Add SSLConfig object to IceServer.

This is a rollforward of https://webrtc-review.googlesource.com/c/src/+/96020,
with the addition of setting the old tlsCertPolicy, tlsAlpnProtocols and
tlsEllipticCurves in the RTCIceServer initializer, for backwards compatibility.

Bug: webrtc:9662
Change-Id: I28706ed4ff5abe3f7f913f105779f0e5412aeac5
Reviewed-on: https://webrtc-review.googlesource.com/98762
Commit-Queue: Diogo Real <diogor@google.com>
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Qingsi Wang <qingsi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24696}
diff --git a/sdk/objc/api/peerconnection/RTCIceServer.mm b/sdk/objc/api/peerconnection/RTCIceServer.mm
index 2138e4c..d03fd81 100644
--- a/sdk/objc/api/peerconnection/RTCIceServer.mm
+++ b/sdk/objc/api/peerconnection/RTCIceServer.mm
@@ -9,6 +9,7 @@
  */
 
 #import "RTCIceServer+Private.h"
+#import "RTCSSLConfig+Native.h"
 
 #import "helpers/NSString+StdString.h"
 
@@ -21,6 +22,7 @@
 @synthesize hostname = _hostname;
 @synthesize tlsAlpnProtocols = _tlsAlpnProtocols;
 @synthesize tlsEllipticCurves = _tlsEllipticCurves;
+@synthesize sslConfig = _sslConfig;
 
 - (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings {
   return [self initWithURLStrings:urlStrings
@@ -83,28 +85,50 @@
                           hostname:(NSString *)hostname
                   tlsAlpnProtocols:(NSArray<NSString *> *)tlsAlpnProtocols
                  tlsEllipticCurves:(NSArray<NSString *> *)tlsEllipticCurves {
+  RTCSSLConfig *sslConfig = [[RTCSSLConfig alloc] init];
+  sslConfig.tlsCertPolicy = tlsCertPolicy;
+  sslConfig.tlsALPNProtocols = [[NSArray alloc] initWithArray:tlsAlpnProtocols copyItems:YES];
+  sslConfig.tlsEllipticCurves = [[NSArray alloc] initWithArray:tlsEllipticCurves copyItems:YES];
+  return [self initWithURLStrings:urlStrings
+                         username:username
+                       credential:credential
+                         hostname:hostname
+                        sslConfig:sslConfig];
+}
+
+- (instancetype)initWithURLStrings:(NSArray<NSString *> *)urlStrings
+                          username:(NSString *)username
+                        credential:(NSString *)credential
+                          hostname:(NSString *)hostname
+                         sslConfig:(RTCSSLConfig *)sslConfig {
   NSParameterAssert(urlStrings.count);
   if (self = [super init]) {
     _urlStrings = [[NSArray alloc] initWithArray:urlStrings copyItems:YES];
     _username = [username copy];
     _credential = [credential copy];
-    _tlsCertPolicy = tlsCertPolicy;
     _hostname = [hostname copy];
-    _tlsAlpnProtocols = [[NSArray alloc] initWithArray:tlsAlpnProtocols copyItems:YES];
-    _tlsEllipticCurves = [[NSArray alloc] initWithArray:tlsEllipticCurves copyItems:YES];
+    _sslConfig = sslConfig;
+
+    // TODO(diogor, webrtc:9673): Remove these duplicate assignments.
+    _tlsCertPolicy = sslConfig.tlsCertPolicy;
+    if (sslConfig.tlsALPNProtocols) {
+      _tlsAlpnProtocols = [[NSArray alloc] initWithArray:sslConfig.tlsALPNProtocols copyItems:YES];
+    }
+    if (sslConfig.tlsEllipticCurves) {
+      _tlsEllipticCurves =
+          [[NSArray alloc] initWithArray:sslConfig.tlsEllipticCurves copyItems:YES];
+    }
   }
   return self;
 }
 
 - (NSString *)description {
-  return [NSString stringWithFormat:@"RTCIceServer:\n%@\n%@\n%@\n%@\n%@\n%@\n%@",
+  return [NSString stringWithFormat:@"RTCIceServer:\n%@\n%@\n%@\n%@\n%@",
                                     _urlStrings,
                                     _username,
                                     _credential,
-                                    [self stringForTlsCertPolicy:_tlsCertPolicy],
                                     _hostname,
-                                    _tlsAlpnProtocols,
-                                    _tlsEllipticCurves];
+                                    _sslConfig];
 }
 
 #pragma mark - Private
@@ -149,6 +173,8 @@
           webrtc::PeerConnectionInterface::kTlsCertPolicyInsecureNoCheck;
       break;
   }
+
+  iceServer.ssl_config = [_sslConfig nativeConfig];
   return iceServer;
 }
 
@@ -162,34 +188,38 @@
   NSString *username = [NSString stringForStdString:nativeServer.username];
   NSString *credential = [NSString stringForStdString:nativeServer.password];
   NSString *hostname = [NSString stringForStdString:nativeServer.hostname];
-  NSMutableArray *tlsAlpnProtocols =
-      [NSMutableArray arrayWithCapacity:nativeServer.tls_alpn_protocols.size()];
-  for (auto const &proto : nativeServer.tls_alpn_protocols) {
-    [tlsAlpnProtocols addObject:[NSString stringForStdString:proto]];
-  }
-  NSMutableArray *tlsEllipticCurves =
-      [NSMutableArray arrayWithCapacity:nativeServer.tls_elliptic_curves.size()];
-  for (auto const &curve : nativeServer.tls_elliptic_curves) {
-    [tlsEllipticCurves addObject:[NSString stringForStdString:curve]];
-  }
-  RTCTlsCertPolicy tlsCertPolicy;
+  RTCSSLConfig *sslConfig = [[RTCSSLConfig alloc] initWithNativeConfig:nativeServer.ssl_config];
 
-  switch (nativeServer.tls_cert_policy) {
-    case webrtc::PeerConnectionInterface::kTlsCertPolicySecure:
-      tlsCertPolicy = RTCTlsCertPolicySecure;
-      break;
-    case webrtc::PeerConnectionInterface::kTlsCertPolicyInsecureNoCheck:
-      tlsCertPolicy = RTCTlsCertPolicyInsecureNoCheck;
-      break;
+  if (!nativeServer.ssl_config.tls_alpn_protocols.has_value() &&
+      !nativeServer.tls_alpn_protocols.empty()) {
+    NSMutableArray *tlsALPNProtocols =
+        [NSMutableArray arrayWithCapacity:nativeServer.tls_alpn_protocols.size()];
+    for (auto const &proto : nativeServer.tls_alpn_protocols) {
+      [tlsALPNProtocols addObject:[NSString stringForStdString:proto]];
+    }
+    sslConfig.tlsALPNProtocols = tlsALPNProtocols;
+  }
+
+  if (!nativeServer.ssl_config.tls_elliptic_curves.has_value() &&
+      !nativeServer.tls_elliptic_curves.empty()) {
+    NSMutableArray *tlsEllipticCurves =
+        [NSMutableArray arrayWithCapacity:nativeServer.tls_elliptic_curves.size()];
+    for (auto const &curve : nativeServer.tls_elliptic_curves) {
+      [tlsEllipticCurves addObject:[NSString stringForStdString:curve]];
+    }
+    sslConfig.tlsEllipticCurves = tlsEllipticCurves;
+  }
+
+  if (nativeServer.tls_cert_policy ==
+      webrtc::PeerConnectionInterface::kTlsCertPolicyInsecureNoCheck) {
+    sslConfig.tlsCertPolicy = RTCTlsCertPolicyInsecureNoCheck;
   }
 
   self = [self initWithURLStrings:urls
                          username:username
                        credential:credential
-                    tlsCertPolicy:tlsCertPolicy
                          hostname:hostname
-                 tlsAlpnProtocols:tlsAlpnProtocols
-                tlsEllipticCurves:tlsEllipticCurves];
+                        sslConfig:sslConfig];
   return self;
 }