@yext/chat-headless/dist/esm/src/ChatHeadlessImpl.mjs.map

A state manager library powered by Redux for Yext Chat integrations

{"version":3,"file":"ChatHeadlessImpl.mjs","sources":["../../../src/ChatHeadlessImpl.ts"],"sourcesContent":["import {\n  provideChatCore,\n  Message,\n  MessageNotes,\n  MessageResponse,\n  MessageSource,\n  StreamEventName,\n  ApiError,\n  IntegrationDetails,\n} from \"@yext/chat-core\";\nimport {\n  ChatClient,\n  ChatHeadless,\n  HeadlessConfig,\n  State,\n  StateListener,\n} from \"./models\";\nimport { ReduxStateManager } from \"./ReduxStateManager\";\nimport {\n  loadSessionState,\n  saveSessionState,\n  setCanSendMessage,\n  setConversationId,\n  setIsLoading,\n  setMessageNotes,\n  setMessages,\n  addMessage,\n} from \"./slices/conversation\";\nimport { Store, Unsubscribe } from \"@reduxjs/toolkit\";\nimport { setContext } from \"./slices/meta\";\nimport {\n  analytics,\n  AnalyticsEventService,\n  EventPayload,\n} from \"@yext/analytics\";\nimport { getClientSdk } from \"./utils/clientSdk\";\nimport {\n  ChatEventClient,\n  isChatEventClient,\n} from \"./models/clients/ChatEventClient\";\nimport { RecursivePartial } from \"./models/ChatHeadless\";\n\nconst BASE_HANDOFF_CREDENTIALS_SESSION_STORAGE_KEY =\n  \"yext_chat_handoff_credentials\";\n\n/**\n * Concrete implementation of {@link ChatHeadless}\n *\n * @internal\n */\nexport class ChatHeadlessImpl implements ChatHeadless {\n  private config: HeadlessConfig;\n  private chatClient: ChatClient;\n  private botClient: ChatClient;\n  private clients: ChatClient[];\n  private stateManager: ReduxStateManager;\n  private analyticsService: AnalyticsEventService;\n  private credentialsSessionStorageKey: string | undefined;\n\n  private isImpressionAnalyticEventSent = false;\n\n  /**\n   * Constructs a new instance of the {@link ChatHeadlessImpl} class.\n   *\n   * @internal\n   *\n   * @param config - The configuration for the {@link ChatHeadlessImpl} instance\n   * @param chatClient - An optional override for the default {@link ChatClient} instance\n   */\n  constructor(\n    config: HeadlessConfig,\n    botClient?: ChatClient,\n    agentClient?: ChatClient\n  ) {\n    const defaultConfig: Partial<HeadlessConfig> = {\n      saveToLocalStorage: true,\n    };\n    this.config = { ...defaultConfig, ...config };\n\n    // bot client is the default client.\n    // If agent client is provided, it will be used as the second client on handoff\n    this.chatClient = botClient ?? provideChatCore(this.config);\n    this.botClient = this.chatClient;\n    this.clients = [this.chatClient];\n    if (agentClient) {\n      this.clients.push(agentClient);\n    }\n    this.setClientEventListeners();\n\n    this.stateManager = new ReduxStateManager();\n    this.analyticsService = analytics({\n      authorizationType: 'apiKey',\n      authorization: this.config.apiKey,\n      env: this.config.env,\n      region: this.config.region,\n      ...this.config.analyticsConfig,\n    });\n    if (this.config.saveToLocalStorage) {\n      this.initLocalStorage();\n    }\n  }\n\n  private get sessionAgentCredentials(): unknown | void {\n    if (this.credentialsSessionStorageKey) {\n      const credentials = sessionStorage.getItem(\n        this.credentialsSessionStorageKey\n      );\n      if (credentials) {\n        try {\n          return JSON.parse(credentials);\n        } catch (e) {\n          this.removeSessionAgentCredentials();\n          throw new Error(\n            `Error occurred while parsing credentials from session storage: ${e}`\n          );\n        }\n      }\n    }\n  }\n\n  private setSessionAgentCredentials(credentials: unknown) {\n    if (this.credentialsSessionStorageKey) {\n      sessionStorage.setItem(\n        this.credentialsSessionStorageKey,\n        JSON.stringify(credentials)\n      );\n    }\n  }\n\n  private removeSessionAgentCredentials() {\n    if (this.credentialsSessionStorageKey) {\n      sessionStorage.removeItem(this.credentialsSessionStorageKey);\n    }\n  }\n\n  get state(): State {\n    return this.stateManager.getState();\n  }\n\n  setState(state: State): void {\n    this.stateManager.dispatch({\n      type: \"set-state\",\n      payload: state,\n    });\n  }\n\n  get store(): Store {\n    return this.stateManager.getStore();\n  }\n\n  /**\n   * Sets up event listeners to update state for event-driven clients.\n   */\n  private setClientEventListeners() {\n    this.clients.forEach((client) => {\n      if (!client || !isChatEventClient(client)) {\n        return;\n      }\n\n      client.on(\"message\", (data: string) => {\n        this.addMessage({\n          source:\n            client === this.botClient ? MessageSource.BOT : MessageSource.AGENT,\n          text: data,\n          timestamp: new Date().toISOString(),\n        });\n      });\n\n      client.on(\"typing\", (data: boolean) => {\n        this.setChatLoadingStatus(data);\n      });\n\n      client.on(\"close\", async (_data: unknown) => {\n        this.handoff();\n      });\n    });\n  }\n\n  /**\n   * Switches the current chat client with the next client, if available.\n   */\n  private async handoff(integrationDetails?: IntegrationDetails) {\n    if (isChatEventClient(this.chatClient)) {\n      this.removeSessionAgentCredentials();\n    }\n\n    let nextClient: ChatClient | undefined = undefined;\n    for (const client of this.clients) {\n      if (this.chatClient !== client) {\n        nextClient = client;\n      }\n    }\n    if (!nextClient) {\n      console.warn(\"No next client available for handoff.\");\n      return;\n    }\n\n    if (isChatEventClient(nextClient)) {\n      try {\n        if (this.sessionAgentCredentials) {\n          await this.reinitializeAgentSession(nextClient);\n        } else {\n          const creds = await nextClient.init({\n            conversationId: this.state.conversation.conversationId,\n            message: this.state.conversation.messages.at(-1) || {\n              source: MessageSource.BOT,\n              text: \"\",\n            },\n            notes: this.state.conversation.notes || {},\n            integrationDetails,\n          });\n\n          this.setSessionAgentCredentials(creds);\n        }\n      } catch (e) {\n        console.error(\"Error occurred while initializing next client:\", e);\n        return;\n      }\n    }\n    this.chatClient = nextClient;\n  }\n\n  private async reinitializeAgentSession(client: ChatEventClient) {\n    this.setCanSendMessage(false);\n    await client.reinitializeSession(this.sessionAgentCredentials);\n    this.setCanSendMessage(true);\n  }\n\n  addClientSdk(additionalClientSdk: Record<string, string>) {\n    const { analyticsConfig } = this.config;\n    this.config.analyticsConfig = {\n      ...analyticsConfig,\n      baseEventPayload: {\n        ...analyticsConfig?.baseEventPayload,\n        clientSdk: {\n          ...analyticsConfig?.baseEventPayload?.clientSdk,\n          ...additionalClientSdk,\n        },\n      },\n    };\n  }\n\n  initLocalStorage() {\n    const hostname = window.location.hostname;\n    if (!hostname) {\n      console.warn(\n        \"Unable to get hostname of current page. State will not be persisted while navigating across pages.\"\n      );\n      return;\n    }\n\n    if (!localStorage) {\n      console.warn(\n        \"Local storage is not available. State will not be persisted while navigating across pages.\"\n      );\n      return;\n    }\n\n    this.setState({\n      ...this.state,\n      conversation: loadSessionState(this.config.botId),\n    });\n    this.addListener({\n      valueAccessor: (s) => s.conversation,\n      callback: () =>\n        saveSessionState(this.config.botId, this.state.conversation),\n    });\n\n    if (!sessionStorage) {\n      console.warn(\n        \"Session storage is not available. State will not be persisted while navigating across pages.\"\n      );\n      return;\n    }\n\n    this.credentialsSessionStorageKey = `${BASE_HANDOFF_CREDENTIALS_SESSION_STORAGE_KEY}__${hostname}__${this.config.botId}`;\n\n    try {\n      const credentials = this.sessionAgentCredentials;\n      if (credentials) {\n        this.handoff();\n      }\n    } catch (e) {\n      console.error(\n        \"Error occurred while initializing agent session using stored credentials:\",\n        e\n      );\n    }\n  }\n\n  async report(\n    eventPayload: Omit<EventPayload, \"chat\"> &\n        RecursivePartial<Pick<EventPayload, \"chat\">>\n  ) {\n    if (eventPayload.action === \"CHAT_IMPRESSION\") {\n      if (this.isImpressionAnalyticEventSent) {\n        return;\n      }\n      this.isImpressionAnalyticEventSent = true;\n    }\n    const chatProps: EventPayload[\"chat\"] = {\n      botId: this.config.botId,\n      conversationId: this.state.conversation.conversationId,\n    };\n    const baseEventPayload = this.config.analyticsConfig?.baseEventPayload;\n    try {\n      await this.analyticsService.report({\n        timestamp: new Date().toISOString(),\n        pageUrl: window?.location.href || undefined,\n        referrerUrl: window?.document.referrer || undefined,\n        ...baseEventPayload,\n        ...eventPayload,\n        clientSdk: getClientSdk({\n          ...baseEventPayload?.clientSdk,\n          ...eventPayload.clientSdk,\n        }),\n        chat: {\n          ...chatProps,\n          ...baseEventPayload?.chat,\n          ...eventPayload.chat,\n        },\n      });\n    } catch (e) {\n      console.error(\"Error occured on request to Analytics API:\", e);\n    }\n  }\n\n  setContext(context: unknown) {\n    this.stateManager.dispatch(setContext(context));\n  }\n\n  setMessages(messages: Message[]) {\n    this.stateManager.dispatch(setMessages(messages));\n  }\n\n  addMessage(message: Message) {\n    this.stateManager.dispatch(addMessage(message));\n  }\n\n  setMessageNotes(notes: MessageNotes) {\n    this.stateManager.dispatch(setMessageNotes(notes));\n  }\n\n  setChatLoadingStatus(isLoading: boolean) {\n    this.stateManager.dispatch(setIsLoading(isLoading));\n  }\n\n  setCanSendMessage(canSendMessage: boolean) {\n    this.stateManager.dispatch(setCanSendMessage(canSendMessage));\n  }\n\n  /**\n   * Sets {@link ConversationState.conversationId} to the specified id\n   *\n   * @internal\n   *\n   * @param id - the id to set\n   */\n  private setConversationId(id: string | undefined) {\n    this.stateManager.dispatch(setConversationId(id));\n  }\n\n  restartConversation() {\n    if (isChatEventClient(this.chatClient)) {\n      this.removeSessionAgentCredentials();\n      this.chatClient.resetSession();\n    }\n    this.chatClient = this.botClient;\n\n    this.setConversationId(undefined);\n    this.setChatLoadingStatus(false);\n    this.setCanSendMessage(true);\n    this.setMessageNotes({});\n    this.setMessages([]);\n  }\n\n  addListener<T>(listener: StateListener<T>): Unsubscribe {\n    return this.stateManager.addListener<T>(listener);\n  }\n\n  async getNextMessage(\n    text?: string,\n    source: MessageSource = MessageSource.USER\n  ): Promise<MessageResponse | undefined> {\n    const client = this.chatClient;\n    if (isChatEventClient(client)) {\n      const { conversationId, notes } = this.state.conversation;\n      if (text && text.length > 0) {\n        this.addMessage({\n          timestamp: new Date().toISOString(),\n          source,\n          text,\n        });\n      }\n      client.processMessage({\n        conversationId,\n        notes,\n        messages: this.state.conversation.messages,\n        context: this.state.meta.context,\n      });\n      return;\n    }\n    return this.nextMessageHandler(\n      async () => {\n        const { messages, conversationId, notes } = this.state.conversation;\n        const nextMessage = await client.getNextMessage({\n          conversationId,\n          messages,\n          notes,\n          context: this.state.meta.context,\n        });\n        this.setConversationId(nextMessage.conversationId);\n        this.addMessage(nextMessage.message);\n        this.setMessageNotes(nextMessage.notes);\n        return nextMessage;\n      },\n      text,\n      source\n    );\n  }\n\n  async streamNextMessage(\n    text?: string,\n    source: MessageSource = MessageSource.USER\n  ): Promise<MessageResponse | undefined> {\n    const client = this.chatClient;\n    if (isChatEventClient(client)) {\n      throw new Error(\"streamNextMessage is not supported by this client.\");\n    }\n    return this.nextMessageHandler(\n      async () => {\n        let messageResponse: MessageResponse | undefined = undefined;\n        let nextMessage: Message = {\n          source: MessageSource.BOT,\n          text: \"\",\n        };\n        const { messages, conversationId, notes } = this.state.conversation;\n        const stream = await client.streamNextMessage({\n          conversationId,\n          messages,\n          notes,\n          context: this.state.meta.context,\n        });\n        stream.addEventListener(StreamEventName.StartEvent, ({ data }) => {\n          this.setChatLoadingStatus(false);\n          this.setMessageNotes(data);\n        });\n        stream.addEventListener(\n          StreamEventName.TokenStreamEvent,\n          ({ data }) => {\n            nextMessage = {\n              ...nextMessage,\n              text: nextMessage.text + data.token,\n            };\n            this.setMessages([...messages, nextMessage]);\n          }\n        );\n        stream.addEventListener(StreamEventName.EndEvent, ({ data }) => {\n          this.setConversationId(data.conversationId);\n          this.setMessages([...messages, data.message]);\n          messageResponse = data;\n        });\n        await stream.consume();\n        if (!messageResponse) {\n          return Promise.reject(\n            new ApiError(\n              \"Stream Error: Missing full message response at the end of stream.\"\n            )\n          );\n        }\n        return messageResponse;\n      },\n      text,\n      source\n    );\n  }\n\n  /**\n   * Setup relevant state before hitting Chat API endpoint for next message, such as\n   * setting loading status, \"canSendMessage\" status, and appending new user's message\n   * in conversation state.\n   *\n   * @remarks\n   * If the response contains integration details, it will trigger a handoff to the next client.\n   *\n   * @internal\n   *\n   * @param nextMessageFn - function to invoke to get next message\n   * @param text - the text of the next message\n   * @param source - the source of the message\n   * @returns a Promise of a response from the Chat API\n   */\n  private async nextMessageHandler(\n    nextMessageFn: () => Promise<MessageResponse>,\n    text?: string,\n    source: MessageSource = MessageSource.USER\n  ): Promise<MessageResponse | undefined> {\n    if (!this.state.conversation.canSendMessage) {\n      console.warn(\n        \"Unable to process new message at the moment. Another message is still being processed.\"\n      );\n      return;\n    }\n    this.setCanSendMessage(false);\n    this.setChatLoadingStatus(true);\n    let messages: Message[] = this.state.conversation.messages;\n    if (text && text.length > 0) {\n      messages = [\n        ...messages,\n        {\n          timestamp: new Date().toISOString(),\n          source,\n          text,\n        },\n      ];\n      this.setMessages(messages);\n    }\n    let messageResponse;\n    try {\n      messageResponse = await nextMessageFn();\n    } catch (e) {\n      this.setCanSendMessage(true);\n      this.setChatLoadingStatus(false);\n      return Promise.reject(e);\n    }\n    await this.report({\n      action: \"CHAT_RESPONSE\",\n      timestamp: messageResponse.message.timestamp,\n      chat: {\n        conversationId: messageResponse.conversationId,\n        responseId: messageResponse.message.responseId,\n      },\n    });\n    this.setCanSendMessage(true);\n    this.setChatLoadingStatus(false);\n    if (!!messageResponse.integrationDetails) {\n      await this.handoff(messageResponse.integrationDetails);\n    }\n    return messageResponse;\n  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