Ability to limit available fiat currencies (#1748)

* feat: limit number of available fiat currencies
* feat: Add allowed currency selector to Admin UI
* motorinas suggestions

---------

Co-authored-by: dni ⚡ <office@dnilabs.com>

.env.example

@@ -52,6 +52,9 @@ LNBITS_RESERVE_FEE_MIN=2000
 # value in percent
 LNBITS_RESERVE_FEE_PERCENT=1.0
 
+# Limit fiat currencies allowed to see in UI
+# LNBITS_ALLOWED_CURRENCIES="EUR, USD"
+
 # Change theme
 LNBITS_SITE_TITLE="LNbits"
 LNBITS_SITE_TAGLINE="free and open-source lightning wallet"

lnbits/core/templates/admin/_tab_server.html

@@ -54,6 +54,20 @@
           <br />
         </div>
       </div>
+      <div class="row q-col-gutter-md">
+        <div class="col-12 col-md-6">
+          <p>Allowed currencies</p>
+          <q-select
+            filled
+            v-model="formData.lnbits_allowed_currencies"
+            multiple
+            hint="Limit the number of available fiat currencies"
+            label="Allowed currencies"
+            :options="{{ currencies | safe }}"
+          ></q-select>
+          <br />
+        </div>
+      </div>
       <div class="row q-col-gutter-md">
         <div class="col-12 col-md-6">
           <p>Admin Extensions</p>

lnbits/core/views/api.py

@@ -672,6 +672,12 @@ async def api_perform_lnurlauth(
 
 @core_app.get("/api/v1/currencies")
 async def api_list_currencies_available():
+    if len(settings.lnbits_allowed_currencies) > 0:
+        return [
+            item
+            for item in currencies.keys()
+            if item.upper() in settings.lnbits_allowed_currencies
+        ]
     return list(currencies.keys())
 
 

lnbits/core/views/generic.py

@@ -18,6 +18,7 @@ from lnbits.helpers import template_renderer, url_for
 from lnbits.settings import get_wallet_class, settings
 
 from ...extension_manager import InstallableExtension, get_valid_extensions
+from ...utils.exchange_rates import currencies
 from ..crud import (
     create_account,
     create_wallet,
@@ -400,6 +401,7 @@ async def index(request: Request, user: User = Depends(check_admin)):
             "user": user.dict(),
             "settings": settings.dict(),
             "balance": balance,
+            "currencies": list(currencies.keys()),
         },
     )
 

lnbits/settings.py

@@ -89,6 +89,7 @@ class ThemesSettings(LNbitsSettings):
         default="https://shop.lnbits.com/;/static/images/lnbits-shop-light.png;/static/images/lnbits-shop-dark.png"
     )  # sneaky sneaky
     lnbits_ad_space_enabled: bool = Field(default=False)
+    lnbits_allowed_currencies: List[str] = Field(default=[])
 
 
 class OpsSettings(LNbitsSettings):