Allow request mappings to handle a request based on host (fixes mkopylec#121)

Author: jwgmeligmeyling

charon-spring-webmvc/src/main/java/com/github/mkopylec/charon/configuration/RequestMappingConfiguration.java

@@ -19,6 +19,7 @@
 public class RequestMappingConfiguration implements Valid {
 
     private String name;
+    private Pattern hostRegex;
     private Pattern pathRegex;
     private RestTemplateConfiguration restTemplateConfiguration;
     private List<RequestForwardingInterceptor> requestForwardingInterceptors;
@@ -27,6 +28,7 @@ public class RequestMappingConfiguration implements Valid {
 
     RequestMappingConfiguration(String name) {
         this.name = name;
+        hostRegex = compile(".*");
         pathRegex = compile("/.*");
         requestForwardingInterceptors = new ArrayList<>();
         unsetRequestForwardingInterceptors = new ArrayList<>();
@@ -41,6 +43,14 @@ public String getName() {
         return name;
     }
 
+    public Pattern getHostRegex() {
+        return hostRegex;
+    }
+
+    void setHostRegex(String hostRegex) {
+        this.hostRegex = compile(hostRegex);
+    }
+
     public Pattern getPathRegex() {
         return pathRegex;
     }

charon-spring-webmvc/src/main/java/com/github/mkopylec/charon/configuration/RequestMappingConfigurer.java

@@ -14,6 +14,11 @@ public static RequestMappingConfigurer requestMapping(String name) {
         return new RequestMappingConfigurer(name);
     }
 
+    public RequestMappingConfigurer hostRegex(String hostRegex) {
+        configuredObject.setHostRegex(hostRegex);
+        return this;
+    }
+
     public RequestMappingConfigurer pathRegex(String pathRegex) {
         configuredObject.setPathRegex(pathRegex);
         return this;

charon-spring-webmvc/src/main/java/com/github/mkopylec/charon/forwarding/RequestMappingResolver.java

@@ -23,9 +23,12 @@ class RequestMappingResolver {
     }
 
     RequestMappingConfiguration resolveRequestMapping(HttpServletRequest request) {
+        final String serverName = request.getServerName();
         String requestURI = request.getRequestURI();
         List<RequestMappingConfiguration> configurations = requestMappingConfigurations.stream()
-                .filter(configuration -> configuration.getPathRegex().matcher(requestURI).matches())
+                .filter(configuration ->
+                        configuration.getHostRegex().matcher(serverName).matches() &&
+                        configuration.getPathRegex().matcher(requestURI).matches())
                 .collect(toList());
         if (configurations.isEmpty()) {
             log.debug("No request mapping matches {} incoming request", requestURI);