add: 添加云函数 Deta 部署功能

src/server/deta/README.md

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+# Deta
+
+本目录存储 Deta Space serverless functions 代码
+
+## 开发帮助文档
+
+https://deta.space/docs/en/build/new-apps
+
+https://deta.space/docs/en/build/reference/cli
+
+https://deta.space/docs/en/build/reference/spacefile
+
+https://deta.space/docs/en/build/quick-starts/node
+
+https://docs.mongodb.com/drivers/node/quick-start/
+
+http://mongodb.github.io/node-mongodb-native/3.6/api/

src/server/deta/Spacefile

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+# Spacefile Docs: https://go.deta.dev/docs/spacefile/v0
+v: 0
+micros:
+  - name: twikoo-deta
+    src: ./
+    engine: nodejs16
+    public: true
+    presets:
+      env:
+        - name: MONGODB_URI
+          description: Twikoo 评论系统 MongoDB 数据库 URI
+          default: ""

src/server/deta/index.js

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+/**
+ * Deta 兼容 Vercel 函数实现
+ * 复用 Twikoo Vercel 函数代码
+ */
+
+const twikoo = require('twikoo-vercel')
+const express = require('express')
+const app = express()
+
+// Tip: Deta 本身无法获取评论者 IP，需要使用 Cloudflare CDN 才能获取评论者 IP。
+// Docs: https://deta.space/docs/en/build/guides/accessing-client-ip-address
+process.env.TWIKOO_IP_HEADERS = JSON.stringify(['headers.cf-connecting-ip'])
+
+app.use(async function (req, res) {
+  const buffers = []
+  req.on('data', (chunk) => {
+    buffers.push(chunk)
+  })
+  req.on('end', async () => {
+    try {
+      req.body = JSON.parse(Buffer.concat(buffers).toString())
+    } catch (e) {
+      req.body = {}
+    }
+    res.status = function (code) {
+      res.statusCode = code
+      return this
+    }
+    res.json = function (json) {
+      if (!res.headersSent) {
+        res.setHeader('Content-Type', 'application/json')
+        res.status(200).send(JSON.stringify(json))
+      }
+      return this
+    }
+    return await twikoo(req, res)
+  })
+})
+
+app.listen(8080)

src/server/deta/package.json

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+{ "dependencies": { "twikoo-vercel": "latest","express": "latest" } }