Enable extension in development mode only

README.md

@@ -1,6 +1,6 @@
 # Quarkus Config Extension
 
-Adds a servlet to a [Quarkus](https://quarkus.io) application which lists the configured values for [MicroProfile Configuration](https://microprofile.io/project/eclipse/microprofile-config). The servlet is registered using the path `/config` by default and lists all properties of all config sources. The config sources are sorted descending by ordinal, the properties by name. If no config is defined an empty JSON object is returned. 
+Adds a servlet to a [Quarkus](https://quarkus.io) application running in dev mode which lists the configured values for [MicroProfile Configuration](https://microprofile.io/project/eclipse/microprofile-config). The servlet is registered using the path `/config` by default and lists all properties of all config sources. The config sources are sorted descending by ordinal, the properties by name. If no config is defined an empty JSON object is returned. 
 
 A typical output might look like:
 ```json
@@ -44,3 +44,5 @@ To use the extension in your Quarkus app, add the following dependency to your p
     <scope>provided</scope>
 </dependency>
 ```
+
+Please note that the extension is only available in development mode by default. To use it in normal mode as well set `quarkus.config.dev-mode-only = false` in your configuration. 

deployment/src/main/java/io/quarkus/config/deployment/ConfigProcessor.java

@@ -15,14 +15,14 @@
  */
 package io.quarkus.config.deployment;
 
-import static java.util.Arrays.asList;
-
-import java.util.List;
+import java.util.logging.Logger;
 
 import io.quarkus.arc.deployment.AdditionalBeanBuildItem;
 import io.quarkus.config.runtime.ConfigServlet;
+import io.quarkus.deployment.annotations.BuildProducer;
 import io.quarkus.deployment.annotations.BuildStep;
 import io.quarkus.deployment.builditem.FeatureBuildItem;
+import io.quarkus.deployment.builditem.LaunchModeBuildItem;
 import io.quarkus.runtime.annotations.ConfigItem;
 import io.quarkus.runtime.annotations.ConfigRoot;
 import io.quarkus.undertow.deployment.ServletBuildItem;
@@ -32,37 +32,57 @@
  *
  * @author Harald Pehl
  */
-class ConfigProcessor {
+public class ConfigProcessor {
+
+    private static final Logger log = Logger.getLogger("io.quarkus.config");
 
     /**
      * The configuration for config extension.
      */
     ConfigConfig config;
 
+
     @ConfigRoot(name = "config")
     static final class ConfigConfig {
+
         /**
          * The path of the config servlet.
          */
         @ConfigItem(defaultValue = "/config")
         String path;
-    }
 
-    @BuildStep
-    ServletBuildItem produceServlet() {
-        ServletBuildItem servletBuildItem = ServletBuildItem.builder("config", ConfigServlet.class.getName())
-                .addMapping(config.path)
-                .build();
-        return servletBuildItem;
+        /**
+         * Whether the servlet is configured in dev mode only.
+         */
+        @ConfigItem(defaultValue = "true")
+        boolean devModeOnly;
     }
 
     @BuildStep
-    List<AdditionalBeanBuildItem> additionalBeans() {
-        return asList(new AdditionalBeanBuildItem(ConfigServlet.class));
-    }
+    public void build(LaunchModeBuildItem launchMode,
+            BuildProducer<AdditionalBeanBuildItem> beans,
+            BuildProducer<ServletBuildItem> servlets,
+            BuildProducer<FeatureBuildItem> feature) {
 
-    @BuildStep
-    FeatureBuildItem feature() {
-        return new FeatureBuildItem("config");
+        boolean useExtension;
+        if (launchMode.getLaunchMode().isDevOrTest()) {
+            useExtension = true;
+        } else {
+            useExtension = !config.devModeOnly;
+            if (useExtension) {
+                log.warning("Config extension was enabled in normal mode! " +
+                        "All configuration will be visible at the /" + config.path + " endpoint. " +
+                        "If that's not what you want, remove 'quarkus.config.dev-mode-only = false' " +
+                        "from your configuration.");
+            }
+        }
+
+        if (useExtension) {
+            beans.produce(new AdditionalBeanBuildItem(ConfigServlet.class));
+            servlets.produce(ServletBuildItem.builder("config", ConfigServlet.class.getName())
+                    .addMapping(config.path)
+                    .build());
+            feature.produce(new FeatureBuildItem("config"));
+        }
     }
 }