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App icons: one icon per app, served as favicon, apple-touch-icon and web-app manifest #54

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Merged
thorwhalen merged 2 commits into from
Sep 24, 2026
Merged

App icons: one icon per app, served as favicon, apple-touch-icon and web-app manifest #54

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App icons: one icon per app, served as favicon, apple-touch-icon and …
thorwhalen Sep 24, 2026
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App icons: rewrite GET responses only (a HEAD has no body)
thorwhalen Sep 24, 2026
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25 changes: 25 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -335,6 +335,31 @@ never have to.

Every static mount (app frontends, the landing app, `mode="static"` apps, shared assets) sends `Cache-Control: no-cache` on HTML documents — including SPA fallbacks, `304` revalidations and an `html=True` `404.html` page — so browsers revalidate a page (a cheap `304` via its `ETag`) instead of heuristically reusing an old build whose HTML still names the previous asset URLs. Non-HTML assets are untouched, and a `Cache-Control` already set on a response is never overridden. The class is `enlace.frontend.RevalidatingStaticFiles` (`html_cache_control=None` opts out).

### App icons (tab, home screen, launcher)

Every app gets one icon, served in every form a browser or phone asks for:
`/_apps/{name}/icon` (as-is), `/_apps/{name}/icon-{32,180,192,512}.png`
(square PNGs, needs `pip install enlace[icons]`), and a generated
`/_apps/{name}/manifest.webmanifest`. enlace adds the matching `<link rel="icon">`,
`<link rel="apple-touch-icon">` and `<link rel="manifest">` to each app's HTML
wherever the app's own `<head>` lacks them, so the launcher tile, the browser tab
and "Add to Home Screen" (iOS and Android) all show the same image.

The icon is picked once per app: live launcher edit > `[app_meta.apps.<name>].icon`
> `<name>.png` in `[app_meta].icons_dir` > the app's own icon (from its
`<head>`, manifest or `icon.png`) > a letter monogram. An icon from the platform
tiers replaces the page's own icon links; an app's own icon only fills gaps.

```toml
[app_meta]
icons_dir = "static/app_icons" # one folder of <app>.png, owned by the platform
manifest_display = "browser" # or "standalone"
```

Home-screen icons must be raster: an app whose icon is only an SVG, emoji or
monogram gets a favicon but no PNG. `enlace.app_icons.home_screen_gaps(config)`
lists those apps.

### Deploy manifest (`/_meta`)

enlace answers "what is actually deployed?" via an always-on, cheap manifest
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7 changes: 7 additions & 0 deletions enlace/__main__.py
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Expand Up @@ -221,6 +221,13 @@ def check(
warnings: list[str] = []
for app in config.apps:
warnings.extend(validate_build(app))
from enlace.app_icons import home_screen_gaps

warnings.extend(
f"{name}: icon has no PNG form, so no home-screen icon "
"(add a PNG to [app_meta].icons_dir)"
for name in home_screen_gaps(config)
)

if json:
print(json_module.dumps({"errors": errors, "warnings": warnings}, indent=2))
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