How do I form a oauth2 password-grant request using webwrite [grant_type = "password" ]

How do I request an access token using Oauth2 with the grant_type = "password"

https://www.oauth.com/oauth2-servers/access-tokens/ password-grant/

I have tried:

client_id = 'client_id_FILL';%'YOUR CLIENT ID ';
client_secret = 'client_secret_FILL';%'YOUR CLIENT SECRET ';

url = 'https://your_url/connect/token';
username = 'usernameFILL';
password='passwFILL';
scope = 'scope-FILL';

headerFields = {'Content-type' 'application/x-www-form-urlencoded';'charset' 'UTF-8'};
options = weboptions('HeaderFields', headerFields);

response = webwrite(url,...
'client_id', client_id,...
'client_secret', client_secret,...
'grant_type','password',...
'scope',scope,... 
'username',username,...
'password',password,...
options);

resulting in

Error using readContentFromWebService (line 46)
The server returned the status 400 with message "Bad Request" in response to the request to URL

Problem solved:

the above code is working. In my case, the error originated from server side, where there was an issue with the username and password.

[Fritjof Basan]

Worked for me. Thank you for sharing this!

Answer 1

[Steven Remington]

I would look into the link below which forms an oauth2 for google api:

https://www.mathworks.com/matlabcentral/answers/264403-how-can-i-access-an-api-which-requires-oauth-2-0-authorization-such-as-google-apis

The above link shows how the request is formed to construct a weboptions object.

[Robin Lataire]

Thanks for the input. I used your above reference to write the code. Meanwhile, the error was solved. The above code is working. In my case, the error originated from server side, where there was an issue with the username and password.