Create a post in Blogger with Google Apps Script

Required reading:

• ScriptApp#getOauthToken
• Blogger §post#insert
• UrlFetchApp#fetch
• Editing manifest#Setting explicit scopes
• Switch to standard GCP
• API Library

Issue:

• Usage of asynchronous client side browser samples in the synchronous server side.

Solution:

• It is possible to access Blogger api from Google apps script using UrlFetchApp
• Full OAuth flow can be bypassed using oauth token provided by ScriptApp
• Include scopes in the appsscript.json manifest file.
• Switch to a standard GCP and enable the blogger api

Snippet:

function createBlogPost(){
  var postUrl = "https://www.googleapis.com/blogger/v3/blogs/blogId/posts";
  var blogId = /*"YOUR_BLOG_ID"*/;
  postUrl = postUrl.replace("blogId",blogId);
  var options = {
    method:"post",
    contentType:"application/json",
    headers: { Authorization: "Bearer "+ ScriptApp.getOAuthToken()},
    muteHttpExceptions: true,
    payload: JSON.stringify({
      title: "Hello from Apps Script!",
      content: "This post is automatically created by Apps script"
    })
  }
  var res = UrlFetchApp.fetch(postUrl, options).getContentText();
  console.log(res);//or Logger.log(res)
}

Manifest scopes:

"oauthScopes": [
  "https://www.googleapis.com/auth/blogger",
  "https://www.googleapis.com/auth/script.external_request"
]