feat: Disable levels of encryptions by default

- Add `allow_client_encryption_key` option to allow encryption key provided by
  the client on the web UI (false by default)
- Add `allow_no_encryption` option to allow notes without encryption (disabled
  by default)

Signed-off-by: Julien Riou <julien@riou.xyz>

src/server/templates/index.html

@@ -13,6 +13,7 @@
         </div>
         <div class="container text-center justify-content-center w-75 mb-4">
             <div class="row align-items-center">
+                {{if .AllowClientEncryptionKey}}
                 <div class="col-1">
                     <label class="col-form-label col-form-label-sm" for="encryption-key">Encryption key</label>
                 </div>
@@ -21,11 +22,14 @@
                         title="Letters and numbers with length from 16 to 256" class="form-control" id="encryption-key"
                         name="encryption-key">
                 </div>
+                {{end}}
+                {{if .AllowNoEncryption}}
                 <div class="col-1">
                     <input type="checkbox" class="form-check-input" for="no-encryption-key" id="no-encryption-key"
                         value="no-encryption-key" name="no-encryption-key">
                     <label class="col-form-label col-form-label-sm" for="no-encryption-key">No encryption</label>
                 </div>
+                {{end}}
                 <div class="col-1">
                     <input type="checkbox" class="form-check-input" for="delete-after-read" id="delete-after-read"
                         value="delete-after-read" name="delete-after-read">
@@ -40,7 +44,8 @@
                     <select class="form-select" aria-label="Expiration" id="expiration" name="expiration">
                         <option disabled>Expiration</option>
                         {{range $exp := .Expirations}}
-                        <option {{ if eq $exp $.Expiration }}selected="selected"{{end}} value="{{$exp}}">{{HumanDuration $exp}}</option>
+                        <option {{ if eq $exp $.Expiration }}selected="selected" {{end}} value="{{$exp}}">
+                            {{HumanDuration $exp}}</option>
                         {{end}}
                     </select>
                 </div>