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Separate the asset, original, derivatives, and upload URL
Model these as distinct things:
- Logical asset: an application-level record with a durable opaque ID, ownership, status, and revision. Attach its ID or revision reference to the product.
- Original: the accepted source binary, stored under a storage key and, where applicable, a storage version.
- Derivative: a rendition identified by the source revision and transformation parameters, such as dimensions or format.
- Upload capability: a short-lived presigned URL that authorizes a particular transfer. It is not a durable asset ID or a permanent delivery URL.
Resolve the asset identity to a delivery URL when the product is read. This avoids tying product data to a temporary upload URL or to a storage location that may change. Adobe Commerce documents a related approach: after its upload flow, the entity uses a returned hashed key rather than a URL or full S3 path (Adobe Commerce REST upload documentation; Adobe Commerce GraphQL upload documentation). This is a platform-specific example, not a guarantee for every commerce system.
Choose when to create thumbnails
| Decision factor | Upload-time (eager) | On-demand |
|---|---|---|
| First storefront request | Expected variants can be ready before they are requested. | A missing variant may require generation on its first request. |
| Variant demand | Fits a predictable, commonly reused set of sizes. | Fits variable dimensions or variants that may never be requested. |
| Storage and processing | Creates work and storage for each generated size, including unused ones. | Can avoid storing unused variants, while requiring generation when a new variant is first requested. AWS describes this potential storage benefit in its on-the-fly resizing example (AWS Serverless Image Handler architecture). |
| Operational focus | Requires managing background processing, retries, and readiness state if generation is asynchronous. | Requires a delivery path that can generate and cache missing renditions. |
Neither approach is universally faster or cheaper. Compare first-view latency, how often each variant is reused, derivative storage, invalidation complexity, and operational burden against your image mix and traffic. The cited examples do not provide an apples-to-apples cost or latency benchmark.
Use a staged upload and finalization flow
- Authorize: have the application authorize an upload to a specific temporary key and return the short-lived upload capability the client needs.
- Transfer: where supported, let the client upload directly to object storage instead of routing the media payload through the commerce application.
- Verify and validate: confirm upload completion, inspect the actual content, and apply the application’s acceptance rules before making the image available.
- Finalize identity: promote or copy the accepted source to durable storage, create the asset record and revision, and attach that reference to the product.
- Create renditions: eagerly generate the expected sizes or enqueue them. With on-demand generation, create a missing rendition at delivery time and cache it.
Adobe Commerce’s documented REST flow uses initiation, direct upload to a temporary S3 location, and finish-upload; the returned hashed key is then used as an entity attribute rather than a URL or full S3 path (Adobe Commerce REST upload documentation). Its GraphQL documentation also describes moving a temporary object into permanent storage (Adobe Commerce GraphQL upload documentation). Treat these as examples of a staged lifecycle, not as universal API behavior.
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Make replacement and cache invalidation explicit
A storage key alone may not identify one permanent version of an image. AWS says that uploading with a presigned URL to an existing S3 key replaces that object, and that the URL can be used multiple times until it expires (AWS: presigned URLs). Decide whether a replacement is a new revision of the same logical asset or a new asset, then ensure old derivatives and caches cannot be mistaken for the new source.
Two practical storage patterns are immutable object keys per accepted revision, or versioned storage with the relevant version recorded. In an S3 versioned bucket, an overwrite creates another version while preserving the older one (AWS: S3 Versioning). Tie derivative identity and cache keys to the source revision (or content identity) plus transformation parameters. That way, changing a source does not silently return a thumbnail produced from an earlier revision.
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Protect the upload and verify the content
A presigned URL is a bearer capability: anyone who obtains it may use the permissions it grants until it expires. AWS notes that its effective permissions are constrained by the signer’s permissions and that it can be used multiple times before expiry (AWS: presigned URLs).
- Limit the URL’s lifetime to what the expected transfer needs.
- Constrain the upload to the intended key and method, and avoid logging or exposing the full URL.
- Validate the uploaded content on the server before publication; do not treat a successful transfer as proof that the file is acceptable.
- Where supported, use the documented checksum mechanisms for SigV4 presigned uploads to help verify transfer integrity (AWS: presigned URLs).
Prevent event-driven processing loops
S3 event notifications can start thumbnail processing. If the processor writes derivatives into a bucket that also triggers the same handler, filter notifications to exclude processed outputs or place originals and derivatives in separate buckets or prefixes. AWS explicitly warns about filtering processed images to avoid an infinite processing loop (AWS Lambda: Using an S3 trigger).
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Make the processing handler idempotent so duplicate notifications or retries do not leave inconsistent derivative records. Keep upload completion separate from derivative readiness when work is asynchronous: expose a processing status and define retry behavior, rather than treating the first successful upload as proof that every thumbnail is ready.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Adobe Commerce as one implementation example
Adobe Commerce as a Cloud Service documents presigned S3 uploads for media, and its product-file documentation describes files attached through product attributes and stored in S3 media storage (Adobe Commerce product file attributes). Availability and behavior depend on the Adobe product and deployment; do not assume this exact flow is available in every Adobe Commerce installation or other commerce platform.
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