Content.decodeProgress
luastra/contentContent.decodeProgress(payload: string): UploadProgress
Validates a coalesced content_progress host event and returns the upload request ID, loaded bytes, and total bytes with bounded integer relationships suitable for visible progress.
Before you use it
Add luastra/content to this module's dependencies in luastra.json, then import it with require("luastra/content"). Declare content.pick for browser selection and content.upload for transfer. Upload requires a server-created intent from an authenticated declared backend function. Application code must never construct a provider URL, file path, data URL, blob URL, bucket path, or upload handle.
How it fits
Image construction and decoders are synchronous. Selection, release, upload, and cancellation return request IDs and complete through application/app resolve; progress enters application/app handle as content_progress.
When to use it
Use Content.decodeProgress in application/app handle for content_progress events, ignore request IDs that no longer own active UI state, and derive presentation without persisting the event payload.
Parameters
| Parameter | Type / values | Description |
|---|---|---|
| payload | string | Value from a content_progress host event. |
Returns
UploadProgress — the exact UploadProgress value declared by the SDK contract.
What happens next
A bounded image lifecycle that keeps local files and provider credentials outside Luau while reusing UI.Image.
Failures and fixes
Cancellation, malformed or expired handles, unsupported media types, excessive bytes or dimensions, offline transfer, authorization denial, and decode failure remain explicit branches. Release previews, request fresh display grants after UI.Image.onError, and never persist or log upload/content handles.
Availability
Private source foundation after 0.5.0-alpha; browser PNG/JPEG selection and upload are automated, while camera and native picker certification remain later evidence gates.
Focused example
local progress = Content.decodeProgress(value)