {
window.postMessage({
type: 'WEBAUTHN_CONFIG_RESPONSE',
requestId: requestId,
enabled: result[configKey] || false
}, '*');
});
} catch (error) {
console.error('[WebAuthn Compat] 读取配置失败:', error);
window.postMessage({
type: 'WEBAUTHN_CONFIG_RESPONSE',
requestId: requestId,
enabled: false
}, '*');
}
return;
}
// 处理兼容模式存储请求
if (event.data && event.data.type === 'WEBAUTHN_STORAGE_REQUEST') {
handleStorageRequest(event.data);
return;
}
if (event.data && (event.data.type === 'WEBAUTHN_CREATE' || event.data.type === 'WEBAUTHN_GET')) {
const { type, requestId, options } = event.data;
// 检查扩展上下文是否有效
if (!isExtensionContextValid()) {
window.postMessage({
type: 'WEBAUTHN_RESPONSE',
requestId: requestId,
success: false,
error: 'The operation either timed out or was not allowed.'
}, '*');
return;
}
// options 已经在 inject.js 中序列化过了,直接使用
// 转发到background script (V3: 不等待响应,通过推送监听器接收结果)
const messageType = type === 'WEBAUTHN_CREATE' ? 'webauthn_create' : 'webauthn_get';
try {
chrome.runtime.sendMessage({
type: messageType,
options: options,
requestId: requestId // 传递requestId供background使用
});
} catch (error) {
// 扩展上下文失效（扩展被重新加载或禁用）
console.error('[WebAuthn Compat] Failed to send message:', error);
window.postMessage({
type: 'WEBAUTHN_RESPONSE',
requestId: requestId,
success: false,
error: 'The operation either timed out or was not allowed.'
}, '*');
}
// V3: 响应将通过 chrome.runtime.onMessage 监听器接收 (见下方推送监听器)
}
});
// V3: 监听来自background的主动推送
chrome.runtime.onMessage.addListener((message, sender) => {
if (message.type === 'webauthn_response') {
// 转发给页面
window.postMessage({
type: 'WEBAUTHN_RESPONSE',
requestId: message.requestId,
success: message.success,
credential: message.credential,
error: message.error
}, '*');
} else if (message.type === 'webauthn_config_response') {
// 转发配置响应给页面
window.postMessage({
type: 'WEBAUTHN_CONFIG_RESPONSE',
requestId: message.requestId,
enabled: message.enabled
}, '*');
}
});
// ==================== 兼容模式存储桥接处理器 ====================
// 辅助函数: ArrayBuffer 转 hex 字符串
function bufferToHex(buffer) {
return Array.from(new Uint8Array(buffer))
.map(b => b.toString(16).padStart(2, '0'))
.join('');
}
// 辅助函数: hex 字符串转 ArrayBuffer
function hexToBuffer(hex) {
const bytes = new Uint8Array(hex.length / 2);
for (let i = 0; i < hex.length; i += 2) {
bytes[i / 2] = parseInt(hex.substr(i, 2), 16);
}
return bytes.buffer;
}
// 辅助函数: Array/ArrayBuffer 转 Base64URL
function arrayToBase64url(array) {
const bytes = new Uint8Array(array);
let binary = '';
for (let i = 0; i < bytes.length; i++) {
binary += String.fromCharCode(bytes[i]);
}
return btoa(binary).replace(/\+/g, '-').replace(/\//g, '_').replace(/=/g, '');
}
// 存储请求处理函数
async function handleStorageRequest(data) {
const { requestId, operation, data: opData } = data;
try {
let result;
switch (operation) {
case 'save':
// 保存凭证
const allData = await new Promise(resolve =>
chrome.storage.local.get(['webauthn_credentials'], r =>
resolve(r.webauthn_credentials || {})));
if (!allData[opData.rpId]) {
allData[opData.rpId] = {};
}
// 序列化 ArrayBuffer → hex
const storableCred = {
publicKey: bufferToHex(opData.credential.publicKey),
privateKey: bufferToHex(opData.credential.privateKey),
counter: opData.credential.counter,
algorithm: opData.credential.algorithm,
userHandle: bufferToHex(opData.credential.userHandle),
userId: opData.credential.userId,
userName: opData.credential.userName,
userDisplayName: opData.credential.userDisplayName,
rpId: opData.credential.rpId,
rpName: opData.credential.rpName,
createTime: opData.credential.createTime
};
allData[opData.rpId][opData.credentialId] = storableCred;
await new Promise(resolve =>
chrome.storage.local.set({ webauthn_credentials: allData }, resolve));
result = { success: true };
break;
case 'find':
// 查找凭证（返回 Array 格式）
const credentials = await new Promise(resolve => {
chrome.storage.local.get(['webauthn_credentials'], r => {
const allCreds = r.webauthn_credentials || {};
const rpCreds = allCreds[opData.rpId] || {};
const result = [];
for (const [credId, cred] of Object.entries(rpCreds)) {
// allowCredentials 过滤
if (opData.allowCredentials?.length > 0) {
const allowed = opData.allowCredentials.some(a =>
arrayToBase64url(a.id) === credId);
if (!allowed) continue;
}
result.push({
credentialId: credId,
publicKey: Array.from(new Uint8Array(hexToBuffer(cred.publicKey))),
privateKey: Array.from(new Uint8Array(hexToBuffer(cred.privateKey))),
counter: cred.counter,
algorithm: cred.algorithm || -7,
userHandle: Array.from(new Uint8Array(hexToBuffer(cred.userHandle))),
userId: cred.userId,
userName: cred.userName,
userDisplayName: cred.userDisplayName,
rpId: cred.rpId,
rpName: cred.rpName,
createTime: cred.createTime
});
}
resolve(result);
});
});
result = credentials;
break;
case 'updateCounter':
// 更新计数器
const updateData = await new Promise(resolve =>
chrome.storage.local.get(['webauthn_credentials'], r =>
resolve(r.webauthn_credentials || {})));
if (updateData[opData.rpId]?.[opData.credentialId]) {
updateData[opData.rpId][opData.credentialId].counter = opData.counter;
await new Promise(resolve =>
chrome.storage.local.set({ webauthn_credentials: updateData }, resolve));
}
result = { success: true };
break;
case 'getConfig':
// 读取配置
result = await new Promise(resolve =>
chrome.storage.local.get([opData.key], r => resolve(r[opData.key] || false)));
break;
case 'getByRpId':
// 获取所有凭证（用于 excludeCredentials 检查）
const rpData = await new Promise(resolve =>
chrome.storage.local.get(['webauthn_credentials'], r => {
const allCreds = r.webauthn_credentials || {};
resolve(allCreds[opData.rpId] || {});
}));
result = {};
for (const [credId, cred] of Object.entries(rpData)) {
result[credId] = {
publicKey: Array.from(new Uint8Array(hexToBuffer(cred.publicKey))),
privateKey: Array.from(new Uint8Array(hexToBuffer(cred.privateKey))),
userHandle: Array.from(new Uint8Array(hexToBuffer(cred.userHandle)))
};
}
break;
default:
throw new Error('Unknown operation: ' + operation);
}
// 返回成功
window.postMessage({
type: 'WEBAUTHN_STORAGE_RESPONSE',
requestId,
success: true,
result
}, '*');
} catch (error) {
console.error('[WebAuthn Compat] 存储操作失败:', error);
window.postMessage({
type: 'WEBAUTHN_STORAGE_RESPONSE',
requestId,
success: false,
error: error.message
}, '*');
}
}
})();