1 files changed, 102 insertions, 0 deletions
diff --git a/framework/src/onos/web/gui/src/main/java/org/onosproject/ui/impl/MainIndexResource.java b/framework/src/onos/web/gui/src/main/java/org/onosproject/ui/impl/MainIndexResource.java
new file mode 100644
index 00000000..a30c0470
--- /dev/null
+++ b/framework/src/onos/web/gui/src/main/java/org/onosproject/ui/impl/MainIndexResource.java
@@ -0,0 +1,102 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.onosproject.ui.impl;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableList.Builder;
+import org.onlab.osgi.ServiceNotFoundException;
+import org.onosproject.rest.AbstractInjectionResource;
+import org.onosproject.ui.UiExtensionService;
+
+import javax.ws.rs.GET;
+import javax.ws.rs.Path;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.SequenceInputStream;
+
+import static com.google.common.collect.ImmutableList.of;
+import static com.google.common.io.ByteStreams.toByteArray;
+
+/**
+ * Resource for serving the dynamically composed index.html.
+ */
+@Path("/")
+public class MainIndexResource extends AbstractInjectionResource {
+
+    private static final String INDEX = "index.html";
+    private static final String NOT_READY = "not-ready.html";
+
+    private static final String INJECT_CSS_START = "<!-- {INJECTED-STYLESHEETS-START} -->";
+    private static final String INJECT_CSS_END = "<!-- {INJECTED-STYLESHEETS-END} -->";
+
+    private static final String INJECT_JS_START = "<!-- {INJECTED-JAVASCRIPT-START} -->";
+    private static final String INJECT_JS_END = "<!-- {INJECTED-JAVASCRIPT-END} -->";
+
+    @GET
+    @Produces(MediaType.TEXT_HTML)
+    public Response getMainIndex() throws IOException {
+        ClassLoader classLoader = getClass().getClassLoader();
+        UiExtensionService service;
+        try {
+            service = get(UiExtensionService.class);
+        } catch (ServiceNotFoundException e) {
+            return Response.ok(classLoader.getResourceAsStream(NOT_READY)).build();
+        }
+
+        InputStream indexTemplate = classLoader.getResourceAsStream(INDEX);
+        String index = new String(toByteArray(indexTemplate));
+
+        int p1s = split(index, 0, INJECT_JS_START);
+        int p1e = split(index, p1s, INJECT_JS_END);
+        int p2s = split(index, p1e, INJECT_CSS_START);
+        int p2e = split(index, p2s, INJECT_CSS_END);
+        int p3s = split(index, p2e, null);
+
+        StreamEnumeration streams =
+                new StreamEnumeration(of(stream(index, 0, p1s),
+                                         includeJs(service),
+                                         stream(index, p1e, p2s),
+                                         includeCss(service),
+                                         stream(index, p2e, p3s)));
+
+        return Response.ok(new SequenceInputStream(streams)).build();
+    }
+
+    // Produces an input stream including CSS injections from all extensions.
+    private InputStream includeCss(UiExtensionService service) {
+        Builder<InputStream> builder = ImmutableList.builder();
+        service.getExtensions().forEach(ext -> add(builder, ext.css()));
+        return new SequenceInputStream(new StreamEnumeration(builder.build()));
+    }
+
+    // Produces an input stream including JS injections from all extensions.
+    private InputStream includeJs(UiExtensionService service) {
+        Builder<InputStream> builder = ImmutableList.builder();
+        service.getExtensions().forEach(ext -> add(builder, ext.js()));
+        return new SequenceInputStream(new StreamEnumeration(builder.build()));
+    }
+
+    // Safely adds the stream to the list builder only if stream is not null.
+    private void add(Builder<InputStream> builder, InputStream inputStream) {
+        if (inputStream != null) {
+            builder.add(inputStream);
+        }
+    }
+
+}