0.10.6

Sources/Shared/Services/AvatarImageProcessor.swift

@@ -0,0 +1,49 @@
+import Foundation
+import ImageIO
+import UniformTypeIdentifiers
+
+enum AvatarImageProcessor {
+    static func pngData(from sourceData: Data) throws -> Data {
+        guard let source = CGImageSourceCreateWithData(sourceData as CFData, nil),
+              let image = CGImageSourceCreateThumbnailAtIndex(
+                source,
+                0,
+                [
+                    kCGImageSourceCreateThumbnailFromImageAlways: true,
+                    kCGImageSourceCreateThumbnailWithTransform: true,
+                    kCGImageSourceThumbnailMaxPixelSize: 512
+                ] as CFDictionary
+              ) else {
+            throw AvatarImageError.invalidImage
+        }
+
+        let output = NSMutableData()
+        guard let destination = CGImageDestinationCreateWithData(
+            output,
+            UTType.png.identifier as CFString,
+            1,
+            nil
+        ) else {
+            throw AvatarImageError.encodingFailed
+        }
+        CGImageDestinationAddImage(destination, image, nil)
+        guard CGImageDestinationFinalize(destination) else {
+            throw AvatarImageError.encodingFailed
+        }
+        return output as Data
+    }
+}
+
+private enum AvatarImageError: LocalizedError {
+    case invalidImage
+    case encodingFailed
+
+    var errorDescription: String? {
+        switch self {
+        case .invalidImage:
+            return "Не удалось прочитать выбранное изображение."
+        case .encodingFailed:
+            return "Не удалось подготовить аватар в формате PNG."
+        }
+    }
+}