3.x

Committed-by: Eduard Heimbuch<eduard.heimbuch@cloudogu.com>
Pushed-by: Rene Pfeuffer<rene.pfeuffer@cloudogu.com>
Co-authored-by: René Pfeuffer<rene.pfeuffer@cloudogu.com>
Pushed-by: Eduard Heimbuch<eduard.heimbuch@cloudogu.com>
Committed-by: René Pfeuffer<rene.pfeuffer@cloudogu.com>

scm-webapp/src/main/java/sonia/scm/plugin/ConfigurationResolver.java

@@ -0,0 +1,113 @@
+/*
+ * 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.plugin;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.io.Resources;
+import sonia.scm.config.WebappConfigProvider;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Optional;
+
+public class ConfigurationResolver {
+
+  private static final String PREFIX = "SCM_WEBAPP_";
+
+  private final JsonNode rootNode;
+
+  private final Map<String, String> environment;
+
+  public ConfigurationResolver() {
+    this(System.getenv(), "config.yml");
+  }
+
+  @VisibleForTesting
+  ConfigurationResolver(Map<String, String> environment, String configPath) {
+    this.environment = environment;
+    URL resource = Resources.getResource(configPath);
+    try {
+      rootNode = new ObjectMapper(new YAMLFactory()).readTree(resource).get("webapp");
+      WebappConfigProvider.setConfigBindings(readConfigurationFile(rootNode));
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  private Map<String, String> readConfigurationFile(JsonNode rootNode) {
+    return readConfigurationFile(rootNode, "");
+  }
+
+  private Map<String, String> readConfigurationFile(JsonNode rootNode, String prefix) {
+    Map<String, String> configurationFile = new HashMap<>();
+    rootNode.fields().forEachRemaining(entry -> {
+      if (entry.getValue().isValueNode()) {
+        configurationFile.put(prefix + entry.getKey(), entry.getValue().asText());
+      } else {
+        configurationFile.putAll(readConfigurationFile(entry.getValue(), prefix + entry.getKey() + "."));
+      }
+    });
+    return configurationFile;
+  }
+
+  public String resolve(String key, String defaultValue) {
+    Optional<String> value = resolveFromEnv(key);
+    if (value.isEmpty()) {
+      value = resolveFromFile(key);
+    }
+    return value.orElse(defaultValue);
+  }
+
+  private Optional<String> resolveFromFile(String key) {
+    String[] keyFragments = key.split("\\.");
+    JsonNode node = rootNode;
+    for (String fragment : keyFragments) {
+      if (node.has(fragment)) {
+        node = node.get(fragment);
+      } else {
+        return Optional.empty();
+      }
+    }
+
+    return Optional.of(node.asText());
+  }
+
+  private Optional<String> resolveFromEnv(String key) {
+    String envKey = createEnvKey(key);
+    String envVariable = environment.get(envKey);
+
+    return Optional.ofNullable(envVariable);
+  }
+
+  private String createEnvKey(String key) {
+    return PREFIX + key.toUpperCase(Locale.ENGLISH).replaceAll("\\.-/", "_");
+  }
+}