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/actions.js

@@ -0,0 +1,92 @@
+import {
+  sendMessageAPI,
+  getMessagesAPI,
+  sendAttachmentAPI,
+  toggleTyping,
+  setUserLastSeenAt,
+} from 'widget/api/conversation';
+
+import { createTemporaryMessage, onNewMessageCreated } from './helpers';
+
+export const actions = {
+  sendMessage: async ({ commit }, params) => {
+    const { content } = params;
+    commit('pushMessageToConversation', createTemporaryMessage({ content }));
+    await sendMessageAPI(content);
+  },
+
+  sendAttachment: async ({ commit }, params) => {
+    const {
+      attachment: { thumbUrl, fileType },
+    } = params;
+    const attachment = {
+      thumb_url: thumbUrl,
+      data_url: thumbUrl,
+      file_type: fileType,
+      status: 'in_progress',
+    };
+    const tempMessage = createTemporaryMessage({
+      attachments: [attachment],
+    });
+    commit('pushMessageToConversation', tempMessage);
+    try {
+      const { data } = await sendAttachmentAPI(params);
+      commit('updateAttachmentMessageStatus', {
+        message: data,
+        tempId: tempMessage.id,
+      });
+    } catch (error) {
+      // Show error
+    }
+  },
+
+  fetchOldConversations: async ({ commit }, { before } = {}) => {
+    try {
+      commit('setConversationListLoading', true);
+      const { data } = await getMessagesAPI({ before });
+      commit('setMessagesInConversation', data);
+      commit('setConversationListLoading', false);
+    } catch (error) {
+      commit('setConversationListLoading', false);
+    }
+  },
+
+  clearConversations: ({ commit }) => {
+    commit('clearConversations');
+  },
+
+  addMessage: async ({ commit }, data) => {
+    commit('pushMessageToConversation', data);
+    onNewMessageCreated(data);
+  },
+
+  updateMessage({ commit }, data) {
+    commit('pushMessageToConversation', data);
+  },
+
+  toggleAgentTyping({ commit }, data) {
+    commit('toggleAgentTypingStatus', data);
+  },
+
+  toggleUserTyping: async (_, data) => {
+    try {
+      await toggleTyping(data);
+    } catch (error) {
+      // IgnoreError
+    }
+  },
+
+  setUserLastSeen: async ({ commit, getters: appGetters }) => {
+    if (!appGetters.getConversationSize) {
+      return;
+    }
+
+    const lastSeen = Date.now() / 1000;
+    try {
+      commit('setMetaUserLastSeenAt', lastSeen);
+      await setUserLastSeenAt({ lastSeen });
+    } catch (error) {
+      // IgnoreError
+    }
+  },
+};