initial checking of first attempt

composer.json

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+{
+  "name": "sysmocom/shopware6-address-latin",
+  "description": "latin character address enforcement",
+  "version": "0.0.1",
+  "type": "shopware-platform-plugin",
+  "license": "AGPL-3.0-or-later",
+  "authors": [
+	  {
+		  "name": "Harald Welte",
+		  "email": "hwelte@sysmocom.de",
+		  "role": "main developer"
+	  }
+  ],
+  "minimum-stability": "dev",
+  "repositories": [
+  ],
+  "require": {
+  },
+  "autoload": {
+    "psr-4": {
+      "SmcAddressLatin\\": "src/"
+    }
+  },
+  "extra": {
+    "shopware-plugin-class": "SmcAddressLatin\\SmcAddressLatin",
+    "label": {
+      "de-DE": "shipcloud latin character address validation",
+      "en-GB": "shipcloud latin character address validation"
+    }
+  }
+}

src/Core/Checkout/Cart/Error/ShippingCardInvalidCharactersError.php

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+namespace SmcAddressLatin\Core\Checkout\Cart\Error;
+
+use Shopware\Core\Checkout\Cart\Error\Error;
+
+class ShippingCardInvalidCharactersError extends Error
+{
+	private const KEY = 'address-invalid-characters';
+
+	private string $erroneousFieldName;
+
+	public function __construct(string $erroneousFieldName)
+	{
+		$this->erroneousFieldName = $erroneousFieldName;
+		parent::__construct();
+	}
+
+	public function getId(): string
+	{
+		return $this->erroneousFieldName;
+	}
+
+	public function getMessageKey(): string
+	{
+		return self::KEY;
+	}
+
+	public function getLevel(): int
+	{
+		return self::LEVEL_ERROR;
+	}
+
+	public function blockOrder(): bool
+	{
+		return true;
+	}
+
+	public function getParameters(): array
+	{
+		return [ 'erroneousFieldName' => $this->erroneousFieldName ];
+	}
+}

src/Core/Checkout/Cart/SmcCartValidator.php

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+// <plugin root>/src/Core/Checkout/Cart/SmcCartValidator.php
+<?php declare(strict_types=1);
+
+namespace SmcAddressLatin\Core\Checkout\Cart;
+
+use Shopware\Core\Checkout\Cart\Cart;
+use Shopware\Core\Checkout\Cart\CartValidatorInterface;
+use Shopware\Core\Checkout\Cart\Error\ErrorCollection;
+use Shopware\Core\System\SalesChannel\SalesChannelContext;
+use SmcAddressLatin\Core\Checkout\Cart\Error\ShippingAddressInvalidCharactersError;
+
+class SmcCartValidator implements CartValidatorInterface
+{
+    public function validate(Cart $cart, ErrorCollection $errorCollection, SalesChannelContext $salesChannelContext): void
+    {
+        $validateShipping = $cart->getLineItems()->count() === 0
+            || $cart->getLineItems()->hasLineItemWithState(State::IS_PHYSICAL);
+        if (!$validateShipping) {
+            return;
+        }
+
+        private static function contains_only_latin(string $input): bool {
+            if ($input === null) {
+                    return true;
+            }
+            if (preg_match('/[^\p{Common}\p{Latin}]/u', $input)) {
+                    return true;
+            }
+            return false;
+        }
+
+        $ship_addr = $context->getShippingLocation()->getAddress();
+        if (!$this->contains_only_latin($ship_addr->getFirstName())) {
+            $errors->add(new ShippingAddressInvalidCharactersError('First Name'));
+        }
+        if (!$this->contains_only_latin($ship_addr->getLastName())) {
+            $errors->add(new ShippingAddressInvalidCharactersError('Last Name'));
+        }
+        if (!$this->contains_only_latin($ship_addr->getCity()) {
+            $errors->add(new ShippingAddressInvalidCharactersError('City'));
+        }
+        if (!$this->contains_only_latin($ship_addr->getCompany()) {
+            $errors->add(new ShippingAddressInvalidCharactersError('Company'));
+        }
+        if (!$this->contains_only_latin($ship_addr->getDepartment()) {
+            $errors->add(new ShippingAddressInvalidCharactersError('Department'));
+        }
+        if (!$this->contains_only_latin($ship_addr->getTitle()) {
+            $errors->add(new ShippingAddressInvalidCharactersError('Title'));
+        }
+        if (!$this->contains_only_latin($ship_addr->getStreet()) {
+            $errors->add(new ShippingAddressInvalidCharactersError('Street'));
+        }
+        if (!$this->contains_only_latin($ship_addr->getAdditionalAddressLine1()) {
+            $errors->add(new ShippingAddressInvalidCharactersError('Additional Address Line 1'));
+        }
+        if (!$this->contains_only_latin($ship_addr->getAdditionalAddressLine2()) {
+            $errors->add(new ShippingAddressInvalidCharactersError('Additional Address Line 2'));
+        }
+        if (!$this->contains_only_latin($ship_addr->getSalutation()) {
+            $errors->add(new ShippingAddressInvalidCharactersError('Salutation'));
+        }
+    }
+}

src/Resources/config/services.xml

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+// <plugin root>/src/Resources/config/services.xml
+<?xml version="1.0" ?>
+<container xmlns="http://symfony.com/schema/dic/services"
+           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+           xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
+
+    <services>
+        <service id="SmcAddressLatin\Core\Checkout\Cart\SmcCartValidator">
+            <tag name="shopware.cart.validator"/>
+        </service>
+    </services>
+</container>

src/Resources/snippet/en_GB/error.en-GB.json

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+{
+	"checkout": {
+		"address-invalid-characters": "Shipping Address contains invalid characters."
+	},
+	"error": {
+		"address-invalid-characters": "Shipping Address contains invalid characters."
+	}
+}