Feat: Add user login / logout

app/lib/db.ts

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+import { PrismaClient } from '@prisma/client'
+
+const prismaClientSingleton = () => {
+  return new PrismaClient()
+}
+
+declare global { }
+
+declare const globalThis: {
+  prismaGlobal: ReturnType<typeof prismaClientSingleton>;
+} & typeof global;
+
+export const db = globalThis.prismaGlobal ?? prismaClientSingleton() // Creating a new instance of PrismaClient.

app/lib/jwt.ts

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+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))
+}

app/lib/utils.ts

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+import { clsx, type ClassValue } from "clsx"
+import { twMerge } from "tailwind-merge"
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs))
+}
+
+export function setCookie(cname: string, cvalue:string, exdays: number) {
+  if (typeof window !== "undefined") {
+    const d = new Date();
+    d.setTime(d.getTime() + (exdays*24*60*60*1000));
+    const expires = "expires="+ d.toUTCString();
+    document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
+  }
+}
+
+export function getCookie(cname: string) {
+  if (typeof window !== "undefined") {
+    const name = cname + "=";
+    const decodedCookie = decodeURIComponent(document.cookie);
+    const ca = decodedCookie.split(';');
+    for(let i = 0; i <ca.length; i++) {
+      let c = ca[i];
+      while (c.charAt(0) == ' ') {
+        c = c.substring(1);
+      }
+      if (c.indexOf(name) == 0) {
+        return c.substring(name.length, c.length);
+      }
+    }
+    return "";
+  }
+}