linphone-iphone/linphoneExtension/ShareViewController.swift

/*
 * Copyright (c) 2010-2024 Belledonne Communications SARL.
 *
 * This file is part of linphone-iphone
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

import UIKit
import Social

class ShareViewController: SLComposeServiceViewController {
	
	var remainingSlots = 12

	override func isContentValid() -> Bool {
		return true
	}

	override func viewDidAppear(_ animated: Bool) {
		handleSharedFiles()
	}

	override func configurationItems() -> [Any]! {
		return []
	}

	private func handleSharedFiles() {
		guard let extensionItems = self.extensionContext?.inputItems as? [NSExtensionItem] else { return }
		
		var fileURLs: [URL] = []
		let dispatchGroup = DispatchGroup()

		for item in extensionItems {
			if let attachments = item.attachments {
                for provider in attachments {
                    guard remainingSlots > 0 else { break }
                    if provider.hasItemConformingToTypeIdentifier("public.item") {
                        remainingSlots -= 1
                        dispatchGroup.enter()
                        provider.loadItem(forTypeIdentifier: "public.item", options: nil) { item, error in
                            if let url = item as? URL, let saved = self.copyFileToSharedContainer(from: url) {
                                fileURLs.append(saved)
                            } else if let image = item as? UIImage,
                                      let data = image.pngData(),
                                      let saved = self.saveDataToSharedContainer(data: data) {
                                fileURLs.append(saved)
                            }
                            dispatchGroup.leave()
                        }
                    }
                }
            }
        }

		dispatchGroup.notify(queue: .main) {
			if !fileURLs.isEmpty {
				self.openParentApp(with: fileURLs)
			} else {
				self.extensionContext?.completeRequest(returningItems: [], completionHandler: nil)
			}
		}
	}

	func openParentApp(with fileURLs: [URL]) {
		let urlStrings = fileURLs.map { $0.path }
		let joinedURLs = urlStrings.joined(separator: ",")

		let urlScheme = "linphone-message://\(joinedURLs)"
		if let url = URL(string: urlScheme) {
			var responder: UIResponder? = self
			while responder != nil {
				if let application = responder as? UIApplication {
					application.open(url)
					break
				}
				responder = responder?.next
			}
		}
		
		self.extensionContext?.completeRequest(returningItems: [], completionHandler: nil)
	}
	
    func copyFileToSharedContainer(from url: URL) -> URL? {
        guard let sharedContainerURL = FileManager.default.containerURL(
            forSecurityApplicationGroupIdentifier: "group.org.linphone.phone.linphoneExtension"
        ) else { return nil }

        let destinationURL = sharedContainerURL.appendingPathComponent(url.lastPathComponent)

        do {
            if FileManager.default.fileExists(atPath: destinationURL.path) {
                try FileManager.default.removeItem(at: destinationURL)
            }
            try FileManager.default.copyItem(at: url, to: destinationURL)
            
            let attrs = try FileManager.default.attributesOfItem(atPath: destinationURL.path)
            if let size = attrs[.size] as? NSNumber, size.intValue > 0 {
                return destinationURL
            } else {
                try? FileManager.default.removeItem(at: destinationURL)
                return nil
            }
        } catch {
            return nil
        }
    }

    func saveDataToSharedContainer(data: Data, suggestedName: String = "screenshot") -> URL? {
        guard let sharedContainerURL = FileManager.default.containerURL(
            forSecurityApplicationGroupIdentifier: "group.org.linphone.phone.linphoneExtension"
        ) else { return nil }

        let randomInt = Int.random(in: 1000...9999)
        let destinationURL = sharedContainerURL.appendingPathComponent("\(suggestedName)_\(randomInt).png")

        do {
            try data.write(to: destinationURL)
            return destinationURL
        } catch {
            return nil
        }
    }
}