add token based foldershare

app.py

@@ -43,6 +43,7 @@ app.add_url_rule('/dashboard', view_func=a.dashboard)
 app.add_url_rule('/connections', view_func=a.connections)
 app.add_url_rule('/mylinks', view_func=auth.mylinks)
 app.add_url_rule('/remove_secret', view_func=auth.remove_secret, methods=['POST'])
+app.add_url_rule('/remove_token', view_func=auth.remove_token, methods=['POST'])
 app.add_url_rule('/search', view_func=search.search, methods=['GET'])
 app.add_url_rule('/searchcommand', view_func=search.searchcommand, methods=['POST'])
 

auth.py

@@ -6,21 +6,27 @@ import os
 import json
 import qrcode
 import base64
+from typing import Dict, Any
+
+import zlib
+import hmac
+import hashlib
+
 
-folder_config = {}
 
 with open("app_config.json", 'r') as file:
     app_config = json.load(file)
 
+with open('folder_permission_config.json') as file:
+    folder_config = json.load(file)
+
+
 def require_secret(f):
     @wraps(f)
     def decorated_function(*args, **kwargs):
-        global folder_config 
+        global app_config, folder_config 
-        if not folder_config:
-            with open('folder_permission_config.json') as file:
-                folder_config = json.load(file)
 
-        def is_valid(config_item, provided_secret):
+        def is_valid_secret(config_item, provided_secret):
             """
             Checks if today's date is <= validity date
             AND if the provided secret matches config_item['secret'].
@@ -36,36 +42,50 @@ def require_secret(f):
                 provided_secret == config_item['secret']
             )
 
-        # 1) Get secret from query params (if any)
+        # 1) Get secretand token from query params (if any)
         args_secret = request.args.get('secret')
+        args_token = request.args.get('token')
 
-        # 2) Initialize 'allowed_secrets' in the session if missing
+        # 2) Initialize 'valid_secrets' in the session if missing
-        if 'allowed_secrets' not in session:
+        if 'valid_secrets' not in session:
-            session['allowed_secrets'] = []
+            session['valid_secrets'] = []
+            
+        if 'valid_tokens' not in session:
+            session['valid_tokens'] = []
 
         # 3) If a new secret is provided, check if it’s valid, and add to session if so
         if args_secret:
             for config_item in folder_config:
-                if is_valid(config_item, args_secret):
+                if is_valid_secret(config_item, args_secret):
-                    if args_secret not in session['allowed_secrets']:
+                    if args_secret not in session['valid_secrets']:
-                        session['allowed_secrets'].append(args_secret)
+                        session['valid_secrets'].append(args_secret)
                     session.permanent = True  # Make the session permanent
                     
-        # 4) Re-check validity of each secret in session['allowed_secrets']
+        if args_token:
+            if is_valid_token(args_token):
+                if args_token not in session['valid_tokens']:
+                    session['valid_tokens'].append(args_token)
+                session.permanent = True  # Make the session permanent
+
+        # 4) Re-check validity of each secret and token to also catch previous ones
         #    If a secret is no longer valid (or not in config), remove it.
-        for secret_in_session in session['allowed_secrets'][:]:
+        for secret_in_session in session['valid_secrets'][:]:
             # Find the current config item with matching secret
             config_item = next(
                 (c for c in folder_config if c['secret'] == secret_in_session),
                 None
             )
             # If the config item doesn’t exist or is invalid, remove secret
-            if config_item is None or not is_valid(config_item, secret_in_session):
+            if config_item is None or not is_valid_secret(config_item, secret_in_session):
-                session['allowed_secrets'].remove(secret_in_session)
+                session['valid_secrets'].remove(secret_in_session)
+
+        for token_in_session in session['valid_tokens'][:]:
+            if not is_valid_token(token_in_session):
+                session['valid_tokens'].remove(token_in_session)
 
         # 5) Build session['folders'] fresh from the valid secrets
         session['folders'] = {}
-        for secret_in_session in session.get('allowed_secrets', []):
+        for secret_in_session in session.get('valid_secrets', []):
             config_item = next(
                 (c for c in folder_config if c['secret'] == secret_in_session),
                 None
@@ -74,6 +94,11 @@ def require_secret(f):
                 for folder_info in config_item['folders']:
                     session['folders'][folder_info['foldername']] = folder_info['folderpath']
 
+        for token_in_session in session.get('valid_tokens', []):
+            token_item = decode_secret_key_compressed(token_in_session)
+            for folder_info in token_item['folders']:
+                session['folders'][folder_info['foldername']] = folder_info['folderpath']
+
         # 6) If we have folders, proceed; otherwise show index
         if session['folders']:
             # assume since visitor has a valid secret, they are ok with annonymous tracking
@@ -100,16 +125,24 @@ def require_secret(f):
 
 @require_secret
 def mylinks():
-    allowed_secrets = session.get('allowed_secrets', [])
+    scheme = request.scheme  # current scheme (http or https)
+    valid_secrets = session.get('valid_secrets', [])
+    valid_tokens = session.get('valid_tokens', [])
     host = request.host
 
     secret_qr_codes = {}
     secret_folders = {}
+    secret_url = {}
     secret_valid_to = {}
 
+    token_qr_codes = {}
+    token_folders = {}
+    token_url = {}
+    token_valid_to = {}
+
     # Build a QR code for each secret (using the URL with the secret as query parameter)
-    for secret in allowed_secrets:
+    for secret in valid_secrets:
-        url = f"https://{host}?secret={secret}"
+        url = f"{scheme}://{host}?secret={secret}"
         qr = qrcode.QRCode(version=1, box_size=10, border=4)
         qr.add_data(url)
         qr.make(fit=True)
@@ -123,28 +156,218 @@ def mylinks():
         # Lookup folder info and valid-to date for this secret from the global folder_config.
         config_item = next((c for c in folder_config if c['secret'] == secret), None)
         if config_item:
-            secret_folders[secret] = config_item['folders']
+            secret_folders[secret]  = config_item.get('folders')
+            secret_url[secret] = url
             secret_valid_to[secret] = config_item.get('validity', 'Unbekannt')
-        else:
+
-            secret_folders[secret] = []
+    for token in valid_tokens:
-            secret_valid_to[secret] = 'Unbekannt'
+        url = f"{scheme}://{host}?token={token}"
+        qr = qrcode.QRCode(version=1, box_size=10, border=4)
+        qr.add_data(url)
+        qr.make(fit=True)
+        img = qr.make_image(fill_color="black", back_color="white")
+        buffer = io.BytesIO()
+        img.save(buffer, format="PNG")
+        buffer.seek(0)
+        img_base64 = base64.b64encode(buffer.getvalue()).decode('ascii')
+        token_qr_codes[token] = img_base64
+        
+        token_item = decode_secret_key_compressed(token)
+        token_folders[token]  = token_item.get('folders')
+        token_url[token] = url
+        token_valid_to[token] = token_item.get('validity', 'Unbekannt')
 
     return render_template('mylinks.html',
-                           allowed_secrets=allowed_secrets,
+                            valid_secrets=valid_secrets,
-                           secret_qr_codes=secret_qr_codes,
+                            secret_qr_codes=secret_qr_codes,
-                           secret_folders=secret_folders,
+                            secret_folders=secret_folders,
-                           secret_valid_to=secret_valid_to)
+                            secret_url=secret_url,
+                            secret_valid_to=secret_valid_to,
+                            
+                            valid_tokens=valid_tokens,
+                            token_qr_codes=token_qr_codes,
+                            token_folders=token_folders,
+                            token_url=token_url,
+                            token_valid_to=token_valid_to
+                           )
 
 
 def remove_secret():
     secret_to_remove = request.form.get('secret')
-    allowed_secrets = session.get('allowed_secrets', [])
+    valid_secrets = session.get('valid_secrets', [])
-    if secret_to_remove in allowed_secrets:
+    if secret_to_remove in valid_secrets:
-        allowed_secrets.remove(secret_to_remove)
+        valid_secrets.remove(secret_to_remove)
-        session['allowed_secrets'] = allowed_secrets
+        session['valid_secrets'] = valid_secrets
     return redirect(url_for('mylinks'))
 
-    return render_template('mylinks.html',
+def remove_token():
-                           allowed_secrets=allowed_secrets,
+    token_to_remove = request.form.get('token')
-                           secret_qr_codes=secret_qr_codes,
+    valid_tokens = session.get('valid_tokens', [])
-                           secret_folders=secret_folders)
+    if token_to_remove in valid_tokens:
+        valid_tokens.remove(token_to_remove)
+        session['valid_tokens'] = valid_tokens
+    return redirect(url_for('mylinks'))
+
+def is_valid_token(secret_key: str, hmac_length: int = 32) -> bool:
+    """
+    Check whether the token is authentic _and_ its payload's "validity"
+    date has not yet passed.
+
+    Returns True if:
+      - signature matches (via decode_secret_key_compressed)
+      - the payload contains a "validity" field in DD.MM.YYYY format
+      - today's date <= validity date
+
+    Otherwise returns False.
+    """
+    try:
+        payload = decode_secret_key_compressed(secret_key, hmac_length)
+    except ValueError:
+        return False
+
+    validity = payload.get("validity")
+    if not isinstance(validity, str):
+        return False
+
+    try:
+        day, month, year = map(int, validity.split('.'))
+        expiry = datetime(year, month, day).date()
+    except Exception:
+        # malformed date
+        return False
+
+    return datetime.now().date() <= expiry
+
+
+# Define your key map: long → short
+KEY_MAP = {
+    "validity":    "v",
+    "folders":     "f",
+    "foldername":  "n",
+    "folderpath":  "p",
+}
+# Build the inverse map automatically
+INV_KEY_MAP = {short: long for long, short in KEY_MAP.items()}
+
+def _shorten_keys(obj: Any, mapping: Dict[str,str]) -> Any:
+    """Recursively replace dict keys via mapping."""
+    if isinstance(obj, dict):
+        return {
+            mapping.get(k, k): _shorten_keys(v, mapping)
+            for k, v in obj.items()
+        }
+    elif isinstance(obj, list):
+        return [_shorten_keys(v, mapping) for v in obj]
+    else:
+        return obj
+
+def generate_secret_key_compressed(
+    payload: dict,
+    hmac_length: int = 32
+) -> str:
+    """
+    Compress & sign a JSON payload, with short keys and variable HMAC slice.
+
+    Args:
+      payload: your original dict
+      hmac_length: how many chars of the URL-safe base64 HMAC to include
+
+    Returns:
+      A token: base64(zlib(json_short)) + signature[:hmac_length] + length_hex(4)
+    """
+    salt = app_config["SALT"]
+
+    # 1) Shorten keys, dump to bytes
+    short = _shorten_keys(payload, KEY_MAP)
+    raw = json.dumps(short, separators=(',', ':'), ensure_ascii=False).encode('utf-8')
+
+    # 2) Compress
+    comp = zlib.compress(raw, level=9)
+
+    # 3) Base64-url encode, strip padding
+    encoded = base64.urlsafe_b64encode(comp).decode('utf-8').rstrip('=')
+
+    # 4) 4-digit hex length of compressed bytes
+    length_hex = f"{len(comp):04X}"
+
+    # 5) HMAC over (encoded + length_hex)
+    msg = (encoded + length_hex).encode('utf-8')
+    digest = hmac.new(salt.encode(), msg, hashlib.sha256).digest()
+    full_sig = base64.urlsafe_b64encode(digest).decode('utf-8')
+    signature = full_sig[:hmac_length]
+
+    return f"{encoded}{signature}{length_hex}"
+
+
+def decode_secret_key_compressed(
+    secret_key: str,
+    hmac_length: int = 32
+) -> dict:
+    """
+    Reverse of generate_secret_key_compressed:
+      - verify signature (using same hmac_length)
+      - base64-decode → zlib-decompress → JSON
+      - restore original keys
+    """
+    salt = app_config["SALT"]
+    min_len = hmac_length + 4
+    if len(secret_key) < min_len:
+        raise ValueError("Key too short.")
+
+    # Extract pieces
+    length_hex = secret_key[-4:]
+    signature  = secret_key[-(hmac_length+4):-4]
+    encoded    = secret_key[:-(hmac_length+4)]
+
+    try:
+        comp_len = int(length_hex, 16)
+    except ValueError:
+        raise ValueError("Invalid length prefix.")
+
+    # Verify HMAC
+    msg = (encoded + length_hex).encode('utf-8')
+    expected = hmac.new(salt.encode(), msg, hashlib.sha256).digest()
+    full_sig = base64.urlsafe_b64encode(expected).decode('utf-8')
+    if not hmac.compare_digest(signature, full_sig[:hmac_length]):
+        raise ValueError("Invalid signature.")
+
+    # Decode & decompress
+    padding = '=' * (-len(encoded) % 4)
+    comp = base64.urlsafe_b64decode(encoded + padding)
+    if len(comp) != comp_len:
+        raise ValueError("Compressed-length mismatch.")
+    raw = zlib.decompress(comp).decode('utf-8')
+
+    # Load JSON and restore long keys
+    short = json.loads(raw)
+    def _restore(obj: Any) -> Any:
+        if isinstance(obj, dict):
+            return {
+                INV_KEY_MAP.get(k, k): _restore(v)
+                for k, v in obj.items()
+            }
+        elif isinstance(obj, list):
+            return [_restore(v) for v in obj]
+        else:
+            return obj
+
+    return _restore(short)
+
+
+# --- example usage ---
+if __name__ == '__main__':
+    payload = {
+        "validity": "31.12.2025",
+        "folders": [
+            {
+                "foldername": "20.04.2025 Ostersonntag",
+                "folderpath": r"\\192.168.10.10\docker2\sync-bethaus\syncfiles\folders\Gottesdienste Speyer\2025\04. April\20.04.2025 Ostersonntag"
+            }
+        ]
+    }
+
+    token = generate_secret_key_compressed(payload)
+    print("Token:", token)
+
+    result = decode_secret_key_compressed(token)
+    print("Decoded payload:", result)

keygen.py

@@ -1,100 +0,0 @@
-import hmac
-import hashlib
-import base64
-
-salt = "UqEEf08yMDE3qIQodAGAyNQ2EPFhb26f2o85MTIyMeAAkqlANiXcF"
-
-def generate_secret_key(identifier: str, expiry: str) -> str:
-    """
-    Generate a secret key with the following structure:
-      - encoded_data: Base64 encoding of (identifier + expiry)
-      - signature: 32 characters from the URL-safe base64 HMAC signature
-      - id_length_hex: 2-character hexadecimal number representing the length of the identifier
-    The HMAC is computed over (encoded_data + id_length_hex).
-    """
-    global salt
-    if len(identifier) > 255:
-        raise ValueError("Identifier must be at most 255 characters long.")
-    if len(expiry) != 8:
-        raise ValueError("Expiry must be an 8-character string in DDMMYYYY format.")
-    
-    # Concatenate identifier and expiry, then base64 encode the result.
-    plain_data = identifier + expiry
-    # Remove padding for compactness; we'll add it back during decoding.
-    encoded_data = base64.urlsafe_b64encode(plain_data.encode()).decode().rstrip("=")
-    
-    # Format the length of the identifier as a 2-digit hexadecimal string.
-    id_length_hex = f"{len(identifier):02X}"
-    
-    # Build the message for HMAC: encoded_data + id_length_hex.
-    message = encoded_data + id_length_hex
-    
-    # Compute HMAC using SHA-256.
-    hmac_digest = hmac.new(salt.encode(), message.encode(), hashlib.sha256).digest()
-    
-    # Get a URL-safe base64 representation and take the first 32 characters as the signature.
-    signature = base64.urlsafe_b64encode(hmac_digest).decode()[:32]
-    
-    # Construct the final secret key.
-    secret_key = encoded_data + signature + id_length_hex
-    return secret_key
-
-def decode_secret_key(secret_key: str):
-    """
-    Decode the secret key and extract the identifier and expiry.
-    
-    Token structure:
-      - encoded_data: secret_key[0 : (len(secret_key)-34)] (variable length)
-      - signature: secret_key[-34:-2] (32 characters)
-      - id_length_hex: secret_key[-2:] (2 characters)
-    
-    The HMAC is verified over (encoded_data + id_length_hex). Then, encoded_data is base64-decoded 
-    (with proper padding added) to yield (identifier + expiry), where the last 8 characters represent expiry.
-    The identifier length is determined from id_length_hex.
-    """
-    global salt
-    
-    if len(secret_key) < 34:  # Must at least have signature (32) + id_length_hex (2)
-        raise ValueError("Invalid key length.")
-    
-    # Extract the last 2 characters: id_length_hex.
-    id_length_hex = secret_key[-2:]
-    try:
-        id_length = int(id_length_hex, 16)
-    except ValueError:
-        raise ValueError("Invalid identifier length prefix in key.")
-    
-    # The signature is the 32 characters preceding the last 2.
-    signature = secret_key[-34:-2]
-    # The remainder is the encoded_data.
-    encoded_data = secret_key[:-34]
-    
-    # Verify the signature.
-    message = encoded_data + id_length_hex
-    expected_hmac = hmac.new(salt.encode(), message.encode(), hashlib.sha256).digest()
-    expected_signature = base64.urlsafe_b64encode(expected_hmac).decode()[:32]
-    
-    if not hmac.compare_digest(signature, expected_signature):
-        raise ValueError("Invalid key signature.")
-    
-    # Base64-decode the encoded_data.
-    # Add back any missing '=' padding.
-    padding = '=' * (-len(encoded_data) % 4)
-    plain_data = base64.urlsafe_b64decode(encoded_data + padding).decode()
-    
-    # plain_data should be (identifier + expiry), where expiry is the last 8 characters.
-    if len(plain_data) != id_length + 8:
-        raise ValueError("Decoded data length does not match expected identifier length and expiry.")
-    
-    identifier = plain_data[:id_length]
-    expiry = plain_data[id_length:]
-    
-    return identifier, expiry
-
-
-if __name__ == '__main__':
-    key = generate_secret_key("Besondere Gottesdienste", "30042025")
-    print(key)
-    identifier, expiry = decode_secret_key(key)
-    print("identifier:", identifier)
-    print("expiry:", expiry)

templates/mylinks.html

@@ -41,9 +41,9 @@
     </nav>
 
     <div class="container-fluid">
-      {% if allowed_secrets %}
+      <div class="row">
-        <div class="row">
+        {% if valid_secrets %}
-          {% for secret in allowed_secrets %}
+          {% for secret in valid_secrets %}
             <div class="col-md-4 mb-4">
               <div class="card h-100 shadow-sm">
                 <img src="data:image/png;base64,{{ secret_qr_codes[secret] }}" class="card-img-top qr-code p-3" alt="QR Code for secret">
@@ -51,7 +51,7 @@
                   <h5 class="card-title">Geheimnis: {{ secret }}</h5>
                   <p class="card-text">
                     <a href="https://{{ request.host }}?secret={{ secret }}" class="text-decoration-none">
-                      https://{{ request.host }}?secret={{ secret }}
+                      {{ secret_url[secret] }}
                     </a>
                   </p>
                   <p class="card-text">
@@ -77,12 +77,49 @@
               </div>
             </div>
           {% endfor %}
-        </div>
+        {% endif %}
-      {% else %}
+        {% if valid_tokens %}
-        <div class="alert alert-warning" role="alert">
+          {% for token in valid_tokens %}
-          Du hast aktuell keine gültigen Links.
+            <div class="col-md-4 mb-4">
-        </div>
+              <div class="card h-100 shadow-sm">
-      {% endif %}
+                <img src="data:image/png;base64,{{ token_qr_codes[token] }}" class="card-img-top qr-code p-3" alt="QR Code for token">
+                <div class="card-body">
+                  <h5 class="card-title">Token-Link:</h5>
+                  <p class="card-text">
+                    <a href="https://{{ request.host }}?token={{ token }}" class="text-decoration-none">
+                      {{ token_url[token] }}
+                    </a>
+                  </p>
+                  <p class="card-text">
+                    <small class="text-muted">Gültig bis: {{ token_valid_to[token] }}</small>
+                  </p>
+                  <form method="post" action="{{ url_for('remove_token') }}" class="mt-3">
+                    <input type="hidden" name="token" value="{{ token }}">
+                    <button type="submit" class="btn btn-danger btn-sm">Link entfernen</button>
+                  </form>
+                  {% if token_folders[token] %}
+                    <h6 class="mt-3">Ordner</h6>
+                    <ul class="list-group list-group-flush">
+                      {% for folder in token_folders[token] %}
+                        <li class="list-group-item">
+                          <strong>{{ folder.foldername }}</strong>
+                        </li>
+                      {% endfor %}
+                    </ul>
+                  {% else %}
+                    <p class="text-muted">Keine Ordner für dieses Gemeimnis hinterlegt.</p>
+                  {% endif %}
+                </div>
+              </div>
+            </div>
+          {% endfor %}
+        {% endif %}
+        {% if not valid_secrets and not valid_tokens %}
+          <div class="alert alert-warning" role="alert">
+            Du hast aktuell keine gültigen Links.
+          </div>
+        {% endif %}
+      </div>
     </div>
     <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>
   </body>