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GoogleAppScriptでDriveに保存されている画像をSlackに送信

GASを使って SlackのBotを開発しているときに、ふとインターネットに公開されていない 画像付の投稿をしたくなるときがあるのでメモ

Bot版

前提
token発行済

要件
GoogleDriveに保存されている画像を投稿する(インターネットに公開されていなくてOK)

file.uploadを使う
https://api.slack.com/methods/files.upload

var file = DriveApp.getFileById('GoogleDriveのファイルID');
var options = {
    "payload": {
      token: "slack access token.",
      as_user: true,
      file: file.getBlob(),
      filename: file.getName(),
      channels: channel,
  }
}
var result = UrlFetchApp.fetch("https://slack.com/api/files.upload", options);
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