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cmd/tsidp: allow CORS requests to openid-configuration (#15229)

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Add support for Cross-Origin XHR requests to the openid-configuration
endpoint to enable clients like Grafana's auto-population of OIDC setup
data from its contents.

Updates https://github.com/tailscale/tailscale/issues/10263

Signed-off-by: Patrick O'Doherty <patrick@tailscale.com>
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Patrick O'Doherty 2025-03-11 13:10:22 -07:00 committed by GitHub
parent 03f7f1860e
commit 8f0080c7a4
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1 changed files with 12 additions and 0 deletions
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12
cmd/tsidp/tsidp.go
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@ -765,6 +765,18 @@ var (
)
func (s *idpServer) serveOpenIDConfig(w http.ResponseWriter, r *http.Request) {
h := w.Header()
h.Set("Access-Control-Allow-Origin", "*")
h.Set("Access-Control-Allow-Method", "GET, OPTIONS")
// allow all to prevent errors from client sending their own bespoke headers
// and having the server reject the request.
h.Set("Access-Control-Allow-Headers", "*")
// early return for pre-flight OPTIONS requests.
if r.Method == "OPTIONS" {
w.WriteHeader(http.StatusOK)
return
}
if r.URL.Path != oidcConfigPath {
http.Error(w, "tsidp: not found", http.StatusNotFound)
return