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import UIKit
import UniformTypeIdentifiers
/// Receives a web URL from the share sheet, extracts its host, and hands it to
/// the app through the App Group inbox. Shows a brief confirmation and closes;
/// the app picks up the domain the next time it becomes active.
final class ShareViewController: UIViewController {
private let label = UILabel()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .systemBackground
label.text = "Saving…"
label.font = .preferredFont(forTextStyle: .headline)
label.textAlignment = .center
label.numberOfLines = 0
label.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(label)
NSLayoutConstraint.activate([
label.centerXAnchor.constraint(equalTo: view.centerXAnchor),
label.centerYAnchor.constraint(equalTo: view.centerYAnchor),
label.leadingAnchor.constraint(greaterThanOrEqualTo: view.leadingAnchor, constant: 24),
label.trailingAnchor.constraint(lessThanOrEqualTo: view.trailingAnchor, constant: -24)
])
// Task inherits this view controller's MainActor context, so finish()
// lands back on main without a manual dispatch. The continuation form
// also avoids sending a non-Sendable completion into loadItem's
// @Sendable handler. (#27)
Task { [weak self] in
let domain = await self?.extractSharedDomain()
self?.finish(domain: domain ?? nil)
}
}
private func extractSharedDomain() async -> String? {
let providers = (extensionContext?.inputItems ?? [])
.compactMap { $0 as? NSExtensionItem }
.flatMap { $0.attachments ?? [] }
guard let provider = providers.first(where: {
$0.hasItemConformingToTypeIdentifier(UTType.url.identifier)
}) else {
return nil
}
return await withCheckedContinuation { continuation in
provider.loadItem(forTypeIdentifier: UTType.url.identifier) { item, _ in
let url = item as? URL ?? (item as? Data).flatMap { URL(dataRepresentation: $0, relativeTo: nil) }
let host = url?.host?.trimmingCharacters(in: .whitespacesAndNewlines)
continuation.resume(returning: host?.isEmpty == false ? host : nil)
}
}
}
private func finish(domain: String?) {
if let domain {
DomainDigShareInbox.write(domain: domain)
label.text = "Saved \(domain) — open DomainDig to inspect it."
} else {
label.text = "No web address found."
}
DispatchQueue.main.asyncAfter(deadline: .now() + 1.4) { [weak self] in
self?.extensionContext?.completeRequest(returningItems: nil)
}
}
}
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