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3ec9e603df
* feat(ActionExtension): Improve "Open in Mastodon" by using Search aPI * Add code comment
163 lines
5.7 KiB
Swift
163 lines
5.7 KiB
Swift
//
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// ActionRequestHandler.swift
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// OpenInActionExtension
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//
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// Created by Marcus Kida on 03.01.23.
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//
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import Combine
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import UIKit
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import MobileCoreServices
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import UniformTypeIdentifiers
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import MastodonCore
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import MastodonSDK
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import MastodonLocalization
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class ActionRequestHandler: NSObject, NSExtensionRequestHandling {
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var extensionContext: NSExtensionContext?
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var cancellables = [AnyCancellable]()
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/// Capturing a static shared instance of AppContext here as otherwise there
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/// will be lifecycle issues and we don't want to keep multiple AppContexts around
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/// in case there another Action Extension process is spawned
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private static let appContext = AppContext()
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func beginRequest(with context: NSExtensionContext) {
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// Do not call super in an Action extension with no user interface
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self.extensionContext = context
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let itemProvider = context.inputItems
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.compactMap({ $0 as? NSExtensionItem })
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.reduce([NSItemProvider](), { partialResult, acc in
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var nextResult = partialResult
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nextResult += acc.attachments ?? []
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return nextResult
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})
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.filter({ $0.hasItemConformingToTypeIdentifier(UTType.propertyList.identifier) })
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.first
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guard let itemProvider = itemProvider else {
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return doneWithInvalidLink()
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}
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itemProvider.loadItem(forTypeIdentifier: UTType.propertyList.identifier, options: nil, completionHandler: { [weak self] item, error in
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DispatchQueue.main.async {
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guard
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let dictionary = item as? NSDictionary,
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let results = dictionary[NSExtensionJavaScriptPreprocessingResultsKey] as? NSDictionary
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else {
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self?.doneWithInvalidLink()
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return
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}
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if let url = results["url"] as? String {
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self?.performSearch(for: url)
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} else {
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self?.doneWithInvalidLink()
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}
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}
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})
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}
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}
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// Search API
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private extension ActionRequestHandler {
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func performSearch(for url: String) {
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guard
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let activeAuthenticationBox = Self.appContext
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.authenticationService
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.mastodonAuthenticationBoxes
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.first
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else {
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return doneWithResults(nil)
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}
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Mastodon.API
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.V2
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.Search
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.search(
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session: .shared,
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domain: activeAuthenticationBox.domain,
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query: .init(q: url, resolve: true),
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authorization: activeAuthenticationBox.userAuthorization
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)
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.receive(on: DispatchQueue.main)
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.sink { completion in
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// no-op
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} receiveValue: { [weak self] result in
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let value = result.value
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if let foundAccount = value.accounts.first {
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self?.doneWithResults([
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"openURL": "mastodon://profile/\(foundAccount.acct)"
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])
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} else if let foundStatus = value.statuses.first {
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self?.doneWithResults([
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"openURL": "mastodon://status/\(foundStatus.id)"
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])
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} else if let foundHashtag = value.hashtags.first {
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self?.continueWithSearch(foundHashtag.name)
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} else {
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self?.continueWithSearch(url)
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}
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}
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.store(in: &cancellables)
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}
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}
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// Fallback to In-App Search
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private extension ActionRequestHandler {
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func continueWithSearch(_ query: String) {
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guard
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let url = URL(string: query),
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let host = url.host
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else {
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return doneWithInvalidLink()
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}
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Mastodon.API
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.Instance
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.instance(
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session: .shared,
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domain: host
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)
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.receive(on: DispatchQueue.main)
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.sink { _ in
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// no-op
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} receiveValue: { [weak self] response in
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guard response.value.version != nil else {
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self?.doneWithInvalidLink()
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return
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}
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guard let query = query.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) else {
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self?.doneWithInvalidLink()
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return
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}
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self?.doneWithResults(
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["openURL": "mastodon://search?query=\(query)"]
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)
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}
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.store(in: &cancellables)
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}
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}
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// Action response handling
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private extension ActionRequestHandler {
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func doneWithInvalidLink() {
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doneWithResults(["alert": L10n.Extension.OpenIn.invalidLinkError])
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}
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func doneWithResults(_ resultsForJavaScriptFinalizeArg: [String: Any]?) {
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if let resultsForJavaScriptFinalize = resultsForJavaScriptFinalizeArg {
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let resultsDictionary = [NSExtensionJavaScriptFinalizeArgumentKey: resultsForJavaScriptFinalize]
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let resultsProvider = NSItemProvider(item: resultsDictionary as NSDictionary, typeIdentifier: UTType.propertyList.identifier)
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let resultsItem = NSExtensionItem()
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resultsItem.attachments = [resultsProvider]
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self.extensionContext!.completeRequest(returningItems: [resultsItem], completionHandler: nil)
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} else {
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self.extensionContext!.completeRequest(returningItems: [], completionHandler: nil)
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}
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self.extensionContext = nil
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}
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}
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