Creation of a Moya provider with SSL pinning

AlamofireSessionManagerBuilder.swift

// 1 - provider creation
let provider = MoyaProvider<MyRouter>(
    manager: AlamofireSessionManagerBuilder().build()
)

// 2 - session manager builder
class AlamofireSessionManagerBuilder {
    
    var policies: [String: ServerTrustPolicy]?
    var configuration = URLSessionConfiguration.default
    
    // 3 - builder initializer
    init(includeSSLPinning: Bool = true) {
        if includeSSLPinning {
            let allPublicKeys = ServerTrustPolicy.pinPublicKeys(
                publicKeys: ServerTrustPolicy.publicKeys(),
                validateCertificateChain: true,
                validateHost: true
            )
            
            self.policies = [
                "firstsubdomain.mycompany.com": allPublicKeys,
                "secondsubdomain.mycompany.com": allPublicKeys
            ]
        }
    }
    
    //4 - Example function that configures alamofire's session manager
    //to increase timeout interval, useful for upload requests.
    func prepareForFileUpload() -> Self {
        configuration.timeoutIntervalForRequest = 300
        configuration.timeoutIntervalForResource = 300
        return self
    }
    
    // 5 - session manager creator
    func build() -> Manager {
        var serverTrustPolicyManager: ServerTrustPolicyManager?
        if let policies = self.policies { serverTrustPolicyManager = ServerTrustPolicyManager(policies: policies) }
        
        let manager = Manager(configuration: configuration,
                              serverTrustPolicyManager: serverTrustPolicyManager)
        manager.startRequestsImmediately = false
        
        return manager
    }
}