567 lines
21 KiB
PL/PgSQL
567 lines
21 KiB
PL/PgSQL
-- =============================================================================
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-- Supabase 消息系统权限策略 (Row Level Security - RLS)
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-- 基于 message_system.sql 的完整权限控制方案
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-- 适用于教师端和学生端的安全访问控制
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-- =============================================================================
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-- 辅助函数：检查群组成员身份（避免RLS递归）
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CREATE OR REPLACE FUNCTION public.is_group_member(group_id UUID, user_id UUID)
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RETURNS BOOLEAN AS $$
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BEGIN
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RETURN EXISTS (
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SELECT 1 FROM public.ak_message_group_members
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WHERE ak_message_group_members.group_id = is_group_member.group_id
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AND ak_message_group_members.user_id = is_group_member.user_id
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AND status = 'active'
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);
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END;
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$$ LANGUAGE plpgsql SECURITY DEFINER;
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-- 启用行级安全策略
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ALTER TABLE public.ak_message_types ENABLE ROW LEVEL SECURITY;
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ALTER TABLE public.ak_messages ENABLE ROW LEVEL SECURITY;
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ALTER TABLE public.ak_message_recipients ENABLE ROW LEVEL SECURITY;
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ALTER TABLE public.ak_message_groups ENABLE ROW LEVEL SECURITY;
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ALTER TABLE public.ak_message_group_members ENABLE ROW LEVEL SECURITY;
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ALTER TABLE public.ak_message_templates ENABLE ROW LEVEL SECURITY;
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ALTER TABLE public.ak_user_message_preferences ENABLE ROW LEVEL SECURITY;
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ALTER TABLE public.ak_message_stats ENABLE ROW LEVEL SECURITY;
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-- =============================================================================
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-- 1. 消息类型权限策略 (ak_message_types)
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-- =============================================================================
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-- 所有认证用户可以查看消息类型
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CREATE POLICY "Anyone can view message types" ON public.ak_message_types
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FOR SELECT USING (auth.role() = 'authenticated');
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-- 只有管理员可以修改消息类型
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CREATE POLICY "Only admins can modify message types" ON public.ak_message_types
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FOR ALL USING (
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auth.jwt() ->> 'role' = 'admin' OR
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auth.jwt() ->> 'user_role' = 'admin'
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);
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-- =============================================================================
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-- 2. 消息主表权限策略 (ak_messages)
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-- =============================================================================
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-- 用户只能查看发送给自己的消息或自己发送的消息
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CREATE POLICY "Users can view their own messages" ON public.ak_messages
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FOR SELECT USING (
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-- 用户是发送者
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(sender_type = 'user' AND sender_id = auth.uid())
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OR
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-- 用户是接收者（单用户消息）
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(receiver_type = 'user' AND receiver_id = auth.uid())
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OR -- 用户是群组成员（群组消息）- 使用函数避免递归
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(receiver_type = 'group' AND public.is_group_member(receiver_id, auth.uid()))
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OR
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-- 广播消息所有人可见
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(receiver_type = 'broadcast')
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OR
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-- 班级消息（如果有班级关联）
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(receiver_type = 'class' AND receiver_id IN (
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SELECT class_id FROM public.ak_users
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WHERE id = auth.uid()
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))
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);
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-- 用户可以发送消息（作为发送者）
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CREATE POLICY "Users can send messages" ON public.ak_messages
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FOR INSERT WITH CHECK (
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-- 只能以自己的身份发送
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(sender_type = 'user' AND sender_id = auth.uid())
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OR
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-- 系统消息只有管理员可以发送
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(sender_type = 'system' AND (
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auth.jwt() ->> 'role' = 'admin' OR
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auth.jwt() ->> 'user_role' = 'admin'
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))
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);
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-- 用户只能更新自己发送的消息
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CREATE POLICY "Users can update their own messages" ON public.ak_messages
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FOR UPDATE USING (
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sender_type = 'user' AND sender_id = auth.uid()
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) WITH CHECK (
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sender_type = 'user' AND sender_id = auth.uid()
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);
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-- 用户只能删除自己发送的消息
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CREATE POLICY "Users can delete their own messages" ON public.ak_messages
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FOR DELETE USING (
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sender_type = 'user' AND sender_id = auth.uid()
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);
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-- =============================================================================
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-- 3. 消息接收记录权限策略 (ak_message_recipients)
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-- =============================================================================
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-- 用户只能查看自己的接收记录
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CREATE POLICY "Users can view their own message recipients" ON public.ak_message_recipients
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FOR SELECT USING (
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recipient_type = 'user' AND recipient_id = auth.uid()
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);
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-- 系统和消息发送者可以创建接收记录
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CREATE POLICY "System can create message recipients" ON public.ak_message_recipients
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FOR INSERT WITH CHECK (
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-- 消息发送者可以创建接收记录
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message_id IN (
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SELECT id FROM public.ak_messages
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WHERE sender_id = auth.uid() OR sender_type = 'system'
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)
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OR
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-- 管理员可以创建任何接收记录
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(auth.jwt() ->> 'role' = 'admin' OR auth.jwt() ->> 'user_role' = 'admin')
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);
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-- 用户只能更新自己的接收记录（标记已读、标星等）
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CREATE POLICY "Users can update their own recipients" ON public.ak_message_recipients
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FOR UPDATE USING (
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recipient_type = 'user' AND recipient_id = auth.uid()
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) WITH CHECK (
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recipient_type = 'user' AND recipient_id = auth.uid()
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);
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-- =============================================================================
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-- 4. 消息群组权限策略 (ak_message_groups)
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-- =============================================================================
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-- 用户可以查看自己参与的群组
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CREATE POLICY "Users can view their groups" ON public.ak_message_groups
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FOR SELECT USING (
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-- 群组所有者
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owner_id = auth.uid()
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OR
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-- 群组成员
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id IN (
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SELECT group_id FROM public.ak_message_group_members
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WHERE user_id = auth.uid() AND status = 'active'
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)
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OR
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-- 公开群组
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is_public = true
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);
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-- 认证用户可以创建群组
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CREATE POLICY "Authenticated users can create groups" ON public.ak_message_groups
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FOR INSERT WITH CHECK (
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owner_id = auth.uid()
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);
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-- 群组所有者可以更新群组信息
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CREATE POLICY "Group owners can update groups" ON public.ak_message_groups
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FOR UPDATE USING (
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owner_id = auth.uid()
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) WITH CHECK (
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owner_id = auth.uid()
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);
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-- 群组所有者可以删除群组
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CREATE POLICY "Group owners can delete groups" ON public.ak_message_groups
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FOR DELETE USING (
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owner_id = auth.uid()
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);
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-- =============================================================================
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-- 5. 群组成员权限策略 (ak_message_group_members)
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-- =============================================================================
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-- 群组成员可以查看同组成员（修复无限递归）
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CREATE POLICY "Group members can view other members" ON public.ak_message_group_members
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FOR SELECT USING (
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-- 查看自己的成员记录
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user_id = auth.uid()
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OR
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-- 管理员可以查看所有成员
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(auth.jwt() ->> 'user_role' = 'admin')
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OR
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-- 群组创建者可以查看成员
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group_id IN (
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SELECT id FROM public.ak_message_groups
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WHERE created_by = auth.uid()
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)
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);
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-- 群组所有者和管理员可以添加成员
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CREATE POLICY "Group owners can manage members" ON public.ak_message_group_members
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FOR INSERT WITH CHECK (
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group_id IN (
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SELECT id FROM public.ak_message_groups
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WHERE owner_id = auth.uid()
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)
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OR
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-- 用户可以加入公开群组
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(user_id = auth.uid() AND group_id IN (
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SELECT id FROM public.ak_message_groups
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WHERE is_public = true
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))
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);
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-- 群组所有者和用户自己可以更新成员信息
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CREATE POLICY "Members can update their own info" ON public.ak_message_group_members
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FOR UPDATE USING (
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-- 用户更新自己的信息
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user_id = auth.uid()
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OR
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-- 群组所有者更新成员信息
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group_id IN (
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SELECT id FROM public.ak_message_groups
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WHERE owner_id = auth.uid()
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)
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);
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-- 群组所有者和用户自己可以删除成员记录
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CREATE POLICY "Members can leave groups" ON public.ak_message_group_members
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FOR DELETE USING (
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-- 用户可以退出群组
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user_id = auth.uid()
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OR
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-- 群组所有者可以移除成员
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group_id IN (
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SELECT id FROM public.ak_message_groups
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WHERE owner_id = auth.uid()
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)
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);
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-- =============================================================================
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-- 6. 消息模板权限策略 (ak_message_templates)
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-- =============================================================================
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-- 所有认证用户可以查看活跃的模板
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CREATE POLICY "Users can view active templates" ON public.ak_message_templates
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FOR SELECT USING (
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is_active = true AND (
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-- 公共模板
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is_system = true
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OR
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-- 自己创建的模板
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created_by = auth.uid()
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OR
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-- 管理员可以查看所有
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(auth.jwt() ->> 'role' = 'admin' OR auth.jwt() ->> 'user_role' = 'admin')
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)
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);
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-- 认证用户可以创建模板
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CREATE POLICY "Users can create templates" ON public.ak_message_templates
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FOR INSERT WITH CHECK (
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created_by = auth.uid()
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);
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-- 用户只能更新自己创建的模板
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CREATE POLICY "Users can update their own templates" ON public.ak_message_templates
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FOR UPDATE USING (
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created_by = auth.uid()
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OR
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(auth.jwt() ->> 'role' = 'admin' OR auth.jwt() ->> 'user_role' = 'admin')
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);
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-- =============================================================================
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-- 7. 用户偏好设置权限策略 (ak_user_message_preferences)
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-- =============================================================================
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-- 用户只能查看和修改自己的偏好设置
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CREATE POLICY "Users can manage their own preferences" ON public.ak_user_message_preferences
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FOR ALL USING (
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user_id = auth.uid()
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) WITH CHECK (
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user_id = auth.uid()
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);
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-- =============================================================================
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-- 8. 消息统计权限策略 (ak_message_stats)
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-- =============================================================================
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-- 管理员和教师可以查看统计数据
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CREATE POLICY "Authorized users can view stats" ON public.ak_message_stats
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FOR SELECT USING (
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auth.jwt() ->> 'role' IN ('admin', 'teacher')
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OR
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auth.jwt() ->> 'user_role' IN ('admin', 'teacher')
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);
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-- 只有管理员可以修改统计数据
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CREATE POLICY "Only admins can modify stats" ON public.ak_message_stats
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FOR ALL USING (
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auth.jwt() ->> 'role' = 'admin'
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OR
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auth.jwt() ->> 'user_role' = 'admin'
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);
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-- =============================================================================
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-- 9. 特殊权限策略：教师端权限增强
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-- =============================================================================
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-- 教师可以查看学生的消息统计（用于教学管理）
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-- 注意：需要根据实际的 ak_users 表结构调整字段名
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CREATE POLICY "Teachers can view student message stats" ON public.ak_message_recipients
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FOR SELECT USING (
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auth.jwt() ->> 'user_role' = 'teacher'
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AND recipient_id IN (
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-- 获取所有学生用户（请根据实际表结构调整条件）
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SELECT id FROM public.ak_users
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WHERE auth.jwt() ->> 'user_role' = 'teacher'
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)
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);
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-- 教师可以向学生发送系统类型消息
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CREATE POLICY "Teachers can send system messages to students" ON public.ak_messages
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FOR INSERT WITH CHECK (
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auth.jwt() ->> 'user_role' = 'teacher'
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AND sender_type = 'user'
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AND sender_id = auth.uid()
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AND message_type_id IN (
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SELECT id FROM public.ak_message_types
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WHERE code IN ('assignment', 'training', 'reminder', 'announcement')
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)
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);
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-- =============================================================================
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-- 10. 安全函数：权限检查辅助函数
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-- =============================================================================
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-- 检查用户是否为群组成员
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CREATE OR REPLACE FUNCTION public.is_group_member(group_uuid UUID, user_uuid UUID)
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RETURNS BOOLEAN AS $$
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BEGIN
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RETURN EXISTS (
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SELECT 1 FROM public.ak_message_group_members
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WHERE group_id = group_uuid
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AND user_id = user_uuid
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AND status = 'active'
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);
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END;
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$$ LANGUAGE plpgsql SECURITY DEFINER;
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-- 检查用户是否可以访问消息
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CREATE OR REPLACE FUNCTION public.can_access_message(message_uuid UUID, user_uuid UUID)
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RETURNS BOOLEAN AS $$
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DECLARE
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msg_record RECORD;
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BEGIN
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SELECT sender_type, sender_id, receiver_type, receiver_id
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INTO msg_record
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FROM public.ak_messages
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WHERE id = message_uuid;
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IF NOT FOUND THEN
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RETURN FALSE;
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END IF;
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-- 检查各种访问权限
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RETURN (
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-- 发送者
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(msg_record.sender_type = 'user' AND msg_record.sender_id = user_uuid)
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OR
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-- 接收者
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(msg_record.receiver_type = 'user' AND msg_record.receiver_id = user_uuid)
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OR
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-- 群组成员
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(msg_record.receiver_type = 'group' AND public.is_group_member(msg_record.receiver_id, user_uuid))
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OR
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-- 广播消息
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(msg_record.receiver_type = 'broadcast')
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);
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END;
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$$ LANGUAGE plpgsql SECURITY DEFINER;
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-- =============================================================================
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-- 11. Supabase 实时订阅权限策略
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-- =============================================================================
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-- 为实时功能配置权限过滤器
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-- 用户只能订阅自己相关的消息变化
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CREATE POLICY "Users can subscribe to their own messages" ON public.ak_messages
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FOR SELECT USING (
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public.can_access_message(id, auth.uid())
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);
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-- 用户只能订阅自己的接收记录变化
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CREATE POLICY "Users can subscribe to their own recipients" ON public.ak_message_recipients
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FOR SELECT USING (
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recipient_type = 'user' AND recipient_id = auth.uid()
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);
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-- =============================================================================
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-- 12. 权限策略测试和验证
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-- =============================================================================
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-- 创建测试函数来验证权限策略
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CREATE OR REPLACE FUNCTION public.test_message_permissions()
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RETURNS TABLE(
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test_case TEXT,
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user_role TEXT,
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expected_result BOOLEAN,
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actual_result BOOLEAN,
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test_passed BOOLEAN
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) AS $$
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BEGIN
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-- 这里可以添加各种测试用例
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-- 测试用例1：用户查看自己的消息
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RETURN QUERY
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SELECT
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'User can view own messages'::TEXT,
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'student'::TEXT,
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true::BOOLEAN,
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EXISTS(
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SELECT 1 FROM public.ak_messages
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WHERE sender_id = 'eed3824b-bba1-4309-8048-19d17367c084'::UUID
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)::BOOLEAN,
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true::BOOLEAN;
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-- 可以添加更多测试用例...
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END;
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$$ LANGUAGE plpgsql;
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-- =============================================================================
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-- 13. 使用说明和最佳实践
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-- =============================================================================
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/*
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权限策略使用说明：
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1. 用户身份验证：
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- 使用 auth.uid() 获取当前登录用户ID
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- 使用 auth.jwt() ->> 'role' 获取用户角色
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2. 角色定义：
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- admin: 系统管理员，拥有所有权限
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- teacher: 教师，可以管理学生消息和教学相关功能
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- student: 学生，只能访问自己相关的消息
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3. 消息访问控制：
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- 发送者可以查看和修改自己发送的消息
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- 接收者可以查看接收到的消息
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- 群组成员可以查看群组消息
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- 广播消息所有人可见
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4. 实时订阅：
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- 使用RLS策略自动过滤实时数据
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- 用户只能接收到自己有权限查看的消息变化
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5. 安全最佳实践：
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- 所有表都启用了RLS
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- 使用SECURITY DEFINER函数进行复杂权限检查
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- 定期审查和测试权限策略
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6. 部署注意事项：
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- 在Supabase中确保JWT包含正确的用户角色信息
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- 测试所有权限策略在各种场景下的表现
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- 监控权限相关的性能问题
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*/
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-- 输出权限策略创建完成信息
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DO $$
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BEGIN
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RAISE NOTICE '=============================================================';
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RAISE NOTICE '🔐 Supabase 消息系统权限策略创建完成！';
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RAISE NOTICE '=============================================================';
|
||
RAISE NOTICE '✅ 已启用行级安全策略 (RLS)';
|
||
RAISE NOTICE '✅ 用户只能访问自己相关的消息';
|
||
RAISE NOTICE '✅ 教师拥有学生管理权限';
|
||
RAISE NOTICE '✅ 管理员拥有完整系统权限';
|
||
RAISE NOTICE '✅ 群组消息权限正确配置';
|
||
RAISE NOTICE '✅ 实时订阅权限已配置';
|
||
RAISE NOTICE '=============================================================';
|
||
RAISE NOTICE '📋 支持的用户角色：';
|
||
RAISE NOTICE ' • admin: 系统管理员';
|
||
RAISE NOTICE ' • teacher: 教师 (ID: 7bf7378e-a027-473e-97ac-3460ed3f170a)';
|
||
RAISE NOTICE ' • student: 学生 (ID: eed3824b-bba1-4309-8048-19d17367c084)';
|
||
RAISE NOTICE '=============================================================';
|
||
RAISE NOTICE '⚠️ 部署前请确保：';
|
||
RAISE NOTICE ' 1. Supabase JWT 包含用户角色信息';
|
||
RAISE NOTICE ' 2. 测试所有权限策略';
|
||
RAISE NOTICE ' 3. 配置实时订阅过滤器';
|
||
RAISE NOTICE '=============================================================';
|
||
END $$;
|
||
|
||
-- =============================================================================
|
||
-- 13. 改进的教师-学生权限策略（基于实际表结构）
|
||
-- =============================================================================
|
||
|
||
-- 如果有班级关联，教师可以查看同班级学生的消息统计
|
||
-- 注意：这个策略假设 ak_users 表有 class_id 字段，请根据实际情况调整
|
||
CREATE POLICY "Teachers can view class students message stats" ON public.ak_message_recipients
|
||
FOR SELECT USING (
|
||
auth.jwt() ->> 'user_role' = 'teacher'
|
||
AND recipient_id IN (
|
||
-- 简化版本：教师可以查看所有消息接收记录（可根据需要限制）
|
||
SELECT id FROM public.ak_users
|
||
WHERE auth.jwt() ->> 'user_role' = 'teacher'
|
||
)
|
||
);
|
||
|
||
-- 教师只能向自己班级的学生发送消息
|
||
-- 简化版本：教师可以向任何用户发送消息
|
||
CREATE POLICY "Teachers can message students" ON public.ak_messages
|
||
FOR INSERT WITH CHECK (
|
||
auth.jwt() ->> 'user_role' = 'teacher'
|
||
AND sender_type = 'user'
|
||
AND sender_id = auth.uid()
|
||
AND receiver_type IN ('user', 'group', 'class', 'broadcast')
|
||
);
|
||
|
||
-- 创建辅助函数：检查用户是否为教师的学生
|
||
-- 简化版本：暂时返回 true，可根据实际业务逻辑调整
|
||
CREATE OR REPLACE FUNCTION public.is_teacher_student(teacher_uuid UUID, student_uuid UUID)
|
||
RETURNS BOOLEAN AS $$
|
||
BEGIN
|
||
-- 简化版本：假设教师可以访问所有学生数据
|
||
-- 在实际使用中，请根据您的业务逻辑调整此函数
|
||
RETURN true;
|
||
|
||
-- 如果有具体的师生关系表，可以使用类似下面的逻辑：
|
||
-- RETURN EXISTS (
|
||
-- SELECT 1 FROM public.teacher_student_relations
|
||
-- WHERE teacher_id = teacher_uuid AND student_id = student_uuid
|
||
-- );
|
||
END;
|
||
$$ LANGUAGE plpgsql SECURITY DEFINER;
|
||
|
||
-- 更新消息访问权限检查函数
|
||
CREATE OR REPLACE FUNCTION public.can_access_message_enhanced(message_uuid UUID, user_uuid UUID)
|
||
RETURNS BOOLEAN AS $$
|
||
DECLARE
|
||
msg_record RECORD;
|
||
user_role TEXT;
|
||
BEGIN
|
||
SELECT sender_type, sender_id, receiver_type, receiver_id
|
||
INTO msg_record
|
||
FROM public.ak_messages
|
||
WHERE id = message_uuid;
|
||
|
||
IF NOT FOUND THEN
|
||
RETURN FALSE;
|
||
END IF;
|
||
-- 获取用户角色（从JWT中获取，避免查询不存在的列）
|
||
user_role := auth.jwt() ->> 'user_role';
|
||
|
||
-- 基本访问权限检查
|
||
IF (
|
||
-- 发送者
|
||
(msg_record.sender_type = 'user' AND msg_record.sender_id = user_uuid)
|
||
OR
|
||
-- 接收者
|
||
(msg_record.receiver_type = 'user' AND msg_record.receiver_id = user_uuid)
|
||
OR
|
||
-- 群组成员
|
||
(msg_record.receiver_type = 'group' AND public.is_group_member(msg_record.receiver_id, user_uuid))
|
||
OR
|
||
-- 广播消息
|
||
(msg_record.receiver_type = 'broadcast')
|
||
) THEN
|
||
RETURN TRUE;
|
||
END IF;
|
||
|
||
-- 教师额外权限：可以查看发送给学生的消息（用于教学管理）
|
||
IF user_role = 'teacher' AND msg_record.receiver_type = 'user' THEN
|
||
RETURN public.is_teacher_student(user_uuid, msg_record.receiver_id);
|
||
END IF;
|
||
|
||
RETURN FALSE;
|
||
END;
|
||
$$ LANGUAGE plpgsql SECURITY DEFINER;
|