Кросс-платформенное шифрование фото/аватаров, профиль собеседника, вложения в чате

Rosetta/Features/Chats/ChatDetail/PendingAttachment.swift

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+import UIKit
+
+// MARK: - PendingAttachment
+
+/// Represents an attachment selected by the user but not yet sent.
+/// Used in the attachment preview strip above the compositor.
+///
+/// Desktop parity: the `attachments` state array in `DialogInput.tsx` before
+/// `prepareAttachmentsToSend()` processes and uploads them.
+struct PendingAttachment: Identifiable, Sendable {
+
+    /// Random 8-character alphanumeric ID (matches desktop's `generateRandomKey(8)`).
+    let id: String
+
+    /// Attachment type — `.image` or `.file` for user-initiated sends.
+    let type: AttachmentType
+
+    /// Raw image/file data (pre-compression for images).
+    let data: Data
+
+    /// Thumbnail for preview (images only). `nil` for files.
+    let thumbnail: UIImage?
+
+    /// Original file name (files only). `nil` for images.
+    let fileName: String?
+
+    /// File size in bytes (files only). `nil` for images.
+    let fileSize: Int?
+
+    // MARK: - Factory
+
+    /// Creates a PendingAttachment from a UIImage (compressed to JPEG).
+    static func fromImage(_ image: UIImage) -> PendingAttachment {
+        let id = generateRandomId()
+        // Resize to max 1280px on longest side for mobile optimization
+        let resized = resizeImage(image, maxDimension: 1280)
+        let data = resized.jpegData(compressionQuality: 0.8) ?? Data()
+        let thumbnail = resizeImage(image, maxDimension: 200)
+
+        return PendingAttachment(
+            id: id,
+            type: .image,
+            data: data,
+            thumbnail: thumbnail,
+            fileName: nil,
+            fileSize: nil
+        )
+    }
+
+    /// Creates a PendingAttachment from file data + metadata.
+    static func fromFile(data: Data, fileName: String) -> PendingAttachment {
+        return PendingAttachment(
+            id: generateRandomId(),
+            type: .file,
+            data: data,
+            thumbnail: nil,
+            fileName: fileName,
+            fileSize: data.count
+        )
+    }
+
+    // MARK: - Helpers
+
+    /// Generates a random 8-character ID (desktop: `generateRandomKey(8)`).
+    private static func generateRandomId() -> String {
+        let chars = "abcdefghijklmnopqrstuvwxyz0123456789"
+        return String((0..<8).map { _ in chars.randomElement()! })
+    }
+
+    /// Resizes image so longest side is at most `maxDimension`.
+    private static func resizeImage(_ image: UIImage, maxDimension: CGFloat) -> UIImage {
+        let size = image.size
+        let maxSide = max(size.width, size.height)
+        guard maxSide > maxDimension else { return image }
+
+        let scale = maxDimension / maxSide
+        let newSize = CGSize(width: size.width * scale, height: size.height * scale)
+
+        let renderer = UIGraphicsImageRenderer(size: newSize)
+        return renderer.image { _ in
+            image.draw(in: CGRect(origin: .zero, size: newSize))
+        }
+    }
+}
+
+// MARK: - Constants
+
+extension PendingAttachment {
+    /// Desktop parity: `MAX_ATTACHMENTS_IN_MESSAGE = 5`.
+    static let maxAttachmentsPerMessage = 5
+}