feat: HMAC verification for web widget (#1643)

* feat: HMAC verification for web widget. Let you verify the authenticated contact via HMAC on the web widget to prevent data tampering.
* Add docs for identity-validation

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

app/javascript/widget/store/modules/conversation/getters.js

@@ -0,0 +1,52 @@
+import { MESSAGE_TYPE } from 'widget/helpers/constants';
+import groupBy from 'lodash.groupby';
+import { groupConversationBySender } from './helpers';
+import { formatUnixDate } from 'shared/helpers/DateHelper';
+
+export const getters = {
+  getAllMessagesLoaded: _state => _state.uiFlags.allMessagesLoaded,
+  getIsAgentTyping: _state => _state.uiFlags.isAgentTyping,
+  getConversation: _state => _state.conversations,
+  getConversationSize: _state => Object.keys(_state.conversations).length,
+  getEarliestMessage: _state => {
+    const conversation = Object.values(_state.conversations);
+    if (conversation.length) {
+      return conversation[0];
+    }
+    return {};
+  },
+  getGroupedConversation: _state => {
+    const conversationGroupedByDate = groupBy(
+      Object.values(_state.conversations),
+      message => formatUnixDate(message.created_at)
+    );
+    return Object.keys(conversationGroupedByDate).map(date => ({
+      date,
+      messages: groupConversationBySender(conversationGroupedByDate[date]),
+    }));
+  },
+  getIsFetchingList: _state => _state.uiFlags.isFetchingList,
+  getUnreadMessageCount: _state => {
+    const { userLastSeenAt } = _state.meta;
+    const count = Object.values(_state.conversations).filter(chat => {
+      const { created_at: createdAt, message_type: messageType } = chat;
+      const isOutGoing = messageType === MESSAGE_TYPE.OUTGOING;
+      const hasNotSeen = userLastSeenAt
+        ? createdAt * 1000 > userLastSeenAt * 1000
+        : true;
+      return hasNotSeen && isOutGoing;
+    }).length;
+    return count;
+  },
+  getUnreadTextMessages: (_state, _getters) => {
+    const unreadCount = _getters.getUnreadMessageCount;
+    const allMessages = [...Object.values(_state.conversations)];
+    const unreadAgentMessages = allMessages.filter(message => {
+      const { message_type: messageType } = message;
+      return messageType === MESSAGE_TYPE.OUTGOING;
+    });
+    const maxUnreadCount = Math.min(unreadCount, 3);
+    const allUnreadMessages = unreadAgentMessages.splice(-maxUnreadCount);
+    return allUnreadMessages;
+  },
+};