Brazen Framework - Download Manager

Cross-tab download queue, resolution pipeline, and immediate downloads for Brazen user scripts

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Δημιουργός: brazenvoid
Έκδοση: 1.0.0
Δημιουργήθηκε την: 15/07/2026
Ενημερώθηκε την: 15/07/2026
Μέγεθος: 100 KB
Άδεια: GPL-3.0-only

Brazen Framework — Download Manager (developer guide)

Cross-tab batch downloads, page resolution, immediate GM_download orchestration, optional tag discovery review, and human-interaction rate-limit handling. Apps extend BrazenFramework, call configureDownloadManager() after configureDock(), and @require this module after Framework core.

Greasy Fork: Download Manager · Requires: Framework core, IndexedDB Storage (v1.1.0+ download queue stores) · Grant on this module: GM_download

When to use / when not to use

Use when your app needs cross-tab download queues, search-tile selection enqueue, media-page immediate download, token-based paths, duplicate-ledger integration, or tag-discovery review before filenames are built.
Do not use for a single fire-and-forget GM_download with no queue, no cross-tab state, and no path tokens — that is rare; most Brazen apps still benefit from ledger + path helpers here.
Requires a dock — configureDownloadManager() throws if configureDock() was not called first.
Requires IndexedDB — queue rows and shared state live in IDB via Configuration Manager repositories; when IDB is blocked, persistence gates apply.

Quick start

Load order (after Framework core):

// @require … Brazen Framework - Framework.js
// @require … Brazen Framework - Download Manager.js

In the app constructor (after configureDock):

this.configureDock({ orientations: ['right'], scriptName: 'My App', showBranding: true })

this.configureDownloadManager({
  enableConfigKey: 'enable-download-manager',
  downloadPaths: {
    folderConfigKey: 'download-folder',
    filenamePatternConfigKey: 'filename-pattern',
    subfolderPatternConfigKey: 'subfolder-pattern',
    defaultFolder: 'my-downloads',
    getPatternResolver: () => ({
      chips, tagTypes, ignore, substitutions, unknownDefault,
    }),
    extractMediaData: (el) => ({ id, md5, ext }),
    extractTagGroups: () => ({ author: [], character: [], general: [] }),
    extractTagIncidences: () => ({ 'tag name': 12 }), // optional; discovery panel counts
    appendExtension: true,
    nameFallback: (data) => data.id || 'media',
  },
  pages: {
    search: {
      roles: ['selection'],
      itemSelector: 'span.thumb',
      resolveItem: (item) => ({ itemId, sourceUrl }),
      setItemProgress: (item, progress) => { /* optional tile overlay */ },
    },
    media: {
      roles: ['enqueueMedia', 'immediateDownload'],
      defaultDownloadType: 'post',
    },
  },
  downloadTypes: {
    post: {
      resolveFromSearch: (ctx) => ({ nextUrl: ctx.sourceUrl }),
      resolveFromMedia: (doc, ctx) => ({ mediaUrl, tagGroups, downloadId, data }),
    },
  },
  getQueueItemId: (ctx) => ctx.itemId,
  resolutionInitiationGapMs: 2000,
  downloadInitiationGapMs: 2000,
})

BrazenDownloadManager.initialize() runs from Framework init() after Configuration Manager setup.

Configuration shape

Top-level keys

Key	Role
`enableConfigKey`	Flag field key for Enable Download Manager (auto-registered unless `enabled: true`)
`enableDefault`	Default for enable flag when auto-registered
`enabled`	When `true`, skip enable-flag registration and treat manager as always on
`downloadPaths`	Path/token extraction and pattern resolver (see below)
`pages`	Named page configs with `roles` (see below)
`downloadTypes`	Per-type resolution handlers (`resolveFromSearch`, `resolveFromMedia`, …)
`getQueueItemId`	`(context) => string` stable queue id
`resolutionInitiationGapMs`	ms between resolution fetches (default `2000`)
`downloadInitiationGapMs`	ms between `GM_download` calls (default `2000`; replaces Framework `downloadsDelay`)
`tagDiscovery`	Optional review panel config (see below)
`rateLimitHandlers`	Per-context rate-limit strategies (see below)

`downloadPaths`

Key	Role
`folderConfigKey` / `filenamePatternConfigKey` / `subfolderPatternConfigKey`	Configuration Manager keys for folder and patterns
`defaultFolder`	Fallback root folder
`getPatternResolver`	`() => { chips, tagTypes, ignore, substitutions, unknownDefault, … }` — tag-type tokens use registry attributes when `TagRuntime` is warmed
`extractMediaData(el)`	Metadata object for pattern chips (`id`, `md5`, `ext`, …)
`extractTagGroups()`	`{ typeKey: string[] }` tag lists for path tokens
`extractTagIncidences()`	Optional `{ tagName: count }` map for discovery panel incidence meta
`appendExtension`	Append `data.ext` to filename when set
`nameFallback(data)`	When pattern resolves empty

Path helpers (buildDownloadPathFromPatterns, buildDownloadPath, sanitizePathSegment, substitution parse/map) live on the manager instance — use getDownloadManager() from the app.

`pages` and roles

Each pages[pageName] entry:

Key	Role
`roles`	Capability flags for the active page (see table)
`itemSelector`	Search tiles for selection mode
`resolveItem(item)`	`{ itemId, sourceUrl, … }` for enqueue
`defaultDownloadType`	Fallback type key for media enqueue
`setItemProgress(item, progress)`	Optional hook for per-tile pipeline UI

Role	Enables
`selection`	Selection mode + click-to-enqueue on search tiles
`enqueueMedia`	Media-page add/remove queue toggle
`immediateDownload`	`downloadImmediate()` on media pages
`tagDiscoveryToggle`	Dock tag-discovery mode button

Query with isDownloadPageRole('selection') (delegated on Framework).

`tagDiscovery` (optional)

Key	Role
`discoverAt`	Steps that scan pattern-relevant types, e.g. `['resolution', 'immediate']`
`tagTypes`	Panel grouping: `{ label, rowClass, color }` per type — colors via View Layer `applyTagDiscoveryTypeColors`
`panel`	Extra options forwarded to `renderTagDiscoveryPanelContent` (section labels, `groupOrder`, …)
`actions`	Incidence options for tag-attribute buttons (`buildUrl`, field keys, CSS, explore gate) — framework owns button chrome
`isTagKnown(tagName)`	Optional override; default checks tag registry

When discovery is on, unknown tags block the pipeline and open #bv-tag-discovery-panel. Confirm promotes types; Skip drops the item without confirming; Open media opens the source URL. State fields discoveryPanelTags and discoveryPanelKnownTags persist in downloadManagerState.

`rateLimitHandlers`

Keyed by context (resolution, download, …). Each context may define:

Handler	Role
`humanInteraction`	`{ detect(ctx), openUrl?(ctx), confirmTitle?, confirmMessage?, confirmLabel?, reopenLabel? }` — opens verification tab (`brazen_hi=1`), sets `humanInteractionBlocked` + `humanInteractionOpenUrl`, shows processor-leader panel. Runs before `timedReload`.
`timedReload`	`{ detect(doc, ctx), reloadDelayMs? }` — document `detect` only (not bare HTTP 429)

reopenLabel defaults to Reopen verification tab on the human-interaction panel. humanInteractionOpenUrl is stored in shared DM state for Reopen.

Initiation gaps

resolutionInitiationGapMs and downloadInitiationGapMs pace resolution fetches and GM_download respectively. Download pacing uses an in-tab clock hydrated from lastDownloadInitiationAt in shared state so concurrent IDB writes cannot erase the gap.

Public API

Framework delegates most calls; you can also use this.getDownloadManager() for path helpers.

Queue and download

Method	Role
`downloadImmediate({ mediaElement, removeMediaOnSuccess?, source? })`	Immediate download; registers path tags; optional discovery gate
`enqueueDownload(context)`	Add to resolution queue; returns whether added
`dequeueDownload(itemId)`	Remove from either queue
`isQueued(itemId)`	Cross-tab pipeline membership
`toggleDownloadManagerPaused()`	Start/pause download queue only; no-op when download pending is 0
`clearDownloadQueue()`	Wipe download queue only; clears download-context human-interaction block
`toggleCurrentMediaQueued()`	Media-page enqueue toggle
`toggleSelectionMode()`	Local session selection mode (search)

Tag discovery

Method	Role
`confirmTagDiscoveryMappings()`	Confirm types; promote resolution item or run pending immediate
`skipTagDiscoveryInclusion()`	Skip review — drop item, do not confirm types
`openTagDiscoveryMedia()`	Open media URL for item under review
`toggleTagDiscoveryMode()`	Cross-tab discovery enable toggle

Progress and status

Method	Role
`getDownloadManagerProgress()`	`{ resolution: {current, total}, download: {current, total} }`
`getDownloadQueueCount()`	Dock counter; excludes resolution queue when discovery mode is on
`getPendingPipelineCount()`	Non-terminal items in both queues
`isDownloadManagerEnabled()`	Enable flag + dock active
`isDownloadPageRole(role)`	Page role gate
`isDownloadManagerLeaderTab()`	This tab owns `processingTabId`
`isDownloadManagerRunning()`	Pipeline active (queues, blocked state, or in-tab processing)

Human interaction

Method	Role
`BrazenDownloadManager.peekHumanInteractionBlockedMirror(scriptPrefix)`	Static. Sync `localStorage` mirror — usable in Phase-1 page ops before `initialize()`
`isHumanInteractionBlockedSync()`	Instance: IDB state `humanInteractionBlocked`

Path and substitution helpers (`getDownloadManager()`)

Method	Role
`buildDownloadPathFromPatterns(data, tagGroups)`	Token path assembly
`buildDownloadPath(folder, name)`	Sanitized folder + filename
`sanitizePathSegment(segment)`	Illegal char strip + entity decode
`decodeHtmlEntities(text)`	DOM textarea decode
`parseDownloadTagSubstitutionLines(lines, normalizeToken)`	Substitution parser
`buildDownloadTagSubstitutionMap(rules)`	`Map<subject, replacement>`

Processors and leadership

One leader tab (processingTabId) runs resolution then download loops when not blocked.

Behaviour	Detail
`paused`	Pauses the download queue only. Resolution auto-runs on enqueue. Start/Pause disabled when download queue is empty. When download queue drains to 0, `paused` returns to `true`.
Leadership	Heartbeat `processingHeartbeatAt` (~3 s) + sync `localStorage` mirror. Stale steal ~12 s or immediate after `pagehide` mirror clear. Steal requeues in-flight `resolving` / `downloading` rows.
Claims	Items move `queued` → `resolving` / `downloading` before work; in-tab lock is synchronous before any `await`.
Ledger	Duplicate claim at download time in Download Manager when Skip or Hide is on; `ledgerClaimed` on download rows prevents double-claim after lock steal.
UI cadence	Queue/state puts do not rebuild dock; one UI reset per resolution/download task. Full `_syncFromStorage` on init, enqueue, Start, tab focus.

Tag discovery UI

Scans pattern-relevant tag types only. Always registers path tags via _registerResolvedTagGroups (discovery on → seen-only; off → confirm as typeEntryId). Panel lists unknown then known tags with incidence counts; framework maps tag-attribute actions internally. Reload / tab focus restores panel when review pending.

Human-interaction panel

Shown only on the processor-leader tab when humanInteractionBlocked. Verification tab stays silent (brazen_hi=1 + mirror). Done — resume clears block; Reopen uses humanInteractionOpenUrl. Cross-tab enqueue while blocked still writes queued rows; processors resume after confirm.

Integration notes

Topic	Detail
Grant	`@grant GM_download` on this module (and typically on the app too)
Load order	After Framework core; before app script
Dock	Manager registers dock fields (selection, enqueue, start/pause, clear, progress, discovery). Apps `pushField` enable key on the rail.
Ledger	Constructor `downloadDuplicateLedger` on Framework; claims happen in Download Manager — see Framework developer guide
View Layer	Progress slot, selection marks, item progress overlays, discovery/human-interaction panels — View Layer
IndexedDB	`downloadResolutionQueue`, `downloadQueue`, `downloadManagerState` — IndexedDB Storage

Public API reference (index)

Setup: configureDownloadManager, getDownloadManager
Queue: downloadImmediate, enqueueDownload, dequeueDownload, isQueued, toggleDownloadManagerPaused, clearDownloadQueue, toggleSelectionMode, toggleCurrentMediaQueued
Discovery: confirmTagDiscoveryMappings, skipTagDiscoveryInclusion, openTagDiscoveryMedia, toggleTagDiscoveryMode
Status: getDownloadManagerProgress, getDownloadQueueCount, isDownloadPageRole, isDownloadManagerEnabled, isDownloadManagerLeaderTab, peekHumanInteractionBlockedMirror, isHumanInteractionBlockedSync
Paths: buildDownloadPathFromPatterns, parseDownloadTagSubstitutionLines, buildDownloadTagSubstitutionMap, buildDownloadPath