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SafariWebExtensionHandler.swift
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SafariWebExtensionHandler.swift
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import SafariServices
import os.log
import LocalAuthentication
let SFExtensionMessageKey = "message"
let ServiceName = "Bitwarden"
let ServiceNameBiometric = ServiceName + "_biometric"
class SafariWebExtensionHandler: NSObject, NSExtensionRequestHandling {
func beginRequest(with context: NSExtensionContext) {
let item = context.inputItems[0] as! NSExtensionItem
let message = item.userInfo?[SFExtensionMessageKey] as AnyObject?
os_log(.default, "Received message from browser.runtime.sendNativeMessage: %@", message as! CVarArg)
let response = NSExtensionItem()
guard let command = message?["command"] as? String else {
return
}
switch (command) {
case "readFromClipboard":
let pasteboard = NSPasteboard.general
response.userInfo = [ SFExtensionMessageKey: pasteboard.pasteboardItems?.first?.string(forType: .string) as Any ]
break
case "copyToClipboard":
guard let msg = message?["data"] as? String else {
return
}
let pasteboard = NSPasteboard.general
pasteboard.clearContents()
pasteboard.setString(msg, forType: .string)
case "showPopover":
SFSafariApplication.getActiveWindow { win in
win?.getToolbarItem(completionHandler: { item in
item?.showPopover()
})
}
break
case "downloadFile":
guard let jsonData = message?["data"] as? String else {
return
}
guard let dlMsg: DownloadFileMessage = jsonDeserialize(json: jsonData) else {
return
}
var blobData: Data?
if dlMsg.blobOptions?.type == "text/plain" {
blobData = dlMsg.blobData?.data(using: .utf8)
} else if let blob = dlMsg.blobData {
blobData = Data(base64Encoded: blob)
}
guard let data = blobData else {
return
}
let panel = NSSavePanel()
panel.isFloatingPanel = true
panel.canCreateDirectories = true
panel.nameFieldStringValue = dlMsg.fileName
panel.begin { response in
if response == NSApplication.ModalResponse.OK {
if let url = panel.url {
do {
let fileManager = FileManager.default
if !fileManager.fileExists(atPath: url.absoluteString) {
fileManager.createFile(atPath: url.absoluteString, contents: Data(),
attributes: nil)
}
try data.write(to: url)
} catch {
print(error)
NSLog("ERROR in downloadFile, \(error)")
}
}
}
}
break
case "sleep":
DispatchQueue.main.asyncAfter(deadline: .now() + 10) {
context.completeRequest(returningItems: [response], completionHandler: nil)
}
return
case "biometricUnlock":
var error: NSError?
let laContext = LAContext()
laContext.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &error)
if let e = error, e.code != kLAErrorBiometryLockout {
response.userInfo = [
SFExtensionMessageKey: [
"message": [
"command": "biometricUnlock",
"response": "not supported",
"timestamp": Int64(NSDate().timeIntervalSince1970 * 1000),
],
],
]
break
}
guard let accessControl = SecAccessControlCreateWithFlags(nil, kSecAttrAccessibleWhenUnlockedThisDeviceOnly, [.privateKeyUsage, .userPresence], nil) else {
response.userInfo = [
SFExtensionMessageKey: [
"message": [
"command": "biometricUnlock",
"response": "not supported",
"timestamp": Int64(NSDate().timeIntervalSince1970 * 1000),
],
],
]
break
}
laContext.evaluateAccessControl(accessControl, operation: .useKeySign, localizedReason: "Bitwarden Safari Extension") { (success, error) in
if success {
let passwordName = "key"
var passwordLength: UInt32 = 0
var passwordPtr: UnsafeMutableRawPointer? = nil
var status = SecKeychainFindGenericPassword(nil, UInt32(ServiceNameBiometric.utf8.count), ServiceNameBiometric, UInt32(passwordName.utf8.count), passwordName, &passwordLength, &passwordPtr, nil)
if status != errSecSuccess {
status = SecKeychainFindGenericPassword(nil, UInt32(ServiceName.utf8.count), ServiceName, UInt32(passwordName.utf8.count), passwordName, &passwordLength, &passwordPtr, nil)
}
if status == errSecSuccess {
let result = NSString(bytes: passwordPtr!, length: Int(passwordLength), encoding: String.Encoding.utf8.rawValue) as String?
SecKeychainItemFreeContent(nil, passwordPtr)
response.userInfo = [ SFExtensionMessageKey: [
"message": [
"command": "biometricUnlock",
"response": "unlocked",
"timestamp": Int64(NSDate().timeIntervalSince1970 * 1000),
"keyB64": result!.replacingOccurrences(of: "\"", with: ""),
],
]]
} else {
response.userInfo = [
SFExtensionMessageKey: [
"message": [
"command": "biometricUnlock",
"response": "not enabled",
"timestamp": Int64(NSDate().timeIntervalSince1970 * 1000),
],
],
]
}
}
context.completeRequest(returningItems: [response], completionHandler: nil)
}
return
default:
return
}
context.completeRequest(returningItems: [response], completionHandler: nil)
}
}
func jsonSerialize<T: Encodable>(obj: T?) -> String? {
let encoder = JSONEncoder()
do {
let data = try encoder.encode(obj)
return String(data: data, encoding: .utf8) ?? "null"
} catch _ {
return "null"
}
}
func jsonDeserialize<T: Decodable>(json: String?) -> T? {
if json == nil {
return nil
}
let decoder = JSONDecoder()
do {
let obj = try decoder.decode(T.self, from: json!.data(using: .utf8)!)
return obj
} catch _ {
return nil
}
}
class DownloadFileMessage: Decodable, Encodable {
var fileName: String
var blobData: String?
var blobOptions: DownloadFileMessageBlobOptions?
}
class DownloadFileMessageBlobOptions: Decodable, Encodable {
var type: String?
}