65 lines
2.3 KiB
Plaintext
65 lines
2.3 KiB
Plaintext
---
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// Time Trap Component //
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// This component is used to prevent bots from submitting the form.
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// It encrypts the current timestamp and stores it in a hidden input field.
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// The server then decrypts the timestamp and checks if it's valid and
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// if the time difference is within the allowed range.
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// If the timestamp is invalid, the form is not submitted.
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import crypto from 'crypto'
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import { timeTrapSecretKey } from '../lib/timeTrapSecret'
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const algorithm = 'aes-256-cbc'
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const iv = crypto.randomBytes(16) // Generate a random IV for each encryption
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const timestamp = Date.now().toString()
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const cipher = crypto.createCipheriv(algorithm, timeTrapSecretKey, iv)
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let encrypted = cipher.update(timestamp, 'utf8', 'hex')
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encrypted += cipher.final('hex')
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// Combine IV and encrypted timestamp, then encode as base64 for the input value
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const encryptedValue = Buffer.from(`${iv.toString('hex')}:${encrypted}`).toString('base64')
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// --- Time Trap Validation Start ---
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// try {
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// const algorithm = 'aes-256-cbc'
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// const decodedValue = Buffer.from(input.encTimestamp, 'base64').toString('utf8')
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// const [ivHex, encryptedHex] = decodedValue.split(':')
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// if (!ivHex || !encryptedHex) {
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// throw new Error('Invalid time trap format.')
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// }
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// const iv = Buffer.from(ivHex, 'hex')
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// const decipher = crypto.createDecipheriv(algorithm, timeTrapSecretKey, iv)
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// let decrypted = decipher.update(encryptedHex, 'hex', 'utf8')
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// decrypted += decipher.final('utf8')
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// const originalTimestamp = parseInt(decrypted, 10)
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// if (isNaN(originalTimestamp)) {
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// throw new Error('Invalid timestamp data.')
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// }
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// const now = Date.now()
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// const timeDiff = now - originalTimestamp
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// const minTimeSeconds = 2 // 2 seconds
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// const maxTimeMinutes = 60 // 1 hour
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// if (timeDiff < minTimeSeconds * 1000 || timeDiff > maxTimeMinutes * 60 * 1000) {
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// console.warn(`Time trap triggered: ${timeDiff / 1000}s`)
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// throw new Error('Invalid submission timing.')
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// }
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// } catch (err: any) {
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// console.error('Time trap validation failed:', err.message)
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// throw new ActionError({
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// code: 'BAD_REQUEST',
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// message: 'Invalid request',
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// })
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// }
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// --- Time Trap Validation End ---
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---
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<input type="hidden" name="encTimestamp" value={encryptedValue} data-time-trap class="hidden" />
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