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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe reliable pattern is a permanent application URL that resolves to a document record—not a permanent presigned URL. Give each share an opaque ID such as /share/7f3…. Your application checks authorization and revocation, selects an immutable document version, then creates a short-lived signed download URL. The visible link remains stable while storage providers, files, credentials, and delivery rules can change.
Why a presigned URL is not a permanent link
AWS and Google Cloud document presigned or signed URLs as time-limited access mechanisms. AWS states that a presigned URL remains valid only for the period specified when it is generated. AWS console links can be configured from 1 minute to 12 hours; CLI and SDK URLs can be configured for up to 7 days, although temporary credentials can make the effective lifetime shorter. Google signed URLs also require an expiration and can be used by anyone who possesses an active URL for the permitted operation.
That makes a signed URL suitable for the final download hop, not for a bookmark, email template, customer portal, or citation that must keep working. It also exposes provider-specific query parameters and couples your public API to one storage service.
The permanent-link architecture
- Create an opaque share ID. Use a cryptographically random, non-sequential value. Do not expose database integer IDs or filenames.
- Persist a share record. Store the share ID, owner or tenant, document ID, version policy, creation time, revocation state, and audit metadata.
- Keep file versions immutable. Write each generated document to a new object key or provider version. Never overwrite bytes that a pinned share is expected to preserve.
- Route the stable URL through your application. Handle
GET /share/{id}, authenticate where required, check tenancy and policy, and evaluate revocation. - Issue temporary delivery access. Return the file through your backend or redirect to a newly generated short-lived signed URL.
The browser sees one durable address while your application retains control over identity, permissions, storage, and delivery.
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Design the share record before writing code
| Field | Purpose | Typical rule |
|---|---|---|
id |
Public resolver identifier | Random, opaque, unique |
document_id |
Internal document relationship | Foreign key constrained to the owner’s tenant |
version_id |
Immutable version pin | Required for reproducible shares |
version_policy |
Defines replacement behavior | pinned or explicit latest |
revoked_at |
Stops future resolution | Null until revoked |
password_hash or audience rules |
Optional extra gate | Check before issuing download access |
created_at and audit fields |
Support investigations and lifecycle jobs | Record creator, access events, and reason codes |
Generate the ID with a secure random generator, for example a 128-bit or larger random value encoded as URL-safe text. Unpredictability is not a replacement for authorization: a leaked active link must still be revocable and, where appropriate, protected by an account, password, or audience policy.
Pinning a version versus sharing “latest”
Pinned version
A pinned share always resolves to one immutable object. It is the right choice for invoices, signed reports, legal records, build artifacts, and anything that must remain byte-for-byte reproducible. Google Cloud Storage describes objects as immutable during their storage lifetime; replacing an object creates a new generation number. Store that generation (or your provider’s equivalent) with the share.
Latest version
A latest share resolves the current published version each time it is opened. The URL stays stable, but the bytes can change. Make this behavior explicit in the record and user interface: label it “always latest,” show the current revision date, and warn consumers not to use it as a permanent citation.
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Do not silently change a pinned share into latest, or vice versa. If a user needs both, create two records with different policies.
Reference implementation
Database example
CREATE TABLE document_shares (
id text PRIMARY KEY,
tenant_id text NOT NULL,
document_id text NOT NULL,
version_id text,
version_policy text NOT NULL CHECK (version_policy IN ('pinned','latest')),
revoked_at timestamptz,
created_at timestamptz NOT NULL DEFAULT now(),
created_by text NOT NULL,
CHECK (version_policy = 'latest' OR version_id IS NOT NULL)
);
Resolver pseudocode
GET /share/:id
share = db.findShare(id)
if share is null or share.revoked_at is not null:
return 404
authorize(request, share.tenant_id, share.audience_rules)
version = share.version_policy == 'pinned'
? documents.getVersion(share.document_id, share.version_id)
: documents.getPublishedVersion(share.document_id)
if version is null:
return 410
signed = storage.createSignedGet(version.object_key, expiresIn=300)
audit.log('share_download_authorized', share.id, version.id)
return redirect(signed, 302)
Use a short delivery lifetime such as five minutes according to your threat model. A redirect is simple and lets object storage or a CDN serve large files efficiently. Streaming through your application gives tighter control over headers, logging, and range requests but consumes application bandwidth.
Authorization, privacy, and revocation
Authorize before signing
Anyone holding an active Google signed URL can use it for the allowed operation during its validity window. Therefore, perform tenant, account, password, audience, and policy checks at the stable resolver before generating a delivery URL. Never make the object bucket publicly readable merely to simplify sharing.
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Revoke without breaking unrelated links
Set revoked_at and have the resolver reject the share. This is immediate for new requests; a delivery URL already issued remains usable until its short expiration. If emergency invalidation of already issued URLs is required, remove or quarantine the object, rotate the relevant signing credentials, or apply a storage/CDN deny rule, balancing those actions against other links that use the same credentials or object.
Prevent leakage
- Keep provider signatures out of the permanent URL and avoid logging them at the application edge.
- Use HTTPS, restrictive referrer policy, and download responses that set an appropriate
Content-Disposition. - Record successful and denied resolutions, but redact passwords and signed query strings.
- Use a separate share namespace per tenant and enforce tenant ownership in every lookup.
CDN signed URLs and storage portability
CloudFront signed URLs can add delivery controls such as IP restrictions. They remain an access-control layer, not a permanent identity. Use them only for the delivery hop when edge caching, geographic distribution, or network restrictions justify the extra policy. Keep your application share ID independent so you can move between S3, Google Cloud Storage, or another provider without changing published links.
Failure modes and fixes
| Symptom | Likely cause | Fix |
|---|---|---|
| Link works for a day, then fails | The presigned URL was published directly | Publish /share/{id} and mint delivery URLs on demand |
| Revoked link still downloads briefly | A previously issued signed URL is active | Shorten TTL; remove the object or rotate credentials for emergency invalidation |
| Old document changed unexpectedly | The share points to latest or an object was overwritten | Pin a provider version or immutable key and prohibit overwrites |
| Share exposes another tenant’s file | Lookup checked only the public ID | Enforce tenant and ownership predicates before signing |
| Valid share returns 404 | Record was deleted, malformed, or hidden by an authorization policy | Check ID encoding, database status, tenant context, and audit logs; return 410 when the version is permanently gone |
| Large downloads overload the app | Backend streams every byte | Redirect to a short-lived storage/CDN URL and support range requests |
Operational checklist
- Use random, non-sequential IDs and a uniqueness constraint.
- Decide pinned versus latest at creation and display that policy.
- Store immutable object keys or provider generation/version IDs.
- Check revocation, tenancy, audience, and optional password before signing.
- Keep signed delivery URLs short-lived and out of permanent links.
- Log resolver decisions and version IDs without logging secrets.
- Test replacement, revocation, expired delivery URLs, credential expiry, and provider outages.
- Define retention and deletion behavior for both share records and file versions.
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Frequently Asked Questions
Should a public share ID contain the document filename?
No. Keep filenames and internal identifiers out of the URL; use an opaque random ID and supply a safe download filename in the response headers.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteCan I extend one signed URL forever by choosing a very large expiration?
No. Provider credentials, service limits, and security exposure still apply. Resolve a stable application ID and issue fresh short-lived access instead.
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What HTTP status should a deleted share return?
Use 404 when you do not want to reveal whether an ID ever existed; use 410 when the resource was known but permanently removed and that distinction is useful to your clients.
The Bottom Line
A permanent document link is a stable, authorized resolver that points to an immutable version. Presigned URLs belong behind that resolver as short-lived delivery credentials.
Quick Recap
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