Version 2.2.0: Vorschau mit Zoom und PDF-Formularen, eine Uploadgrenze

2026-09-09 21:48:05 +02:00
1 parent f16ba7d875
commit 2c3ca4acc1
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"

 [project]
 name = "tesm"
-version = "2.1.2"
+version = "2.2.0"
 description = "TESM -- Verwaltung und Ueberwachung von PoE-Endgeraeten und Aruba-Switchen"
 requires-python = ">=3.11"
 dependencies = [
@@ -18,6 +18,7 @@ from flask import (
 from tesm_core import audit
 from tesm_core.auth.models import current_user, permission_required
 from tesm_core.auth.service import client_ip
+from tesm_core import uploads
 from tesm_core.extension import core, db, transaction

 from ..services import fileshare as service
@@ -75,7 +76,10 @@ def browse():
        token=token,
        listing=listing,
        error=error,
-        max_upload_mb=int(core().settings.get(conn, "fileshare_upload_max_mb") or 512),
+        # Dieselbe Zahl, die auch die Anfrage begrenzt und in nginx steht --
+        # vorher versprach diese Seite 512 MB, waehrend bei 64 MB abgebrochen
+        # wurde.
+        max_upload_mb=uploads.limit_mb(conn),
    )


@@ -95,7 +99,12 @@ def download(token: str):
        path,
        as_attachment=True,
        download_name=path.name,
-        mimetype=service.download_mime(path.name),
+        # Bewusst der neutrale Typ und nicht der erkannte: iOS Safari
+        # entscheidet nach dem MIME-Typ und zeigt eine "application/pdf" im
+        # Browser an, auch wenn sie als Anhang ausgeliefert wird. Wer hier
+        # klickt, will die Datei aber ablegen -- angesehen wird sie in der
+        # Vorschau. Fuer alle anderen Browser aendert sich damit nichts.
+        mimetype="application/octet-stream",
    )


@@ -148,7 +157,7 @@ def upload(token: str):
        flash("Keine Datei ausgewaehlt.", "danger")
        return redirect(url_for("fileshare.browse", freigabe=token, pfad=relative))

-    limit = int(core().settings.get(db(), "fileshare_upload_max_mb") or 512) * 1024 * 1024
+    limit = uploads.limit_bytes(db())
    stored = 0
    try:
        target_dir = service.resolve_path(mount, relative)
@@ -172,6 +181,41 @@ def upload(token: str):
    return redirect(url_for("fileshare.browse", freigabe=token, pfad=relative))


+@bp.post("/<token>/formular")
+@permission_required("fileshare.create")
+def save_form(token: str):
+    """Nimmt ein in der Vorschau ausgefuelltes PDF und legt es daneben ab.
+
+    Als **neue** Datei: auf einer Freigabe liegt in der Regel die leere
+    Vorlage, und die soll leer bleiben. Wer das Original ersetzen will, kann
+    die alte Datei danach loeschen -- das ist eine bewusste Handlung.
+    """
+    mount = _mount_or_404(token)
+    relative = request.form.get("pfad") or ""
+    upload_file = request.files.get("datei")
+    if upload_file is None or not upload_file.filename:
+        return {"error": "Es kam keine Datei an."}, 400
+
+    grenze = uploads.limit_bytes(db())
+    daten = upload_file.stream.read(grenze + 1)
+    if len(daten) > grenze:
+        return {"error": f"Zu gross (Grenze {grenze // 1024 // 1024} MB)."}, 413
+    if not daten.startswith(b"%PDF-"):
+        # Diese Route nimmt nur, was pdf.js hier ablegt. Ein anderer Inhalt
+        # waere ein Umweg, um beliebige Dateien in die Freigabe zu bekommen.
+        return {"error": "Das ist keine PDF-Datei."}, 415
+
+    try:
+        original = service.resolve_path(mount, relative)
+        ziel = service.free_name(original.parent, original.stem, "-ausgefuellt", ".pdf")
+        ziel.write_bytes(daten)
+    except service.FileshareError as exc:
+        return {"error": str(exc)}, 400
+
+    _audit("fileshare.form_saved", f"{mount.label}:{relative}", ziel.name, severity="notice")
+    return {"message": f"Als {ziel.name} gespeichert."}
+
+
@bp.post("/<token>/ordner")
@permission_required("fileshare.create")
 def make_directory(token: str):
@@ -57,6 +57,10 @@ PREVIEW_MIME: dict[str, str] = {
    ".gif": "image/gif",
    ".webp": "image/webp",
    ".bmp": "image/bmp",
+    # Das Format, in dem ein iPad fotografiert. Safari zeigt es an, andere
+    # Browser nicht -- die Vorschau sagt es dann und bietet den Download an.
+    ".heic": "image/heic",
+    ".heif": "image/heif",
    ".txt": "text/plain; charset=utf-8",
    ".csv": "text/plain; charset=utf-8",
    ".log": "text/plain; charset=utf-8",
@@ -68,6 +72,21 @@ PREVIEW_MIME: dict[str, str] = {
 #: im Ursprung der Anwendung ausgefuehrt. Download bleibt moeglich.


+def preview_kind(name: str) -> str:
+    """Welche Anzeige passt: ``bild``, ``pdf`` oder ``text``?
+
+    Die Unterscheidung gehoert hierher und nicht in die Vorlage: die
+    Zuordnung Endung -> MIME-Typ steht schon hier, und eine zweite Liste in
+    Jinja liefe frueher oder spaeter auseinander.
+    """
+    mime = PREVIEW_MIME.get(Path(name).suffix.lower(), "")
+    if mime.startswith("image/"):
+        return "bild"
+    if mime == "application/pdf":
+        return "pdf"
+    return "text"
+
+
 class FileshareError(Exception):
    """Fehler mit Klartextmeldung fuer die Oberflaeche."""

@@ -528,6 +547,7 @@ def list_directory(mount: Mount, relative: str = "") -> dict[str, Any]:
                directories.append(record)
            else:
                record["previewable"] = entry.suffix.lower() in PREVIEW_MIME
+                record["preview_kind"] = preview_kind(entry.name)
                files.append(record)
    except OSError as exc:
        raise FileshareError(f"Verzeichnis nicht lesbar ({exc}).") from exc
@@ -568,6 +588,23 @@ def safe_filename(name: str) -> str:
    return cleaned


+def free_name(parent: Path, stem: str, zusatz: str, suffix: str) -> Path:
+    """Ein freier Name neben dem Original: ``vorlage-ausgefuellt.pdf``.
+
+    Nichts ueberschreiben: auf einer Freigabe liegt meist die leere Vorlage,
+    und zwei Leute fuellen sie nacheinander aus. Ab dem zweiten Mal wird
+    durchnummeriert.
+    """
+    kandidat = parent / f"{stem}{zusatz}{suffix}"
+    zaehler = 2
+    while kandidat.exists():
+        kandidat = parent / f"{stem}{zusatz}-{zaehler}{suffix}"
+        zaehler += 1
+        if zaehler > 200:
+            raise FileshareError("Zu viele Dateien dieses Namens -- bitte aufraeumen.")
+    return kandidat
+
+
 def delete_entry(mount: Mount, relative: str) -> str:
    path = resolve_path(mount, relative)
    if path == mount.path.resolve():
@@ -79,15 +79,6 @@ TESM_SETTINGS: tuple[SettingSpec, ...] = (
        minimum=1,
        maximum=168,
    ),
-    SettingSpec(
-        "fileshare_upload_max_mb",
-        512,
-        "int",
-        "Maximale Dateigroesse beim Hochladen (MB)",
-        section="fileshare",
-        minimum=1,
-        maximum=8192,
-    ),
    # -- Wartung ------------------------------------------------------------ #
    SettingSpec(
        "maintenance_command_timeout",
@@ -103,6 +103,8 @@
                      <button class="link-icon file-name" type="button"
                              data-dialog-open="file-preview"
                              data-fill-Src="{{ url_for('fileshare.preview', token=token, pfad=entry.relative) }}"
+                              data-fill-Kind="{{ entry.preview_kind }}"
+                              data-fill-Pfad="{{ entry.relative }}"
                              data-fill-Name="{{ entry.name }}"
                              data-fill-Download="{{ url_for('fileshare.download', token=token, pfad=entry.relative) }}">
                        {{ icon('file-text', size=15) }} {{ entry.name }}
@@ -121,6 +123,8 @@
                      <button class="btn btn--sm btn--ghost" type="button"
                              data-dialog-open="file-preview"
                              data-fill-Src="{{ url_for('fileshare.preview', token=token, pfad=entry.relative) }}"
+                              data-fill-Kind="{{ entry.preview_kind }}"
+                              data-fill-Pfad="{{ entry.relative }}"
                              data-fill-Name="{{ entry.name }}"
                              data-fill-Download="{{ url_for('fileshare.download', token=token, pfad=entry.relative) }}"
                              aria-label="Vorschau">{{ icon('eye', size=15) }}</button>
@@ -201,14 +205,40 @@
     Dialog für alle Dateien statt einer je Zeile. #}
  {% call modal('file-preview', 'Vorschau', '', 'wide') %}
    <div class="modal__caption" data-fill-target="Name"></div>
-    <div class="modal__body modal__body--flush">
-      <iframe class="file-preview" title="Vorschau" data-fill-target="Src" data-fill-as="src"
-              src="about:blank" referrerpolicy="same-origin"></iframe>
+    {# Drei Anzeigen, eine je Art. Ein Rahmen für alles zeigte ein Foto vom
+       iPad in Originalgrösse (also einen Ausschnitt) und ein PDF auf iPadOS
+       nur als Standbild -- Formularfelder liessen sich nicht anfassen. #}
+    <div class="modal__body modal__body--flush" data-viewer
+         data-viewer-pdfjs="{{ asset_url('vendor/pdfjs/') }}">
+      <div class="viewer">
+        <div class="viewer__stage" data-viewer-bildbuehne hidden>
+          <img class="viewer__img" alt="" data-viewer-bild>
+        </div>
+        <div class="viewer__pdf" data-viewer-pdf hidden>
+          <div class="pdfViewer" data-viewer-pdfseiten></div>
+        </div>
+        <iframe class="file-preview" title="Vorschau" data-viewer-rahmen
+                src="about:blank" referrerpolicy="same-origin" hidden></iframe>
+        <div class="viewer__bar" data-viewer-leiste hidden>
+          <button class="btn btn--sm btn--ghost" type="button" data-viewer-zoom="aus"
+                  aria-label="Verkleinern">{{ icon('minus', size=15) }}</button>
+          <button class="btn btn--sm btn--ghost" type="button" data-viewer-zoom="fit">Anpassen</button>
+          <button class="btn btn--sm btn--ghost" type="button" data-viewer-zoom="ein"
+                  aria-label="Vergrössern">{{ icon('plus', size=15) }}</button>
+          <span class="viewer__hint fs-xs faint" data-viewer-hinweis></span>
+        </div>
+      </div>
    </div>
    <div class="modal__footer">
      <a class="btn btn--sm" data-fill-target="Download" data-fill-as="href" href="#" download>
        {{ icon('download', size=15) }} Herunterladen
      </a>
+      {% if current_user.has('fileshare.create') %}
+        <button class="btn btn--sm" type="button" data-viewer-speichern hidden
+                data-url="{{ url_for('fileshare.save_form', token=token) }}">
+          {{ icon('save', size=15) }} Ausgefüllt speichern
+        </button>
+      {% endif %}
      <button class="btn btn--primary" type="button" data-dialog-close>Schliessen</button>
    </div>
  {% endcall %}
@@ -190,7 +190,10 @@ fi
 # nicht ausdruecklich neu gesetzt wird.
 ENV_FILE="$ETC_TESM/$NAME.env"
 # Wo die Daten liegen, steht in der Umgebungsdatei; ohne sie beim Vorgabeort.
-DATEN_DIR="$(sed -n "s/^${ENV_PREFIX}DATA_DIR=//p" "$ENV_FILE" 2>/dev/null | tail -1)"
+# "|| true": bei einer Neuinstallation gibt es die Datei noch nicht, und ein
+# scheiterndes sed in einer Zuweisung beendet unter "set -e" das ganze Skript.
+DATEN_DIR="$(sed -n "s/^${ENV_PREFIX}DATA_DIR=//p" "$ENV_FILE" 2>/dev/null || true)"
+DATEN_DIR="$(printf '%s' "$DATEN_DIR" | tail -1)"
 DATEN_DIR="${DATEN_DIR:-$ROOT/data}"
 if [[ -z "$PORT" && -f "$ENV_FILE" ]]; then
  PORT="$(sed -n "s/^${ENV_PREFIX}BIND=127\.0\.0\.1:\([0-9]\{1,5\}\)$/\1/p" "$ENV_FILE" | head -1)"
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"

 [project]
 name = "tesm-core"
-version = "2.1.2"
+version = "2.2.0"
 description = "Gemeinsames Anwendungsgeruest (Auth, RBAC, Navigation, Design-System, Migrationen) fuer TESM und TESM-Lizenzserver"
 requires-python = ">=3.11"
 dependencies = [
@@ -31,6 +31,7 @@ from .security import csrf
 from .security import sessions as session_store
 from .security.sessions import SqliteSessionInterface
 from .settings_store import SettingSpec, SettingsStore
+from . import uploads
 from .sysops import SysOps
 from .auth import directory
 from .auth import routes as auth_routes
@@ -134,7 +135,7 @@ def create_base_app(
    #: Wortmarke, ohne Zeile darunter; die Marke selbst zeigen beide
    #: Anwendungen.
    auth_tagline: str = "",
-    app_version: str = "2.1.2",
+    app_version: str = "2.2.0",
    built_in_trusted_keys: tuple[str, ...] = (),
    enable_license: bool = True,
    template_folder: str | None = None,
@@ -163,6 +164,10 @@ def create_base_app(
    config.data_dir.mkdir(parents=True, exist_ok=True)
    config.log_dir.mkdir(parents=True, exist_ok=True)

+    # Die Groessengrenze einer Anfrage kommt aus der Einstellung, nicht aus
+    # der Konfiguration beim Start.
+    app.request_class = uploads.UploadLimitRequest
+
    app.config.update(
        SECRET_KEY=load_or_create_secret_key(config.secret_key_file),
        # site_key statt app_key: Cookies unterscheiden keine Ports. Zwei
@@ -172,6 +177,9 @@ def create_base_app(
        SESSION_COOKIE_HTTPONLY=True,
        SESSION_COOKIE_SECURE=config.security.cookie_secure,
        SESSION_COOKIE_SAMESITE=config.security.cookie_samesite,
+        # Nur die aeussere Schranke aus der Umgebung. Die eigentliche Grenze
+        # steht in der Einstellung und wird pro Anfrage gelesen (uploads.py) --
+        # sonst braeuchte jede Aenderung einen Neustart aller Arbeiter.
        MAX_CONTENT_LENGTH=config.security.max_content_length,
        JSON_SORT_KEYS=False,
        TRAP_HTTP_EXCEPTIONS=False,
@@ -328,6 +336,16 @@ def create_base_app(
    # -- Fehlerseiten ------------------------------------------------------ #
    @app.errorhandler(HTTPException)
    def _http_error(error: HTTPException):  # type: ignore[no-untyped-def]
+        if error.code == 413:
+            # "Request Entity Too Large" allein hilft niemandem weiter: die
+            # Zahl steht in einer Einstellung, und wer hochlaedt, soll sie
+            # sehen. Vorher stand hier nur der nackte Status.
+            grenze = uploads.limit_mb()
+            error.description = (
+                f"Diese Datei ist groesser als erlaubt. Zurzeit sind {grenze} MB je Upload "
+                "eingestellt; aendern kann das ein Administrator unter "
+                '"Einstellungen -> Webserver und TLS".'
+            )
        if _wants_json():
            return {
                "error": error.name,
@@ -685,7 +685,10 @@
  .modal__sub { font-size: var(--fs-xs); color: var(--text-faint); margin-top: 2px; }
  /* Eine Datei-Vorschau soll die ganze Flaeche des Dialogs nutzen; der
     uebliche Innenabstand des Dialogkoerpers wuerde sie einrahmen. */
-  .modal__body--flush { padding: 0; max-height: none; }
+  /* Zwei Klassen am selben Element: diese hier muss gewinnen, obwohl
+     .modal__body weiter unten steht. Mit der doppelten Klasse haengt das
+     nicht mehr an der Reihenfolge im Stylesheet. */
+  .modal__body.modal__body--flush { padding: 0; max-height: none; overflow: visible; }
  .modal__caption {
    padding: 0 var(--sp-5) var(--sp-2);
    color: var(--text-muted);
@@ -702,6 +705,74 @@
       darunter. --surface-0 gibt es nicht, der Rahmen blieb durchsichtig. */
    background: var(--surface-1);
  }
+
+  /* -- Betrachter: Bild, PDF, Rahmen ------------------------------------- */
+  /* Eine feste Hoehe fuer alle drei Anzeigen: sonst springt der Dialog beim
+     Wechsel zwischen Foto und PDF. */
+  .viewer {
+    position: relative;
+    display: flex;
+    flex-direction: column;
+    /* Was der Dialog uebrig laesst: Kopf, Dateiname und Fusszeile brauchen
+       zusammen rund 190 Pixel. Ein fester Anteil der Fensterhoehe schob die
+       Zoomleiste auf kleinen Fenstern unter den Rand. */
+    height: min(calc(100dvh - 240px), 760px);
+    min-height: 220px;
+    background: var(--surface-1);
+  }
+  .viewer > .file-preview {
+    flex: 1;
+    height: auto;
+  }
+  .viewer__stage {
+    position: relative;
+    flex: 1;
+    /* Ohne min-height waechst die Buehne mit dem Bild, und dessen
+       max-height:100% haengt dann an sich selbst: ein 4032x3024-Foto stand
+       36 Pixel ueber den Rand hinaus. */
+    min-height: 0;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    overflow: hidden;
+    /* Die Seite darf nicht mitwandern, wenn im Bild geschoben wird. */
+    touch-action: none;
+    cursor: zoom-in;
+  }
+  .viewer__stage--gezogen {
+    cursor: grab;
+  }
+  .viewer__img {
+    /* Der Ausgangszustand ist "passt in die Flaeche" -- genau das fehlte:
+       ein Foto vom iPad ist 4032 Pixel breit und wurde im Rahmen 1:1
+       gezeigt, also als Ausschnitt aus der Mitte. */
+    max-width: 100%;
+    max-height: 100%;
+    /* Zoomen soll nicht unscharf wirken, solange nicht vergroessert wird. */
+    transform-origin: center center;
+    will-change: transform;
+    user-select: none;
+    -webkit-user-drag: none;
+  }
+  /* pdf.js verlangt einen absolut positionierten, scrollenden Behaelter. */
+  .viewer__pdf {
+    position: absolute;
+    inset: 0;
+    bottom: var(--sp-10);
+    overflow: auto;
+    -webkit-overflow-scrolling: touch;
+  }
+  .viewer__bar {
+    display: flex;
+    align-items: center;
+    gap: var(--sp-2);
+    padding: var(--sp-2) var(--sp-4);
+    border-top: 1px solid var(--border);
+    background: var(--surface-2, var(--surface-1));
+  }
+  .viewer__hint {
+    margin-inline-start: auto;
+  }
  /* Der Dateiname ist ein Knopf (er oeffnet die Vorschau), soll aber wie ein
     Link aussehen -- ein Knopf mit Rahmen mitten in einer Tabellenzeile waere
     unruhig. */
@@ -895,6 +895,16 @@ function boot() {
  initTileFilters();
  initLogTails();
  unsavedGuard.init();
+  initViewer();
+}
+
+/* Der Dateibetrachter kommt nur auf Seiten mit Vorschau -- und er zieht bei
+   einem PDF noch pdf.js nach. Beides erst dann, wenn es gebraucht wird. */
+function initViewer() {
+  if (!document.querySelector("[data-viewer]")) return;
+  import("./viewer.js")
+    .then((modul) => modul.initFilePreview())
+    .catch((fehler) => console.error("Dateibetrachter", fehler));
 }

 if (document.readyState === "loading") {
@@ -0,0 +1,388 @@
+/* =============================================================================
+ * Dateivorschau: Bilder zoomen, PDF-Formulare ausfuellen.
+ *
+ * Vorher lief jede Vorschau durch einen <iframe> -- der Browser entschied
+ * selbst. Zwei Dinge gingen dabei schief:
+ *
+ *   * Ein Foto vom iPad ist 4032 Pixel breit. Der Rahmen zeigte es 1:1, also
+ *     einen Ausschnitt aus der Mitte, und zoomen liess sich nichts.
+ *   * Ein PDF im Rahmen ist auf iPadOS nur ein Standbild der ersten Seite.
+ *     Formularfelder sind dort nicht anfassbar.
+ *
+ * Jetzt entscheidet die Art der Datei (bild | pdf | text), welche Anzeige
+ * aufgeht. Bilder bekommen einen eigenen Betrachter mit Zoom und Verschieben
+ * (Finger, Rad, Knoepfe); PDFs werden von pdf.js gerendert -- damit sind
+ * Formularfelder echte Eingabefelder, auch in Safari.
+ *
+ * pdf.js liegt im Paket (static/vendor/pdfjs) und wird erst geladen, wenn
+ * wirklich ein PDF geoeffnet wird: 1,7 MB gehoeren nicht in jeden Seitenaufruf.
+ * ========================================================================== */
+
+const MIN_ZOOM = 0.1;
+const MAX_ZOOM = 8;
+
+/* -- Bilder ---------------------------------------------------------------- */
+
+/** Zoom und Verschieben fuer ein einzelnes Bild. */
+function bildBetrachter(buehne, bild) {
+  let zoom = 1;
+  let x = 0;
+  let y = 0;
+  let angepasst = true; // noch nie von Hand gezoomt -> passt sich der Flaeche an
+
+  const anwenden = () => {
+    bild.style.transform = `translate(${x}px, ${y}px) scale(${zoom})`;
+    buehne.classList.toggle("viewer__stage--gezogen", zoom > 1);
+    buehne.dispatchEvent(new CustomEvent("zoom", { detail: { zoom, angepasst } }));
+  };
+
+  const grenzen = () => {
+    // Nicht aus dem Bild herausschieben: was ueber die Buehne hinausragt,
+    // darf verschoben werden, mehr nicht.
+    const b = buehne.getBoundingClientRect();
+    const breite = (bild.clientWidth * zoom - b.width) / 2;
+    const hoehe = (bild.clientHeight * zoom - b.height) / 2;
+    x = Math.min(Math.max(x, -Math.max(0, breite)), Math.max(0, breite));
+    y = Math.min(Math.max(y, -Math.max(0, hoehe)), Math.max(0, hoehe));
+  };
+
+  const setzen = (wert, { fest = false } = {}) => {
+    zoom = Math.min(MAX_ZOOM, Math.max(MIN_ZOOM, wert));
+    angepasst = !fest && Math.abs(zoom - 1) < 0.001;
+    if (zoom <= 1) {
+      x = 0;
+      y = 0;
+    } else {
+      grenzen();
+    }
+    anwenden();
+  };
+
+  const zuruecksetzen = () => {
+    zoom = 1;
+    x = 0;
+    y = 0;
+    angepasst = true;
+    anwenden();
+  };
+
+  /* Ziehen mit Maus oder einem Finger, sobald hineingezoomt ist. */
+  let zieht = null;
+  buehne.addEventListener("pointerdown", (event) => {
+    if (zoom <= 1 || event.pointerType === "touch" && event.isPrimary === false) return;
+    zieht = { id: event.pointerId, x: event.clientX - x, y: event.clientY - y };
+    buehne.setPointerCapture(event.pointerId);
+  });
+  buehne.addEventListener("pointermove", (event) => {
+    if (!zieht || event.pointerId !== zieht.id) return;
+    event.preventDefault();
+    x = event.clientX - zieht.x;
+    y = event.clientY - zieht.y;
+    grenzen();
+    anwenden();
+  });
+  const loslassen = (event) => {
+    if (zieht && event.pointerId === zieht.id) zieht = null;
+  };
+  buehne.addEventListener("pointerup", loslassen);
+  buehne.addEventListener("pointercancel", loslassen);
+
+  /* Zwei Finger: aufziehen und zusammenziehen. Der Dialog liegt ueber der
+     Seite, deren eigenes Zoomen hier nicht greift -- also selbst rechnen. */
+  let start = null;
+  const abstand = (t) => Math.hypot(t[0].clientX - t[1].clientX, t[0].clientY - t[1].clientY);
+  buehne.addEventListener(
+    "touchstart",
+    (event) => {
+      if (event.touches.length !== 2) return;
+      start = { d: abstand(event.touches), zoom };
+    },
+    { passive: true }
+  );
+  buehne.addEventListener(
+    "touchmove",
+    (event) => {
+      if (!start || event.touches.length !== 2) return;
+      event.preventDefault();
+      setzen((start.zoom * abstand(event.touches)) / start.d, { fest: true });
+    },
+    { passive: false }
+  );
+  buehne.addEventListener("touchend", () => {
+    start = null;
+  });
+
+  /* Rad zoomt, Umschalt oder Strg nicht noetig -- im Dialog gibt es nichts
+     anderes zu scrollen. */
+  buehne.addEventListener(
+    "wheel",
+    (event) => {
+      event.preventDefault();
+      setzen(zoom * (event.deltaY < 0 ? 1.12 : 1 / 1.12), { fest: true });
+    },
+    { passive: false }
+  );
+
+  /* Doppeltippen: zwischen angepasst und doppelt umschalten. */
+  buehne.addEventListener("dblclick", () => setzen(zoom > 1 ? 1 : 2, { fest: zoom <= 1 }));
+
+  return {
+    hinein: () => setzen(zoom * 1.25, { fest: true }),
+    hinaus: () => setzen(zoom / 1.25, { fest: true }),
+    anpassen: zuruecksetzen,
+    zuruecksetzen,
+    get zoom() {
+      return zoom;
+    },
+  };
+}
+
+/* -- PDF ------------------------------------------------------------------- */
+
+let pdfjsGeladen = null;
+
+/** Laedt pdf.js einmalig nach; das Paket liegt neben dieser Datei. */
+async function pdfjsLaden(basis) {
+  if (!pdfjsGeladen) {
+    pdfjsGeladen = (async () => {
+      const lib = await import(`${basis}pdf.min.mjs`);
+      // Der Komponentenbau von pdf.js sucht die Bibliothek unter diesem Namen.
+      globalThis.pdfjsLib = lib;
+      const komponenten = await import(`${basis}pdf_viewer.mjs`);
+      // Das Stylesheet von pdf.js zeichnet die Formularfelder. 100 KB gehoeren
+      // nicht in jeden Seitenaufruf -- also erst hier.
+      const stil = document.createElement("link");
+      stil.rel = "stylesheet";
+      stil.href = `${basis}pdf_viewer.css`;
+      document.head.append(stil);
+      lib.GlobalWorkerOptions.workerSrc = `${basis}pdf.worker.min.mjs`;
+      return { lib, komponenten };
+    })().catch((fehler) => {
+      pdfjsGeladen = null;
+      throw fehler;
+    });
+  }
+  return pdfjsGeladen;
+}
+
+/** Zeigt ein PDF mit ausfuellbaren Formularfeldern. */
+async function pdfBetrachter(behaelter, seiten, url, basis) {
+  const { lib, komponenten } = await pdfjsLaden(basis);
+  const eventBus = new komponenten.EventBus();
+  const linkService = new komponenten.PDFLinkService({ eventBus });
+  const viewer = new komponenten.PDFViewer({
+    container: behaelter,
+    viewer: seiten,
+    eventBus,
+    linkService,
+    // Der Kern der Sache: Formularfelder werden zu echten Eingabefeldern.
+    annotationMode: lib.AnnotationMode.ENABLE_FORMS,
+    textLayerMode: 1,
+  });
+  linkService.setViewer(viewer);
+
+  const dokument = await lib.getDocument({
+    url,
+    // Ohne die Standardschriften bleibt jede Seite mit Text leer: Helvetica
+    // und Verwandte liegen als Datei im Paket, nicht im Browser.
+    standardFontDataUrl: `${basis}standard_fonts/`,
+    isEvalSupported: false,
+  }).promise;
+  viewer.setDocument(dokument);
+  linkService.setDocument(dokument, null);
+  await new Promise((fertig) => eventBus.on("pagesinit", fertig, { once: true }));
+  // Auf einem iPad ist die Seitenbreite das, was man sehen will.
+  viewer.currentScaleValue = "page-width";
+
+  /* Zwei Finger zoomen auch hier. */
+  let start = null;
+  const abstand = (t) => Math.hypot(t[0].clientX - t[1].clientX, t[0].clientY - t[1].clientY);
+  behaelter.addEventListener(
+    "touchstart",
+    (event) => {
+      if (event.touches.length === 2) start = { d: abstand(event.touches), s: viewer.currentScale };
+    },
+    { passive: true }
+  );
+  behaelter.addEventListener(
+    "touchmove",
+    (event) => {
+      if (!start || event.touches.length !== 2) return;
+      event.preventDefault();
+      const wert = (start.s * abstand(event.touches)) / start.d;
+      viewer.currentScale = Math.min(MAX_ZOOM, Math.max(0.25, wert));
+    },
+    { passive: false }
+  );
+  behaelter.addEventListener("touchend", () => {
+    start = null;
+  });
+
+  return {
+    hinein: () => {
+      viewer.currentScale = Math.min(MAX_ZOOM, viewer.currentScale * 1.2);
+    },
+    hinaus: () => {
+      viewer.currentScale = Math.max(0.25, viewer.currentScale / 1.2);
+    },
+    anpassen: () => {
+      viewer.currentScaleValue = "page-width";
+    },
+    /** Das ausgefuellte Formular als Bytes -- pdf.js schreibt die Werte hinein. */
+    speichern: () => dokument.saveDocument(),
+    /** Wurde ueberhaupt etwas eingetragen? */
+    veraendert: () => {
+      const s = dokument.annotationStorage;
+      return Boolean(s && s.size);
+    },
+    schliessen: () => {
+      viewer.setDocument(null);
+      linkService.setDocument(null);
+      dokument.destroy();
+    },
+  };
+}
+
+/* -- Zusammenbau ----------------------------------------------------------- */
+
+export function initFilePreview(wurzel = document) {
+  const rumpf = wurzel.querySelector("[data-viewer]");
+  if (!rumpf) return;
+  // Fusszeile und Titel liegen ausserhalb des Rumpfes -- gesucht wird deshalb
+  // im ganzen Dialog. (Der Speichern-Knopf blieb sonst immer verborgen.)
+  const dialog = rumpf.closest("dialog") || rumpf;
+
+  const stueck = (name) => dialog.querySelector(`[data-viewer-${name}]`);
+  const bildBuehne = stueck("bildbuehne");
+  const bild = stueck("bild");
+  const pdfBehaelter = stueck("pdf");
+  const pdfSeiten = stueck("pdfseiten");
+  const rahmen = stueck("rahmen");
+  const leiste = stueck("leiste");
+  const hinweis = stueck("hinweis");
+  const speichern = stueck("speichern");
+  const basis = rumpf.dataset.viewerPdfjs || "";
+
+  // Ein Format, das dieser Browser nicht kann (HEIC ausserhalb von Safari),
+  // soll nicht als leere Flaeche enden.
+  bild.addEventListener("error", () => {
+    if (bildBuehne.hidden || !bild.getAttribute("src")) return;
+    if (hinweis) {
+      hinweis.textContent =
+        "Dieses Bildformat kann Ihr Browser nicht anzeigen -- bitte herunterladen.";
+    }
+  });
+
+  const bilder = bildBetrachter(bildBuehne, bild);
+  bildBuehne.addEventListener("zoom", (event) => {
+    if (!hinweis || bildBuehne.hidden) return;
+    const { zoom, angepasst } = event.detail;
+    hinweis.textContent = angepasst ? "eingepasst" : `${Math.round(zoom * 100)} %`;
+  });
+  let pdf = null;
+  let aktuell = null;
+
+  const zeigen = (art) => {
+    bildBuehne.hidden = art !== "bild";
+    pdfBehaelter.hidden = art !== "pdf";
+    rahmen.hidden = art !== "text";
+    leiste.hidden = art === "text";
+    if (speichern) speichern.hidden = art !== "pdf";
+  };
+
+  const aufraeumen = () => {
+    bild.removeAttribute("src");
+    bilder.zuruecksetzen();
+    rahmen.src = "about:blank";
+    if (pdf) {
+      try {
+        pdf.schliessen();
+      } catch {
+        /* ein halb geladenes Dokument darf beim Schliessen nicht stoeren */
+      }
+      pdf = null;
+    }
+    pdfSeiten.replaceChildren();
+    if (hinweis) hinweis.textContent = "";
+    aktuell = null;
+  };
+
+  const oeffnen = async (ausloeser) => {
+    aufraeumen();
+    const art = ausloeser.dataset.fillKind || "text";
+    const quelle = ausloeser.dataset.fillSrc || "";
+    aktuell = { art, quelle, pfad: ausloeser.dataset.fillPfad || "" };
+    zeigen(art);
+    if (art === "bild") {
+      bild.src = quelle;
+      return;
+    }
+    if (art !== "pdf") {
+      rahmen.src = quelle;
+      return;
+    }
+    if (hinweis) hinweis.textContent = "PDF wird geladen ...";
+    try {
+      pdf = await pdfBetrachter(pdfBehaelter, pdfSeiten, quelle, basis);
+      if (hinweis) hinweis.textContent = "";
+    } catch (fehler) {
+      // Kein weisses Feld: sagen, was los ist, und auf die einfache Anzeige
+      // zurueckfallen. Die kann wenigstens lesen, wenn auch nicht ausfuellen.
+      console.error("pdf.js", fehler);
+      zeigen("text");
+      rahmen.src = quelle;
+      if (hinweis) {
+        hinweis.textContent =
+          "Dieses Geraet kann die Formularansicht nicht laden -- es bleibt bei der einfachen Anzeige.";
+      }
+    }
+  };
+
+  document.addEventListener("click", (event) => {
+    const ausloeser = event.target.closest('[data-dialog-open="file-preview"]');
+    if (ausloeser) {
+      // Der Dialog selbst wird von app.js geoeffnet; hier nur der Inhalt.
+      oeffnen(ausloeser);
+      return;
+    }
+    const knopf = event.target.closest("[data-viewer-zoom]");
+    if (!knopf) return;
+    event.preventDefault();
+    const betrachter = pdf || bilder;
+    ({ ein: betrachter.hinein, aus: betrachter.hinaus, fit: betrachter.anpassen })[
+      knopf.dataset.viewerZoom
+    ]?.();
+  });
+
+  dialog.addEventListener("close", aufraeumen);
+
+  /* Ausgefuelltes Formular zurueck in die Freigabe. */
+  speichern?.addEventListener("click", async () => {
+    if (!pdf || !aktuell) return;
+    const ziel = speichern.dataset.url;
+    speichern.disabled = true;
+    const vorher = speichern.textContent;
+    speichern.textContent = "Speichern ...";
+    try {
+      const bytes = await pdf.speichern();
+      const daten = new FormData();
+      daten.append("pfad", aktuell.pfad);
+      daten.append(
+        "datei",
+        new Blob([bytes], { type: "application/pdf" }),
+        (aktuell.pfad.split("/").pop() || "formular.pdf")
+      );
+      const antwort = await window.tesm.api(ziel, { method: "POST", body: daten });
+      window.tesm.showToast(antwort.message || "Gespeichert.", "success");
+      dialog.close();
+      window.location.reload();
+    } catch (fehler) {
+      // Die Meldung fuer den Benutzer, die Einzelheiten fuer die Konsole.
+      console.error("Formular speichern", fehler);
+      window.tesm.showToast(fehler.message || "Speichern fehlgeschlagen.", "danger");
+    } finally {
+      speichern.disabled = false;
+      speichern.textContent = vorher;
+    }
+  });
+}
@@ -0,0 +1,6 @@
+pdf.js 4.10.38 -- https://github.com/mozilla/pdf.js
+Aus dem npm-Paket pdfjs-dist; nur build/pdf.min.mjs, build/pdf.worker.min.mjs,
+web/pdf_viewer.mjs, web/pdf_viewer.css und web/images. Apache-2.0, siehe LICENSE.
+
+Warum eingebettet und nicht von einem CDN: TESM laeuft in abgeschotteten
+Netzen. Was die Oberflaeche braucht, muss im Paket liegen.
@@ -0,0 +1,177 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
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+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
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+      including but not limited to software source code, documentation
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+
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+      not limited to compiled object code, generated documentation,
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+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
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+      of this License, Derivative Works shall not include works that remain
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+   2. Grant of Copyright License. Subject to the terms and conditions of
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+
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+
+      (b) You must cause any modified files to carry prominent notices
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+
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+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
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+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
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+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
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+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
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+      other commercial damages or losses), even if such Contributor
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+   9. Accepting Warranty or Additional Liability. While redistributing
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+
+   END OF TERMS AND CONDITIONS
@@ -0,0 +1 @@
+4.10.38
@@ -0,0 +1,3 @@
+<svg width="12" height="13" viewBox="0 0 12 13" fill="none" xmlns="http://www.w3.org/2000/svg">
+   <path d="M5.375 7.625V11.875C5.375 12.0408 5.44085 12.1997 5.55806 12.3169C5.67527 12.4342 5.83424 12.5 6 12.5C6.16576 12.5 6.32473 12.4342 6.44194 12.3169C6.55915 12.1997 6.625 12.0408 6.625 11.875V7.625L7.125 7.125H11.375C11.5408 7.125 11.6997 7.05915 11.8169 6.94194C11.9342 6.82473 12 6.66576 12 6.5C12 6.33424 11.9342 6.17527 11.8169 6.05806C11.6997 5.94085 11.5408 5.875 11.375 5.875H7.125L6.625 5.375V1.125C6.625 0.95924 6.55915 0.800269 6.44194 0.683058C6.32473 0.565848 6.16576 0.5 6 0.5C5.83424 0.5 5.67527 0.565848 5.55806 0.683058C5.44085 0.800269 5.375 0.95924 5.375 1.125V5.375L4.875 5.875H0.625C0.45924 5.875 0.300269 5.94085 0.183058 6.05806C0.065848 6.17527 0 6.33424 0 6.5C0 6.66576 0.065848 6.82473 0.183058 6.94194C0.300269 7.05915 0.45924 7.125 0.625 7.125H4.762L5.375 7.625Z" fill="black"/>
+</svg> 
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+/**
+ * @licstart The following is the entire license notice for the
+ * JavaScript code in this page
+ *
+ * Copyright 2024 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * @licend The above is the entire license notice for the
+ * JavaScript code in this page
+ */var t={d:(e,i)=>{for(var s in i)t.o(i,s)&&!t.o(e,s)&&Object.defineProperty(e,s,{enumerable:!0,get:i[s]})},o:(t,e)=>Object.prototype.hasOwnProperty.call(t,e)},__webpack_exports__ = globalThis.pdfjsLib = 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+/**
+ * @licstart The following is the entire license notice for the
+ * JavaScript code in this page
+ *
+ * Copyright 2024 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * @licend The above is the entire license notice for the
+ * JavaScript code in this page
+ */var e={d:(t,i)=>{for(var a in i)e.o(i,a)&&!e.o(t,a)&&Object.defineProperty(t,a,{enumerable:!0,get:i[a]})},o:(e,t)=>Object.prototype.hasOwnProperty.call(e,t)},__webpack_exports__ = globalThis.pdfjsWorker = {};e.d(__webpack_exports__,{WorkerMessageHandler:()=>WorkerMessageHandler});const t=!("object"!=typeof process||process+""!="[object 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+// Copyright 2014 PDFium Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
@@ -0,0 +1,102 @@
+Digitized data copyright (c) 2010 Google Corporation
+	with Reserved Font Arimo, Tinos and Cousine.
+Copyright (c) 2012 Red Hat, Inc.
+	with Reserved Font Name Liberation.
+
+This Font Software is licensed under the SIL Open Font License,
+Version 1.1.
+
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+
+PREAMBLE The goals of the Open Font License (OFL) are to stimulate
+worldwide development of collaborative font projects, to support the font
+creation efforts of academic and linguistic communities, and to provide
+a free and open framework in which fonts may be shared and improved in
+partnership with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves.
+The fonts, including any derivative works, can be bundled, embedded,
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works.  The fonts and derivatives,
+however, cannot be released under any other type of license.  The
+requirement for fonts to remain under this license does not apply to
+any document created using the fonts or their derivatives.
+
+ 
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such.
+This may include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components
+as distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting ? in part or in whole ?
+any of the components of the Original Version, by changing formats or
+by porting the Font Software to a new environment.
+
+"Author" refers to any designer, engineer, programmer, technical writer
+or other person who contributed to the Font Software.
+
+
+PERMISSION & CONDITIONS
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,in
+   Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+   redistributed and/or sold with any software, provided that each copy
+   contains the above copyright notice and this license. These can be
+   included either as stand-alone text files, human-readable headers or
+   in the appropriate machine-readable metadata fields within text or
+   binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+   Name(s) unless explicit written permission is granted by the
+   corresponding Copyright Holder. This restriction only applies to the
+   primary font name as presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+   Software shall not be used to promote, endorse or advertise any
+   Modified Version, except to acknowledge the contribution(s) of the
+   Copyright Holder(s) and the Author(s) or with their explicit written
+   permission.
+
+5) The Font Software, modified or unmodified, in part or in whole, must
+   be distributed entirely under this license, and must not be distributed
+   under any other license. The requirement for fonts to remain under
+   this license does not apply to any document created using the Font
+   Software.
+
+
+ 
+TERMINATION
+This license becomes null and void if any of the above conditions are not met.
+
+ 
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT.  IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM OTHER
+DEALINGS IN THE FONT SOFTWARE.
+
@@ -26,6 +26,7 @@ from dataclasses import dataclass
 from pathlib import Path
 from typing import Any

+from .. import uploads
 from ..sysops import SysOps

 logger = logging.getLogger(__name__)
@@ -99,7 +100,10 @@ def validate_domain(value: str) -> str:

 def render(config: WebConfig) -> str:
    """Erzeugt die vollstaendige Site-Konfiguration."""
-    body = f"{max(1, config.max_body_mb)}m"
+    # Bewusst mehr als die Anwendung erlaubt: laeuft die Grenze hier zuerst
+    # auf, sieht der Benutzer die nackte 413 von nginx. Kommt die Anfrage
+    # dagegen bis zur Anwendung, sagt die, wie viel erlaubt ist.
+    body = f"{uploads.nginx_mb(config.max_body_mb)}m"
    # Kopfzeilen und proxy_pass -- ohne Zeitlimits. Die kommen je Block dazu,
    # denn nginx lehnt eine doppelte Direktive im selben Block ab (auf POETEST
    # real passiert: der Websocket-Block erbte 120s und setzte noch einmal
@@ -194,8 +198,9 @@ def render(config: WebConfig) -> str:
 def _site_body(config: WebConfig, common_proxy: list[str], body: str, *, tls: bool) -> list[str]:
    lines = [
        f"    client_max_body_size {body};",
-        "    # Groesser als das Limit der Anwendung, damit deren eigene, erklaerende",
-        "    # Fehlerseite gewinnt statt der generischen 413 von nginx.",
+        f"    # {uploads.NGINX_ZUSCHLAG_MB} MB mehr als die Anwendung erlaubt, damit deren"
+        " eigene,",
+        "    # erklaerende Fehlerseite gewinnt statt der generischen 413 von nginx.",
        "",
        "    location /assets/ {",
        f"        alias {config.static_root.rstrip('/')}/;",
@@ -41,6 +41,15 @@ blieb dadurch über Jahre bestehen und lieferte alle statischen Dateien als 404.
                     disabled=bool(license_hint), extra_class='field--full') }}
            {{ field('web_acme_webroot', 'ACME-Webroot', value=config.acme_webroot,
                     disabled=bool(license_hint), extra_class='field--full') }}
+            {# Eine Zahl für beides. Vorher galt in der Anwendung eine andere
+               Grenze als in nginx: die Freigabeseite versprach 512 MB, bei
+               64 MB brach die Anfrage mit einer nackten 413 ab. #}
+            {{ field('web_max_body_mb', 'Maximale Uploadgröße (MB)',
+                     value=config.max_body_mb, type='number',
+                     attrs='min="1" max="8192" step="1"',
+                     hint_text='Gilt für die Anwendung sofort. nginx bekommt beim Übernehmen
+                     ' ~ nginx_zuschlag ~ ' MB mehr, damit die Anwendung erklären kann, was zu
+                     groß war -- statt einer nackten Fehlerseite des Webservers.') }}
          </div>
          <div class="stack stack--tight">
            {{ checkbox('web_https_enabled', 'HTTPS auf Port 443 anbieten',
@@ -44,6 +44,9 @@ ICONS: dict[str, str] = {
    "log-out": '<path d="M15 4h3a2 2 0 0 1 2 2v12a2 2 0 0 1-2 2h-3M10 8l-4 4 4 4M6 12h10"/>',
    "settings": '<circle cx="12" cy="12" r="3"/><path d="M19.4 15a1.7 1.7 0 0 0 .3 1.9l.1.1a2 2 0 1 1-2.8 2.8l-.1-.1a1.7 1.7 0 0 0-1.9-.3 1.7 1.7 0 0 0-1 1.5V21a2 2 0 1 1-4 0v-.1a1.7 1.7 0 0 0-1.1-1.5 1.7 1.7 0 0 0-1.9.3l-.1.1a2 2 0 1 1-2.8-2.8l.1-.1a1.7 1.7 0 0 0 .3-1.9 1.7 1.7 0 0 0-1.5-1H3a2 2 0 1 1 0-4h.1A1.7 1.7 0 0 0 4.6 9a1.7 1.7 0 0 0-.3-1.9l-.1-.1a2 2 0 1 1 2.8-2.8l.1.1a1.7 1.7 0 0 0 1.9.3H9a1.7 1.7 0 0 0 1-1.5V3a2 2 0 1 1 4 0v.1a1.7 1.7 0 0 0 1 1.5 1.7 1.7 0 0 0 1.9-.3l.1-.1a2 2 0 1 1 2.8 2.8l-.1.1a1.7 1.7 0 0 0-.3 1.9V9a1.7 1.7 0 0 0 1.5 1H21a2 2 0 1 1 0 4h-.1a1.7 1.7 0 0 0-1.5 1z"/>',
    "plus": '<path d="M12 5v14M5 12h14"/>',
+    "minus": '<path d="M5 12h14"/>',
+    # Diskette -- die Vorschau schreibt ein ausgefuelltes Formular zurueck.
+    "save": '<path d="M5 4h11l3 3v13H5z"/><path d="M8 4v5h7V4M8 20v-6h8v6"/>',
    "pencil": '<path d="M4 20h4l10.5-10.5a2.1 2.1 0 0 0-3-3L5 17v3z"/>',
    "x": '<path d="M6 6l12 12M18 6 6 18"/>',
    "check": '<path d="m5 13 4 4L19 7"/>',
@@ -0,0 +1,80 @@
+"""Die zulaessige Groesse eines Uploads -- **eine** Zahl fuer alles.
+
+Vorher gab es drei Grenzen, die nichts voneinander wussten:
+
+* ``MAX_CONTENT_LENGTH`` der Anwendung (64 MB, aus einer Umgebungsvariablen),
+* ``client_max_body_size`` von nginx (aus der Einstellung ``web_max_body_mb``),
+* eine eigene Grenze der Dateifreigabe (512 MB, nirgends einstellbar).
+
+Wirksam war die kleinste, sichtbar die groesste: die Freigabeseite versprach
+512 MB je Datei, und bei 64 MB brach die Anfrage mit einer nackten 413 ab.
+
+Jetzt gilt ``web_max_body_mb`` fuer beides. Und weil eine Einstellung erst
+nuetzlich ist, wenn sie sofort greift, liest die Anwendung sie **pro Anfrage**
+statt beim Start -- sonst braeuchte jede Aenderung einen Neustart des Dienstes.
+
+nginx bekommt bewusst etwas mehr als die Anwendung: laeuft die Grenze im
+Webserver zuerst auf, sieht der Benutzer die generische Fehlerseite von nginx.
+Kommt die Anfrage dagegen bis zur Anwendung, kann diese erklaeren, was zu gross
+war und wie viel erlaubt ist.
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from flask import Request, current_app
+
+#: Wieviel nginx mehr erlaubt als die Anwendung. Nicht null: die Anwendung soll
+#: die Grenze melden duerfen, nicht der Webserver.
+NGINX_ZUSCHLAG_MB = 16
+
+#: Wird die Einstellung nicht gefunden (fruehe Anfrage, kaputte Datenbank),
+#: gilt diese Grenze. Gross genug fuer den Alltag, klein genug, um nicht als
+#: unbegrenzt durchzugehen.
+NOTFALL_MB = 128
+
+SETTING = "web_max_body_mb"
+
+
+def limit_mb(conn: Any = None) -> int:
+    """Die eingestellte Grenze in MB.
+
+    Ohne Verbindung wird die der laufenden Anfrage benutzt. Faellt irgendetwas
+    aus -- keine Anwendung, keine Datenbank --, gilt ``NOTFALL_MB``: eine
+    Groessenpruefung darf nie daran scheitern, dass sie ihre Grenze nicht
+    kennt.
+    """
+    try:
+        from .extension import core, db
+
+        extension = core()
+        return max(1, int(extension.settings.get(conn if conn is not None else db(), SETTING)))
+    except Exception:  # noqa: BLE001 - Grenze muss immer eine Zahl sein
+        return NOTFALL_MB
+
+
+def limit_bytes(conn: Any = None) -> int:
+    return limit_mb(conn) * 1024 * 1024
+
+
+def nginx_mb(app_limit_mb: int) -> int:
+    """Was in ``client_max_body_size`` gehoert."""
+    return max(1, int(app_limit_mb)) + NGINX_ZUSCHLAG_MB
+
+
+class UploadLimitRequest(Request):
+    """Anfrage, deren Groessengrenze aus der Einstellung kommt.
+
+    Flask liest ``MAX_CONTENT_LENGTH`` aus der Konfiguration -- also aus dem
+    Zustand beim Start des Prozesses. Bei mehreren gunicorn-Arbeitern haette
+    eine Aenderung damit erst nach einem Neustart in allen gewirkt. Diese
+    Eigenschaft fragt stattdessen die Einstellung; das ist ein Lesezugriff auf
+    SQLite und passiert nur, wenn eine Anfrage ueberhaupt einen Koerper hat.
+    """
+
+    @property
+    def max_content_length(self) -> int | None:  # type: ignore[override]
+        if current_app:
+            return limit_bytes()
+        return super().max_content_length
@@ -19,6 +19,7 @@ from typing import Any
 from flask import Blueprint, flash, jsonify, redirect, render_template, request, url_for

 from .. import audit
+from .. import uploads
 from ..auth import directory
 from ..auth.models import current_user, permission_required
 from ..auth.service import client_ip
@@ -235,19 +236,41 @@ def web():
        certbot_available=bool(shutil.which("certbot")),
        sysops_available=bool(extension.sysops and extension.sysops.available),
        local_names=webserver.local_names(),
+        nginx_zuschlag=uploads.NGINX_ZUSCHLAG_MB,
    )


@bp.post("/webserver")
@permission_required("settings_web.edit")
 def web_save():
+    extension = core()
+    conn = db()
+
+    # Die Uploadgrenze gilt fuer die Anwendung selbst; sie zu setzen braucht
+    # keine nginx-Lizenz. Deshalb steht sie **vor** der Lizenzpruefung: sonst
+    # waere das Feld auf einer Installation ohne nginx-Modul sichtbar, aber
+    # ohne Wirkung.
+    if request.form.get("web_max_body_mb"):
+        try:
+            with transaction():
+                extension.settings.set(
+                    conn,
+                    "web_max_body_mb",
+                    request.form["web_max_body_mb"],
+                    actor=current_user.username,
+                )
+            _audit("settings.upload_limit", request.form["web_max_body_mb"], severity="notice")
+        except ValueError as exc:
+            flash(str(exc), "danger")
+            return redirect(url_for("hostsettings.web"))
+
    problem = _license_hint("nginx")
    if problem:
+        # Ohne nginx-Modul bleibt es bei der Grenze -- der Rest des Formulars
+        # gehoert zum Webserver.
        flash(problem, "danger")
        return redirect(url_for("hostsettings.web"))

-    extension = core()
-    conn = db()
    try:
        domain = webserver.validate_domain(request.form.get("web_domain", ""))
    except ValueError as exc:
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"

 [project]
 name = "tesm-licensing"
-version = "2.1.2"
+version = "2.2.0"
 description = "Ed25519-basiertes Lizenz- und Aktivierungsprotokoll fuer TESM und TESM-Lizenzserver"
 requires-python = ">=3.11"
 dependencies = ["cryptography>=42"]