Refactor dispatch (now called HTTP) server (pt. 2)

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

@@ -0,0 +1,71 @@
+package emu.grasscutter.server.http.handlers;
+
+import emu.grasscutter.Grasscutter;
+import emu.grasscutter.database.DatabaseHelper;
+import emu.grasscutter.server.http.Router;
+import emu.grasscutter.tools.Tools;
+import emu.grasscutter.utils.FileUtils;
+import emu.grasscutter.utils.Utils;
+import express.Express;
+import express.http.Request;
+import express.http.Response;
+import io.javalin.Javalin;
+import io.javalin.http.staticfiles.Location;
+
+import java.io.File;
+
+import static emu.grasscutter.Configuration.DATA;
+
+/**
+ * Handles all gacha-related HTTP requests.
+ */
+public final class GachaHandler implements Router {
+    private final String gachaMappings;
+    
+    private static String frontendTemplate = "{{REPLACE_RECORD}}";
+    
+    public GachaHandler() {
+        this.gachaMappings = Utils.toFilePath(DATA("/gacha_mappings.js"));
+        if(!(new File(this.gachaMappings).exists())) {
+            try {
+                Tools.createGachaMapping(this.gachaMappings);
+            } catch (Exception exception) {
+                Grasscutter.getLogger().warn("Failed to create gacha mappings.", exception);
+            }
+        }
+        
+        var templateFile = new File(DATA("/gacha_records.html"));
+        if(templateFile.exists())
+            frontendTemplate = new String(FileUtils.read(templateFile));
+    }
+    
+    @Override public void applyRoutes(Express express, Javalin handle) {
+        express.get("/gacha", GachaHandler::gachaRecords);
+        
+        express.useStaticFallback("/gacha/mappings", this.gachaMappings, Location.EXTERNAL);
+    }
+    
+    private static void gachaRecords(Request request, Response response) {
+        var sessionKey = request.query("s");
+        
+        int page = 0, gachaType = 0;
+        if(request.query("p") != null)
+            page = Integer.parseInt(request.query("p"));
+        if(request.query("gachaType") != null)
+            gachaType = Integer.parseInt(request.query("gachaType"));
+        
+        // Get account from session key.
+        var account = DatabaseHelper.getAccountBySessionKey(sessionKey);
+        
+        if(account == null) // Send response.
+            response.status(404).send("Unable to find account.");
+        else {
+            String records = DatabaseHelper.getGachaRecords(account.getPlayerUid(), gachaType, page).toString();
+            long maxPage = DatabaseHelper.getGachaRecordsMaxPage(account.getPlayerUid(), page, gachaType);
+            
+            response.send(frontendTemplate
+                    .replace("{{REPLACE_RECORD}}", records)
+                    .replace("{{REPLACE_MAXPAGE}}", String.valueOf(maxPage)));
+        }
+    }
+}