feat(system): 支持后台维护三语协议

fruitshorts-app-api/src/main/java/com/fruitshorts/app/controller/LegalPageController.java

@@ -0,0 +1,44 @@
+// Author: fruit.com.cn
+
+package com.fruitshorts.app.controller;
+
+import com.fruitshorts.system.service.LegalDocumentService;
+import com.fruitshorts.system.service.LegalPages;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * 协议公开页。客户端按当前语言打开 /privacy/zh 或 /terms/en，不需要登录。
+ */
+@RestController
+@RequiredArgsConstructor
+public class LegalPageController {
+
+    private static final MediaType HTML = MediaType.parseMediaType("text/html;charset=UTF-8");
+
+    private final LegalDocumentService legalDocumentService;
+
+    /** 隐私协议。语言只接受 zh、en、id。 */
+    @GetMapping("/" + LegalPages.PATH_PRIVACY + "/{lang}")
+    public ResponseEntity<String> privacy(@PathVariable String lang) {
+        return page(LegalPages.PATH_PRIVACY, lang);
+    }
+
+    /** 服务条款。语言只接受 zh、en、id。 */
+    @GetMapping("/" + LegalPages.PATH_TERMS + "/{lang}")
+    public ResponseEntity<String> terms(@PathVariable String lang) {
+        return page(LegalPages.PATH_TERMS, lang);
+    }
+
+    private ResponseEntity<String> page(String path, String lang) {
+        String html = legalDocumentService.render(path, lang);
+        if (html == null) {
+            return ResponseEntity.notFound().build();
+        }
+        return ResponseEntity.ok().contentType(HTML).body(html);
+    }
+}