Add static upstream

docs/configuration/configuration.md

@@ -105,7 +105,7 @@ An example [oauth2_proxy.cfg]({{ site.gitweb }}/contrib/oauth2_proxy.cfg.example
 | `-standard-logging-format` | string | Template for standard log lines | see [Logging Configuration](#logging-configuration) |
 | `-tls-cert-file` | string | path to certificate file | |
 | `-tls-key-file` | string | path to private key file | |
-| `-upstream` | string \| list | the http url(s) of the upstream endpoint or `file://` paths for static files. Routing is based on the path | |
+| `-upstream` | string \| list | the http url(s) of the upstream endpoint, file:// paths for static files or `static://<status_code>` for static response. Routing is based on the path | |
 | `-validate-url` | string | Access token validation endpoint | |
 | `-version` | n/a | print version string | |
 | `-whitelist-domain` | string \| list | allowed domains for redirection after authentication. Prefix domain with a `.` to allow subdomains (eg `.example.com`) | |

main.go

@@ -36,7 +36,7 @@ func main() {
 	flagSet.String("tls-key-file", "", "path to private key file")
 	flagSet.String("redirect-url", "", "the OAuth Redirect URL. ie: \"https://internalapp.yourcompany.com/oauth2/callback\"")
 	flagSet.Bool("set-xauthrequest", false, "set X-Auth-Request-User and X-Auth-Request-Email response headers (useful in Nginx auth_request mode)")
-	flagSet.Var(&upstreams, "upstream", "the http url(s) of the upstream endpoint or file:// paths for static files. Routing is based on the path")
+	flagSet.Var(&upstreams, "upstream", "the http url(s) of the upstream endpoint, file:// paths for static files or static://<status_code> for static response. Routing is based on the path")
 	flagSet.Bool("pass-basic-auth", true, "pass HTTP Basic Auth, X-Forwarded-User and X-Forwarded-Email information to upstream")
 	flagSet.Bool("pass-user-headers", true, "pass X-Forwarded-User and X-Forwarded-Email information to upstream")
 	flagSet.String("basic-auth-password", "", "the password to set when passing the HTTP Basic Auth header")

oauthproxy.go

@@ -12,6 +12,7 @@ import (
 	"net/http/httputil"
 	"net/url"
 	"regexp"
+	"strconv"
 	"strings"
 	"time"
 
@@ -207,6 +208,16 @@ func NewOAuthProxy(opts *Options, validator func(string) bool) *OAuthProxy {
 			proxy := NewWebSocketOrRestReverseProxy(u, opts, auth)
 			serveMux.Handle(path, proxy)
 
+		case "static":
+			serveMux.HandleFunc("/", func(rw http.ResponseWriter, req *http.Request) {
+				responseCode, err := strconv.Atoi(u.Host)
+				if err != nil {
+					logger.Printf("unable to convert %q to int, use default \"200\"", u.Host)
+					responseCode = 200
+				}
+				rw.WriteHeader(responseCode)
+				fmt.Fprintf(rw, "Authenticated")
+			})
 		case "file":
 			if u.Fragment != "" {
 				path = u.Fragment