Slack: Chat, Post Block

// GraalJS Script (engine type: 3)

//////// START "main()" /////////////////////////////////////////////////////////////////

main();
function main(){ 

//// == Config Retrieving / 工程コンフィグの参照 ==
const strAuthzSetting     = configs.get      ( "AuthzConfU" );   /// REQUIRED
  engine.log( " AutomatedTask Config: Authz Setting: " + strAuthzSetting );
const strSlackChannel     = configs.get      ( "StrConfA1" );    /// REQUIRED
  if( strSlackChannel   === "" ){
    throw new Error( "\n AutomatedTask ConfigError:" +
                     " Config {A1: SlackChannel} is empty \n" );
  }
const strThread           = configs.get      ( "StrConfA2" );    // NotRequired
  if( strThread         !== "" ){
    engine.log( " AutomatedTask ConfigWarning:" +
                " Message is posted in thread " + strThread );
  }
const strToUserId         = configs.get      ( "StrConfA3" );    // NotRequired
  if( strToUserId       !== "" ){
    engine.log( " AutomatedTask ConfigWarning:" +
                " Message is posted with Ephemeral mode " + strToUserId );
  }
const strMessageTitle     = configs.get      ( "StrConfB1" );    /// REQUIRED
  if( strMessageTitle   === "" ){
    throw new Error( "\n AutomatedTask ConfigError:" +
                     " Config {B1: Title} is empty \n" );
  }
const strMessageBody      = configs.get      ( "StrConfC1" );    /// REQUIRED
  if( strMessageBody    === "" ){
    throw new Error( "\n AutomatedTask ConfigError:" +
                     " Config {C1: Message} is empty \n" );
  }
const strTwocolTsv        = configs.get      ( "StrConfC2" );    // NotRequired
const strCategoryImgUrl   = configs.get      ( "StrConfC3" );    // NotRequired
const strPocketMessageTs  = configs.getObject( "SelectConfD1" ); // NotRequired


//// == Data Retrieving / ワークフローデータの参照 ==
// (Nothing. Some workflow data is referenced via Expression Language in Config.)


//// == Calculating / 演算 ==
/// TSV, Check Empty
let strKeyAndValue = "";
if( strTwocolTsv !== "" ){
  let arrRows = strTwocolTsv.split("\n");
  engine.log( " AutomatedTask Config:" +
              " TSV Rows " + arrRows.length );
  for( let i = 0; i < arrRows.length; i++ ){
    let arrCells = arrRows[i].split("\t");
    if( arrCells.length < 2 ){ // load stop with end line or illegal line
      engine.log( " AutomatedTask UnexpectedTsv line: " + i );
      break; 
    }
    for( let j = 0; j < 2; j++ ){
      if( arrCells[j] === "" ){
        strKeyAndValue += "n/a";
      }else{
        strKeyAndValue += arrCells[j];
      }
      strKeyAndValue += "\n";
    }
    if( i === 4 ){ break; } // up to 5
  }
  strKeyAndValue = strKeyAndValue.slice( 0, -1 );
}
/// Post Message
/// Slack API
/// https://api.slack.com/methods/chat.postMessage
/// https://api.slack.com/methods/chat.postEphemeral
/// https://api.slack.com/messaging/sending
/// https://api.slack.com/reference/messaging/payload
/// https://api.slack.com/reference/block-kit/blocks
// request1, prepare
let request1Obj = {};
    request1Obj.channel = strSlackChannel;
    if( strToUserId !== "" ){
      request1Obj.user = strToUserId;
    }
    request1Obj.text = strMessageTitle + "\n" + strMessageBody;
    if( strThread !== "" ){
      request1Obj.thread_ts = strThread;
    }
    request1Obj.blocks = [];
    request1Obj.blocks[0] = {};
    request1Obj.blocks[0].type = "header";
    request1Obj.blocks[0].text = {};
    request1Obj.blocks[0].text.type = "plain_text";
    request1Obj.blocks[0].text.text = strMessageTitle.slice(0,150); // MAX 150
    // https://api.slack.com/reference/block-kit/blocks#header
    request1Obj.blocks[0].text.emoji = true; // No format 'false'
    request1Obj.blocks[1] = {};
    request1Obj.blocks[1].type = "section";
    request1Obj.blocks[1].text = {};
    request1Obj.blocks[1].text.type = "mrkdwn"; // if "plain_text", newline \n not work.
    request1Obj.blocks[1].text.text = strMessageBody.slice(0,3000); // MAX 3000
    // https://api.slack.com/reference/block-kit/blocks#section
    if( strCategoryImgUrl !== "" ){
      request1Obj.blocks[1].accessory = {};
      request1Obj.blocks[1].accessory.type = "image";
      request1Obj.blocks[1].accessory.image_url = strCategoryImgUrl;
      request1Obj.blocks[1].accessory.alt_text  = "CategoryImg";
    }
    if( strKeyAndValue !== "" ){
      let arrKeyAndValue = strKeyAndValue.split("\n");
      request1Obj.blocks[1].fields = [];
      for( let i = 0; i < arrKeyAndValue.length; i++ ){
        request1Obj.blocks[1].fields[i] = {};
        request1Obj.blocks[1].fields[i].type = "mrkdwn"; // No format "plain_text"
        request1Obj.blocks[1].fields[i].text = arrKeyAndValue[i];
      }
    }
let request1Uri = "https://slack.com/api/chat.postMessage";
  if( strToUserId !== "" ){
    request1Uri = "https://slack.com/api/chat.postEphemeral";
  }
let request1    = httpClient.begin(); // HttpRequestWrapper
    request1    = request1.authSetting( strAuthzSetting ); // with "Authorization: Bearer XX"
    // https://questetra.zendesk.com/hc/en-us/articles/360024574471-R2300#HttpRequestWrapper
    request1    = request1.body( JSON.stringify( request1Obj ), "application/json" );
// request1, try
const response1     = request1.post( request1Uri ); // HttpResponseWrapper
engine.log( " AutomatedTask ApiRequest1 Start: " + request1Uri );
const response1Code = response1.getStatusCode() + "";
const response1Body = response1.getResponseAsString() + "";
engine.log( " AutomatedTask ApiResponse Status: " + response1Code );
if( response1Code !== "200"){
  throw new Error( "\n AutomatedTask UnexpectedResponseError: " +
                    response1Code + "\n" + response1Body + "\n" );
}
// response1, parse
/* 
engine.log( response1Body ); // debug
{
  "ok":true,
  "channel":"C029A930R",
  "ts":"1622607940.003700",
  "message":{
    "bot_id":"B02471SR3BJ",
    "type":"message",
      # # #
    "ts":"1622607940.003700",
    "team":"T029A930F",
    "bot_profile":{
      # # #
    },
  }
}

== ephemeral ==
{
  "ok":true,
  "message_ts":"1622179598.000100"
}

== thread ==
{
  "ok":true,
  "channel":"C029A930R",
  "ts":"1622606758.003500",
  "message":{
    "bot_id":"B02471SR3BJ",
    "type":"message",
      # # #
    "ts":"1622606758.003500",
      # # #
    "bot_profile":{
      # # #
    },
    "blocks":[
      # # #
    ],
    "thread_ts":"1622602402.002700",
      # # #
  }
}
*/
const response1Obj = JSON.parse( response1Body );
if( response1Obj.ok !== true ){
  throw new Error( "\n AutomatedTask UnexpectedResponseError: " +
                    response1Code + "\n" + response1Body + "\n" );
}
if( response1Obj.hasOwnProperty('warning') ){
  engine.log( " AutomatedTask ApiResponse Warning: " + response1Obj.warning );
}


//// == Data Updating / ワークフローデータへの代入 ==
if( strPocketMessageTs !== null ){
  engine.setData( strPocketMessageTs, response1Obj.ts );
}

} //////// END "main()" /////////////////////////////////////////////////////////////////


/*
Notes:
- Posts to the business communication tool "Slack".
    - Posted via "Slack App".
    - Can post not only on public channels but also on private channels.
- Automate postings with business data inserted.
    - e.g. Placed before the approval step, automatically notifies "arrival of approval".
    - e.g. Placed after the timer start, announces the "expense application deadline".
    - e.g. Notifies the long URL of Receive-Task.
- Messages are posted in Block format.
    - The message posted by this Addon consists of a title (header) block and a body (section) block.
    - It is also possible to attach key-value (2-col TSV) information to the body block.
        - Up to the 5th row is displayed.
        - Data that is not tab-delimited will be ignored.
        - Ignored after the 3rd column and 6th row.
        - Empty cells show "n/a".
    - You can use mrkdwn notation or colon emoji notation for the string part.
        - https://api.slack.com/reference/surfaces/formatting#basics
        - "*bold*" will produce bold text
        - "~strike~" will produce strikethrough text
        - "_italic_" will produce italicized text
        - https://www.webfx.com/tools/emoji-cheat-sheet/
        - URLs to refer to the process in the workflow
          - "<${var[applicationRoot]}PE/Workitem/list?processInstanceId=#{processInstanceId}|Desktop View>"
          - "<${var[applicationRoot]}SP/PE/ProcessInstance/view?processInstanceId=#{processInstanceId}|Mobile View>"
- The channel is specified by the channel name (eg "#general") or ID (eg "C1234567890").
    - To reduce the risk of trouble, set an ID that is an invariant value.
- You need to create a "Slack app" in advance.
    - For new creation, [Settings and Management] > [Manage Apps] > [Build] > "Create New App"
        - https://api.slack.com/apps/
    - Setting Example
        - (Wizard)
            - App Name: "BPMS Notification"
            - Pick a workspace to develop your app in: (Select Your Org)
        - Basic Information
            - Display Information: (Add Bot-Logo)
        - OAuth & Permissions
            - Bot Token Scopes: Added "chat:write" (and "files:write")
            - Click "Install to Workfpace" to get "Bot User OAuth Token"
    - You need to add "Slack App" to your workspace in advance.
        - Bottom left of workspace, [Add apps]
    - You need to add "Slack app" to each channel in advance.
        - Upper right of each channel, [Details] > [More] > [Add apps]
Notes-ja:
- ビジネス・コミュニケーションツール「Slack」に対して投稿します。
    - "Slackアプリ" を経由して投稿されます。
    - パブリックチャンネルだけでなく、プライベートチャンネル等にも投稿できます。
- 業務データが挿し込まれたメッセージが自動的に投稿されるようになります。
    - たとえば、決裁工程の前に配置し "決裁案件の到達" が自動通知されるように設定します。
    - たとえば、タイマー開始の直後に配置し "経費申請の締切日" が定時アナウンスされるように設定します。
    - たとえば、"待受工程（受信タスク）のLongURL" が Slackにも通知されるように設定します。
- 投稿メッセージはBlock形式にて投稿されます。
    - このAddonによる投稿は、タイトル（header）ブロックと本文ブロック（section）で構成されます。
    - 本文ブロックに、Key-Value 情報（2列TSV）を添付することも可能です。
        - 5行目まで表示されます。
        - タブ区切りでないデータは無視されます。
        - 3列目以降および6行目以降は無視されます。
        - 空のセルには "n/a" が表示されます。
    - 文字列部には mrkdwn 記法や colon emoji 記法を利用できます。
        - https://api.slack.com/reference/surfaces/formatting#basics
        - "*ボールド*" 太文字
        - "~ストライク~" 取り消し線文字列
        - "_イタリック_" 斜体文字列 （日本語フォントの多くは判別できません）
        - https://www.webfx.com/tools/emoji-cheat-sheet/
        - ワークフローに流れるプロセスを参照するためのURL
          - "<${var[applicationRoot]}PE/Workitem/list?processInstanceId=#{processInstanceId}|WFで見る Desktop View>"
          - "<${var[applicationRoot]}SP/PE/ProcessInstance/view?processInstanceId=#{processInstanceId}|WFで見る Mobile View>"
- チャンネルは、チャンネル名（例 "#general"）もしくはID（例 "C1234567890"）で指定します。
    - トラブルリスクを低減するためには、不変値であるIDを設定します。
- あらかじめ "Slackアプリ" を作成しておく必要があります。
    - 新規作成の場合 [設定と管理] ＞ [アプリを管理する] ＞ [ビルド] から "Create New App" を選択します。
        - https://api.slack.com/apps/
    - 設定例
        - (Wizard)
            - App Name: "BPMS Notification"
            - Pick a workspace to develop your app in: (所属組織のワークスペースを選択)
        - Basic Information
            - Display Information: (ボットロゴを追加)
        - OAuth & Permissions
            - Bot Token Scopes: "chat:write" （と "files:write"） を追加
            - Install to Workfpace をクリックし、"Bot User OAuth Token" を取得
    - あらかじめワークスペースに "Slackアプリ" を追加しておく必要があります。
        - ワークスペース左下 [アプリを追加する]
    - あらかじめ各チャンネルに "Slackアプリ" を追加しておく必要があります。
        - 各チャンネル画面の右上 [チャンネル詳細を開く] ＞ [その他] ＞ [アプリを追加する]

APPENDIX-en
- Setting example of "HTTP Authentication"
    - "Token Fixed Value"
        - Name: NotificatonToSlack
        - Token: {Bot User OAuth Token}
- Also possible to post an "Ephemeral Message" that is displayed only to that user.
    - Recipients can see the "Only visible to you".
    - The background color of the post will be gray.
    - Ephemeral Message is not persistent between terminals or sessions.
    - If you do something, the message will disappear.
    - The user must be on the specified channel.
    - SLACK USER is specified by the ID of the message receiving user.
    - UserID (Member ID) can be obtained from the details of "Profile" and URL.
    - Ephemeral Messages cannot be threaded.
- For the thread_ts of the thread post, specify the time stamp (ts) of the parent message.
    - Thread posting to the time stamp (ts) of the child message is not possible.
        - No error will occur on API communication, but it will not be displayed.
- If the title is set to exceed 150 characters, the 151st and subsequent characters will not be sent.
- The category image URL must be public.
- For more information on how to use Slack itself, refer to the Slack documentation.
    - Token Types
        - https://api.slack.com/authentication/token-types
    - Scopes and permissions
        - https://api.slack.com/scopes
        - https://api.slack.com/scopes/chat:write
        - https://api.slack.com/scopes/files:write
    - API Methods
        - https://api.slack.com/methods
        - https://api.slack.com/methods/chat.postMessage
        - https://api.slack.com/methods/chat.postEphemeral
APPENDIX-ja
- "HTTP認証" の設定例
    - "トークン直接指定"
        - 名前: NotificatonToSlack
        - トークン: {Bot User OAuth Token}
- ユーザIDを指定して、当該ユーザにのみ表示される「揮発メッセージ」を投稿することも可能です。
    - 受信者は「あなただけに表示されています」の表示を確認できます。
    - 投稿の背景色がグレーになります。
    - 揮発メッセージ（Ephemeral Message）は、端末間やセッション間等において永続されません。
    - 何らかの操作をすれば、メッセージは表示されなくなります。
    - ユーザは指定されたチャンネルにいなければなりません。
    - SLACK USER はメッセージ受信ユーザのIDで指定します。
    - UserID（メンバーID）は「プロフィール」の詳細やURL等から取得できます。
    - 揮発メッセージは、スレッドを取れません。
- スレッド投稿のts値（thread_ts）には、親メッセージのタイムスタンプ（ts）を指定します。
    - 子メッセージのタイムスタンプ（ts）に対するスレッド投稿はできません。
        - API通信上はエラーにはなりませんが、表示されません。
- タイトルが150文字を超えて設定された場合、151文字目以降は送信されません。
- カテゴリ画像のURLは、パブリックなURLでなければなりません。
- Slack の詳細仕様は、Slack のドキュメントを参照してください。
    - Token Types
        - https://api.slack.com/authentication/token-types
    - Scopes and permissions
        - https://api.slack.com/scopes
    - API Methods
        - https://api.slack.com/methods
        - https://api.slack.com/methods/chat.postMessage
        - https://api.slack.com/methods/chat.postEphemeral
*/