FoundationNetworking/URLSessionConfiguration: Add URLCredential

Author: oliviermartin

Sources/FoundationNetworking/URLSession/Configuration.swift

@@ -78,6 +78,9 @@ internal extension URLSession {
         let shouldUseExtendedBackgroundIdleMode: Bool
 
         let protocolClasses: [AnyClass]?
+
+        /// The credentials to use for connecting to servers
+        let clientCredential: URLCredential?
     }
 }
 internal extension URLSession._Configuration {
@@ -100,6 +103,7 @@ internal extension URLSession._Configuration {
         urlCache = config.urlCache
         shouldUseExtendedBackgroundIdleMode = config.shouldUseExtendedBackgroundIdleMode
         protocolClasses = config.protocolClasses
+        clientCredential = config.clientCredential
     }
 }
 

Sources/FoundationNetworking/URLSession/HTTP/HTTPURLProtocol.swift

@@ -328,7 +328,14 @@ internal class _HTTPURLProtocol: _NativeProtocol {
         }
         let session = task?.session as! URLSession
         let _config = session._configuration
-        easyHandle.set(sessionConfig: _config)
+        do {
+            try easyHandle.set(sessionConfig: _config)
+        } catch {
+            self.internalState = .transferFailed
+            let nsError = error as? NSError ?? NSError(domain: NSURLErrorDomain, code: NSURLErrorUserAuthenticationRequired)
+            failWith(error: nsError, request: request)
+            return
+        }
         easyHandle.setAllowedProtocolsToHTTPAndHTTPS()
         easyHandle.set(preferredReceiveBufferSize: Int.max)
         do {

Sources/FoundationNetworking/URLSession/URLSessionConfiguration.swift

@@ -75,9 +75,10 @@ open class URLSessionConfiguration : NSObject, NSCopying {
                   urlCredentialStorage: .shared,
                   urlCache: .shared,
                   shouldUseExtendedBackgroundIdleMode: false,
-                  protocolClasses: [_HTTPURLProtocol.self, _FTPURLProtocol.self, _WebSocketURLProtocol.self])
+                  protocolClasses: [_HTTPURLProtocol.self, _FTPURLProtocol.self, _WebSocketURLProtocol.self],
+                  clientCredential: nil)
     }
-    
+
     private init(identifier: String?,
                  requestCachePolicy: URLRequest.CachePolicy,
                  timeoutIntervalForRequest: TimeInterval,
@@ -95,7 +96,8 @@ open class URLSessionConfiguration : NSObject, NSCopying {
                  urlCredentialStorage: URLCredentialStorage?,
                  urlCache: URLCache?,
                  shouldUseExtendedBackgroundIdleMode: Bool,
-                 protocolClasses: [AnyClass]?)
+                 protocolClasses: [AnyClass]?,
+                 clientCredential: URLCredential?)
     {
         self.identifier = identifier
         self.requestCachePolicy = requestCachePolicy
@@ -115,6 +117,7 @@ open class URLSessionConfiguration : NSObject, NSCopying {
         self.urlCache = urlCache
         self.shouldUseExtendedBackgroundIdleMode = shouldUseExtendedBackgroundIdleMode
         self.protocolClasses = protocolClasses
+        self.clientCredential = clientCredential
     }
 
     open override func copy() -> Any {
@@ -140,7 +143,8 @@ open class URLSessionConfiguration : NSObject, NSCopying {
             urlCredentialStorage: urlCredentialStorage,
             urlCache: urlCache,
             shouldUseExtendedBackgroundIdleMode: shouldUseExtendedBackgroundIdleMode,
-            protocolClasses: protocolClasses)
+            protocolClasses: protocolClasses,
+            clientCredential: clientCredential)
     }
 
     open class var `default`: URLSessionConfiguration {
@@ -258,6 +262,8 @@ open class URLSessionConfiguration : NSObject, NSCopying {
      @available(*, unavailable, message: "Not available on non-Darwin platforms")
      open var multipathServiceType: URLSessionConfiguration.MultipathServiceType { NSUnsupported() }
 
+    /* Optional client credential to be used when connecting to servers */
+    open var clientCredential: URLCredential?
 }
 
 @available(*, unavailable, message: "Not available on non-Darwin platforms")

Sources/FoundationNetworking/URLSession/libcurl/EasyHandle.swift

@@ -178,8 +178,47 @@ extension _EasyHandle {
         }
     }
 
-    func set(sessionConfig config: URLSession._Configuration) {
+    func set(sessionConfig config: URLSession._Configuration) throws {
         _config = config
+        if let c = _config, let clientCredential = c.clientCredential {
+            // For TLS client certificate authentication
+            if var privateClientKey = clientCredential.privateClientKey,
+               var privateClientCertificate = clientCredential.privateClientCertificate {
+                // Key and certificate are expected to be in DER format
+                "DER".withCString {
+                    let mutablePointer = UnsafeMutablePointer(mutating: $0)
+                    try! CFURLSession_easy_setopt_ptr(rawHandle, CFURLSessionOptionSSLKEYTYPE, mutablePointer).asError()
+                    try! CFURLSession_easy_setopt_ptr(rawHandle, CFURLSessionOptionSSLCERTTYPE, mutablePointer).asError()
+                }
+
+                privateClientKey.withUnsafeMutableBytes {
+                    try! CFURLSession_easy_setopt_blob(rawHandle, CFURLSessionOptionSSLKEY_BLOB,
+                        $0.baseAddress, $0.count).asError()
+                }
+
+                privateClientCertificate.withUnsafeMutableBytes {
+                    try! CFURLSession_easy_setopt_blob(rawHandle, CFURLSessionOptionSSLCERT_BLOB,
+                        $0.baseAddress, $0.count).asError()
+                }
+            } else if let tlsAuthUsername = clientCredential.user,
+                      let tlsAuthPassword = clientCredential.password {
+                "SRP".withCString {
+                    let mutablePointer = UnsafeMutablePointer(mutating: $0)
+                    try! CFURLSession_easy_setopt_ptr(rawHandle, CFURLSessionOptionTLSAUTH_TYPE, mutablePointer).asError()
+                }
+                tlsAuthUsername.withCString {
+                    let mutablePointer = UnsafeMutablePointer(mutating: $0)
+                    try! CFURLSession_easy_setopt_ptr(rawHandle, CFURLSessionOptionTLSAUTH_USERNAME, mutablePointer).asError()
+                }
+                tlsAuthPassword.withCString {
+                    let mutablePointer = UnsafeMutablePointer(mutating: $0)
+                    try! CFURLSession_easy_setopt_ptr(rawHandle, CFURLSessionOptionTLSAUTH_PASSWORD, mutablePointer).asError()
+                }
+            } else {
+                throw NSError(domain: NSURLErrorDomain, code: NSURLErrorUserAuthenticationRequired,
+                              userInfo: [NSLocalizedDescriptionKey: "Client credentials from URLSessionConfiguration is incomplete."])
+            }
+        }
     }
 
     /// Set allowed protocols