feat: allow configuring attachment upload limit (#12835)

## Summary
- add a configurable MAXIMUM_FILE_UPLOAD_SIZE installation setting and
surface it through super admin and global config payloads
- apply the configurable limit to attachment validations and shared
upload helpers on dashboard and widget
- introduce a reusable helper with unit tests for parsing the limit and
extend attachment specs for configurability


------
[Codex
Task](https://chatgpt.com/codex/tasks/task_e_6912644786b08326bc8dee9401af6d0a)

---------

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: iamsivin <iamsivin@gmail.com>

app/javascript/shared/constants/messages.js

@@ -34,9 +34,6 @@ export const CONVERSATION_PRIORITY_ORDER = {
   low: 1,
 };
 
-// Size in mega bytes
-export const MAXIMUM_FILE_UPLOAD_SIZE = 40;
-
 export const ALLOWED_FILE_TYPES =
   'image/*,' +
   'audio/*,' +

app/javascript/shared/helpers/FileHelper.js

@@ -1,3 +1,5 @@
+export const DEFAULT_MAXIMUM_FILE_UPLOAD_SIZE = 40;
+
 export const formatBytes = (bytes, decimals = 2) => {
   if (bytes === 0) return '0 Bytes';
 
@@ -19,3 +21,13 @@ export const checkFileSizeLimit = (file, maximumUploadLimit) => {
   const fileSizeInMB = fileSizeInMegaBytes(fileSize);
   return fileSizeInMB <= maximumUploadLimit;
 };
+
+export const resolveMaximumFileUploadSize = value => {
+  const parsedValue = Number(value);
+
+  if (!Number.isFinite(parsedValue) || parsedValue <= 0) {
+    return DEFAULT_MAXIMUM_FILE_UPLOAD_SIZE;
+  }
+
+  return parsedValue;
+};

app/javascript/shared/helpers/specs/FileHelper.spec.js

@@ -1,7 +1,9 @@
 import {
+  DEFAULT_MAXIMUM_FILE_UPLOAD_SIZE,
   formatBytes,
   fileSizeInMegaBytes,
   checkFileSizeLimit,
+  resolveMaximumFileUploadSize,
 } from '../FileHelper';
 
 describe('#File Helpers', () => {
@@ -19,6 +21,7 @@ describe('#File Helpers', () => {
       expect(formatBytes(10000000)).toBe('9.54 MB');
     });
   });
+
   describe('fileSizeInMegaBytes', () => {
     it('should return zero if 0 is passed', () => {
       expect(fileSizeInMegaBytes(0)).toBe(0);
@@ -27,6 +30,7 @@ describe('#File Helpers', () => {
       expect(fileSizeInMegaBytes(20000000)).toBeCloseTo(19.07, 2);
     });
   });
+
   describe('checkFileSizeLimit', () => {
     it('should return false if file with size 62208194 and file size limit 40 are passed', () => {
       expect(checkFileSizeLimit({ file: { size: 62208194 } }, 40)).toBe(false);
@@ -35,4 +39,26 @@ describe('#File Helpers', () => {
       expect(checkFileSizeLimit({ file: { size: 199154 } }, 40)).toBe(true);
     });
   });
+
+  describe('resolveMaximumFileUploadSize', () => {
+    it('should return default when value is undefined', () => {
+      expect(resolveMaximumFileUploadSize(undefined)).toBe(
+        DEFAULT_MAXIMUM_FILE_UPLOAD_SIZE
+      );
+    });
+
+    it('should return default when value is not a positive number', () => {
+      expect(resolveMaximumFileUploadSize('not-a-number')).toBe(
+        DEFAULT_MAXIMUM_FILE_UPLOAD_SIZE
+      );
+      expect(resolveMaximumFileUploadSize(-5)).toBe(
+        DEFAULT_MAXIMUM_FILE_UPLOAD_SIZE
+      );
+    });
+
+    it('should parse numeric strings and numbers', () => {
+      expect(resolveMaximumFileUploadSize('50')).toBe(50);
+      expect(resolveMaximumFileUploadSize(75)).toBe(75);
+    });
+  });
 });

app/javascript/shared/store/globalConfig.js

@@ -1,4 +1,5 @@
 import { parseBoolean } from '@chatwoot/utils';
+import { resolveMaximumFileUploadSize } from 'shared/helpers/FileHelper';
 
 const {
   API_CHANNEL_NAME: apiChannelName,
@@ -11,6 +12,7 @@ const {
   DIRECT_UPLOADS_ENABLED: directUploadsEnabled,
   DISPLAY_MANIFEST: displayManifest,
   GIT_SHA: gitSha,
+  MAXIMUM_FILE_UPLOAD_SIZE: maximumFileUploadSize,
   HCAPTCHA_SITE_KEY: hCaptchaSiteKey,
   INSTALLATION_NAME: installationName,
   LOGO_THUMBNAIL: logoThumbnail,
@@ -37,6 +39,7 @@ const state = {
   disableUserProfileUpdate: parseBoolean(disableUserProfileUpdate),
   displayManifest,
   gitSha,
+  maximumFileUploadSize: resolveMaximumFileUploadSize(maximumFileUploadSize),
   hCaptchaSiteKey,
   installationName,
   logo,