Swift 自定义Useragent

Swift 自定义Useragent

背景

最近在接阿里云的WAF，防火墙会拦截某些请求。被拦截的请求是看不到Headers信息的，只能看到Useragent，所以，应后台需求，自定义Useragent，这样可以更方便从服务器日志定位问题。

准备

当前项目中使用的是Alamofire进行网络请求。 通过查看源码发现，默认的SessionManager是初始化完成的，不能修改。

open static let `default`: SessionManager = {
    let configuration = URLSessionConfiguration.default
    configuration.httpAdditionalHeaders = SessionManager.defaultHTTPHeaders

    return SessionManager(configuration: configuration)
}()

默认SessionManager 的Useragent也是不可修改的，如下：

open static let defaultHTTPHeaders: HTTPHeaders = {

    let acceptEncoding: String = "gzip;q=1.0, compress;q=0.5"

    let acceptLanguage = Locale.preferredLanguages.prefix(6).enumerated().map { index, languageCode in
        let quality = 1.0 - (Double(index) * 0.1)
        return "(languageCode);q=(quality)"
    }.joined(separator: ", ")

    let userAgent: String = {
        if let info = Bundle.main.infoDictionary {
            let executable = info[kCFBundleExecutableKey as String] as? String ?? "Unknown"
            let bundle = info[kCFBundleIdentifierKey as String] as? String ?? "Unknown"
            let appVersion = info["CFBundleShortVersionString"] as? String ?? "Unknown"
            let appBuild = info[kCFBundleVersionKey as String] as? String ?? "Unknown"

            let osNameVersion: String = {
                let version = ProcessInfo.processInfo.operatingSystemVersion
                let versionString = "(version.majorVersion).(version.minorVersion).(version.patchVersion)"

                let osName: String = {
                    #if os(iOS)
                        return "iOS"
                    #elseif os(watchOS)
                        return "watchOS"
                    #elseif os(tvOS)
                        return "tvOS"
                    #elseif os(macOS)
                        return "OS X"
                    #elseif os(Linux)
                        return "Linux"
                    #else
                        return "Unknown"
                    #endif
                }()

                return "(osName) (versionString)"
            }()

            let alamofireVersion: String = {
                guard
                    let afInfo = Bundle(for: SessionManager.self).infoDictionary,
                    let build = afInfo["CFBundleShortVersionString"]
                else { return "Unknown" }

                return "Alamofire/(build)"
            }()

            return "(executable)/(appVersion) ((bundle); build:(appBuild); (osNameVersion)) (alamofireVersion)"
        }

        return "Alamofire"
    }()

    return [
        "Accept-Encoding": acceptEncoding,
        "Accept-Language": acceptLanguage,
        "User-Agent": userAgent
    ]
}()

但是可以通过自定义的方法重新初始化一个SessionManager。

  public init(
    configuration: URLSessionConfiguration = URLSessionConfiguration.default,
    delegate: SessionDelegate = SessionDelegate(),
    serverTrustPolicyManager: ServerTrustPolicyManager? = nil)
{
    self.delegate = delegate
    self.session = URLSession(configuration: configuration, delegate: delegate, delegateQueue: nil)

    commonInit(serverTrustPolicyManager: serverTrustPolicyManager)
}

下面是我的初始化方法：

class  MYSessionManager {

open static let `default`: SessionManager = {
    let bhUserAgent = "device:xx;version:xx;bundleId:xx;"
    var bhHttpHeaders = SessionManager.defaultHTTPHeaders
    bhHttpHeaders["User-Agent"] = bhUserAgent

    let configuration = URLSessionConfiguration.default
    configuration.httpAdditionalHeaders = bhHttpHeaders

    return SessionManager(configuration: configuration)
    }()
}