Set the site address in the administration, checked against the installation itself

- System > This installation > Address has a field and a link to the other
  spelling (with or without www), like the WordPress address. It writes
  SITE_ORIGIN to .env through Environment::write and takes effect on the
  next request. With SITE_ORIGIN from the server environment there is no
  field, and a POST is refused.
- Before saving, OriginCheck requests /.well-known/kantsites-origin under the
  new address; it has to return an HMAC of APP_SECRET that only this
  installation knows. Switching to www without DNS or certificate would
  otherwise send every page, the administration included, nowhere. "Save
  anyway" appears only after a refusal. The probe also answers during
  maintenance.
- The message says when the administration changes host and needs a new
  sign-in, since the session cookie belongs to one spelling.

Tests: 584 PHPUnit on PHP 8.2 and 8.4, 35 node, test:editor and
test:browser green (test:browser reports only the known editor colour
contrast on /grundlagen).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
kantarciandClaude Opus 5 committed 2026-09-21 08:36:38 +02:00
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@@ -684,6 +684,14 @@ details.card > summary:hover { background: #fafbf8 }
.facts { display: grid; grid-template-columns: minmax(0, auto) minmax(0, 1fr); gap: 8px 20px; margin: 14px 0 0; font-size: 13px }
.facts dt { color: var(--muted) }
.facts dd { margin: 0; overflow-wrap: anywhere }
/* Die Adresse der Website auf der Systemseite: Feld und Knopf in einer Zeile, am Telefon untereinander. */
.origin-form { margin-top: 4px; max-width: 560px }
.origin-form label:first-of-type { margin-top: 10px }
.origin-row { display: flex; flex-wrap: wrap; gap: 8px }
.origin-row input { flex: 1 1 240px; width: auto; box-sizing: border-box; min-height: 40px; height: 40px }
.card-body .origin-row .secondary { margin: 0 }
.origin-form .check-label { margin-top: 10px }
.link-button { border: 0; background: none; padding: 0; min-height: 0; font: inherit; color: var(--accent); text-decoration: underline; cursor: pointer }
.check-list { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 10px; font-size: 13px; line-height: 1.55 }
.check-list li { display: flex; gap: 11px; align-items: flex-start }
.check-list li > span { min-width: 0; overflow-wrap: anywhere }