Add timestamp-based expiration to admin API requests

[sshdopey]

What

The Bearer token has no expiry mechanism. An intercepted token is valid forever. There is no way to revoke or time-limit access.

Why

If a token is leaked, it remains valid indefinitely. Adding request-level expiration limits the window of exposure.

Scope

• Add X-Request-Timestamp header requirement for admin requests
• Reject requests older than a configurable window (e.g., 5 minutes)
• Log rejected requests for security monitoring
• Make the window configurable via env var

Acceptance Criteria

• Admin requests without X-Request-Timestamp are rejected (or allowed with warning)
• Requests older than ADMIN_REQUEST_MAX_AGE_MS are rejected with 401
• Default window: 5 minutes
• Timestamp validation is timing-safe

Technical Context

• src/routes/admin.ts:9-16 — auth middleware
• New env var: ADMIN_REQUEST_MAX_AGE_MS (default: 300000)

[Akeem0604]

@Akeem0604 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello developer, having read those requirements, these are what I have as an expert, I would really be happy if you assign me with those issues to work on them.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Akeem0604 to this issue.

[Sheebazz]

@Sheebazz has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi Maintainer, I’ve reviewed the issue and I’d like to work on it. I can add the timestamp validation to the admin auth flow, keep the expiry window configurable, and make sure expired or invalid requests are handled safely.

I’ll also cover the missing, expired, and valid timestamp cases with tests and make sure the security logging is included.

Please consider assigning this issue to me. Thank you.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Sheebazz to this issue.

[drips-wave]

Congratulations, @Sheebazz! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Sheebazz: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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