Add external sticker set import

submodules/ImportStickerPackUI/Sources/ImportStickerPack.swift

@@ -0,0 +1,49 @@
+import Foundation
+import UIKit
+
+public class ImportStickerPack {
+    public class Sticker: Equatable {
+        public static func == (lhs: ImportStickerPack.Sticker, rhs: ImportStickerPack.Sticker) -> Bool {
+            return lhs.uuid == rhs.uuid
+        }
+        
+        let image: UIImage
+        let emojis: [String]
+        let uuid: UUID
+        
+        init(image: UIImage, emojis: [String], uuid: UUID = UUID()) {
+            self.image = image
+            self.emojis = emojis
+            self.uuid = uuid
+        }
+    }
+    
+    public var identifier: String
+    public var name: String
+    public let software: String
+    public var thumbnail: String?
+    public let isAnimated: Bool
+    
+    public var stickers: [Sticker]
+    
+    public init?(data: Data) {
+        guard let json = try? JSONSerialization.jsonObject(with: data, options: []) as? [String: Any] else {
+            return nil
+        }
+        
+        self.name = json["name"] as? String ?? ""
+        self.identifier = json["identifier"] as? String ?? ""
+        self.software = json["software"] as? String ?? ""
+        self.isAnimated = json["isAnimated"] as? Bool ?? false
+        
+        var stickers: [Sticker] = []
+        if let stickersArray = json["stickers"] as? [[String: Any]] {
+            for sticker in stickersArray {
+                if let dataString = sticker["data"] as? String, let data = Data(base64Encoded: dataString), let image = UIImage(data: data) {
+                    stickers.append(Sticker(image: image, emojis: sticker["emojis"] as? [String] ?? []))
+                }
+            }
+        }
+        self.stickers = stickers
+    }
+}