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server.js
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172 lines (147 loc) · 5.23 KB
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import 'dotenv/config'
import express from 'express'
import rateLimit from 'express-rate-limit'
const app = express()
app.use(express.json({ limit: '5mb' }))
const limiter = rateLimit({
windowMs: 60 * 1000,
max: 30,
standardHeaders: true,
legacyHeaders: false,
message: { error: { message: 'Too many requests. Please wait a minute.' } },
})
app.use('/api', limiter)
const API_KEY = process.env.ANTHROPIC_API_KEY
const API_URL = 'https://api.anthropic.com/v1/messages'
const ALLOWED_MODELS = [
'claude-sonnet-4-20250514',
'claude-haiku-4-5-20251001',
'claude-sonnet-4-6',
]
function validateRequest(body) {
const { model, max_tokens, system, messages } = body
if (!model || !messages?.length) return 'Missing required fields: model, messages'
if (!ALLOWED_MODELS.includes(model)) return `Model not allowed: ${model}`
if (max_tokens > 32000) return 'max_tokens exceeds limit (32000)'
if (system && typeof system !== 'string') return 'system must be a string'
return null
}
app.post('/api/claude', async (req, res) => {
if (!API_KEY) return res.status(500).json({ error: { message: 'API key not configured on server' } })
const validationError = validateRequest(req.body)
if (validationError) return res.status(400).json({ error: { message: validationError } })
try {
const response = await fetch(API_URL, {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'x-api-key': API_KEY,
'anthropic-version': '2023-06-01',
},
body: JSON.stringify({
model: req.body.model,
max_tokens: req.body.max_tokens,
system: req.body.system,
messages: req.body.messages,
}),
})
if (!response.ok) {
const err = await response.json().catch(() => ({}))
return res.status(response.status).json(err)
}
const data = await response.json()
if (data.stop_reason === 'max_tokens') {
console.log(`[claude] WARNING: Response truncated (max_tokens). Model: ${req.body.model}, limit: ${req.body.max_tokens}`)
}
res.json(data)
} catch (err) {
res.status(500).json({ error: { message: err.message } })
}
})
app.post('/api/claude/stream', async (req, res) => {
if (!API_KEY) return res.status(500).json({ error: { message: 'API key not configured on server' } })
const validationError = validateRequest(req.body)
if (validationError) return res.status(400).json({ error: { message: validationError } })
try {
const response = await fetch(API_URL, {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'x-api-key': API_KEY,
'anthropic-version': '2023-06-01',
},
body: JSON.stringify({
model: req.body.model,
max_tokens: req.body.max_tokens,
system: req.body.system,
messages: req.body.messages,
stream: true,
}),
})
if (!response.ok) {
const err = await response.json().catch(() => ({}))
return res.status(response.status).json(err)
}
res.setHeader('Content-Type', 'text/event-stream')
res.setHeader('Cache-Control', 'no-cache')
res.setHeader('Connection', 'keep-alive')
const reader = response.body.getReader()
req.on('close', () => reader.cancel())
try {
while (true) {
const { done, value } = await reader.read()
if (done) break
res.write(value)
}
res.end()
} catch {
if (!res.writableEnded) res.end()
}
} catch (err) {
if (!res.headersSent) {
res.status(500).json({ error: { message: err.message } })
}
}
})
app.get('/api/fetch-url', async (req, res) => {
const { url } = req.query
if (!url) return res.status(400).json({ error: { message: 'Missing url parameter' } })
try {
const response = await fetch(url, {
headers: {
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36',
'Accept': 'application/pdf,text/html,*/*',
},
signal: AbortSignal.timeout(30000),
redirect: 'follow',
})
if (!response.ok) throw new Error(`HTTP ${response.status}`)
const contentType = response.headers.get('content-type') || ''
if (contentType.includes('application/pdf')) {
const buffer = Buffer.from(await response.arrayBuffer())
res.json({ type: 'pdf', contents: buffer.toString('base64') })
} else {
const html = await response.text()
res.json({ type: 'html', contents: html })
}
} catch (err) {
res.status(502).json({ error: { message: `Failed to fetch URL: ${err.message}` } })
}
})
import { fileURLToPath } from 'url'
import { dirname, join } from 'path'
const __dirname = dirname(fileURLToPath(import.meta.url))
app.use(express.static(join(__dirname, 'dist')))
app.get('{*path}', (req, res) => {
res.sendFile(join(__dirname, 'dist', 'index.html'))
})
const PORT = process.env.PORT || 3001
const server = app.listen(PORT, () => console.log(`ScholarAI server running on http://localhost:${PORT}`))
server.on('error', (err) => {
if (err.code === 'EADDRINUSE') {
console.error(`[server] Port ${PORT} is already in use. Kill the old process or use a different port.`)
} else {
console.error('[server] Failed to start:', err.message)
}
process.exit(1)
})