add function to determine max message size

Author: AlexNi245

packages/messenger-widget/src/hooks/messages/sizeLimit/checkIfEnvelopIsInSizeLimit.ts

@@ -0,0 +1,39 @@
+import { EncryptionEnvelop, getEnvelopSize } from '@dm3-org/dm3-lib-messaging';
+import { log } from '@dm3-org/dm3-lib-shared';
+import { ethers } from 'ethers';
+import { ContactPreview } from '../../../interfaces/utils';
+import { closeErrorModal, openErrorModal } from '../../../utils/common-utils';
+import { fetchMessageSizeLimit } from './fetchSizeLimit';
+
+export const checkIfEnvelopIsInSizeLimit = async (
+    mainnetProvider: ethers.providers.JsonRpcProvider,
+    recipient: ContactPreview,
+    encryptedEnvelop: EncryptionEnvelop,
+): Promise<boolean> => {
+    const account = recipient.contactDetails.account;
+
+    try {
+        const reciversSizeLimit = await fetchMessageSizeLimit(
+            mainnetProvider,
+            account,
+        );
+
+        const envelopSize = getEnvelopSize(encryptedEnvelop);
+
+        if (envelopSize > reciversSizeLimit) {
+            openErrorModal(
+                'The size of the message is larger than limit '
+                    .concat(reciversSizeLimit.toString(), ' bytes. ')
+                    .concat('Please reduce the message size.'),
+                false,
+                closeErrorModal,
+            );
+
+            return false;
+        }
+        return true;
+    } catch (error) {
+        log(error, 'message size limit');
+        return true;
+    }
+};

packages/messenger-widget/src/hooks/messages/sizeLimit/fetchSizeLimit.ts

@@ -0,0 +1,14 @@
+import { getDeliveryServiceProperties } from '@dm3-org/dm3-lib-delivery-api';
+import { Account } from '@dm3-org/dm3-lib-profile';
+import { ethers } from 'ethers';
+
+export const fetchMessageSizeLimit = async (
+    mainnetProvider: ethers.providers.StaticJsonRpcProvider,
+    account: Account,
+) => {
+    const details = await getDeliveryServiceProperties(
+        mainnetProvider as ethers.providers.JsonRpcProvider,
+        account as Account,
+    );
+    return details.sizeLimit;
+};