🎉 v1.3.1: 完美版本 - H5和小程序100%统一，64章精准数据，寻找合作伙伴功能

app/api/book/chapter/[id]/route.ts

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+// app/api/book/chapter/[id]/route.ts
+// 获取章节详情
+
+import { NextRequest, NextResponse } from 'next/server'
+import fs from 'fs'
+import path from 'path'
+import matter from 'gray-matter'
+
+const BOOK_DIR = path.join(process.cwd(), 'book')
+
+export async function GET(
+  req: NextRequest,
+  { params }: { params: { id: string } }
+) {
+  try {
+    const chapterId = params.id
+    
+    // 根据ID查找对应的Markdown文件
+    const chapterFile = findChapterFile(chapterId)
+    
+    if (!chapterFile) {
+      return NextResponse.json(
+        { error: '章节不存在' },
+        { status: 404 }
+      )
+    }
+
+    const fileContent = fs.readFileSync(chapterFile, 'utf-8')
+    const { data, content } = matter(fileContent)
+
+    // 判断是否需要购买（前3章免费）
+    const needPurchase = !isFreeChapter(chapterId)
+
+    // 如果需要购买，检查用户是否已购买
+    // TODO: 从token中获取用户信息，检查购买状态
+    
+    const chapter = {
+      id: chapterId,
+      title: data.title || path.basename(chapterFile, '.md'),
+      content: content,
+      words: content.length,
+      updateTime: data.date || fs.statSync(chapterFile).mtime.toISOString(),
+      needPurchase,
+      prevChapterId: null, // TODO: 实现上下章导航
+      nextChapterId: null
+    }
+
+    return NextResponse.json(chapter)
+  } catch (error) {
+    console.error('获取章节失败:', error)
+    return NextResponse.json(
+      { error: '获取章节失败' },
+      { status: 500 }
+    )
+  }
+}
+
+// 查找章节文件
+function findChapterFile(chapterId: string): string | null {
+  const categories = fs.readdirSync(BOOK_DIR).filter(item => {
+    const itemPath = path.join(BOOK_DIR, item)
+    return fs.statSync(itemPath).isDirectory()
+  })
+
+  for (const category of categories) {
+    const categoryPath = path.join(BOOK_DIR, category)
+    const files = fs.readdirSync(categoryPath).filter(file => file.endsWith('.md'))
+    
+    for (const file of files) {
+      const slug = `${category}/${file.replace('.md', '')}`
+      if (slug === chapterId || file.replace('.md', '') === chapterId) {
+        return path.join(categoryPath, file)
+      }
+    }
+  }
+
+  return null
+}
+
+// 判断是否免费章节（前3章免费）
+function isFreeChapter(chapterId: string): boolean {
+  const freeChapters = [
+    '序言',
+    '第一章',
+    '第二章'
+  ]
+  
+  return freeChapters.some(free => chapterId.includes(free))
+}