Add testSelfSignedCertificateIsRejectedWithCorrectError

Package.swift

@@ -61,6 +61,10 @@ let package = Package(
                 .product(name: "NIOHTTP2", package: "swift-nio-http2"),
                 .product(name: "NIOSOCKS", package: "swift-nio-extras"),
                 .product(name: "Logging", package: "swift-log"),
+            ],
+            resources: [
+                .copy("Resources/self_signed_cert.pem"),
+                .copy("Resources/self_signed_key.pem"),
             ]
         ),
     ]

Sources/AsyncHTTPClient/NIOTransportServices/NWErrorHandler.swift

@@ -60,7 +60,7 @@ extension HTTPClient {
     }
     #endif
 
-    class NWErrorHandler: ChannelInboundHandler {
+    final class NWErrorHandler: ChannelInboundHandler {
         typealias InboundIn = HTTPClientResponsePart
 
         func errorCaught(context: ChannelHandlerContext, error: Error) {
@@ -73,9 +73,9 @@ extension HTTPClient {
                 if let error = error as? NWError {
                     switch error {
                     case .tls(let status):
-                        return NWTLSError(status, reason: error.localizedDescription)
+                        return NWTLSError(status, reason: String(describing: error))
                     case .posix(let errorCode):
-                        return NWPOSIXError(errorCode, reason: error.localizedDescription)
+                        return NWPOSIXError(errorCode, reason: String(describing: error))
                     default:
                         return error
                     }

Tests/AsyncHTTPClientTests/HTTPClientTests+XCTest.swift

@@ -78,6 +78,7 @@ extension HTTPClientTests {
             ("testSubsequentRequestsWorkWithServerAlternatingBetweenKeepAliveAndClose", testSubsequentRequestsWorkWithServerAlternatingBetweenKeepAliveAndClose),
             ("testStressGetHttps", testStressGetHttps),
             ("testStressGetHttpsSSLError", testStressGetHttpsSSLError),
+            ("testSelfSignedCertificateIsRejectedWithCorrectError", testSelfSignedCertificateIsRejectedWithCorrectError),
             ("testFailingConnectionIsReleased", testFailingConnectionIsReleased),
             ("testResponseDelayGet", testResponseDelayGet),
             ("testIdleTimeoutNoReuse", testIdleTimeoutNoReuse),

Tests/AsyncHTTPClientTests/HTTPClientTests.swift

@@ -1229,6 +1229,46 @@ class HTTPClientTests: XCTestCase {
         }
     }
 
+    func testSelfSignedCertificateIsRejectedWithCorrectError() throws {
+        /// key + cert was created with the follwing command:
+        /// openssl req -x509 -newkey rsa:4096 -keyout self_signed_key.pem -out self_signed_cert.pem -sha256 -days 99999 -nodes -subj '/CN=localhost'
+        let certPath = Bundle.module.path(forResource: "self_signed_cert", ofType: "pem")!
+        let keyPath = Bundle.module.path(forResource: "self_signed_key", ofType: "pem")!
+        let configuration = TLSConfiguration.makeServerConfiguration(
+            certificateChain: try NIOSSLCertificate.fromPEMFile(certPath).map { .certificate($0) },
+            privateKey: .file(keyPath)
+        )
+        let sslContext = try NIOSSLContext(configuration: configuration)
+
+        let server = ServerBootstrap(group: serverGroup)
+            .childChannelInitializer { channel in
+                channel.pipeline.addHandler(NIOSSLServerHandler(context: sslContext))
+            }
+        let serverChannel = try server.bind(host: "localhost", port: 0).wait()
+        defer { XCTAssertNoThrow(try serverChannel.close().wait()) }
+        let port = serverChannel.localAddress!.port!
+
+        var config = HTTPClient.Configuration()
+        config.timeout.connect = .seconds(2)
+        let localClient = HTTPClient(eventLoopGroupProvider: .shared(self.clientGroup), configuration: config)
+        defer { XCTAssertNoThrow(try localClient.syncShutdown()) }
+        XCTAssertThrowsError(try localClient.get(url: "https://localhost:\(port)").wait()) { error in
+            #if canImport(Network)
+            guard let nwTLSError = error as? HTTPClient.NWTLSError else {
+                XCTFail("could not cast \(error) of type \(type(of: error)) to \(HTTPClient.NWTLSError.self)")
+                return
+            }
+            XCTAssertEqual(nwTLSError.status, errSSLBadCert, "unexpected tls error: \(nwTLSError)")
+            #else
+            guard let sslError = error as? NIOSSLError,
+                  case .handshakeFailed(.sslError) = sslError else {
+                XCTFail("unexpected error \(error)")
+                return
+            }
+            #endif
+        }
+    }
+
     func testFailingConnectionIsReleased() {
         let localHTTPBin = HTTPBin(.refuse)
         let localClient = HTTPClient(eventLoopGroupProvider: .shared(self.clientGroup))

Tests/AsyncHTTPClientTests/HTTPConnectionPool+HTTP2StateMachineTests.swift

@@ -1242,7 +1242,7 @@ func XCTAssertEqualTypeAndValue<Left, Right: Equatable>(
         let lhs = try lhs()
         let rhs = try rhs()
         guard let lhsAsRhs = lhs as? Right else {
-            XCTFail("could not cast \(lhs) of type \(Right.self) to \(Left.self)")
+            XCTFail("could not cast \(lhs) of type \(type(of: lhs)) to \(type(of: rhs))")
             return
         }
         XCTAssertEqual(lhsAsRhs, rhs)

Tests/AsyncHTTPClientTests/Resources/self_signed_cert.pem

@@ -0,0 +1,27 @@
+-----BEGIN CERTIFICATE-----
+MIIEpjCCAo4CCQCeTmfiTQcJrzANBgkqhkiG9w0BAQsFADAUMRIwEAYDVQQDDAls
+b2NhbGhvc3QwIBcNMjIwNjE0MTI1NDQ4WhgPMjI5NjAzMjgxMjU0NDhaMBQxEjAQ
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+zqGOP1yGxVcKxu6t8Xh0hL6JPFmKWiMEWVrd1wut6NAIu6WNftmWZX6J
+-----END CERTIFICATE-----

Tests/AsyncHTTPClientTests/Resources/self_signed_key.pem

@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
+MIIJQgIBADANBgkqhkiG9w0BAQEFAASCCSwwggkoAgEAAoICAQCteoDw8D/122n9
++seQTXeshw8QjyCCT+CS3zBLqM8CxNGEasJmTrpJW+I1GwF3+7vbtuADawuF0ulV
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+-----END PRIVATE KEY-----