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clientcredentials: allow override of grant_type

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Password-based authentication to the [Keycloak](https://www.keycloak.org/) API requires `grant_type` to be `password`. It would be very helpful if `golang.org/x/oauth2` could be used for this, and all's that missing is the ability to override `grant_type`.

Fixes #283

Change-Id: I439dccb3e57042571ad92f115442ae1b7d59d4e0
GitHub-Last-Rev: 0e6f85e31e
GitHub-Pull-Request: golang/oauth2#363
Reviewed-on: https://go-review.googlesource.com/c/158517
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Tom Payne
2019-01-29 22:49:30 +00:00
committed by Brad Fitzpatrick
parent 5dab4167f3
commit 99b60b757e
2 changed files with 40 additions and 1 deletions
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4
clientcredentials/clientcredentials.go
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@@ -90,7 +90,9 @@ func (c *tokenSource) Token() (*oauth2.Token, error) {
v.Set("scope", strings.Join(c.conf.Scopes, " "))
}
for k, p := range c.conf.EndpointParams {
if _, ok := v[k]; ok {
// Allow grant_type to be overridden to allow interoperability with
// non-compliant implementations.
if _, ok := v[k]; ok && k != "grant_type" {
return nil, fmt.Errorf("oauth2: cannot overwrite parameter %q", k)
}
v[k] = p