feat: build the CookieAuthentication class

src/lib/blog/auth/CookieAuthentication.ts

@@ -0,0 +1,38 @@
+import type { Cookies } from "@sveltejs/kit";
+
+export class CookieAuthentication {
+
+  private readonly cookieValue: string;
+  private readonly cookieValueArray: string[];
+  public static cookieName = 'auth'
+  public static adminAuthRole = 'admin'
+
+  constructor(
+    private readonly cookies: Cookies,
+  ){ 
+    this.cookieValue = this.cookies.get(CookieAuthentication.cookieName) ?? ''
+    this.cookieValueArray = this.cookieValue.split(',')
+  }
+
+  public get isAuthdAsAdmin(): boolean {
+    let isAuthdAsAdmin = false;
+
+    if (this.cookieValueArray.includes(CookieAuthentication.adminAuthRole)) {
+      isAuthdAsAdmin = true
+    }
+
+    return isAuthdAsAdmin
+  }
+
+  public setAdminAuthentication(isAuthd: boolean) {
+    let value = this.cookieValue
+
+    if (isAuthd) {
+      value = Array.from(new Set([...this.cookieValueArray, CookieAuthentication.adminAuthRole])).join(',')
+    } else {
+      value = this.cookieValueArray.filter((i) => i !== CookieAuthentication.adminAuthRole).join(',')
+    }
+
+    this.cookies.set(CookieAuthentication.cookieName, value, { path: '/'})
+  }
+}