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Author SHA1 Message Date
fb13ff4fd8 feat(browse): generic directory listing tool — default at folder URLs
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A new HTML tool — browse — that lists the contents of any directory.
Designed for ZDDC archives but no ZDDC-specific filtering; just a
straight folder browser with expand/collapse, sort, and name filter.

Modes (auto-detected at page load):
  - Online: when served by zddc-server at a folder URL, queries
    the same URL with Accept: application/json to load the listing
    and renders it. Auto-served as the default at any directory
    under ZDDC_ROOT without an index.html (replacing the previous
    minimal-HTML stub from directory.go).
  - Local: 'Select Directory' button uses FileSystemAccessAPI to
    pick any folder on disk; works in Chromium-based browsers.

Features (Phase 1 — what's in this commit):
  - Tree view with lazy-loaded folders (children fetched on first
    expand).
  - Sort by name / size / extension / date (column header click).
  - Filter by name substring (toolbar input).
  - File click opens in a new tab — for server-backed pages,
    routes through zddc-server's normal handler so .archive
    redirects + apps cascade overrides + ACL all apply.

Phase 2 deferred:
  - ZIP files inline expansion (treat archive entries as virtual
    children).
  - File preview popup (reuse shared/preview-lib.js).
  - Extension multi-select filter.

Wiring:
  - browse/ added to top-level ./build's per-tool list, embed
    block, versions.txt, and the lockstep release commit + tag set.
    All seven tools (archive, transmittal, classifier, mdedit,
    landing, form, browse) advance together on stable cuts.
  - shared/build-lib.sh: browse added to ZDDC_RELEASE_TOOLS and
    verify_channel_links's per-tool loop.
  - zddc/internal/apps/embed.go: //go:embed browse.html +
    EmbeddedBytes("browse") case.
  - zddc/internal/apps/availability.go: browse available at every
    directory (same as archive).
  - zddc/internal/apps/handler.go: MatchAppHTML routes
    /<dir>/browse.html → 'browse'.
  - zddc/internal/handler/directory.go: when a directory request
    arrives with Accept: text/html and no index.html exists,
    serve the embedded browse.html bytes (with a JSON-fallback
    if the embedded slot is empty during bootstrap).
2026-05-03 19:56:51 -05:00
8b6a2dc3e3 feat(zddc-server): apps fetch+cache subsystem with cascade overrides
Adds internal/apps/ package serving the five tool HTMLs at virtual paths
based on the surrounding folder name convention:

  archive      every directory (multi-project, project, archive, vendor)
  classifier   any Incoming/Working/Staging directory and subtree
  mdedit       any Working directory and subtree
  transmittal  any Staging directory and subtree
  landing      only at deployment root

The current-stable build of every tool is //go:embed'd into the binary
at compile time — that's the default with zero config. Operators
override per-directory via .zddc apps: entries; closer-to-leaf wins.

Spec syntax (in any apps: value):

  stable / beta / alpha / :stable          channel
  v0.0.4 / v0.0 / v0 / :v0.0.4              version
  https://my-mirror/releases                URL prefix only
  https://my-mirror/releases:beta           URL prefix + channel
  https://my-fork/archive.html              terminal full URL
  ./local.html / /abs/path.html             terminal local path

The special apps.default key provides a baseline URL prefix and channel
inherited by any app not overridden per-name. Per-axis cascade: a deeper
.zddc can override the URL, the channel, or both.

Cascade walks root→leaf; default applies first at each level, then the
per-app entry. Terminal sources (paths and full .html URLs) short-circuit
composition; deeper non-terminal entries override parent terminals.

URL sources fetch once on first request and cache forever in
<ZDDC_ROOT>/_app/<host>/<path> — different upstreams with the same
filename stay distinct. No background refresh, no SHA-256 verification:
operators delete the cache file to force a refetch. Concurrent misses
for the same source dedupe via a 30-line hand-rolled singleflight.

Per-request override: any user can append ?v=<spec> to a tool URL
(e.g. ?v=beta, ?v=v0.0.4, ?v=:alpha, ?v=https://mirror/releases:beta)
to ask for a different build for one request. Security: ?v= serves
ONLY versions already in the cache (cache miss returns 404; path
sources are rejected outright with 400). Users cannot trigger
arbitrary upstream fetches via crafted URLs.

Failed URL fetches (network down, 5xx) fall back to embedded with a
one-time WARN log. The X-ZDDC-Source response header reports what
served: fetch:URL / cache:URL / path:/abs / embedded:<app>@<build>.

Wire-in (cmd/zddc-server/main.go): dispatch routes <dir>/<app>.html
through apps.MatchAppHTML + AppAvailableAt + apps.Server.Serve when
no real file exists. Direct URL access to /_app/... is blocked at
the dispatch layer — cached files must go through the apps resolver
so they get correct Content-Type and ACL gating.

Schema (internal/zddc/file.go): ZddcFile gains Apps map[string]string
for cascade overrides. Validator (internal/zddc/validate.go) accepts
the special "default" key alongside the five canonical app names and
all spec forms.

Removes ZDDC_APPS_* env vars (no admin UI, no refresh interval, no
upstream allow-list — the simpler model has fewer knobs).

40+ unit tests across the new package: parser shapes, cascade
resolution with default+per-app interactions, terminal short-circuit
semantics, ?v= cache-only enforcement, embedded fallback, atomic
cache writes, singleflight dedup. Plus end-to-end dispatch tests in
cmd/zddc-server/main_test.go.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-01 15:25:25 -05:00