mobile download

backend/src/main/java/com/goldenchart/controller/MobileAppReleaseController.java

@@ -0,0 +1,43 @@
+package com.goldenchart.controller;
+
+import com.goldenchart.dto.MobileAppReleaseInfoDto;
+import com.goldenchart.service.MobileAppReleaseService;
+import jakarta.servlet.http.HttpServletRequest;
+import lombok.RequiredArgsConstructor;
+import org.springframework.core.io.Resource;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/mobile-app")
+@RequiredArgsConstructor
+public class MobileAppReleaseController {
+
+    private final MobileAppReleaseService releaseService;
+
+    @GetMapping("/info")
+    public MobileAppReleaseInfoDto info(HttpServletRequest request) {
+        return releaseService.getInfo(resolvePublicBaseUrl(request));
+    }
+
+    @GetMapping("/download/android")
+    public ResponseEntity<Resource> downloadAndroid() {
+        return releaseService.downloadAndroid();
+    }
+
+    private static String resolvePublicBaseUrl(HttpServletRequest request) {
+        String forwardedProto = request.getHeader("X-Forwarded-Proto");
+        String forwardedHost = request.getHeader("X-Forwarded-Host");
+        if (forwardedHost != null && !forwardedHost.isBlank()) {
+            String scheme = forwardedProto != null && !forwardedProto.isBlank() ? forwardedProto : "https";
+            return scheme + "://" + forwardedHost.split(",")[0].trim();
+        }
+        String scheme = request.getScheme();
+        int port = request.getServerPort();
+        String host = request.getServerName();
+        boolean defaultPort = ("http".equals(scheme) && port == 80) || ("https".equals(scheme) && port == 443);
+        return defaultPort ? scheme + "://" + host : scheme + "://" + host + ":" + port;
+    }
+}