Create a post in Blogger with Google Apps Script - google-apps-script

Question

So far I haven't found a good code to create posts in Blogger with Google Script.
In the API Console I got the following credentials:
Client ID
Client Secret
API key
Also, libraries were added to the Google Script:
OAuth2 library → MswhXl8fVhTFUH_Q3UOJbXvxhMjh3Sh48
Blogger library → M2CuWgtxF1cPLI9mdRG5_9sh00DPSBbB3
I tried some codes, and this is the current one:
function create_blog_post() {
var payload =
{
"kind": "blogger#post",
"blog": {
"id": "12345........" // YOUR_BLOG_ID
},
"title": "New post",
"content": "With content..."
};
var headers = {
"Authorization": "Bearer " + getService().getAccessToken(), // ← THIS IS WRONG
"X-HTTP-Method-Override": "PATCH"
};
var options =
{
"method" : "post",
"headers" : { "Authorization" : "Bearer" + getService().getAccessToken()},
"contentType" : "application/json",
"payload" : '{ "kind": "blogger#post", "blog": { "id": "12345........" }, "title": "New post", "content": "With content..." }'
};
try {
var result = UrlFetchApp.fetch(
"https://www.googleapis.com/blogger/v3/blogs/12345......../posts", options);
Logger.log(result);
} catch (e) {Logger.log(e);}
}
Please help me solve this with the simplest code possible.

Answer 1

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"
]