bottender-compose

bottender-compose

An utility library for Bottender and higher-order handlers

Installation

npm install bottender-compose

API Reference

TOC

• Actions
  • series()
  • parallel()
  • random()
  • branch()
  • condition()
  • match()
  • platform()
  • tryCatch()
  • weight()
  • doNothing()
  • repeat()
  • delay()
  • setDisplayName()
  • effect()
  • attachOptions()
  • Logger Methods
  • Context Methods
• Predicates
  • isTextMatch()
  • isPayloadMatch()
  • hasStateEqual()
  • not()
  • and()
  • or()
  • alwaysTrue()
  • alwaysFalse()
  • Event Predicates

Actions

series()

Creates a function that executes methods in series.

const { series, sendText } = require('bottender-compose');

bot.onEvent(
  series([
    sendText('1. First Item'),
    sendText('2. Second Item'),
    sendText('3. Third Item'),
  ])
);

parallel()

Creates a function that executes methods in parallel.

const { parallel, sendText } = require('bottender-compose');

bot.onEvent(
  parallel([
    sendText('- You got one of Items'),
    sendText('- You got one of Items'),
    sendText('- You got one of Items'),
  ])
);

random()

Creates a function that executes one of method randomly.

const { random, sendText } = require('bottender-compose');

bot.onEvent(
  random([
    sendText('You got a random item: A'),
    sendText('You got a random item: B'),
    sendText('You got a random item: C'),
  ])
);

branch()

Creates a function that will process either the onTrue or the onFalse function depending upon the result of the condition predicate.
Furthermore, branch can be sued as curry function.

const { branch, sendText } = require('bottender-compose');

bot.onEvent(
  branch(
    context => true,
    sendText('You are the lucky one.'),
    sendText('Too bad.')
  )
);

// curry function
const trueConditionBranch = branch(context => true);

bot.onEvent(
  trueConditionBranch(sendText('You are the lucky one.'), sendText('Too bad.'))
);

Or you can executes function on true and do nothing when received false.

branch(context => true, sendText('You are the lucky one.'));

branch works well with predicates.

condition()

Creates a function that encapsulates if/else, if/else, ... logic.

const { condition, sendText } = require('bottender-compose');

bot.onEvent(
  condition([
    [context => false, sendText('a')],
    [context => false, sendText('b')],
    [context => true, sendText('c')],
  ])
);

condition works well with predicates.

match()

Creates a function that encapsulates value matching logic.

const { match, sendText } = require('bottender-compose');

bot.onEvent(
  match('a', [
    ['a', sendText('You got a A')],
    ['b', sendText('You got a B')],
    ['c', sendText('You got a C')],
  ])
);

It accepts function with context argument:

bot.onEvent(
  match(context => context.state.answer, [
    ['a', sendText('You got a A')],
    ['b', sendText('You got a B')],
    ['c', sendText('You got a C')],
  ])
);

// curry function
const matchAnswer = match(context => context.state.answer);

bot.onEvent(
  matchAnswer([
    ['a', sendText('You got a A')],
    ['b', sendText('You got a B')],
    ['c', sendText('You got a C')],
  ])
);

To assign default action, use _ as pattern:

const { _, match, sendText } = require('bottender-compose');

bot.onEvent(
  match('a', [
    ['a', sendText('You got a A')],
    ['b', sendText('You got a B')],
    ['c', sendText('You got a C')],
    [_, sendText('You got something')],
  ])
);

platform()

Creates a function that will process function depending upon the platform context.

const {
  platform,
  sendGenericTemplate,
  sendImagemap,
} = require('bottender-compose');

bot.onEvent(platform({
  messenger: sendGenericTemplate(...),
  line: sendImagemap(...),
}));

Or you can use others key to match other platforms:

platform({
  messenger: sendGenericTemplate(...),
  line: sendImagemap(...),
  others: sendText('Unsupported.'),
});

tryCatch()

Creates a function that calls error handler on error.
Furthermore, tryCatch can be used as curry function.

const { tryCatch, sendText } = require('bottender-compose');

bot.onEvent(
  tryCatch(doSomethingMayFail(), sendText('Error Happened~~~~~~~~~~~!'))
);

// curry function
const mayFailTryCatch = tryCatch(doSomethingMayFail());

bot.onEvent(mayFailTryCatch(sendText('Error Happened~~~~~~~~~~~!')));

weight()

Creates a function that randomly executes one of method by its weight.

const { weight, sendText } = require('bottender-compose');

bot.onEvent(
  weight([
    [0.2, sendText('20%')],
    [0.4, sendText('40%')],
    [0.4, sendText('40%')],
  ])
);

doNothing()

Creates a no-op function.

const { branch, sendText, doNothing } = require('bottender-compose');

bot.onEvent(
  branch(
    context => false,
    sendText('You are the lucky one.'),
    doNothing() // do exactly nothing...
  )
);

repeat()

Creates a function that executes the method repeatedly.
Furthermore, repeat can be sued as curry function.

const { repeat, sendText } = require('bottender-compose');

bot.onEvent(repeat(3, sendText('This will be sent 3 times.')));

// curry function
const repeatFiveTimes = repeat(5);

bot.onEvent(repeatFiveTimes(sendText('This will be sent 5 times.')));

delay()

Creates a function that executes methods after a number of milliseconds.

const { series, delay, sendText } = require('bottender-compose');

bot.onEvent(
  series([
    sendText('1. First Item'),
    delay(1000),
    sendText('2. Second Item'),
    delay(1000),
    sendText('3. Third Item'),
  ])
);

setDisplayName()

Assigns to the displayName property on the action.

const { setDisplayName, sendText } = require('bottender-compose');

setDisplayName('sayHello', sendText('hello'));

// curry function
setDisplayName('sayHello')(sendText('hello'));

effect()

Does side effects and mutate state or props.

const { effect } = require('bottender-compose');

bot.onEvent(
  effect(
    // function has side effects
    async context => {
      await doSomeSideEffects();
      return {
        derivedState: {
          x: 1,
        },
        derivedProps: {
          y: 2,
        },
      };
    },

    // action
    async (context, props) => {
      console.log(context.state.x); // 1
      console.log(props.y); // 2
    }
  )
);

attachOptions()

Attaches additional options to the action.

const { attachOptions, sendText } = require('bottender-compose');

bot.onEvent(
  attachOptions({ tag: 'ISSUE_RESOLUTION' }, sendText('Issue Resolved'))
);

// curry function
const attachIssueResolutionTag = attachOptions({ tag: 'ISSUE_RESOLUTION' });

bot.onEvent(attachIssueResolutionTag(sendText('Issue Resolved')));

Logger Methods

B.series([
  B.log('sending hello'),
  B.info('sending hello'),
  B.warn('sending hello'),
  B.error('sending hello'),

  B.sendText('hello'),
]);

It supports template too.

B.series([
  B.log('user: {{ session.user.id }} x: {{ state.x }}'),
  B.sendText('hello'),
]);

You can use your owner adapter for the logger:

const { log, info, warn, error } = B.createLogger({
  log: debug('log'),
  info: debug('info'),
  warn: debug('warn'),
  error: debug('error'),
});

B.series([log('sending hello'), B.sendText('hello')]);

Context Methods

Common

• setState()
• resetState()
• typing()

Messenger

• sendMessage()
• sendText()
• sendAttachment()
• sendAudio()
• sendImage()
• sendVideo()
• sendFile()
• sendTemplate()
• sendButtonTemplate()
• sendGenericTemplate()
• sendListTemplate()
• sendOpenGraphTemplate()
• sendMediaTemplate()
• sendReceiptTemplate()
• sendAirlineBoardingPassTemplate()
• sendAirlineCheckinTemplate()
• sendAirlineItineraryTemplate()
• sendAirlineFlightUpdateTemplate()
• sendSenderAction()
• markSeen()
• typingOn()
• typingOff()
• passThreadControl()
• passThreadControlToPageInbox()
• takeThreadControl()
• requestThreadControl()
• associateLabel()
• dissociateLabel()

LINE

• sendText()
• sendImage()
• sendVideo()
• sendAudio()
• sendLocation()
• sendSticker()
• sendImagemap()
• sendButtonTemplate()
• sendConfirmTemplate()
• sendCarouselTemplate()
• sendImageCarouselTemplate()
• reply()
• replyText()
• replyImage()
• replyVideo()
• replyAudio()
• replyLocation()
• replySticker()
• replyImagemap()
• replyButtonTemplate()
• replyConfirmTemplate()
• replyCarouselTemplate()
• replyImageCarouselTemplate()
• push()
• pushText()
• pushImage()
• pushVideo()
• pushAudio()
• pushLocation()
• pushSticker()
• pushImagemap()
• pushButtonTemplate()
• pushConfirmTemplate()
• pushCarouselTemplate()
• pushImageCarouselTemplate()
• linkRichMenu()
• unlinkRichMenu()

Slack

• sendText()
• postMessage()
• postEphemeral()

Telegram

• sendText()
• sendMessage()
• sendPhoto()
• sendAudio()
• sendDocument()
• sendSticker()
• sendVideo()
• sendVoice()
• sendVideoNote()
• sendMediaGroup()
• sendLocation()
• sendVenue()
• sendContact()
• sendChatAction()
• editMessageText()
• editMessageCaption()
• editMessageReplyMarkup()
• deleteMessage()
• editMessageLiveLocation()
• stopMessageLiveLocation()
• forwardMessageFrom()
• forwardMessageTo()
• kickChatMember()
• unbanChatMember()
• restrictChatMember()
• promoteChatMember()
• exportChatInviteLink()
• setChatPhoto()
• deleteChatPhoto()
• setChatTitle()
• setChatDescription()
• setChatStickerSet()
• deleteChatStickerSet()
• pinChatMessage()
• unpinChatMessage()
• leaveChat()
• sendInvoice()
• answerShippingQuery()
• answerPreCheckoutQuery()
• answerInlineQuery()
• sendGame()
• setGameScore()

Viber

• sendMessage()
• sendText()
• sendPicture()
• sendVideo()
• sendFile()
• sendContact()
• sendLocation()
• sendURL()
• sendSticker()
• sendCarouselContent()

Facebook

• sendComment()
• sendPrivateReply()
• sendLike()

Passing Function as Argument to Context Method

You can pass function as argument to handle time-specified or context-specified case, for example:

// Lazy execution
B.sendText(() => `Now: ${new Date()}`);

// Use user information on context
B.sendText(
  context =>
    `${context.session.user.first_name} ${
      context.session.user.last_name
    }, You are the lucky one.`
);

// Use event information
B.sendText(context => `Received: ${context.event.text}`);

Use Template in String

You can use context, session, event, state, user to access values in your template string:

B.sendText('Hi, {{session.user.first_name}} {{session.user.last_name}}');
B.sendText('Received: {{event.text}}');
B.sendText('State: {{state.xxx}}');
B.sendText('User: {{user.first_name}} {{user.last_name}}');

Or use props to access object values that provided as props when calling action:

B.sendText('User: {{props.name}}')(context, { name: 'Super User' });

Predicates

isTextMatch()

Creates a predicate function to return true when text matches.

const { isTextMatch } = require('bottender-compose');

isTextMatch('abc')(context); // boolean
isTextMatch(/abc/)(context); // boolean

isPayloadMatch()

Creates a predicate function to return true when payload matches.

const { isPayloadMatch } = require('bottender-compose');

isPayloadMatch('abc')(context); // boolean
isPayloadMatch(/abc/)(context); // boolean

hasStateEqual()

Creates a predicate function to return true when state matches.

const { hasStateEqual } = require('bottender-compose');

hasStateEqual('x', 1)(context); // boolean
hasStateEqual('x.y.z', 1)(context); // boolean
hasStateEqual('x', { y: { z: 1 } })(context); // boolean

not()

Creates a predicate function with not condition.

const { not, hasStateEqual } = require('bottender-compose');

const predicate = not(hasStateEqual('x', 1));

predicate(context); // boolean

and()

Creates a predicate function with and condition.

const { and, hasStateEqual } = require('bottender-compose');

const predicate = and([
  isTextMatch('abc'),
  hasStateEqual('x', 1))
]);

predicate(context) // boolean

or()

Creates a predicate function with or condition.

const { or, hasStateEqual } = require('bottender-compose');

const predicate = or([
  isTextMatch('abc'),
  hasStateEqual('x', 1))
]);

predicate(context) // boolean

alwaysTrue

Creates a predicate function that always return true.

const { alwaysTrue } = require('bottender-compose');

const predicate = alwaysTrue();

predicate(context); // true

alwaysFalse

Creates a predicate function that always return false.

const { alwaysFalse } = require('bottender-compose');

const predicate = alwaysFalse();

predicate(context); // false

Event Predicates

Messenger

• isMessage()
• isText()
• hasAttachment()
• isImage()
• isAudio()
• isVideo()
• isLocation()
• isFile()
• isFallback()
• isSticker()
• isLikeSticker()
• isQuickReply()
• isEcho()
• isPostback()
• isGamePlay()
• isOptin()
• isPayment()
• isCheckoutUpdate()
• isPreCheckout()
• isRead()
• isDelivery()
• isPayload()
• isPolicyEnforcement()
• isAppRoles()
• isStandby()
• isPassThreadControl()
• isTakeThreadControl()
• isRequestThreadControl()
• isRequestThreadControlFromPageInbox()
• isFromCustomerChatPlugin()
• isReferral()
• isBrandedCamera()

LINE

• isMessage()
• isText()
• isImage()
• isVideo()
• isAudio()
• isLocation()
• isSticker()
• isFollow()
• isUnfollow()
• isJoin()
• isLeave()
• isPostback()
• isPayload()
• isBeacon()
• isAccountLink()

Slack

• isMessage()
• isChannelsMessage()
• isGroupsMessage()
• isImMessage()
• isMpimMessage()
• isText()
• isInteractiveMessage()
• isAppUninstalled()
• isChannelArchive()
• isChannelCreated()
• isChannelDeleted()
• isChannelHistoryChanged()
• isChannelRename()
• isChannelUnarchive()
• isDndUpdated()
• isDndUpdated_user()
• isEmailDomainChanged()
• isEmojiChanged()
• isFileChange()
• isFileCommentAdded()
• isFileCommentDeleted()
• isFileCommentEdited()
• isFileCreated()
• isFileDeleted()
• isFilePublic()
• isFileShared()
• isFileUnshared()
• isGridMigrationFinished()
• isGridMigrationStarted()
• isGroupArchive()
• isGroupClose()
• isGroupHistoryChanged()
• isGroupOpen()
• isGroupRename()
• isGroupUnarchive()
• isImClose()
• isImCreated()
• isImHistoryChanged()
• isImOpen()
• isLinkShared()
• isMemberJoinedChannel()
• isMemberLeftChannel()
• isPinAdded()
• isPinRemoved()
• isReactionAdded()
• isReactionRemoved()
• isStarAdded()
• isStarRemoved()
• isSubteamCreated()
• isSubteamMembersChanged()
• isSubteamSelfAdded()
• isSubteamSelfRemoved()
• isSubteamUpdated()
• isTeamDomainChange()
• isTeamJoin()
• isTeamRename()
• isTokensRevoked()
• isUrlVerification()
• isUserChange()

Telegram

• isMessage()
• isText()
• isAudio()
• isDocument()
• isGame()
• isPhoto()
• isSticker()
• isVideo()
• isVoice()
• isVideoNote()
• isContact()
• isLocation()
• isVenue()
• isEditedMessage()
• isChannelPost()
• isEditedChannelPost()
• isInlineQuery()
• isChosenInlineResult()
• isCallbackQuery()
• isPayload()
• isShippingQuery()
• isPreCheckoutQuery()

Viber

• isMessage()
• isText()
• isPicture()
• isVideo()
• isFile()
• isSticker()
• isContact()
• isURL()
• isLocation()
• isSubscribed()
• isUnsubscribed()
• isConversationStarted()
• isDelivered()
• isSeen()
• isFailed()

Facebook

• isFeed()
• isStatus()
• isStatusAdd()
• isStatusEdited()
• isPost()
• isPostRemove()
• isComment()
• isCommentAdd()
• isCommentEdited()
• isCommentRemove()
• isLike()
• isLikeAdd()
• isLikeRemove()
• isReaction()
• isReactionAdd()
• isReactionEdit()
• isReactionRemove()

License

MIT © Yoctol