How to implement AutoFill Credential Provider Extensions - iOS 11, swift4 - ios

Question

I have been working in iOS autofill credential extension since long days. I have checked so many iOS articles and videos. But I am not able to show credential on quick type bar, reset things are successfully integrated. Can any give me quick help?
Using this video and url which was shared from apple:
https://developer.apple.com/videos/play/wwdc2018/721
https://developer.apple.com/documentation/authenticationservices
I am using below code to save credential to Keychain for particular domain.
let keychain = Keychain(server: "instagram.com", protocolType: .https, authenticationType: .htmlForm)
keychain["emailAddress"] = "Password"
And use this code for save domain:
func savedomain(domain: String, account: String, password: String, completion: ((Bool, SharedWebCredentialsManagerError?) -> Void)? = nil) {
SecAddSharedWebCredential(domain as CFString, account as CFString, password as CFString?) { error in
guard let error = error else {
completion?(true, nil)
return
}
let errorDescription = CFErrorCopyDescription(error) as String
let saveFailedError = SharedWebCredentialsManagerError.saveFailed(errorDescription)
completion?(false, saveFailedError)
}
}
I have created autofill extension and getting saved credentials, but not able to display credential on quick type bar in safari for instagram.com

Answer 1

I have implemented autofill extension for all social sites, Sharing my source code to save emailID-Password with domain.
class func save(key: String, data: Data) -> OSStatus {
let query = [
kSecClass as String : kSecClassGenericPassword as String,
kSecAttrAccount as String : key,
kSecValueData as String : data ] as [String : Any]
SecItemDelete(query as CFDictionary)
return SecItemAdd(query as CFDictionary, nil)
}
Above "Save" function i have written in my custom KeyChainManager class, Also i added below code in KeyChainManager class which is as below.
extension Data {
init<T>(from value: T) {
var value = value
self.init(buffer: UnsafeBufferPointer(start: &value, count: 1))
}
func to<T>(type: T.Type) -> T {
return self.withUnsafeBytes { $0.load(as: T.self) }
}
}
I am saving my data from VC by calling our KeyChainManager class like below:
let email = (txtEmail?.text ?? "").trimmingCharacters(in: .whitespacesAndNewlines)
let password = (txtPassword?.text ?? "").trimmingCharacters(in: .whitespacesAndNewlines)
let domain = (txtDomain?.text ?? "").lowercased().trimmingCharacters(in: .whitespacesAndNewlines)
let user = User(email: email, password: password, key: self.key, domain: domain, identifier: self.keyIdentifier)
let data = (try? JSONEncoder().encode(user)) ?? Data()
let _ = KeyChain.save(key: "\(self.keyIdentifier)", data: data)
This all stuff is for saving our credentials, Now major point is how to list all saved credentials in our extension's CredentialProviderViewController.swift.
For that i added below method in KeyChainManager class :
class func load(key: String) -> Data? {
let query = [
kSecClass as String : kSecClassGenericPassword,
kSecAttrAccount as String : key,
kSecReturnData as String : kCFBooleanTrue!,
kSecMatchLimit as String : kSecMatchLimitOne ] as [String : Any]
var dataTypeRef: AnyObject? = nil
let status: OSStatus = SecItemCopyMatching(query as CFDictionary, &dataTypeRef)
if status == noErr {
return dataTypeRef as! Data?
} else {
return nil
}
}
And calling this function from extension's CredentialProviderViewController.swift like this:
users.removeAll()
for i in 0..<1000000 {
if let encodedData = KeyChain.load(key: "\(i)") {
let user = try! JSONDecoder().decode(User.self, from: encodedData)
if user.key == key && ((serviceIdentifier.contains(user.domain ?? "")) ) {
users.append(user)
}
}else{
break
}
}
I hope this content helps you as i spent many days to create just one demo :) :)
Comment below, If its helps you :) :)
Thanks,
Anjali.

Answer 2

You need to populate ASCredentialIdentityStore in order for the quicktype bar to work. See the description of ASCredentialProviderViewController:
Optionally add ASPasswordCredentialIdentity instances to the shared ASCredentialIdentityStore to make identities available directly in the QuickType bar.
This is also described in the WWDC presentation you reference.

Answer 3

How I implemented population of ASCredentialIdentityStore:
var firstItem = ASPasswordCredentialIdentity(serviceIdentifier: ASCredentialServiceIdentifier(identifier: "https://online.somebank.com/auth/login", type: .URL), user: "login#bank.com", recordIdentifier: nil)
ASCredentialIdentityStore.shared.replaceCredentialIdentities(with: [firstItem]) { result, error in
if result {
print("saved")
}
}
In my case everything works perfect.
So I fetch all passwords from remote and then populate ASCredentialIdentityStore with available passwords.