rgoers commented on a change in pull request #253: Log4 j2 913 - Add support 
for HTTP/S configuration monitoring. Support Spring Cloud Config
URL: https://github.com/apache/logging-log4j2/pull/253#discussion_r253349792
 
 

 ##########
 File path: 
log4j-spring-cloud-config/log4j-spring-cloud-config-server/src/main/java/org/apache/logging/log4j/spring/cloud/config/server/controller/Log4jResourceController.java
 ##########
 @@ -0,0 +1,200 @@
+/*
+ * Copyright 2015-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.logging.log4j.spring.cloud.config.server.controller;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.Charset;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.cloud.config.environment.Environment;
+import 
org.springframework.cloud.config.server.environment.EnvironmentRepository;
+import 
org.springframework.cloud.config.server.resource.NoSuchResourceException;
+import org.springframework.cloud.config.server.resource.ResourceRepository;
+import org.springframework.core.io.Resource;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.util.StreamUtils;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.context.request.ServletWebRequest;
+import org.springframework.web.util.UrlPathHelper;
+
+import static 
org.springframework.cloud.config.server.support.EnvironmentPropertySource.prepareEnvironment;
+import static 
org.springframework.cloud.config.server.support.EnvironmentPropertySource.resolvePlaceholders;
+
+/**
+ * Modified version of Spring Cloud Config's ResourceController to support 
If-Modified-Since.
+ * Should be dropeed when Spring implements this.
+ *
+ * An HTTP endpoint for serving up templated plain text resources from an 
underlying
+ * repository. Can be used to supply config files for consumption by a wide 
variety of
+ * applications and services. A {@link ResourceRepository} is used to locate a
+ * {@link Resource}, specific to an application, and the contents are 
transformed to text.
+ * Then an {@link EnvironmentRepository} is used to supply key-value pairs 
which are used
+ * to replace placeholders in the resource text.
+ *
+ * @author Dave Syer
+ * @author Daniel Lavoie
+ *
+ */
+@RestController
+@RequestMapping(method = RequestMethod.GET, path = 
"${spring.cloud.config.server.prefix:}/resource")
+public class Log4jResourceController {
+
+    @Autowired
+       private ResourceRepository resourceRepository;
+
+    @Autowired
+       private EnvironmentRepository environmentRepository;
+
+       private UrlPathHelper helper = new UrlPathHelper();
+
+       public Log4jResourceController(ResourceRepository resourceRepository,
+                       EnvironmentRepository environmentRepository) {
+               this.resourceRepository = resourceRepository;
+               this.environmentRepository = environmentRepository;
+               this.helper.setAlwaysUseFullPath(true);
+       }
+
+       @RequestMapping("/{name}/{profile}/{label}/**")
+       public String retrieve(@PathVariable String name, @PathVariable String 
profile,
+                       @PathVariable String label, ServletWebRequest request,
+            @RequestParam(defaultValue = "true") boolean resolvePlaceholders)
+                       throws IOException {
+               String path = getFilePath(request, name, profile, label);
+               return retrieve(request, name, profile, label, path, 
resolvePlaceholders);
+       }
+
+       @RequestMapping(value = "/{name}/{profile}/**", params = 
"useDefaultLabel")
+       public String retrieve(@PathVariable String name, @PathVariable String 
profile,
+                       ServletWebRequest request, @RequestParam(defaultValue = 
"true") boolean resolvePlaceholders)
+                       throws IOException {
+               String path = getFilePath(request, name, profile, null);
+               return retrieve(request, name, profile, null, path, 
resolvePlaceholders);
+       }
+
+       private String getFilePath(ServletWebRequest request, String name, 
String profile,
+                       String label) {
+               String stem;
+               if(label != null ) {
+                       stem = String.format("/%s/%s/%s/", name, profile, 
label);
+               }else {
+                       stem = String.format("/%s/%s/", name, profile);
+               }
+               String path = 
this.helper.getPathWithinApplication(request.getRequest());
+               path = path.substring(path.indexOf(stem) + stem.length());
+               return path;
+       }
+
+    private synchronized String retrieve(ServletWebRequest request, String 
name, String profile, String label,
+        String path, boolean resolvePlaceholders) throws IOException {
+        name = resolveName(name);
+        label = resolveLabel(label);
+        Resource resource = this.resourceRepository.findOne(name, profile, 
label, path);
+        if (checkNotModified(request, resource)) {
+            // Content was not modified. Just return.
+            return null;
+        }
+        // ensure InputStream will be closed to prevent file locks on Windows
+        try (InputStream is = resource.getInputStream()) {
+            String text = StreamUtils.copyToString(is, 
Charset.forName("UTF-8"));
 
 Review comment:
   Fixed

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