如何从容器绑定脚本中调用GAS Execution API的run方法？

Question

I have made an target project script as instructed by google in the documentation and followed all the steps for deploying as a API Executable.Enabled the Google apps script execution API also.

In documentation, they have mentioned a Execution API's run method. By using this we can call the projects method. i don't know how to use this in GAS.

This is the target project's script,

/**
 * The function in this script will be called by the Apps Script Execution API.
 */

/**
 * Return the set of folder names contained in the user's root folder as an
 * object (with folder IDs as keys).
 * @return {Object} A set of folder names keyed by folder ID.
 */
function getFoldersUnderRoot() {
  var root = DriveApp.getRootFolder();
  var folders = root.getFolders();
  var folderSet = {};
  while (folders.hasNext()) {
    var folder = folders.next();
    folderSet[folder.getId()] = folder.getName();
  }
  return folderSet;
}

I'd tried following method to call execution API's run method, but it required access token, how can i get the access token in this code.

var access_token=ScriptApp.getOAuthToken();//Returning a string value  
var url = "https://script.googleapis.com/v1/scripts/MvwvW29XZxP77hsnIkgD0H88m6KuyrhZ5:run";
var headers = {
  "Authorization": "Bearer "+access_token,
  "Content-Type": "application/json"
};
var payload = {
  'function': 'getFoldersUnderRoot',
  devMode: true
};
var res = UrlFetchApp.fetch(url, {
  method: "post",
  headers: headers,
  payload: JSON.stringify(payload),
  muteHttpExceptions: true
});

But in response i'm getting this,

{
  "error": {
    "code": 401,
    "message": "ScriptError",
    "status": "UNAUTHENTICATED",
    "details": [
      {
        "@type": "type.googleapis.com/google.apps.script.v1.ExecutionError",
        "errorMessage": "Authorization is required to perform that action.",
        "errorType": "ScriptError"
      }
    ]
  }
}

How can i solve this? Code explanation would be appreciable. Thank you.

Answer 1

How about this sample script? From your question, I could know that you have already done deploying API Executable and enabling Execution API. In order to use Execution API, also an access token with scopes you use is required as you can see at Requirements. Have you already retrieved it? If you don't have it yet, you can retrieve it by checking the Auth Guide . By preparing these, you can use Execution API.

Following sample is for run getFoldersUnderRoot() in the project deployed API Executable. Please copy and paste this sample script to your spreadsheet script editor. Before you use this, please import your access token and script ID of the project deployed API Executable to the script.

Sample script :

var url = "https://script.googleapis.com/v1/scripts/### Script ID ###:run";
var headers = {
  "Authorization": "Bearer ### acces token ###",
  "Content-Type": "application/json"
};
var payload = {
  'function': 'getFoldersUnderRoot',
  devMode: true
};
var res = UrlFetchApp.fetch(url, {
  method: "post",
  headers: headers,
  payload: JSON.stringify(payload),
  muteHttpExceptions: true
});

Result :

Here, the result of getFoldersUnderRoot() is returned as follows.

{
  "done": true,
  "response": {
    "@type": "type.googleapis.com/google.apps.script.v1.ExecutionResponse",
    "result": {
      "### folder id1 ### ": "### folder name1 ###",
      "### folder id2 ### ": "### folder name2 ###",
    }
  }
}