text: /*
   *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
   *
   *  Use of this source code is governed by a BSD-style license
   *  that can be found in the LICENSE file in the root of the source
   *  tree. An additional intellectual property rights grant can be found
   *  in the file PATENTS.  All contributing project authors may
   *  be found in the AUTHORS file in the root of the source tree.
   */
  
  #import <Foundation/Foundation.h>
  
  #import <WebRTC/RTCMacros.h>
  
  typedef NS_ENUM(NSUInteger, RTCTlsCertPolicy) {
    RTCTlsCertPolicySecure,
    RTCTlsCertPolicyInsecureNoCheck
  };
  
  NS_ASSUME_NONNULL_BEGIN
  
  RTC_EXPORT
  @interface RTCIceServer : NSObject
  
  /** URI(s) for this server represented as NSStrings. */
  @property(nonatomic, readonly) NSArray<NSString *> *urlStrings;
  
  /** Username to use if this RTCIceServer object is a TURN server. */
  @property(nonatomic, readonly, nullable) NSString *username;
  
  /** Credential to use if this RTCIceServer object is a TURN server. */
  @property(nonatomic, readonly, nullable) NSString *credential;
  
  /**
   * TLS certificate policy to use if this RTCIceServer object is a TURN server.
   */
  @property(nonatomic, readonly) RTCTlsCertPolicy tlsCertPolicy;
  
  /**
    If the URIs in |urls| only contain IP addresses, this field can be used
    to indicate the hostname, which may be necessary for TLS (using the SNI
    extension). If |urls| itself contains the hostname, this isn't necessary.
   */
  @property(nonatomic, readonly, nullable) NSString *hostname;
  
  /** List of protocols to be used in the TLS ALPN extension. */
  @property(nonatomic, readonly) NSArray<NSString *> *tlsAlpnProtocols;
  
  /**
    List elliptic curves to be used in the TLS elliptic curves extension.
    Only curve names supported by OpenSSL should be used (eg. "P-256","X25519").
    */
  @property(nonatomic, readonly) NSArray<NSString *> *tlsEllipticCurves;
  
  - (nonnull instancetype)init NS_UNAVAILABLE;
  
  /** Convenience initializer for a server with no authentication (e.g. STUN). */
  - (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings;
  
  /**
   * Initialize an RTCIceServer with its associated URLs, optional username,
   * optional credential, and credentialType.
   */
  - (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings
                            username:(nullable NSString *)username
                          credential:(nullable NSString *)credential;
  
  /**
   * Initialize an RTCIceServer with its associated URLs, optional username,
   * optional credential, and TLS cert policy.
   */
  - (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings
                            username:(nullable NSString *)username
                          credential:(nullable NSString *)credential
                       tlsCertPolicy:(RTCTlsCertPolicy)tlsCertPolicy;
  
  /**
   * Initialize an RTCIceServer with its associated URLs, optional username,
   * optional credential, TLS cert policy and hostname.
   */
  - (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings
                            username:(nullable NSString *)username
                          credential:(nullable NSString *)credential
                       tlsCertPolicy:(RTCTlsCertPolicy)tlsCertPolicy
                            hostname:(nullable NSString *)hostname;
  
  /**
   * Initialize an RTCIceServer with its associated URLs, optional username,
   * optional credential, TLS cert policy, hostname and ALPN protocols.
   */
  - (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings
                            username:(nullable NSString *)username
                          credential:(nullable NSString *)credential
                       tlsCertPolicy:(RTCTlsCertPolicy)tlsCertPolicy
                            hostname:(nullable NSString *)hostname
                    tlsAlpnProtocols:(NSArray<NSString *> *)tlsAlpnProtocols;
  
  /**
   * Initialize an RTCIceServer with its associated URLs, optional username,
   * optional credential, TLS cert policy, hostname, ALPN protocols and
   * elliptic curves.
   */
  - (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings
                            username:(nullable NSString *)username
                          credential:(nullable NSString *)credential
                       tlsCertPolicy:(RTCTlsCertPolicy)tlsCertPolicy
                            hostname:(nullable NSString *)hostname
                    tlsAlpnProtocols:(nullable NSArray<NSString *> *)tlsAlpnProtocols
                   tlsEllipticCurves:(nullable NSArray<NSString *> *)tlsEllipticCurves
      NS_DESIGNATED_INITIALIZER;
  
  @end
  
  NS_ASSUME_NONNULL_END
  