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DocuSignManager.swift
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DocuSignManager.swift
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//
// DocuSignService.swift
//
// Created by Алекс Ломовской on 28.04.2022.
//
import Foundation
import UIKit
import AuthenticationServices
import RxSwift
import RxCocoa
import PDFKit
// MARK: - Protocol
protocol DocuSignManager {
var bag: DisposeBag { get }
var error: Driver<String> { get }
var isWorking: Driver<Bool> { get }
var templatePDF: Driver<PDFDocument> { get }
var templateToShareData: Driver<Data> { get }
var signingURL: Driver<URL> { get }
var authorizeUserEvent: BehaviorEvent { get }
var showTemplatePreviewEvent: PublishRelay<String> { get }
var loadTemplateForSharingEvent: BehaviorEvent { get }
var envelopeSigningData: AnyObserver<SignEnvelopeRequestDTO?> { get }
}
// MARK: - DocuSignManager
final class DocuSignManagerImpl: DocuSignManager {
private let docuSignService: DocuSignService = DocuSignServiceImpl()
private let fileStorageManager: FileStorageManager = FileStorageManagerImpl()
init() {
bindEvents()
}
// MARK: - Events
let bag = DisposeBag()
let authorizeUserEvent = BehaviorEvent()
let showTemplatePreviewEvent = PublishRelay<String>()
let loadTemplateForSharingEvent = BehaviorEvent()
private let envelopeSigningDataSubject = BehaviorSubject<SignEnvelopeRequestDTO?>(value: nil)
var envelopeSigningData: AnyObserver<SignEnvelopeRequestDTO?> {
return envelopeSigningDataSubject
.asObserver()
}
private let isWorkingSubject = PublishSubject<Bool>()
var isWorking: Driver<Bool> {
return Driver<Bool>.merge([
isWorkingSubject
.asDriver(onErrorJustReturn: false),
docuSignService.isLoading
.asDriver(onErrorJustReturn: false)
])
}
private let errorSubject = BehaviorSubject<String?>(value: nil)
var error: Driver<String> {
return errorSubject
.asDriver(onErrorJustReturn: nil)
.unwrap()
}
private let templatePDFSubject = BehaviorSubject<PDFDocument?>(value: nil)
var templatePDF: Driver<PDFDocument> {
return templatePDFSubject
.asDriver(onErrorJustReturn: nil)
.unwrap()
}
private let templateToShareDataSubject = BehaviorSubject<Data?>(value: nil)
var templateToShareData: Driver<Data> {
return templateToShareDataSubject
.asDriver(onErrorJustReturn: nil)
.unwrap()
}
private let signingURLSubject = BehaviorSubject<URL?>(value: nil)
var signingURL: Driver<URL> {
return signingURLSubject
.asDriver(onErrorJustReturn: nil)
.unwrap()
}
// MARK: - Private
private let accessTokenSubject = BehaviorSubject<String>(value: "")
private let accountIDSubject = BehaviorSubject<String>(value: "")
}
// MARK: - Binding
private extension DocuSignManagerImpl {
func bindEvents() {
bindAuthorizeUserEvent()
bindAccessCode()
bindSignEnvelopeEvent()
bindShowTemplatePreviewEvent()
bindShareTemplateEvent()
}
// MARK: - Bind accessCode
func bindAuthorizeUserEvent() {
let accessTokenObservable = authorizeUserEvent
.asObservable()
.flatMap { [weak self] _ -> Observable<BaseResponseDTO<String>> in
guard let self = self else { return Observable.empty() }
return self.docuSignService.getAccessToken()
}
.materialize()
.share()
accessTokenObservable
.errors()
.map { $0.localizedDescription }
.bind(to: errorSubject)
.disposed(by: bag)
accessTokenObservable
.elements()
.map { $0.errorMessage }
.unwrap()
.filter { $0.isNotEmpty }
.bind(to: errorSubject)
.disposed(by: bag)
accessTokenObservable
.elements()
.map { $0.data }
.unwrap()
.bind(to: accessTokenSubject)
.disposed(by: bag)
}
// MARK: - Bind AccessToken
func bindAccessCode() {
let accountIDObservable = accessTokenSubject
.filter { $0.isNotEmpty }
.do(onNext: { token in
KeyChainStorageManager.shared.set(string: token, forKey: Constants.PersistantStores.Keychain.docuSignToken)
})
.flatMap { [weak self] _ -> Observable<BaseResponseDTO<String>> in
guard let self = self else { return Observable.empty() }
return self.docuSignService.getAccountID()
}
.materialize()
.share()
accountIDObservable
.errors()
.map { $0.localizedDescription }
.bind(to: errorSubject)
.disposed(by: bag)
accountIDObservable
.elements()
.map { $0.errorMessage }
.unwrap()
.filter { $0.isNotEmpty }
.bind(to: errorSubject)
.disposed(by: bag)
accountIDObservable
.elements()
.map { $0.data }
.unwrap()
.bind(to: accountIDSubject)
.disposed(by: bag)
}
// MARK: - SignEnvelope
func bindSignEnvelopeEvent() {
let signingURLObservable = envelopeSigningDataSubject
.unwrap()
.asObservable()
.flatMap { [weak self] data -> Observable<BaseResponseDTO<String>> in
guard let self = self else { return Observable.empty() }
return self.docuSignService.getSigningURL(for: data)
}
.materialize()
.share()
signingURLObservable
.errors()
.map { $0.localizedDescription }
.bind(to: errorSubject)
.disposed(by: bag)
signingURLObservable
.elements()
.map { $0.errorMessage }
.unwrap()
.filter { $0.isNotEmpty }
.bind(to: errorSubject)
.disposed(by: bag)
signingURLObservable
.elements()
.map { $0.data }
.unwrap()
.map { URL(string: $0) }
.bind(to: signingURLSubject)
.disposed(by: bag)
}
// MARK: - TemplatePreview
func bindShowTemplatePreviewEvent() {
let localPDFObservable = showTemplatePreviewEvent
.map { [weak self] id in
try? self?.fileStorageManager.retrieveData(
Constants.PersistantStores.FileStorage.agreementTemplate + id,
from: .documents
)
}
.do(onError: { error in
Log.e(error)
})
.catchAndReturn(nil)
.share()
localPDFObservable
.unwrap()
.map { PDFDocument(data: $0) }
.bind(to: templatePDFSubject)
.disposed(by: bag)
localPDFObservable
.nilOnly()
.withLatestFrom(showTemplatePreviewEvent.asObservable(), resultSelector: { ($1) })
.filter { $0.isNotEmpty }
.flatMap { [weak self] id -> Observable<Bool> in
guard let self = self else { return Observable.empty() }
return self.docuSignService.loadTemplatePDF(
allocationRequest: id
)
}
.do { error in
Log.e(error)
}
.catchAndReturn(false)
.trueOnly()
.withLatestFrom(showTemplatePreviewEvent.asObservable(), resultSelector: { ($1) })
.map { [weak self] id in
try? self?.fileStorageManager.retrieveData(
Constants.PersistantStores.FileStorage.agreementTemplate + id,
from: .documents
)
}
.unwrap()
.map { PDFDocument(data: $0) }
.bind(to: templatePDFSubject)
.disposed(by: bag)
}
// MARK: - ShareTemplate
func bindShareTemplateEvent() {
let localPDFDataObservable = loadTemplateForSharingEvent
.do(onNext: { [weak self] _ in
self?.isWorkingSubject.onNext(true)
})
.map { [weak self] _ in
try? self?.fileStorageManager.retrieveData(
Constants.PersistantStores.FileStorage.agreementTemplate,
from: .documents
)
}
.do(onError: { error in
Log.e(error)
})
.catchAndReturn(nil)
.share()
localPDFDataObservable
.unwrap()
.bind(to: templateToShareDataSubject)
.disposed(by: bag)
localPDFDataObservable
.unwrap()
.map { _ in false }
.bind(to: isWorkingSubject)
.disposed(by: bag)
localPDFDataObservable
.nilOnly()
.withLatestFrom(showTemplatePreviewEvent.asObservable(), resultSelector: { ($1) })
.filter { $0.isNotEmpty }
.flatMap { [weak self] id -> Observable<Bool> in
guard let self = self else { return Observable.empty() }
return self.docuSignService.loadTemplatePDF(
allocationRequest: id
)
}
.do { error in
Log.e(error)
}
.catchAndReturn(false)
.withLatestFrom(showTemplatePreviewEvent.asObservable(), resultSelector: { ($1) })
.map { [weak self] id in
try? self?.fileStorageManager.retrieveData(
Constants.PersistantStores.FileStorage.agreementTemplate + id,
from: .documents
)
}
.bind(to: templateToShareDataSubject)
.disposed(by: bag)
}
}