Slack: Files Upload

// (c) 2018, Questetra, Inc. (the MIT License)

//// == OAuth2 Setting example ==
// Authorization Endpoint URL: "https://slack.com/oauth/authorize"
// Token Endpoint URL: "https://slack.com/api/oauth.access"
// Scope: "files:write:user" (or "bot" etc)
// Client ID: ( from https://api.slack.com/apps )
// Consumer Secret: ( from https://api.slack.com/apps )
// -more- https://api.slack.com/methods/files.upload


//////// START "main()" ////////
main();
function main(){ 

//// == Config Retrieving / 工程コンフィグの参照 ==
const dataIdA  = configs.get( "conf_DataIdA" ) + "";
const oauth2   = configs.get( "conf_OAuth2" ) + "";
const channels = configs.get( "conf_Channels" ) + "";
// 'java.lang.String' (String Obj) to javascript primitive 'string'


//// == Data Retrieving / ワークフローデータの参照 ==
const myFiles  = engine.findDataByNumber( dataIdA ); 
// java.util.ArrayList
if (myFiles == null) {
  throw new Error( '\n Files not Attached \n' );
}
const numFiles = myFiles.size() - 0; // javascript 'number'
// myFiles[i]: com.questetra.bpms.core.event.scripttask.QfileView


//// == Calculating / 演算 ==
/// obtain OAuth2 Access Token
const token   = httpClient.getOAuth2Token( oauth2 );

for(let i = 0; i < numFiles; i++){
  /// prepare API Request
  let apiRequest = httpClient.begin(); // HttpRequestWrapper
  // - com.questetra.bpms.core.event.scripttask.HttpClientWrapper
  apiRequest     = apiRequest.multipart( "token", token );
  // not "apiRequest.bearer( token )"
  if(channels !== ""){
    apiRequest     = apiRequest.multipart( "channels", channels );
  }
  apiRequest     = apiRequest.multipart( "file", myFiles[i] );

  /// access API (with post(), get(), put(), etc.)
  const response = apiRequest.post( "https://slack.com/api/files.upload" );
  // - HttpResponseWrapper
  const httpStatus  = response.getStatusCode() + "";
  engine.log( "STATUS: " + httpStatus );
  const responseStr = response.getResponseAsString() + "";
  engine.log( "RESPONSE: \n" + responseStr );
}


//// == Data Updating / ワークフローデータへの代入 ==
// (nothing)

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