[FEATURE] Make Shipping methods be available based on cart conditions

Classes/Domain/Model/Cart/Service.php

@@ -203,18 +203,33 @@ public function getFallBackId(): ?int
 
     public function isAvailable(): bool
     {
+        $return = true;
+        // keep available.from and available.until even though this is redundant to ...
         if (isset($this->config['available'])) {
-            $availableFrom = $this->config['available']['from'];
-            if (isset($availableFrom) && $this->cart->getGross() < (float)$availableFrom) {
+            $availableFrom = $this->config['available']['from'] ?? false;
+            if ($availableFrom && $this->cart->getGross() < (float)$availableFrom) {
                 return false;
             }
-            $availableUntil = $this->config['available']['until'];
-            if (isset($availableUntil) && $this->cart->getGross() > (float)$availableUntil) {
+            $availableUntil = $this->config['available']['until'] ?? false;
+            if ($availableUntil && $this->cart->getGross() > (float)$availableUntil) {
                 return false;
             }
         }
 
-        return true;
+        if (isset($this->config['available']) && is_array($this->config['available']) && isset($this->config['available']['_typoScriptNodeValue'])) {
+            $availableType = $this->config['available']['_typoScriptNodeValue'];
+
+            $conditionValue = $this->getConditionValueFromCart($availableType);
+
+            $return = false;
+            foreach ($this->config['available'] as $availableKey => $availableValue) {
+                if (is_array($availableValue) && ((float)$availableValue['value']  <= (float)$conditionValue)) {
+                    $return = (bool) ($availableValue['available'] ?? false);
+                }
+            }
+        }
+
+        return $return;
     }
 
     public function isFree(): bool

Documentation/Administrator/Configuration/ShippingMethods/FlexibleAvailabilityForShipping/Index.rst

@@ -0,0 +1,104 @@
+.. include:: ../../../../Includes.txt
+
+..  _shipping_method_flex_availablility:
+
+============================
+Flexible availability for shipping
+============================
+
+It can be a requirement that the shipping method availability should depend on
+the products in the shopping cart. For these cases the extension provides a default
+implementation (see `cart/Classes/Domain/Model/Cart/Service.php`) with
+configuration options very similar to
+ :ref:`Flexible prices for shipping <shipping_method_flex_price>`.
+The implementation can be adapted to own needs by using the `ServiceInterface`
+also described in :ref:`Flexible prices for shipping <shipping_method_flex_price>`.
+
+.. code-block:: typoscript
+   :caption: Can be set in e.g. EXT:sitepackage/Configuration/TypoScript/setup.typoscript
+
+   plugin.tx_cart {
+    shippings {
+        countries {
+            de {
+                preset = 1
+                options {
+                    1 {
+                        title = PDF/Email
+                        taxClassId = 1
+                        fallBackId = 2
+                        status = open
+                        free {
+                            from = 0
+                        }
+                        available = by_number_of_physical_products
+                        available {
+                            0 {
+                                value = 0
+                                available = 1
+                            }
+                            2 {
+                                value = 1
+                                available = 0
+                            }
+                        }
+                    }
+
+                    2 {
+                        title = Standard Delivery
+                        taxClassId = 1
+                        fallBackId = 1
+                        status = open
+                        extra = 99.00
+                        available = by_number_of_physical_products
+                        available {
+                            0 {
+                                value = 0
+                                available = 0
+                            }
+                            2 {
+                                value = 1
+                                available = 1
+                            }
+                        }
+                    }
+                }
+            }
+        }
+   }
+
+plugin.tx_cart.shipping.countries.de
+====================================
+.. confval:: options.<n>.available
+
+   :Type: string
+
+   ============================== ===========================================
+   Setting                        Explanation what is used for the comparison
+   ============================== ===========================================
+   by_price                       The total price of the shopping cart.
+   by_price_of_physical_products  The total price of physical products in the shopping cart (EXT:cart_products allows to define products as "virtual producs").
+   by_quantity                    The amount of physical(!) products. (This is a synonym for `by_number_of_physical_products`)
+   by_number_of_physical_products The amount of physical products
+   by_number_of_virtual_products  The amount of virtual products
+   by_number_of_all_products      The amount of all products
+   by_service_attribute_1_sum     The sum of the values of `Service Attribute 1` of all products in the cart.
+   by_service_attribute_1_max     The highest value of `Service Attribute 1` of all product in the cart.
+   by_service_attribute_2_sum     The sum of the values of `Service Attribute 2` of all products in the cart.
+   by_service_attribute_2_max     The highest value of `Service Attribute 2` of all product in the cart.
+   by_service_attribute_3_sum     The sum of the values of `Service Attribute 3` of all products in the cart.
+   by_service_attribute_3_max     The highest value of `Service Attribute 3` of all product in the cart.
+   ============================== ===========================================
+
+
+.. confval:: options.<n>.available.<m>.value
+
+   :Type: int
+
+   Defines the matching condition.
+
+.. confval:: options.<n>.available.<m>.available
+
+   :Type: float
+
+   Boolean value to define whether the shipping method is available.

Documentation/Administrator/Configuration/ShippingMethods/Index.rst

@@ -289,3 +289,4 @@ See :ref:`plugin.tx_cart.settings.showCartAction.showPartials.shippingMethodForm
    :titlesonly:
 
    FlexiblePricesForShipping/Index
+   FlexibleAvailabilityForShipping/Index