Feat: Add user login / logout

app/lib/jwt.ts

@@ -0,0 +1,37 @@
+import { Buffer } from "buffer"
+import { createHmac } from "crypto"
+
+const decode = (str: string):string => Buffer.from(str, 'base64').toString('binary');
+const encode = (str: string):string => Buffer.from(str, 'binary').toString('base64');
+const secret = process.env.JWT_SECRET ? process.env.JWT_SECRET : ""
+
+interface tokenData {
+  // eslint-disable-next-line
+  data: any,
+  maxAge: number
+}
+
+export function createToken({data, maxAge}: tokenData) {
+  const tokenData = data
+  tokenData.maxAge = maxAge
+  const header = encode(JSON.stringify({"alg":"HS256", "typ":"jwt"})) 
+  const body = encode(JSON.stringify(tokenData))
+  const signature = createHmac('sha256',secret).update(header + "." + body).digest('hex')
+  return header + "." + body + "." + signature
+}
+
+export function validateToken(token: string) {
+  const rawData = token.split(".")
+  const header = rawData[0]
+  const body = rawData[1]
+  const signature = rawData[2]
+
+  const calculatedSignature = createHmac('sha256',secret).update(header + "." + body).digest('hex')
+  return signature == calculatedSignature
+}
+
+export function decryptToken(token: string) {
+  const rawData = token.split(".")
+  const body = rawData[1]
+  return JSON.parse(decode(body))
+}