enable cors

docs-web-common/src/main/java/com/sismics/util/filter/CorsFilter.java

@@ -0,0 +1,47 @@
+package com.sismics.util.filter;
+
+import com.sismics.util.EnvironmentUtil;
+
+import javax.servlet.*;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+/**
+ * Filter used to handle CORS requests.
+ *
+ * @author bgamard
+ */
+public class CorsFilter implements Filter {
+    @Override
+    public void init(FilterConfig filterConfig) {
+        // NOP
+    }
+
+    @Override
+    public void doFilter(ServletRequest req, ServletResponse res, FilterChain filterChain) throws IOException, ServletException {
+        HttpServletRequest request = (HttpServletRequest) req;
+        HttpServletResponse response = (HttpServletResponse) res;
+
+        if (EnvironmentUtil.isDevMode() && request.getHeader("origin") != null) {
+            // Add CORS in dev mode
+            response.addHeader("Access-Control-Allow-Origin", request.getHeader("origin"));
+            response.addHeader("Access-Control-Allow-Credentials", "true");
+            response.addHeader("Access-Control-Max-Age", "3600");
+            response.addHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization");
+            response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");
+        }
+
+        if ("OPTIONS".equals(request.getMethod())) {
+            // Handle preflight request
+            response.getWriter().print("{ \"status\": \"ok\" }");
+        } else {
+            filterChain.doFilter(req, res);
+        }
+    }
+
+    @Override
+    public void destroy() {
+        // NOP
+    }
+}

docs-web-common/src/main/java/com/sismics/util/filter/RequestContextFilter.java

@@ -32,7 +32,7 @@ public class RequestContextFilter implements Filter {
     private static final Logger log = LoggerFactory.getLogger(RequestContextFilter.class);
 
     @Override
-    public void init(FilterConfig filterConfig) throws ServletException {
+    public void init(FilterConfig filterConfig) {
         // Initialize the app directory
         if (!filterConfig.getServletContext().getServerInfo().startsWith("Grizzly")) {
             EnvironmentUtil.setWebappContext(true);