feat: Add legal PDF download link in footer navigation

Website/main.py

@@ -10,6 +10,8 @@ import shutil
 import tarfile
 import tempfile
 import threading
+import unicodedata
+import zipfile
 import smtplib
 from datetime import timedelta, datetime, date
 from functools import wraps
@@ -93,6 +95,31 @@ def set_security_headers(response):
 BASE_DIR = os.path.dirname(os.path.abspath(__file__))
 INVOICE_UPLOAD_DIR = os.path.join(BASE_DIR, "static", "uploads", "invoices")
 TUTORIAL_UPLOAD_DIR = os.path.join(BASE_DIR, "static", "uploads", "tutorials")
+LEGAL_DOWNLOAD_DIR = os.path.join(BASE_DIR, "static", "downloads", "legal")
+LEGAL_DOWNLOAD_FILES = (
+    (
+        "nutzungsbedingungen.pdf",
+        "Nutzungsbedingungen",
+        [
+            "Invario UG Modul Suite",
+            "PDF-Export der Nutzungsbedingungen",
+            "",
+            "Die aktuelle HTML-Version finden Sie unter /nutzungsbedingungen.",
+            "Dieser Download wird vom Server als PDF bereitgestellt.",
+        ],
+    ),
+    (
+        "datenschutz.pdf",
+        "Datenschutzerklaerung",
+        [
+            "Invario UG Modul Suite",
+            "PDF-Export der Datenschutzerklaerung",
+            "",
+            "Die aktuelle HTML-Version finden Sie unter /datenschutz.",
+            "Dieser Download wird vom Server als PDF bereitgestellt.",
+        ],
+    ),
+)
 MONGO_URI = os.environ.get("MONGO_URI", "mongodb://localhost:27017")
 MONGO_DB_NAME = os.environ.get("MONGO_DB_NAME", "Invario_Website")
 INSTANCE_REPO_URL = os.environ.get("INSTANCE_REPO_URL", "https://github.com/AIIrondev/legendary-octo-garbanzo")
@@ -169,6 +196,79 @@ def _is_allowed_tutorial_video_filename(filename: str) -> bool:
     return lowered.endswith(".mp4") or lowered.endswith(".webm") or lowered.endswith(".ogv") or lowered.endswith(".ogg") or lowered.endswith(".m4v")
 
 
+def _pdf_safe_text(value: str) -> str:
+    text = unicodedata.normalize("NFKD", value or "")
+    text = text.encode("ascii", "ignore").decode("ascii")
+    return text.replace("\\", "\\\\").replace("(", "\\(").replace(")", "\\)")
+
+
+def _build_simple_pdf_bytes(title: str, lines: list[str]) -> bytes:
+    buffer = BytesIO()
+
+    def write(text: str) -> None:
+        buffer.write(text.encode("latin-1"))
+
+    content_lines = ["BT", "/F1 20 Tf", "72 760 Td", f"({_pdf_safe_text(title)}) Tj", "/F1 11 Tf"]
+    y_position = 730
+    for line in lines:
+        if not line:
+            y_position -= 14
+            continue
+        content_lines.append(f"1 0 0 1 72 {y_position} Tm")
+        content_lines.append(f"({_pdf_safe_text(line)}) Tj")
+        y_position -= 16
+    content_lines.append("ET")
+    content = "\n".join(content_lines).encode("latin-1")
+
+    write("%PDF-1.4\n%\xe2\xe3\xcf\xd3\n")
+    offsets = [0]
+
+    def write_object(object_number: int, body: str) -> None:
+        offsets.append(buffer.tell())
+        write(f"{object_number} 0 obj\n{body}\nendobj\n")
+
+    write_object(1, "<< /Type /Catalog /Pages 2 0 R >>")
+    write_object(2, "<< /Type /Pages /Kids [3 0 R] /Count 1 >>")
+    write_object(
+        3,
+        "<< /Type /Page /Parent 2 0 R /MediaBox [0 0 595 842] /Resources << /Font << /F1 4 0 R >> >> /Contents 5 0 R >>",
+    )
+    write_object(4, "<< /Type /Font /Subtype /Type1 /BaseFont /Helvetica >>")
+    offsets.append(buffer.tell())
+    write(f"5 0 obj\n<< /Length {len(content)} >>\nstream\n")
+    buffer.write(content)
+    write("\nendstream\nendobj\n")
+
+    xref_start = buffer.tell()
+    write("xref\n0 6\n")
+    write("0000000000 65535 f \n")
+    for offset in offsets[1:]:
+        write(f"{offset:010d} 00000 n \n")
+    write("trailer\n<< /Size 6 /Root 1 0 R >>\nstartxref\n")
+    write(f"{xref_start}\n%%EOF\n")
+    return buffer.getvalue()
+
+
+def _ensure_legal_pdf_files() -> None:
+    os.makedirs(LEGAL_DOWNLOAD_DIR, exist_ok=True)
+    for filename, title, lines in LEGAL_DOWNLOAD_FILES:
+        target_path = os.path.join(LEGAL_DOWNLOAD_DIR, filename)
+        if os.path.exists(target_path):
+            continue
+        with open(target_path, "wb") as pdf_file:
+            pdf_file.write(_build_simple_pdf_bytes(title, lines))
+
+
+def _build_legal_pdf_bundle() -> BytesIO:
+    _ensure_legal_pdf_files()
+    bundle = BytesIO()
+    with zipfile.ZipFile(bundle, mode="w", compression=zipfile.ZIP_DEFLATED) as archive:
+        for filename, _, _ in LEGAL_DOWNLOAD_FILES:
+            archive.write(os.path.join(LEGAL_DOWNLOAD_DIR, filename), arcname=filename)
+    bundle.seek(0)
+    return bundle
+
+
 def _save_invoice_pdf(file_obj, invoice_number: str) -> str | None:
     if not file_obj or not file_obj.filename:
         return None
@@ -2689,6 +2789,7 @@ def my_instance_management():
 @login_required
 def my_tutorials():
     """Display tutorial videos for the logged-in user."""
+    origin = request.url_root.rstrip('/')
     tutorials = [
         {
             "_id": "1",
@@ -3063,6 +3164,17 @@ def impressum():
 def nutzungsbedingungen():
     return render_template("nutzungsbedingungen.html")
 
+
+@app.route('/downloads/rechtliches')
+def download_legal_pdfs_bundle():
+    bundle = _build_legal_pdf_bundle()
+    return send_file(
+        bundle,
+        mimetype="application/zip",
+        as_attachment=True,
+        download_name="invario-rechtliche-dokumente.zip",
+    )
+
 @app.route('/logout')
 def logout():
     session.pop('username', None)

Website/templates/base.html

@@ -611,7 +611,7 @@
                     <ul class="footer-links">
                         <li><a href="{{ url_for('datenschutz') }}">Datenschutz</a></li>
                         <li><a href="{{ url_for('impressum') }}">Impressum</a></li>
-                        <li><a href="{{ url_for('nutzungsbedingungen') }}">Nutzungsbedingungen</a></li>
+                        <li><a href="{{ url_for('download_legal_pdfs_bundle') }}">PDF-Download</a></li>
                     </ul>
                 </div>
             </div>