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        <h1><a href="../index.html">All files</a> / <a href="index.html">middleware</a> usageLimit.ts</h1>
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import { prisma } from '../models';
import { QuotaExceededError, ForbiddenError } from './errorHandler';
import { MEMBER_QUOTA, MemberLevel } from '../types';
&nbsp;
// 检查使用次数限制
<span class="cstat-no" title="statement not covered" >export async function usageLimitMiddleware(ctx: Context, next: Next): Promise&lt;void&gt; {</span>
<span class="cstat-no" title="statement not covered" >  const userId = ctx.state.user?.userId;</span>
&nbsp;
  // 测试模式：无需登录即可使用
<span class="cstat-no" title="statement not covered" >  if (!userId) {</span>
<span class="cstat-no" title="statement not covered" >    ctx.state.userQuota = { dailyLimit: -1, wordLimit: -1 };</span>
<span class="cstat-no" title="statement not covered" >    await next();</span>
<span class="cstat-no" title="statement not covered" >    return;</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  const user = await prisma.user.findUnique({ where: { id: parseInt(userId) } });</span>
<span class="cstat-no" title="statement not covered" >  if (!user) {</span>
<span class="cstat-no" title="statement not covered" >    throw new ForbiddenError('用户不存在');</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  const today = new Date().toISOString().slice(0, 10);</span>
<span class="cstat-no" title="statement not covered" >  const memberLevel = user.memberLevel;</span>
<span class="cstat-no" title="statement not covered" >  const quota = MEMBER_QUOTA[memberLevel as MemberLevel];</span>
&nbsp;
  // 重置每日使用次数
<span class="cstat-no" title="statement not covered" >  if (user.lastUsageDate !== today) {</span>
<span class="cstat-no" title="statement not covered" >    await prisma.user.update({</span>
<span class="cstat-no" title="statement not covered" >      where: { id: parseInt(userId) },</span>
<span class="cstat-no" title="statement not covered" >      data: {</span>
<span class="cstat-no" title="statement not covered" >        dailyUsage: 0,</span>
<span class="cstat-no" title="statement not covered" >        lastUsageDate: today,</span>
<span class="cstat-no" title="statement not covered" >      },</span>
<span class="cstat-no" title="statement not covered" >    });</span>
<span class="cstat-no" title="statement not covered" >    user.dailyUsage = 0;</span>
<span class="cstat-no" title="statement not covered" >    user.lastUsageDate = today;</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
  // 检查次数限制 (-1 表示无限制)
<span class="cstat-no" title="statement not covered" >  if (quota.dailyLimit !== -1 &amp;&amp; user.dailyUsage &gt;= quota.dailyLimit) {</span>
<span class="cstat-no" title="statement not covered" >    throw new QuotaExceededError(`今日使用次数已达上限（${quota.dailyLimit}次），请升级会员`);</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
  // 将用户信息和配额存入 state
<span class="cstat-no" title="statement not covered" >  ctx.state.userQuota = quota;</span>
<span class="cstat-no" title="statement not covered" >  ctx.state.userInfo = user;</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  await next();</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
// 检查字数限制
<span class="cstat-no" title="statement not covered" >export function checkWordLimit(wordCount: number): (ctx: Context, next: Next) =&gt; Promise&lt;void&gt; {</span>
<span class="cstat-no" title="statement not covered" >  return async (ctx: Context, next: Next) =&gt; {</span>
<span class="cstat-no" title="statement not covered" >    const quota = ctx.state.userQuota;</span>
<span class="cstat-no" title="statement not covered" >    if (!quota) {</span>
<span class="cstat-no" title="statement not covered" >      throw new ForbiddenError('请先检查使用限制');</span>
<span class="cstat-no" title="statement not covered" >    }</span>
&nbsp;
    // -1 表示无限制
<span class="cstat-no" title="statement not covered" >    if (quota.wordLimit !== -1 &amp;&amp; wordCount &gt; quota.wordLimit) {</span>
<span class="cstat-no" title="statement not covered" >      throw new QuotaExceededError(`文本字数超出限制（${quota.wordLimit}字），请升级会员或缩短文本`);</span>
<span class="cstat-no" title="statement not covered" >    }</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    await next();</span>
<span class="cstat-no" title="statement not covered" >  };</span>
<span class="cstat-no" title="statement not covered" >}</span></pre></td></tr></table></pre>

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