added DeviceContactHandler - fetches Device Contacts

deltachat-ios/DeviceContactsHandler.swift

@@ -0,0 +1,86 @@
+//
+//  DeviceContactsHandler.swift
+//  deltachat-ios
+//
+//  Created by Bastian van de Wetering on 26.04.19.
+//  Copyright © 2019 Jonas Reinsch. All rights reserved.
+//
+
+import Contacts
+import UIKit
+
+// MARK - ContactModel
+
+struct DeviceContact {
+	let displayName: String
+	let emailAddresses: [String]
+}
+
+class DeviceContactsHandler {
+
+	private let store = CNContactStore()
+
+
+	public func getContacts() -> [DeviceContact] {
+			let storedContacts = self.fetchContactsWithEmailFromDevice()
+			let contacts = storedContacts.map({self.makeContact(from: $0)})
+		return contacts
+	}
+
+
+	private func fetchContactsWithEmailFromDevice() -> [CNContact] {
+		var fetchedContacts: [CNContact] = []
+
+		// takes id from userDefaults (system settings)
+		let defaultContainerId = store.defaultContainerIdentifier()
+		let predicates = CNContact.predicateForContactsInContainer(withIdentifier: defaultContainerId)
+		let keys = [CNContactFamilyNameKey, CNContactGivenNameKey, CNContactEmailAddressesKey]
+		let request = CNContactFetchRequest(keysToFetch: keys as [CNKeyDescriptor])
+		request.mutableObjects = true
+		request.unifyResults = true
+		request.sortOrder = .userDefault
+		request.predicate = predicates
+
+		do {
+			try store.enumerateContacts(with: request) {(contact, error) in
+				if !contact.emailAddresses.isEmpty {
+					fetchedContacts.append(contact)
+				}
+			}
+		} catch let error {
+			print(error)
+		}
+		return fetchedContacts
+	}
+
+	private func makeContact(from contact: CNContact) -> DeviceContact {
+		let rawDisplayName: String = "\(contact.givenName) \(contact.familyName)"
+		let displayName = rawDisplayName.trimmingCharacters(in: .whitespacesAndNewlines)
+		let emailAdresses = contact.emailAddresses.map({String($0.value)})
+		return DeviceContact(displayName: displayName, emailAddresses: emailAdresses)
+	}
+
+	func requestDeviceContacts(delegate: DeviceContactsDelegate) {
+		switch CNContactStore.authorizationStatus(for: .contacts) {
+		case .authorized:
+			let contacts = getContacts()
+			delegate.setContacts(contacts: contacts)
+		case .denied:
+			delegate.accessDenied()
+		case .restricted, .notDetermined:
+			store.requestAccess(for: .contacts) {[unowned self] granted, error in
+				if granted {
+					DispatchQueue.main.async {
+						let contacts = self.getContacts()
+						delegate.setContacts(contacts: contacts)
+					}
+				} else {
+					DispatchQueue.main.async {
+						delegate.accessDenied()
+					}
+				}
+			}
+		}
+	}
+
+}