Fix conversion of static responses in upstreams

CHANGELOG.md

@@ -9,6 +9,7 @@
 ## Changes since v6.1.0
 
 - [#729](https://github.com/oauth2-proxy/oauth2-proxy/pull/729) Use X-Forwarded-Host consistently when set (@NickMeves)
+- [#746](https://github.com/oauth2-proxy/oauth2-proxy/pull/746) Fix conversion of static responses in upstreams (@JoelSpeed)
 
 # v6.1.0
 

pkg/apis/options/legacy_options.go

@@ -97,17 +97,18 @@ func (l *LegacyUpstreams) convert() (Upstreams, error) {
 			upstream.Static = true
 			upstream.StaticCode = &responseCode
 
-			// These are not allowed to be empty and must be unique
+			// This is not allowed to be empty and must be unique
 			upstream.ID = upstreamString
-			upstream.Path = upstreamString
+
+			// We only support the root path in the legacy config
+			upstream.Path = "/"
 
 			// Force defaults compatible with static responses
 			upstream.URI = ""
 			upstream.InsecureSkipTLSVerify = false
 			upstream.PassHostHeader = nil
 			upstream.ProxyWebSockets = nil
-			flush := 1 * time.Second
+			upstream.FlushInterval = nil
-			upstream.FlushInterval = &flush
 		}
 
 		upstreams = append(upstreams, upstream)

pkg/apis/options/legacy_options_test.go

@@ -21,9 +21,10 @@ var _ = Describe("Legacy Options", func() {
 			legacyOpts.LegacyUpstreams.PassHostHeader = true
 			legacyOpts.LegacyUpstreams.ProxyWebSockets = true
 			legacyOpts.LegacyUpstreams.SSLUpstreamInsecureSkipVerify = true
-			legacyOpts.LegacyUpstreams.Upstreams = []string{"http://foo.bar/baz", "file://var/lib/website#/bar"}
+			legacyOpts.LegacyUpstreams.Upstreams = []string{"http://foo.bar/baz", "file://var/lib/website#/bar", "static://204"}
 
 			truth := true
+			staticCode := 204
 			opts.UpstreamServers = Upstreams{
 				{
 					ID:                    "/baz",
@@ -43,6 +44,17 @@ var _ = Describe("Legacy Options", func() {
 					PassHostHeader:        &truth,
 					ProxyWebSockets:       &truth,
 				},
+				{
+					ID:                    "static://204",
+					Path:                  "/",
+					URI:                   "",
+					Static:                true,
+					StaticCode:            &staticCode,
+					FlushInterval:         nil,
+					InsecureSkipTLSVerify: false,
+					PassHostHeader:        nil,
+					ProxyWebSockets:       nil,
+				},
 			}
 
 			converted, err := legacyOpts.ToOptions()
@@ -58,8 +70,6 @@ var _ = Describe("Legacy Options", func() {
 			errMsg            string
 		}
 
-		defaultFlushInterval := 1 * time.Second
-
 		// Non defaults for these options
 		skipVerify := true
 		passHostHeader := false
@@ -105,28 +115,28 @@ var _ = Describe("Legacy Options", func() {
 		validStaticCode := 204
 		validStaticUpstream := Upstream{
 			ID:                    validStatic,
-			Path:                  validStatic,
+			Path:                  "/",
 			URI:                   "",
 			Static:                true,
 			StaticCode:            &validStaticCode,
 			InsecureSkipTLSVerify: false,
 			PassHostHeader:        nil,
 			ProxyWebSockets:       nil,
-			FlushInterval:         &defaultFlushInterval,
+			FlushInterval:         nil,
 		}
 
 		invalidStatic := "static://abc"
 		invalidStaticCode := 200
 		invalidStaticUpstream := Upstream{
 			ID:                    invalidStatic,
-			Path:                  invalidStatic,
+			Path:                  "/",
 			URI:                   "",
 			Static:                true,
 			StaticCode:            &invalidStaticCode,
 			InsecureSkipTLSVerify: false,
 			PassHostHeader:        nil,
 			ProxyWebSockets:       nil,
-			FlushInterval:         &defaultFlushInterval,
+			FlushInterval:         nil,
 		}
 
 		invalidHTTP := ":foo"

pkg/upstream/proxy.go

@@ -56,6 +56,7 @@ func (m *multiUpstreamProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request
 
 // registerStaticResponseHandler registers a static response handler with at the given path.
 func (m *multiUpstreamProxy) registerStaticResponseHandler(upstream options.Upstream) {
+	logger.Printf("mapping path %q => static response %d", upstream.Path, derefStaticCode(upstream.StaticCode))
 	m.serveMux.Handle(upstream.Path, newStaticResponseHandler(upstream.ID, upstream.StaticCode))
 }
 

pkg/upstream/static.go

@@ -10,12 +10,8 @@ const defaultStaticResponseCode = 200
 // newStaticResponseHandler creates a new staticResponseHandler that serves a
 // a static response code.
 func newStaticResponseHandler(upstream string, code *int) http.Handler {
-	if code == nil {
-		c := defaultStaticResponseCode
-		code = &c
-	}
 	return &staticResponseHandler{
-		code:     *code,
+		code:     derefStaticCode(code),
 		upstream: upstream,
 	}
 }
@@ -32,3 +28,11 @@ func (s *staticResponseHandler) ServeHTTP(rw http.ResponseWriter, req *http.Requ
 	rw.WriteHeader(s.code)
 	fmt.Fprintf(rw, "Authenticated")
 }
+
+// derefStaticCode returns the derefenced value, or the default if the value is nil
+func derefStaticCode(code *int) int {
+	if code != nil {
+		return *code
+	}
+	return defaultStaticResponseCode
+}