Chungus 2.0

server/private/routers/auth/transferSession.ts

@@ -0,0 +1,128 @@
+/*
+ * This file is part of a proprietary work.
+ *
+ * Copyright (c) 2025 Fossorial, Inc.
+ * All rights reserved.
+ *
+ * This file is licensed under the Fossorial Commercial License.
+ * You may not use this file except in compliance with the License.
+ * Unauthorized use, copying, modification, or distribution is strictly prohibited.
+ *
+ * This file is not licensed under the AGPLv3.
+ */
+
+import HttpCode from "@server/types/HttpCode";
+import { NextFunction, Request, Response } from "express";
+import createHttpError from "http-errors";
+import { z } from "zod";
+import { fromError } from "zod-validation-error";
+import logger from "@server/logger";
+import { sessions, sessionTransferToken } from "@server/db";
+import { db } from "@server/db";
+import { eq } from "drizzle-orm";
+import { response } from "@server/lib/response";
+import { encodeHexLowerCase } from "@oslojs/encoding";
+import { sha256 } from "@oslojs/crypto/sha2";
+import { serializeSessionCookie } from "@server/auth/sessions/app";
+import { decrypt } from "@server/lib/crypto";
+import config from "@server/lib/config";
+
+const bodySchema = z.object({
+    token: z.string()
+});
+
+export type TransferSessionBodySchema = z.infer<typeof bodySchema>;
+
+export type TransferSessionResponse = {
+    valid: boolean;
+    cookie?: string;
+};
+
+export async function transferSession(
+    req: Request,
+    res: Response,
+    next: NextFunction
+): Promise<any> {
+    const parsedBody = bodySchema.safeParse(req.body);
+
+    if (!parsedBody.success) {
+        return next(
+            createHttpError(
+                HttpCode.BAD_REQUEST,
+                fromError(parsedBody.error).toString()
+            )
+        );
+    }
+
+    try {
+        const { token } = parsedBody.data;
+
+        const tokenRaw = encodeHexLowerCase(
+            sha256(new TextEncoder().encode(token))
+        );
+
+        const [existing] = await db
+            .select()
+            .from(sessionTransferToken)
+            .where(eq(sessionTransferToken.token, tokenRaw))
+            .innerJoin(
+                sessions,
+                eq(sessions.sessionId, sessionTransferToken.sessionId)
+            )
+            .limit(1);
+
+        if (!existing) {
+            return next(
+                createHttpError(HttpCode.BAD_REQUEST, "Invalid transfer token")
+            );
+        }
+
+        const transferToken = existing.sessionTransferToken;
+        const session = existing.session;
+
+        if (!transferToken) {
+            return next(
+                createHttpError(HttpCode.BAD_REQUEST, "Invalid transfer token")
+            );
+        }
+
+        await db
+            .delete(sessionTransferToken)
+            .where(eq(sessionTransferToken.token, tokenRaw));
+
+        if (Date.now() > transferToken.expiresAt) {
+            return next(
+                createHttpError(HttpCode.BAD_REQUEST, "Transfer token expired")
+            );
+        }
+
+        const rawSession = decrypt(
+            transferToken.encryptedSession,
+            config.getRawConfig().server.secret!
+        );
+
+        const isSecure = req.protocol === "https";
+        const cookie = serializeSessionCookie(
+            rawSession,
+            isSecure,
+            new Date(session.expiresAt)
+        );
+        res.appendHeader("Set-Cookie", cookie);
+
+        return response<TransferSessionResponse>(res, {
+            data: { valid: true, cookie },
+            success: true,
+            error: false,
+            message: "Session exchanged successfully",
+            status: HttpCode.OK
+        });
+    } catch (e) {
+        console.error(e);
+        return next(
+            createHttpError(
+                HttpCode.INTERNAL_SERVER_ERROR,
+                "Failed to exchange session"
+            )
+        );
+    }
+}