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add client_credentials token method #431

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add client_credentials token method #431

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18 changes: 18 additions & 0 deletions oauth2.go
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Original file line number Diff line number Diff line change
Expand Up @@ -198,6 +198,24 @@ func (c *Config) PasswordCredentialsToken(ctx context.Context, username, passwor
return retrieveToken(ctx, c, v)
}

// The Client Credentials grant type is used by clients to obtain an access
// token outside of the context of a user.
//
// This is typically used by clients to access resources about themselves
// rather than to access a user's resources.
// See https://tools.ietf.org/html/rfc6749#section-4.4 for more info.
func (c *Config) ClientCredentialTokens(ctx context.Context) (*Token, error) {
v := url.Values{
"grant_type": {"client_credentials"},
"client_id": {c.ClientID},
"client_secret": {c.ClientSecret},
}
if len(c.Scopes) > 0 {
v.Set("scope", strings.Join(c.Scopes, " "))
}
return retrieveToken(ctx, c, v)
}

// Exchange converts an authorization code into a token.
//
// It is used after a resource provider redirects the user back
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