IceCubesApp/IceCubesActionExtension/ActionRequestHandler.swift

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//
// ActionRequestHandler.swift
// IceCubesActionExtension
//
// Created by Thomas Durand on 26/01/2023.
//
import MobileCoreServices
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import UIKit
import UniformTypeIdentifiers
import Models
import Network
// Sample code was sending this from a thread to another, let asume @Sendable for this
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extension NSExtensionContext: @unchecked Sendable {}
final class ActionRequestHandler: NSObject, NSExtensionRequestHandling, Sendable {
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enum Error: Swift.Error {
case inputProviderNotFound
case loadedItemHasWrongType
case urlNotFound
case noHost
case notMastodonInstance
}
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func beginRequest(with context: NSExtensionContext) {
// Do not call super in an Action extension with no user interface
Task {
do {
let url = try await url(from: context)
guard await url.isMastodonInstance else {
throw Error.notMastodonInstance
}
await MainActor.run {
let deeplink = url.iceCubesAppDeepLink
let output = output(wrapping: deeplink)
context.completeRequest(returningItems: output)
}
} catch {
await MainActor.run {
context.completeRequest(returningItems: [])
}
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}
}
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}
}
extension URL {
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var isMastodonInstance: Bool {
get async {
do {
guard let host = host() else {
throw ActionRequestHandler.Error.noHost
}
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let _: Instance = try await Client(server: host).get(endpoint: Instances.instance)
return true
} catch {
return false
}
}
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}
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var iceCubesAppDeepLink: URL {
var components = URLComponents(url: self, resolvingAgainstBaseURL: false)!
components.scheme = AppInfo.scheme.trimmingCharacters(in: [":", "/"])
return components.url!
}
}
extension ActionRequestHandler {
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/// Will look for an input item that might provide the property list that Javascript sent us
private func url(from context: NSExtensionContext) async throws -> URL {
for item in context.inputItems as! [NSExtensionItem] {
guard let attachments = item.attachments else {
continue
}
for itemProvider in attachments {
guard itemProvider.hasItemConformingToTypeIdentifier(UTType.propertyList.identifier) else {
continue
}
guard let dictionary = try await itemProvider.loadItem(forTypeIdentifier: UTType.propertyList.identifier) as? [String: Any] else {
throw Error.loadedItemHasWrongType
}
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let input = dictionary[NSExtensionJavaScriptPreprocessingResultsKey] as! [String: Any]? ?? [:]
guard let absoluteStringUrl = input["url"] as? String, let url = URL(string: absoluteStringUrl) else {
throw Error.urlNotFound
}
return url
}
}
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throw Error.inputProviderNotFound
}
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/// Wrap the output to the expected object so we send back results to JS
private func output(wrapping deeplink: URL) -> [NSExtensionItem] {
let results = ["deeplink": deeplink.absoluteString]
let dictionary = [NSExtensionJavaScriptFinalizeArgumentKey: results]
let provider = NSItemProvider(item: dictionary as NSDictionary, typeIdentifier: UTType.propertyList.identifier)
let item = NSExtensionItem()
item.attachments = [provider]
return [item]
}
}