Enable GUI headers also through reaper configuration

README.md

@@ -8,6 +8,9 @@ Current version supports running Cassandra cluster repairs in segmented manner,
 opportunistically running multiple parallel repairs at the same time on different nodes
 within the cluster. Basic repair scheduling functionality is also supported.
 
+Cassandra Reaper does not come with a GUI, but please check 
+[this project](https://github.com/spodkowinski/cassandra-reaper-ui) if you'd like to use one.
+
 Please see the [Issues](https://github.com/spotify/cassandra-reaper/issues) section for more
 information on planned development, and known issues.
 
@@ -121,6 +124,10 @@ The Reaper service specific configuration values are:
   Optional setting for giving username and password credentials for the used JMX connections
   in case you are using password based JMX authentication with your Cassandra clusters.
 
+* enableCrossOrigin:
+
+  Optional setting which you can set to be "true", if you wish to enable the CORS headers
+  for running an external GUI application, like [this project](https://github.com/spodkowinski/cassandra-reaper-ui).
 
 Notice that in the *server* section of the configuration, if you want to bind the service
 to all interfaces, use value "0.0.0.0", or just leave the *bindHost* line away completely.

src/main/java/com/spotify/reaper/ReaperApplication.java

@@ -126,10 +126,10 @@ public void run(ReaperApplicationConfiguration config,
       context.jmxConnectionFactory.setJmxPorts(jmxPorts);
     }
 
-    // enable cross-origin requests for testing cassandra-reaper-ui
-    if (System.getProperty("enableCrossOrigin") != null) {
-      final FilterRegistration.Dynamic cors =
-          environment.servlets().addFilter("crossOriginRequests", CrossOriginFilter.class);
+    // Enable cross-origin requests for using external GUI applications.
+    if (config.isEnableCrossOrigin() || System.getProperty("enableCrossOrigin") != null) {
+      final FilterRegistration.Dynamic cors = environment.servlets()
+          .addFilter("crossOriginRequests", CrossOriginFilter.class);
       cors.setInitParameter("allowedOrigins", "*");
       cors.setInitParameter("allowedHeaders", "X-Requested-With,Content-Type,Accept,Origin");
       cors.setInitParameter("allowedMethods", "OPTIONS,GET,PUT,POST,DELETE,HEAD");

src/main/java/com/spotify/reaper/ReaperApplicationConfiguration.java

@@ -55,14 +55,16 @@ public class ReaperApplicationConfiguration extends Configuration {
   @NotEmpty
   private String storageType;
 
+  private String enableCrossOrigin;
+
   @Valid
   @NotNull
   @JsonProperty
   private DataSourceFactory database = new DataSourceFactory();
 
   @JsonProperty
   private Map<String, Integer> jmxPorts;
-  
+
   @JsonProperty
   private JmxCredentials jmxAuth;
 
@@ -103,6 +105,18 @@ public String getStorageType() {
     return storageType;
   }
 
+  public void setEnableCrossOrigin(String enableCrossOrigin) {
+    this.enableCrossOrigin = enableCrossOrigin;
+  }
+
+  public String getEnableCrossOrigin() {
+    return this.enableCrossOrigin;
+  }
+
+  public boolean isEnableCrossOrigin() {
+    return this.enableCrossOrigin != null && this.enableCrossOrigin.equalsIgnoreCase("true");
+  }
+
   public void setStorageType(String storageType) {
     this.storageType = storageType;
   }
@@ -139,21 +153,21 @@ public JmxCredentials getJmxAuth() {
   public void setJmxAuth(JmxCredentials jmxAuth) {
     this.jmxAuth = jmxAuth;
   }
-  
+
   public static class JmxCredentials {
-    
+
     @JsonProperty
     private String username;
     @JsonProperty
     private String password;
-    
+
     public String getUsername() {
       return username;
     }
     public String getPassword() {
       return password;
     }
-    
+
   }
 
 }

src/test/resources/cassandra-reaper.yaml

@@ -17,6 +17,10 @@ hangingRepairTimeoutMins: 30
 # storageType is either "database" or "memory"
 storageType: memory
 
+# Enable HTTP headers to that GUI can work
+# GUI lives at https://github.com/spodkowinski/cassandra-reaper-ui
+enableCrossOrigin: true
+
 # custom jmx port mappings that will be used instead of the default port for specified hosts (optional)
 #jmxPorts:
 #  127.0.0.1: 7100