Add config for hostname.

src/main/java/io/kamax/mxisd/HttpMxisd.java

@@ -23,6 +23,7 @@ package io.kamax.mxisd;
 import io.kamax.mxisd.config.MatrixConfig;
 import io.kamax.mxisd.config.MxisdConfig;
 import io.kamax.mxisd.config.PolicyConfig;
+import io.kamax.mxisd.config.ServerConfig;
 import io.kamax.mxisd.http.undertow.handler.ApiHandler;
 import io.kamax.mxisd.http.undertow.handler.AuthorizationHandler;
 import io.kamax.mxisd.http.undertow.handler.CheckTermsHandler;
@@ -145,7 +146,8 @@ public class HttpMxisd {
         termsEndpoints(handler);
         hashEndpoints(handler);
         accountEndpoints(handler);
-        httpSrv = Undertow.builder().addHttpListener(m.getConfig().getServer().getPort(), "0.0.0.0").setHandler(handler).build();
+        ServerConfig serverConfig = m.getConfig().getServer();
+        httpSrv = Undertow.builder().addHttpListener(serverConfig.getPort(), serverConfig.getHostname()).setHandler(handler).build();
 
         httpSrv.start();
     }

src/main/java/io/kamax/mxisd/config/ServerConfig.java

@@ -34,6 +34,7 @@ public class ServerConfig {
     private String name;
     private int port = 8090;
     private String publicUrl;
+    private String hostname;
 
     public String getName() {
         return name;
@@ -59,6 +60,14 @@ public class ServerConfig {
         this.publicUrl = publicUrl;
     }
 
+    public String getHostname() {
+        return hostname;
+    }
+
+    public void setHostname(String hostname) {
+        this.hostname = hostname;
+    }
+
     public void build() {
         log.info("--- Server config ---");
 
@@ -75,8 +84,13 @@ public class ServerConfig {
             log.warn("Public URL is not valid: {}", StringUtils.defaultIfBlank(e.getMessage(), "<no reason provided>"));
         }
 
+        if (StringUtils.isBlank(getHostname())) {
+            setHostname("0.0.0.0");
+        }
+
         log.info("Name: {}", getName());
         log.info("Port: {}", getPort());
         log.info("Public URL: {}", getPublicUrl());
+        log.info("Hostname: {}", getHostname());
     }
 }