Fredrik Johansson
4eee44f675
Clipboard/screenshot sync across own devices via a single DEVICE_TOKEN-gated blob store, plus a small installable web app so a phone can push/pull clips and share screenshots via the OS share sheet.
90 lines
2.4 KiB
TypeScript
90 lines
2.4 KiB
TypeScript
import { Router } from 'express'
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import fs from 'node:fs'
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import { config } from './config.js'
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import { db, blobPath } from './db.js'
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import { newBlobId } from './ids.js'
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import { checkDeviceToken } from './auth.js'
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import { insertBlobRecord } from './blobs.js'
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export const router = Router()
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interface BlobRow {
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id: string
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kind: 'clip' | 'shot'
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content_type: string
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size_bytes: number
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created_at: number
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expires_at: number
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}
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router.post('/blobs', (req, res) => {
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if (!checkDeviceToken(req)) {
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res.status(401).json({ error: 'bad device token' })
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return
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}
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const kind = req.get('X-Blob-Kind')
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if (kind !== 'clip' && kind !== 'shot') {
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res.status(400).json({ error: 'X-Blob-Kind must be "clip" or "shot"' })
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return
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}
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const contentLength = Number(req.get('Content-Length') ?? 0)
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if (contentLength > config.maxUploadBytes) {
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res.status(413).json({ error: 'blob too large' })
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return
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}
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const id = newBlobId()
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const dest = blobPath(id)
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const writeStream = fs.createWriteStream(dest, { flags: 'wx' })
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let bytesReceived = 0
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req.on('data', (chunk: Buffer) => {
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bytesReceived += chunk.length
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if (bytesReceived > config.maxUploadBytes) {
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req.destroy()
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writeStream.destroy()
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fs.rm(dest, { force: true }, () => {})
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}
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})
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req.pipe(writeStream)
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writeStream.on('finish', () => {
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insertBlobRecord(id, kind, req.get('Content-Type') ?? 'application/octet-stream', bytesReceived)
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res.json({ id, url: kind === 'shot' ? `/s/${id}` : null })
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})
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writeStream.on('error', () => {
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fs.rm(dest, { force: true }, () => {})
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if (!res.headersSent) res.status(500).json({ error: 'write failed' })
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})
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})
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// Latest non-expired clip, for the pull side of clipboard sync — no
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// history, no listing, just "what's the newest thing I copied elsewhere."
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router.get('/clip/latest', (req, res) => {
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if (!checkDeviceToken(req)) {
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res.status(401).json({ error: 'bad device token' })
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return
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}
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const now = Math.floor(Date.now() / 1000)
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const row = db
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.prepare(
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`SELECT * FROM blobs WHERE kind = 'clip' AND expires_at > ? ORDER BY created_at DESC LIMIT 1`,
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)
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.get(now) as BlobRow | undefined
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if (!row) {
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res.status(204).end()
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return
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}
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res.set('Content-Type', row.content_type)
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res.set('X-Blob-Id', row.id)
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res.set('X-Blob-Created-At', String(row.created_at))
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fs.createReadStream(blobPath(row.id)).pipe(res)
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})
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