Properly handle static assets for announcements (#891)

data/GameAnnouncement.json

 {
+  "t": "{{SYSTEM_TIME}}",
   "list": [
     {
       "ann_id": 1,
       "title": "<strong>Welcome to Grasscutter!</strong>",
       "subtitle": "Welcome!",
-      "banner": "https://uploadstatic-sea.mihoyo.com/announcement/2020/09/17/f4aa42d505822805eebf4a55d72a78d8_2755691727027973637.jpg",
+      "banner": "{{DISPATCH_PUBLIC}}/hk4e/announcement/assets/banner/1.jpg",
       "content": "<p>Hi there!</p><p>First of all, welcome to Grasscutter. If you have any issues, please let us know so that Lawnmower can help you!</p><br><p><strong>〓Discord〓</strong></p><a href=\"https://discord.gg/T5vZU6UyeG\">https://discord.gg/T5vZU6UyeG</a><br><br><p><strong>〓GitHub〓</strong><a href=\"https://github.com/Grasscutters/Grasscutter\">https://github.com/Grasscutters/Grasscutter</a>",
-
       "lang": "en-US"
     },
     {
       "ann_id": 2,
       "title": "<strong>How to use announcements</strong>",
       "subtitle": "How to use announcements",
-      "banner": "https://uploadstatic-sea.mihoyo.com/announcement/2020/09/17/f4aa42d505822805eebf4a55d72a78d8_2755691727027973637.jpg",
+      "banner": "{{DISPATCH_PUBLIC}}/hk4e/announcement/assets/banner/2.jpg",
       "content": "<p>Announcement content uses HTML. The specific content of the announcement is stored in the program directory <code>GameAnnouncement.json</code>, while <code>GameAnnouncementList.json</code> stores the announcement list data.</p><h2><code>GameAnnouncement</code></h2><table><tr><th>Parameter</th><th>Description</th></tr><tr><td>ann_id</td><td>Unique ID</td></tr><tr><td>title</td><td>Title shown at the top of the content</td></tr><tr><td>subtitle</td><td>Short title shown on the left</td></tr><tr><td>banner</td><td>Image to display between content and title</td></tr><tr><td>content</td><td>Content body in HTML</td></tr><tr><td>lang</td><td>Language code for this entry</td></tr></table><h2><code>GameAnnouncementList</code></h2><p>If you want to add an announcement, please add the list data in the announcement type corresponding to <code>GameAnnouncementList</code>, and finally add the announcement content in <code>GameAnnouncement</code>.</p>",
       "lang": "en-US"
     }

data/GameAnnouncementList.json

 {
-  "t": "System.currentTimeMillis()",
+  "t": "{{SYSTEM_TIME}}",
   "list": [
     {
       "list": [
         {
           "ann_id": 1,
-
           "title": "<strong>Welcome to Grasscutter!</strong>",
           "subtitle": "Welcome!",
-          "banner": "https://uploadstatic-sea.mihoyo.com/announcement/2020/09/22/7d85f19b152d218e73224d7c138a0fd0_5818585260283672899.jpg",
-          "tag_icon": "https://uploadstatic-sea.mihoyo.com/announcement/2020/03/05/a2588f1a51faee9fa8dfe9aead649dd6_7237021399135895303.png",
+          "banner": "{{DISPATCH_PUBLIC}}/hk4e/announcement/assets/banner/1.jpg",
+          "tag_icon": "{{DISPATCH_PUBLIC}}/hk4e/announcement/assets/tag_icon.png",
           "type": 2,
           "type_label": "System",
           "lang": "en-US",
@@ -22,8 +21,8 @@
           "ann_id": 2,
           "title": "<strong>How to use announcements</strong>",
           "subtitle": "How to use announcements",
-          "banner": "https://uploadstatic-sea.mihoyo.com/announcement/2020/09/22/7d85f19b152d218e73224d7c138a0fd0_5818585260283672899.jpg",
-          "tag_icon": "https://uploadstatic-sea.mihoyo.com/announcement/2020/03/05/a2588f1a51faee9fa8dfe9aead649dd6_7237021399135895303.png",
+          "banner": "{{DISPATCH_PUBLIC}}/hk4e/announcement/assets/banner/2.jpg",
+          "tag_icon": "{{DISPATCH_PUBLIC}}/hk4e/announcement/assets/tag_icon.png",
           "type": 2,
           "type_label": "System",
           "lang": "en-US",
@@ -59,11 +58,5 @@
   ],
   "timezone": -5,
   "alert": false,
-  "alert_id": 0,
-  "pic_list": [],
-  "pic_total": 0,
-  "pic_type_list": [],
-  "pic_alert": false,
-  "pic_alert_id": 0,
-  "static_sign": ""
+  "alert_id": 0
 }
\ No newline at end of file

src/main/java/emu/grasscutter/server/http/handlers/AnnouncementsHandler.java

@@ -6,6 +6,7 @@ import emu.grasscutter.server.http.Router;
 import emu.grasscutter.utils.FileUtils;
 import emu.grasscutter.utils.Utils;
 import express.Express;
+import express.http.MediaType;
 import express.http.Request;
 import express.http.Response;
 import io.javalin.Javalin;
@@ -13,27 +14,15 @@ import io.javalin.Javalin;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
-import java.nio.file.Paths;
+import java.nio.charset.StandardCharsets;
 import java.util.Objects;
 
-import static emu.grasscutter.Configuration.DATA;
+import static emu.grasscutter.Configuration.*;
 
 /**
  * Handles requests related to the announcements page.
  */
 public final class AnnouncementsHandler implements Router {
-    private static String template, swjs, vue;
-    
-    public AnnouncementsHandler() {
-        var templateFile = new File(Utils.toFilePath(DATA("/hk4e/announcement/index.html")));
-        var swjsFile = new File(Utils.toFilePath(DATA("/hk4e/announcement/sw.js")));
-        var vueFile = new File(Utils.toFilePath(DATA("/hk4e/announcement/vue.min.js")));
-        
-        template = templateFile.exists() ? new String(FileUtils.read(template)) : null;
-        swjs = swjsFile.exists() ? new String(FileUtils.read(swjs)) : null;
-        vue = vueFile.exists() ? new String(FileUtils.read(vueFile)) : null;
-    }
-    
     @Override public void applyRoutes(Express express, Javalin handle) {
         // hk4e-api-os.hoyoverse.com
         express.all("/common/hk4e_global/announcement/api/getAlertPic", new HttpJsonResponse("{\"retcode\":0,\"message\":\"OK\",\"data\":{\"total\":0,\"list\":[]}}"));
@@ -47,58 +36,57 @@ public final class AnnouncementsHandler implements Router {
         express.all("/hk4e_global/mdk/shopwindow/shopwindow/listPriceTier", new HttpJsonResponse("{\"retcode\":0,\"message\":\"OK\",\"data\":{\"suggest_currency\":\"USD\",\"tiers\":[]}}"));
 
         express.get("/hk4e/announcement/*", AnnouncementsHandler::getPageResources);
-        express.get("/sw.js", AnnouncementsHandler::getPageResources);
-        express.get("/dora/lib/vue/2.6.11/vue.min.js", AnnouncementsHandler::getPageResources);
     }
     
     private static void getAnnouncement(Request request, Response response) {
+        String data = "";
         if (Objects.equals(request.baseUrl(), "/common/hk4e_global/announcement/api/getAnnContent")) {
-            String data = readToString(Paths.get(DATA("GameAnnouncement.json")).toFile());
-            response.send("{\"retcode\":0,\"message\":\"OK\",\"data\":" + data + "}");
+            data = readToString(new File(Utils.toFilePath(DATA("GameAnnouncement.json"))));
         } else if (Objects.equals(request.baseUrl(), "/common/hk4e_global/announcement/api/getAnnList")) {
-            String data = readToString(Paths.get(DATA("GameAnnouncementList.json")).toFile())
-                    .replace("System.currentTimeMillis()", String.valueOf(System.currentTimeMillis()));
-            response.send("{\"retcode\":0,\"message\":\"OK\",\"data\": " + data + "}");
+            data = readToString(new File(Utils.toFilePath(DATA("GameAnnouncementList.json"))));
+        } else {
+            response.send("{\"retcode\":404,\"message\":\"Unknown request path\"}");
         }
+
+        if (data.isEmpty()) {
+            response.send("{\"retcode\":500,\"message\":\"Unable to fetch requsted content\"}");
+            return;
         }
 
-    private static void getPageResources(Request request, Response response) {
-        var path = request.path();
-        switch(path) {
-            case "/sw.js" -> response.send(swjs);
-            case "/hk4e/announcement/index.html" -> response.send(template);
-            case "/dora/lib/vue/2.6.11/vue.min.js" -> response.send(vue);
+        String dispatchDomain = "http" + (HTTP_ENCRYPTION.useInRouting ? "s" : "") + "://"
+                + lr(HTTP_INFO.accessAddress, HTTP_INFO.bindAddress) + ":"
+                + lr(HTTP_INFO.accessPort, HTTP_INFO.bindPort);
 
-            default -> {
-                File renderFile = new File(Utils.toFilePath(DATA(path)));
-                if(!renderFile.exists()) {
-                    Grasscutter.getLogger().info("File not exist: " + path);
-                    return;
+        data = data
+            .replace("{{DISPATCH_PUBLIC}}", dispatchDomain)
+            .replace("{{SYSTEM_TIME}}", String.valueOf(System.currentTimeMillis()));
+        response.send("{\"retcode\":0,\"message\":\"OK\",\"data\": " + data + "}");
     }
     
-                String ext = path.substring(path.lastIndexOf(".") + 1);
-                if ("css".equals(ext)) {
-                    response.type("text/css");
-                    response.send(FileUtils.read(renderFile));
+    private static void getPageResources(Request request, Response response) {
+        String filename = Utils.toFilePath(DATA(request.path()));
+        File file = new File(filename);
+        if (file.exists() && file.isFile()) {
+            MediaType fromExtension = MediaType.getByExtension(filename.substring(filename.lastIndexOf(".") + 1));
+            response.type((fromExtension != null) ? fromExtension.getMIME() : "application/octet-stream");
+            response.send(FileUtils.read(file));
         } else {
-                    response.send(FileUtils.read(renderFile));
-                }
-            }
+            Grasscutter.getLogger().warn("File does not exist: " + file);
+            response.status(404);
         }
     }
 
     @SuppressWarnings("ResultOfMethodCallIgnored")
     private static String readToString(File file) {
-        long length = file.length();
-        byte[] content = new byte[(int) length];
+        byte[] content = new byte[(int) file.length()];
         
         try {
             FileInputStream in = new FileInputStream(file);
             in.read(content); in.close();
         } catch (IOException ignored) {
-            Grasscutter.getLogger().warn("File not found: " + file.getAbsolutePath());
+            Grasscutter.getLogger().warn("File does not exist: " + file);
         }
 
-        return new String(content);
+        return new String(content, StandardCharsets.UTF_8);
     }
 }