unsupported_grant_type

[rodolphopivetta]

I'm trying to authenticate an user following the instructions in the README, but when I request a token for an user, I receive:

{"error": "unsupported_grant_type"}

In my application the "Authorization grant type" field is "password" value:

In [1]: from oauth2_provider.models import Application

In [2]: a = Application.objects.get(id=1)

In [11]: a.authorization_grant_type
Out[11]: u'password'

What I'm doing wrong?

[PhilipGarnero]

Show me your request so I can help you out

[rodolphopivetta]

using the URL

http://127.0.0.1:8000/auth/token/

method: POST

Body:

{
    "grant_type": "password",
    "client_id": "SxOKjAuWdHDw07NIyogYhjOTn6amDVXSG9WjYydn",
    "client_secret": "ejvOxEmloOobtB45USCljfASygtXxpOUbQiWxJwE60RLA7rhTSmWNLi3YonCTj5orKq8JDxyiKa66QP5mAoiu8mu57qJeCPmXv689P3PoSeJcb7Va30wI8dyJjSrazMR",
    "username": "testuser",
    "password": 123
}

[PhilipGarnero]

You are sending an integer instead of a string for the password.

[rodolphopivetta]

Same error as string

{
    "grant_type": "password",
    "client_id": "SxOKjAuWdHDw07NIyogYhjOTn6amDVXSG9WjYydn",
    "client_secret": "ejvOxEmloOobtB45USCljfASygtXxpOUbQiWxJwE60RLA7rhTSmWNLi3YonCTj5orKq8JDxyiKa66QP5mAoiu8mu57qJeCPmXv689P3PoSeJcb7Va30wI8dyJjSrazMR",
    "username": "testuser",
    "password": "123"
}

[rodolphopivetta]

In [1]: from oauth2_provider.models import Application

In [2]: a = Application.objects.get(id=1)

In [3]: a.client_id
Out[3]: u'SxOKjAuWdHDw07NIyogYhjOTn6amDVXSG9WjYydn'

In [4]: a.client_secret
Out[4]: u'ejvOxEmloOobtB45USCljfASygtXxpOUbQiWxJwE60RLA7rhTSmWNLi3YonCTj5orKq8JDxyiKa66QP5mAoiu8mu57qJeCPmXv689P3PoSeJcb7Va30wI8dyJjSrazMR'

In [5]: a.client_type
Out[5]: u'confidential'

In [6]: a.authorization_grant_type
Out[6]: u'password'

In [7]: from users.models import CommonUser

In [8]: c = CommonUser.objects.all().first()

In [9]: c.set_password("123")

In [10]: c.username
Out[10]: u'roger_freeman'

In [11]: c.save()

In postman:

URL: http://127.0.0.1:8000/auth/token/

Method: POST

{
    "client_id": "SxOKjAuWdHDw07NIyogYhjOTn6amDVXSG9WjYydn",
    "client_secret": "ejvOxEmloOobtB45USCljfASygtXxpOUbQiWxJwE60RLA7rhTSmWNLi3YonCTj5orKq8JDxyiKa66QP5mAoiu8mu57qJeCPmXv689P3PoSeJcb7Va30wI8dyJjSrazMR",
    "username": "roger_freeman",
    "password": "123",
    "grant_type": "password"
}

Response:

{
  "error": "unsupported_grant_type"
}

[PhilipGarnero]

Is your Application object set to confidential ?

[rodolphopivetta]

Yes, you can see this in the iPython query above

[rodolphopivetta]

In [1]: from oauth2_provider.models import Application

In [2]: a = Application.objects.get(id=1)

In [5]: a.client_type
Out[5]: u'confidential'

😄

[rodolphopivetta]

I discovered the problem, I'm sending requests with Content-Type: application/json, but apparently the required is Content-Type: application/x-www-form-urlencoded

Why is required x-www-form-urlencoded and not json?

And I suggest you add this requirement in the README 😄

[PhilipGarnero]

I had no idea.
It's probably coming from the oauth toolkit package.

[rodolphopivetta]

I finally resolve my problem adding this in the settings:

OAUTH2_PROVIDER = {
    'OAUTH2_BACKEND_CLASS': 'oauth2_provider.oauth2_backends.JSONOAuthLibCore',
}

Thanks for your attention @PhilipGarnero and consider adding this information in the instructions

[earmc]

good night everbody. I whould like know if someone have problem with made refresh token. I have this answer "unsupported_grant_type" but when i try to post request a refresh token. I appreciate if someone can suggest me some solution

this is my body request:

RequestBody requestBody = new FormEncodingBuilder()

            .add("client_id","confidencial")
            .add("client_secret","confidencial")
            .add("grant_type", "refresh_token")
            .add("refresh_token", tokenRefreshData)
            .add("Content-Type", "application/x-www-form-urlencoded")
            .build();

[yannbu]

@earmc I have the same problem. Did you figure it out ? If yes, how ? Thanks!

[hustzoujia]

@rodolphopivetta thanks for your right answer. :)