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feat(theme+comments): runtime colour theme and COMMENTS_ENABLED switch

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Colour theme is configurable at runtime from two seed colours (brand + accent);
neutrals stay fixed for contrast safety. Tailwind v4 var()-based tokens let a
:root:root override recolour everything with no rebuild; the 50->950 ramps are
derived via a color-mix ladder. Config lives in the DB config table (admin UI:
Config > Farbschema, presets + custom pickers + live preview), served on the public
/event endpoint with env defaults (THEME_PRESET/PRIMARY/ACCENT), propagated live via
event-updated SSE, and cached in localStorage for a no-flash boot. The keepsake export
mirrors the same ladder in Rust so offline archives match the event theme.

COMMENTS_ENABLED (env, default true) is a boot-time kill-switch: the backend rejects
new comments with 403 and the frontend hides the comment button (feed card) and
panel/composer (lightbox). Existing comments stay in the DB, hidden, and return when
re-enabled.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
MechaCat02
2026-07-19 15:21:55 +02:00
parent 6e0a760271
commit 57a907eca5
12 changed files with 765 additions and 99 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
backend/src/handlers/admin.rs
View File

@@ -138,10 +138,27 @@ pub async fn patch_config(
"storage_quota_enabled",
"upload_count_quota_enabled",
];
const TEXT_KEYS: &[&str] = &["privacy_note"];
const TEXT_KEYS: &[&str] = &[
"privacy_note",
"theme_preset",
"theme_primary",
"theme_accent",
];
const PRIVACY_NOTE_MAX_LEN: usize = 16 * 1024; // 16 KiB free text is plenty
// Preset ids the frontend knows how to render (mirror of PRESETS in
// frontend/src/lib/theme/palette.ts). "custom" means "use the theme_primary/accent
// seeds verbatim". Kept in sync by hand — a new preset must be added in both places.
const THEME_PRESETS: &[&str] = &[
"champagne-gold",
"rose",
"sage",
"dusk-blue",
"classic-silver",
"custom",
];
let mut privacy_note_changed = false;
let mut theme_changed = false;
// Validate every key first so a bad value in the batch can't leave a partial
// update behind — validation must fully precede any write.
@@ -186,8 +203,23 @@ pub async fn patch_config(
"Wert für {key} ist zu lang (max. {PRIVACY_NOTE_MAX_LEN} Zeichen)."
)));
}
if key_str == "privacy_note" {
privacy_note_changed = true;
match key_str {
"privacy_note" => privacy_note_changed = true,
"theme_preset" => {
if !THEME_PRESETS.contains(&value.trim()) {
return Err(AppError::BadRequest(format!("Ungültiges Theme: {value}.")));
}
theme_changed = true;
}
"theme_primary" | "theme_accent" => {
if !is_hex_color(value.trim()) {
return Err(AppError::BadRequest(format!(
"Ungültige Farbe für {key}: muss #rrggbb sein."
)));
}
theme_changed = true;
}
_ => {}
}
} else {
return Err(AppError::BadRequest(format!(
@@ -217,16 +249,30 @@ pub async fn patch_config(
// Notify all clients that a publicly-readable config value changed so their stores
// (e.g. the privacy note in My Account) refresh without a manual reload.
if privacy_note_changed {
if privacy_note_changed || theme_changed {
let mut keys: Vec<&str> = Vec::new();
if privacy_note_changed {
keys.push("privacy_note");
}
if theme_changed {
keys.push("theme");
}
let _ = state.sse_tx.send(crate::state::SseEvent::new(
"event-updated",
serde_json::json!({ "keys": ["privacy_note"] }).to_string(),
serde_json::json!({ "keys": keys }).to_string(),
));
}
Ok(StatusCode::NO_CONTENT)
}
/// A strict `#rrggbb` hex-colour check (6 hex digits, leading `#`). Deliberately not
/// accepting shorthand/`#rgba` so the value is safe to drop straight into CSS.
fn is_hex_color(s: &str) -> bool {
let bytes = s.as_bytes();
bytes.len() == 7 && bytes[0] == b'#' && bytes[1..].iter().all(|b| b.is_ascii_hexdigit())
}
pub async fn get_export_jobs(
State(state): State<AppState>,
RequireAdmin(_auth): RequireAdmin,