fix: added variables to the constants file.

fix: updated sql queries with constants

lib/auth-tokens.js

@@ -0,0 +1,14 @@
+const crypto = require('crypto')
+
+const constants = require('./constants')
+
+function createAuthToken (userID, type) {
+  const token = crypto.randomBytes(32).toString('hex')
+  const sql = `INSERT INTO auth_tokens (token, type, user_id) VALUES ($1, $2, $3) ON CONFLICT (user_id, type) DO UPDATE SET token=$1, expire=now() + interval '${constants.AUTH_TOKEN_EXPIRATION_TIME}' RETURNING *`
+
+  return db.one(sql, [token, type, userID])
+}
+
+module.exports = {
+  createAuthToken
+}