【GAS】YouTube自動アップロード②　APIを使用した公開予約とサムネイル設定方法

function uploadVideo() {
  //アクセストークンを取得するための関数を実行
  var access_token = getAccessToken(); 
  
  //公開予約時間の整備
  var today = new Date();
  var hour = today.getHours();
  today.setHours(hour + 3);
  var iso8601 = Utilities.formatDate(today, 'UTC', "yyyy-MM-dd'T'HH:mm:ss.S'Z'");

  //アップロード情報を整備
  var title = 'タイトル'
  var description = '説明分';
  var tags = 'タグ'
  var categoryId = 'カテゴリーID' //カンマ区切り
  var fileToUpload = '動画ファイル名'
  var thumbnailName = 'サムネイル画像ファイル名' 

  //ファイル情報を整備
  var file = DriveApp.getFilesByName(fileToUpload).next();
  var fileSize = file.getSize();
  var fileSizeString = fileSize.toString();
  var fileBlob = file.getBlob();

  //アップロード情報リクエストの送信
  var payload = {
    "snippet": {
      "title": title,
      "description": description,
      "tags": [tags],
      "categoryId": categoryId
    },
    "status": {
      "publishAt": iso8601, //公開予約時間
      "privacyStatus": "private",
      "embeddable": true,
      "license": "youtube",
      'selfDeclaredMadeForKids': false //子供向けではない
    }
  };
  
  var payloadString = JSON.stringify(payload);

  var headers = {
    "Authorization": "Bearer " + access_token,
    "Content-Type": "application/json; charset=utf-8",
    "X-Upload-Content-Length": fileSizeString,
    "X-Upload-Content-Type": "application/octet-stream"
  };
  
  var options = {
    method: "post",
    contentType: "application/json",
    headers: headers,
    payload: payloadString,
    muteHttpExceptions: true
  };
  
  var url = "https://www.googleapis.com/upload/youtube/v3/videos?uploadType=resumable&part=snippet,status,contentDetails";
  var response = UrlFetchApp.fetch(url, options);
  
  //レスポンスから動画アップロード用URLを取得
  var headers = response.getHeaders();
  var uploadUrl = headers['Location'];

  //動画サイズが50MB未満かどうかで処理を分岐
  var chunkSize =49 * 1024 * 1024;

  //50MB未満の場合
  if (fileSize <= chunkSize) {
    
    //動画アップロードリクエストを送信
    var headers = {
      "Authorization": "Bearer " + access_token,
      "Content-Type": "application/octet-stream"
    };
  
    var options = {
      method: "put",
      contentType: "application/octet-stream",
      headers: headers,
      payload: fileBlob
    };
    
    try {
      var response = UrlFetchApp.fetch(uploadUrl, options);
      Logger.log("Response: " + response.getContentText());
    } catch (e) {
      Logger.log("Failure");
      throw e;
    }
    
  //50MB以上の場合
  }else{

    //動画をチャンクに分けるための関数を実行
    var chunksBlobs = readInChunks(file);
    
    //リクエスト送信用にチャンクごとのサイズ数を整備
    var chunkNum  = Math.floor(fileSize / chunkSize);
    var lastChunk =  fileSize % chunkSize;
    var chunks = [];

    for(var i = 0; i < chunkNum; i++){
      chunks.push(chunkSize);
    }

    chunks.push(lastChunk);
      

    var firstByte = 0;
    var lastByte = 0;
    var totalByte = fileSize.toString();
    
    //チャンクごとに動画アップロードリクエストを送信
    for (var i = 0; i < chunks.length; i++) {
      var chunk = chunks[i];
      lastByte = firstByte + chunk - 1;

      Logger.log(firstByte.toString());
      Logger.log(lastByte.toString());
      Logger.log(totalByte);

      var headers = {
        "Authorization": "Bearer " + access_token,
        "Content-Range": "bytes " + firstByte.toString() + "-" + lastByte.toString() + "/" + totalByte,
        "Content-Type": "application/octet-stream"
      };

      var chunkBlob = chunksBlobs[i];
      
      var options = {
        method: "put",
        contentType: "application/octet-stream",
        headers: headers,
        payload: chunkBlob
      };
      
      try {
        var response = UrlFetchApp.fetch(uploadUrl, options);
        Logger.log("Response: " + response.getResponseCode());
        var headers = response.getHeaders();
        

      } catch (e) {
        Logger.log("Response: " + response.getResponseCode());
        var headers = response.getHeaders();
        Logger.log("OK");
        firstByte = lastByte + 1;
      }
    }
  }
    
  //ビデオIDを取得
  var videoId = JSON.parse(response.getContentText()).id;

  //サムネイル設定関数を実行
  if(thumbnailName){
    setVideoThumbnail(videoId , thumbnailName);
  }

  Logger.log("Success");
}

function readInChunks(file) {
  var fileSize = file.getSize();
  var chunk = 49 *1024 * 1024 
  var fileId = file.getId();

  var accessToken = ScriptApp.getOAuthToken();
  var baseUrl = "https://www.googleapis.com/drive/v3/files/";

  // チャンク数を数える
  var start = 0;
  var end = chunk -1;
  var loop = Math.floor(fileSize / chunk);
  loop = fileSize % chunk > 0 ? loop + 1 : loop;

  // チャンクにわける
  var chunkBlobs = [];
  var url2 = baseUrl + fileId + "?alt=media";
  for (var i = 0; i < loop; i++) {
    Logger.log(start.toString());
    Logger.log(end.toString());
    var headers = {
      Authorization: "Bearer " + accessToken,
      Range: "bytes=" + start + "-" + end,
    };
    var params2 = {
      method: "get",
      headers: headers,
      muteHttpExceptions: true,
    };
    var response = UrlFetchApp.fetch(url2, params2);
    var chunkBlob = response.getBlob();
    chunkBlobs.push(chunkBlob);

    start += chunk;

    if(i != loop-2){
      end = start + chunk- 1;
    }else{
      end = fileSize;
    }
  }
  return chunkBlobs;
}

function setVideoThumbnail(videoId , imageFileName) {
  var imageFile = DriveApp.getFilesByName(imageFileName).next();
  var thumbnailBlob = imageFile.getBlob();

　//サムネイル画像を設定
  var thumbnailUrl = "https://www.googleapis.com/upload/youtube/v3/thumbnails/set?videoId=" + videoId;

  var headers = {
    Authorization: "Bearer " + access_token,
    "Content-Type": thumbnailBlob.getContentType()
  };

  var options = {
    method: "POST",
    headers: headers,
    payload: thumbnailBlob.getBytes(),
    muteHttpExceptions: true
  };

  var response = UrlFetchApp.fetch(thumbnailUrl, options);
  Logger.log(response.getContentText());
}

//アップロード情報を整備
  var title = 'タイトル'
  var description = '説明文';
  var tags = 'タグ'　//カンマ区切り
  var categoryId = 'カテゴリーID' 
  var fileToUpload = '動画ファイル名'
  var thumbnailName = 'サムネイル画像ファイル名'