Add TrustManagerProvider (#1654)

scm-webapp/src/main/java/sonia/scm/net/TrustManagerProvider.java

@@ -0,0 +1,72 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package sonia.scm.net;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.inject.Inject;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.inject.Named;
+import javax.inject.Provider;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.TrustManagerFactory;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+
+public class TrustManagerProvider implements Provider<TrustManager> {
+
+  private static final Logger LOG = LoggerFactory.getLogger(TrustManagerProvider.class);
+
+  @Named("default")
+  @Inject(optional = true)
+  private Provider<TrustManager> customTrustManagerProvider;
+
+  @VisibleForTesting
+  void setCustomTrustManagerProvider(Provider<TrustManager> customTrustManagerProvider) {
+    this.customTrustManagerProvider = customTrustManagerProvider;
+  }
+
+  @Override
+  public TrustManager get() {
+    if (customTrustManagerProvider != null) {
+      LOG.trace("use custom trust manager from provider");
+      return customTrustManagerProvider.get();
+    } else {
+      LOG.trace("could not find trust manager provider, use jvm default");
+      return createDefaultTrustManager();
+    }
+  }
+  private TrustManager createDefaultTrustManager() {
+    try {
+      TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
+      trustManagerFactory.init((KeyStore) null);
+      return trustManagerFactory.getTrustManagers()[0];
+    } catch (NoSuchAlgorithmException | KeyStoreException ex) {
+      throw new IllegalStateException(ex);
+    }
+  }
+}