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feat: wire auth into the web layer (Schritt 2, part 2/2)

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Registration creates a new account plus its first user; login
authenticates an existing one; both set a deklarix_session cookie
(HttpOnly, SameSite=Strict, Secure only when the request itself came
over TLS — hardcoding Secure=true would break local http://localhost
development, since browsers won't store a Secure cookie over plaintext).

requirePage protects full-page GETs (redirects to /login); requireAPI
protects the htmx/download endpoints (401, since those are only ever
called from an already-authenticated page — an unauthenticated hit
there is the exception, e.g. a session expiring mid-use).

handleCheck now creates submissions under the current account.
handleArchive and handleDossierDownload compare the submission's
account against the caller's and return 404 on mismatch — not 403,
which would confirm the ID exists to a different tenant. Login failure
uses the same message for "no such email" and "wrong password" to avoid
account enumeration.

Restructured templates along the way: layout.html now only holds
reusable fragments ("head", "nav"); each full page (index/login/register)
is its own top-level named template. The previous layout+content nesting
would have broken the moment a second page defined "content" — Go's
html/template keys blocks by name across the whole parsed set, not per
file, so two pages both defining "content" would silently overwrite each
other.

Verified against a real running instance (not just Go's test recorder):
started the compiled binary against a fresh Postgres and drove the whole
flow with curl — anonymous redirect, registration setting a real cookie,
authenticated page load, logout clearing both the cookie and the
server-side session row, and being locked out again afterward.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
noroot
2026-08-27 15:56:11 +02:00
parent 2a16dc2200
commit 5156fe62da
12 changed files with 755 additions and 128 deletions
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19
internal/web/templates/login.html Normal file
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{{define "login"}}<!doctype html>
<html lang="de">
<head>{{template "head" .}}</head>
<body>
<h1>Anmelden</h1>
{{if .Error}}<p class="fehler">{{.Error}}</p>{{end}}
<form method="post" action="/login">
<label for="email">E-Mail</label>
<input type="email" id="email" name="email" required>
<label for="password">Passwort</label>
<input type="password" id="password" name="password" required>
<button type="submit">Anmelden</button>
</form>
<p><a href="/register">Noch kein Konto? Registrieren</a></p>
</body>
</html>
{{end}}