{"repo": "changluei/pptgo", "files": {"app/api/ai/generate/route.ts": {"434156dd8f26ce3ac8b999676c2e8ce7cfbcc3cc": {"t": 1785745578.237695, "n": 4777, "h": "403c354fa6a3ab39", "c": "import { NextRequest, NextResponse } from \"next/server\";\n\ntype GenerateRequest = {\n  title?: string;\n  brief?: string;\n  theme?: string;\n  themePackage?: string;\n  layouts?: string[];\n  signatureLayouts?: string[];\n  attachments?: Array<{ name?: string; type?: string; size?: number }>;\n};\n\nfunction stripCodeFence(content: string) {\n  return content\n    .replace(/^```(?:markdown|md)?\\s*/i, \"\")\n    .replace(/\\s*```$/, \"\")\n    .trim();\n}\n\nfunction isAllowedBaseUrl(value: string) {\n  try {\n    const url = new URL(value);\n    const isLocalHttp =\n      url.protocol === \"http:\" &&\n      [\"localhost\", \"127.0.0.1\", \"::1\"].includes(url.hostname);\n    return url.protocol === \"https:\" || isLocalHttp;\n  } catch {\n    return false;\n  }\n}\n\nexport async function POST(request: NextRequest) {\n  const body = (await request.json()) as GenerateRequest;\n  const title = body.title?.trim();\n  const brief = body.brief?.trim();\n\n  if (!title || !brief) {\n    return NextResponse.json({ error: \"title and brief are required\" }, { status: 400 });\n  }\n\n  const apiKey =\n    request.headers.get(\"x-deepseek-api-key\")?.trim() ||\n    process.env.DEEPSEEK_API_KEY;\n  if (!apiKey) {\n    return NextResponse.json({ error: \"DeepSeek API Key is required\" }, { status: 503 });\n  }\n\n  const baseUrl = (\n    request.headers.get(\"x-deepseek-base-url\")?.trim() ||\n    process.env.DEEPSEEK_BASE_URL ||\n    \"https://api.deepseek.com\"\n  ).replace(/\\/$/, \"\");\n  const model =\n    request.headers.get(\"x-deepseek-model\")?.trim() ||\n    process.env.DEEPSEEK_MODEL ||\n    \"deepseek-v4-pro\";\n\n  if (!isAllowedBaseUrl(baseUrl)) {\n    return NextResponse.json({ error: \"Invalid DeepSeek API URL\" }, { status: 400 });\n  }\n\n  const attachmentSummary = (body.attachments || [])\n    .slice(0, 30)\n    .map((item) => `- ${item.name || \"未命名文件\"}（${item.type || \"未知类型\"}）`)\n    .join(\"\\n\");\n  const availableLayouts = (body.layouts || [])\n    .filter((layout) => /^[a-zA-Z0-9_-]+$/.test(layout))\n    .slice(0, 40);\n  const layoutSummary = availableLayouts.length\n    ? availableLayouts.join(\", \")\n    : \"cover, default, center, section, fact, statement, quote, two-cols, image-left, image-right\";\n  const signatureLayouts = (body.signatureLayouts || [])\n    .filter((layout) => /^[a-zA-Z0-9_-]+$/.test(layout))\n    .slice(0, 30);\n  const signatureLayoutSummary = signatureLayouts.length\n    ? signatureLayouts.join(\", \")\n    : \"未检测到主题专属布局\";\n\n  const response = await fetch(`${baseUrl}/chat/completions`, {\n    method: \"POST\",\n    headers: {\n      Authorization: `Bearer ${apiKey}`,\n      \"Content-Type\": \"application/json\",\n    },\n    body: JSON.stringify({\n      model,\n      temperature: 0.58,\n      max_tokens: 8000,\n      messages: [\n        {\n          role: \"system\",\n          content: [\n            \"你是资深演示文稿策略顾问、中文写作者和 Slidev 排版专家。\",\n            \"先在内部完成受众、目标、核心结论、证据链和叙事节奏的规划，但最终只返回完整可运行的 Slidev Markdown，不解释、不包裹代码块。\",\n            \"首部必须包含 theme、title、transition 和 layout 的 YAML headmatter；使用 --- 分页，并用每页 frontmatter 指定 layout。\",\n            \"theme 值必须与用户提供的 Slidev 主题完全一致；若包含 @、/ 或其他符号，必须用 YAML 引号包裹。\",\n            \"演示不是提纲。每一页都要推动一个明确判断：给出上下文、论据、含义或行动，避免只有标题加两三个空泛短句。\",\n            \"默认生成 10–14 页；若用户明确指定页数则服从。内容页通常提供 3–5 个有信息量的要点，或一个完整图表/流程/对比结构。\",\n            \"至少使用 5 种不同布局，连续两页不要使用相同布局。仅使用用户提供的布局列表，不发明主题组件。\",\n            \"优先使用主题专属布局，让成稿明显体现所选模板，而不是所有页面都退化成通用 default/cover。封面优先采用主题专属的 intro/title 类布局。\",\n            \"在封面、章节、事实数字、双栏对比、流程、引用和行动页之间形成节奏。two-cols 布局使用 ::right:: 分栏。\",\n            \"每个重要内容页末尾加入 <!-- ... --> 演讲者备注，写 2–4 句讲述提示、过渡或风险说明。\",\n            \"可以使用 Mermaid 表达流程、时间线和关系。不要虚构来源中没有的数字、事实或引语；缺少证据时明确标为“待补充数据”或给出验证建议。\",\n            \"图片附件使用 Markdown 引用 attachment://原文件名，不要猜测图片内容。\",\n          ].join(\"\\n\"),\n        },\n        {\n          role: \"user\",\n          content: [\n            `演示标题：${title}`,\n            `Slidev 主题：${body.theme || \"default\"}`,\n            `实际安装的主题包：${body.themePackage || \"未提供\"}`,\n            `该主题可用布局：${layoutSummary}`,\n            `该主题专属布局（优先使用）：${signatureLayoutSummary}`,\n            `用户要求：${brief}`,\n            attachmentSummary\n              ? `当前演示文稿的附件（仅提供文件名与类型，无法读取图片内容）：\\n${attachmentSummary}`\n              : \"当前没有附件。\",\n            \"请把用户要求发展成一条完整叙事：为什么现在要讲、我们看到了什么、核心判断是什么、有哪些方案与取舍、接下来具体怎么做。不要为了简洁牺牲必要论证。\",\n          ].join(\"\\n\\n\"),\n        },\n      ],\n    }),\n  });\n\n  if (!response.ok) {\n    return NextResponse.json(\n      { error: `DeepSeek request failed: ${response.status}` },\n      { status: 502 },\n    );\n  }\n\n  const data = (await response.json()) as {\n    choices?: Array<{ message?: { content?: string } }>;\n  };\n  const content = data.choices?.[0]?.message?.content;\n  if (!content) {\n    return NextResponse.json({ error: \"DeepSeek returned no content\" }, { status: 502 });\n  }\n\n  return NextResponse.json({ markdown: stripCodeFence(content) });\n}\n"}}}}