新增视频播放地址api

src/main/java/xyz/playedu/api/caches/UserCanSeeCourseCache.java

@@ -0,0 +1,47 @@
+package xyz.playedu.api.caches;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+import xyz.playedu.api.bus.UserBus;
+import xyz.playedu.api.domain.Course;
+import xyz.playedu.api.domain.User;
+import xyz.playedu.api.exception.ServiceException;
+import xyz.playedu.api.util.RedisUtil;
+
+/**
+ * @Author 杭州白书科技有限公司
+ * @create 2023/3/20 15:20
+ */
+@Component
+public class UserCanSeeCourseCache {
+
+    @Autowired
+    private UserBus userBus;
+
+    private final static String keyTemplate = "c:%d-u:%d";
+
+    private final static int expire = 3600;//s
+
+    public boolean check(User user, Course course, boolean isThrow) throws ServiceException {
+        boolean result;
+        if (RedisUtil.exists(key(user, course))) {
+            result = "1".equals(RedisUtil.get(key(user, course)));
+        } else {
+            result = userBus.canSeeCourse(user, course);
+            put(user, course, result);
+        }
+        if (isThrow) {
+            throw new ServiceException("无权限观看");
+        }
+        return result;
+    }
+
+    public void put(User user, Course course, boolean result) {
+        RedisUtil.set(key(user, course), result ? "1" : "0", expire);
+    }
+
+    private String key(User user, Course course) {
+        return String.format(keyTemplate, course.getId(), user.getId());
+    }
+
+}