feat: 增加媒体格式校验，支持 JPEG、PNG、GIF、MP4、WebM、WebP 格式

README.md

@@ -110,7 +110,7 @@ sdk.deleteFile(key: "file-key") { result in /* ... */ }
 ### 文件传输
 
 ```swift
-// 一步完成：自动 ANI 转换 → prepare → transfer
+// 一步完成：格式校验 → ANI 转换 → prepare → transfer
 sdk.transferMedia(fileUrl: "https://example.com/video.mp4") { result in
     switch result {
     case .success: print("Transfer complete")
@@ -120,6 +120,13 @@ sdk.transferMedia(fileUrl: "https://example.com/video.mp4") { result in
 // 进度通过 delegate didUpdateProgress 回调
 ```
 
+**支持的媒体格式：** JPEG、PNG、GIF、MP4、WebM、WebP
+
+格式校验规则：
+- 优先从 URL path 提取扩展名（自动忽略查询参数）
+- 无扩展名时通过 HEAD 请求检查 `Content-Type`
+- 不支持的格式返回 `DuooomiBleError.unsupportedFormat`
+
 ### 固件升级
 
 ```swift

Sources/DuooomiBleSDK/Core/BleTypes.swift

@@ -35,6 +35,7 @@ public enum DuooomiBleError: LocalizedError {
     case transferFailed(String)
     case invalidFrame
     case permissionDenied
+    case unsupportedFormat(String)
 
     public var errorDescription: String? {
         switch self {
@@ -64,6 +65,8 @@ public enum DuooomiBleError: LocalizedError {
             return "Invalid protocol frame"
         case .permissionDenied:
             return "Bluetooth permission denied"
+        case .unsupportedFormat(let ext):
+            return "Unsupported file format: \(ext). Supported: jpeg, png, gif, mp4, webm, webp"
         }
     }
 }

Sources/DuooomiBleSDK/DuooomiBleSDK.swift

@@ -419,6 +419,57 @@ public final class DuooomiBleSDK: NSObject {
 
     // MARK: - High-Level APIs
 
+    private static let supportedMediaExtensions: Set<String> = [
+        "jpeg", "jpg", "png", "gif", "mp4", "webm", "webp"
+    ]
+
+    private static let supportedMimeTypes: Set<String> = [
+        "image/jpeg", "image/png", "image/gif", "image/webp",
+        "video/mp4", "video/webm"
+    ]
+
+    private func extractExtension(from urlString: String) -> String? {
+        guard let comps = URLComponents(string: urlString) else { return nil }
+        let path = comps.path
+        let ext = (path.lowercased() as NSString).pathExtension
+        guard !ext.isEmpty else { return nil }
+        return ext
+    }
+
+    private func validateMediaFormat(url: String, completion: @escaping (Result<Void, Error>) -> Void) {
+        if let ext = extractExtension(from: url) {
+            if DuooomiBleSDK.supportedMediaExtensions.contains(ext) {
+                completion(.success(()))
+            } else {
+                completion(.failure(DuooomiBleError.unsupportedFormat(ext)))
+            }
+            return
+        }
+
+        guard let requestUrl = URL(string: url) else {
+            completion(.failure(DuooomiBleError.transferFailed("Invalid URL: \(url)")))
+            return
+        }
+        var request = URLRequest(url: requestUrl)
+        request.httpMethod = "HEAD"
+        URLSession.shared.dataTask(with: request) { _, response, error in
+            if let error = error {
+                completion(.failure(DuooomiBleError.transferFailed("Format check failed: \(error.localizedDescription)")))
+                return
+            }
+            guard let mime = (response as? HTTPURLResponse)?.allHeaderFields["Content-Type"] as? String else {
+                completion(.failure(DuooomiBleError.unsupportedFormat("unknown")))
+                return
+            }
+            let baseMime = mime.components(separatedBy: ";").first?.trimmingCharacters(in: .whitespaces).lowercased() ?? ""
+            if DuooomiBleSDK.supportedMimeTypes.contains(baseMime) {
+                completion(.success(()))
+            } else {
+                completion(.failure(DuooomiBleError.unsupportedFormat(baseMime)))
+            }
+        }.resume()
+    }
+
     /// 传输媒体文件到设备（一步完成）
     public func transferMedia(fileUrl: String, completion: @escaping (Result<Void, Error>) -> Void) {
         guard connectedDevice != nil else {
@@ -437,14 +488,21 @@ public final class DuooomiBleSDK: NSObject {
             BleLog.i("Direct ANI transfer: \(url)", "Transfer")
             transferMediaStep2(aniUrl: url, originalUrl: url, completion: completion)
         } else {
-            BleLog.i("Converting to ANI: \(url)", "Transfer")
-            aniConverter.convert(fileUrl: url) { [weak self] result in
+            validateMediaFormat(url: url) { [weak self] result in
                 switch result {
                 case .failure(let error):
-                    completion(.failure(DuooomiBleError.transferFailed("ANI conversion failed: \(error.localizedDescription)")))
-                case .success(let aniUrl):
-                    BleLog.i("ANI ready: \(aniUrl)", "Transfer")
-                    self?.transferMediaStep2(aniUrl: aniUrl, originalUrl: url, completion: completion)
+                    completion(.failure(error))
+                case .success:
+                    BleLog.i("Converting to ANI: \(url)", "Transfer")
+                    self?.aniConverter.convert(fileUrl: url) { [weak self] result in
+                        switch result {
+                        case .failure(let error):
+                            completion(.failure(DuooomiBleError.transferFailed("ANI conversion failed: \(error.localizedDescription)")))
+                        case .success(let aniUrl):
+                            BleLog.i("ANI ready: \(aniUrl)", "Transfer")
+                            self?.transferMediaStep2(aniUrl: aniUrl, originalUrl: url, completion: completion)
+                        }
+                    }
                 }
             }
         }