From 59a3d40e1c2027b9ee67c3264ca8be3caa18631e Mon Sep 17 00:00:00 2001
From: Mathias Wagner <germannewsmaker@gmail.com>
Date: Tue, 23 Jul 2024 00:04:07 +0200
Subject: [PATCH] Create validation.ts#signOfflineKey

---
 src/controller/validation.ts | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/controller/validation.ts b/src/controller/validation.ts
index 0124042..c587039 100644
--- a/src/controller/validation.ts
+++ b/src/controller/validation.ts
@@ -3,6 +3,7 @@ import { License } from "@models/License";
 import { mapLicense } from "@controller/license";
 import { Group } from "@models/Group";
 import { Permission } from "@models/Permission";
+import {createSign} from "node:crypto";
 
 enum ResponseStatus {
     VALID = "VALID",
@@ -39,4 +40,29 @@ export const validateLicense = async (validationKey: string, licenseKey: string)
     await License.updateOne({ _id: license.id }, { currentUses: license.currentUses + 1 });
 
     return { status: ResponseStatus.VALID, license: licenseData };
+}
+
+export const signOfflineKey = async (validationKey: string, licenseKey: string) => {
+    const license = await validateLicense(validationKey, licenseKey);
+
+    if (license.status !== ResponseStatus.VALID) return { status: license.status, message: license.message, file: null};
+
+    const project = await Project.findOne({ validationKey });
+    if (project === null) return { status: ResponseStatus.INVALID_KEY, message: "The provided validation key is invalid", file: null };
+
+    const signer = createSign("RSA-SHA256");
+
+    const renewalDate = new Date();
+    renewalDate.setDate(renewalDate.getDate() + 7); // TODO: Let the user choose the renewal date
+
+    signer.update(JSON.stringify({...license.license, renewalDate}));
+
+    const signature = signer.sign(project.privateKey, "hex");
+
+    let content = JSON.stringify({signature, data: {...license.license, renewalDate}});
+    content = Buffer.from(content).toString('base64').replace(/(.{64})/g, "$1\n");
+
+    const file = `-----BEGIN LICENSE KEY-----\n${content}\n-----END LICENSE KEY-----`;
+
+    return { status: ResponseStatus.VALID, file };
 }
\ No newline at end of file