Reinstate remote user for versions of Caddy after 0.9.5

Author: jung-kurt

README.md

@@ -195,11 +195,6 @@ script may use a different method to read POST content. Secondly, the
 and contains the entire command line, including all arguments, with which the
 CGI script was executed.
 
-**Note**: The basicauth plugin for Caddy 0.9.5 and earlier does not provide
-remote user information to other middleware such as this CGI plugin. To use the
-REMOTE_USER environment variable, you need to wait for Caddy 0.10.0 or build
-your Caddy executable from the current source tree.
-
 When a browser requests
 
 	http://192.168.1.2:8080/show/weekly?mode=summary

cgi.go

@@ -103,9 +103,10 @@ func (h handlerType) ServeHTTP(w http.ResponseWriter, r *http.Request) (code int
 			ok, lfStr, rtStr := match(r.URL.Path, matchStr)
 			if ok {
 				var buf bytes.Buffer
-				// Remote user is not available in Caddy 0.9.5. Use a blank string for
-				// remote user until Caddy 0.10.0.
-				cgiHnd := setupCall(h, rule, lfStr, rtStr, rep, "")
+				// Retrieve name of remote user that was set by some downstream middleware,
+				// possibly basicauth.
+				remoteUser, _ := r.Context().Value(httpserver.RemoteUserCtxKey).(string) // Blank if not set
+				cgiHnd := setupCall(h, rule, lfStr, rtStr, rep, remoteUser)
 				cgiHnd.Stderr = &buf
 				cgiHnd.ServeHTTP(w, r)
 				if buf.Len() > 0 {

cgi.md

@@ -201,11 +201,6 @@ script may use a different method to read POST content. Secondly, the
 and contains the entire command line, including all arguments, with which the
 CGI script was executed.
 
-<mark class="block">**Note**: The basicauth plugin for Caddy 0.9.5 and earlier does not provide
-remote user information to other middleware such as this CGI plugin. To use the
-REMOTE_USER environment variable, you need to wait for Caddy 0.10.0 or build
-your Caddy executable from the current source tree.</mark>
-
 When a browser requests
 
 	http://192.168.1.2:8080/show/weekly?mode=summary

doc.go

@@ -190,11 +190,6 @@ SCRIPT_EXEC variable is not a CGI standard. It is provided by this middleware
 and contains the entire command line, including all arguments, with which the
 CGI script was executed.
 
-Note: The basicauth plugin for Caddy 0.9.5 and earlier does not provide
-remote user information to other middleware such as this CGI plugin. To use the
-REMOTE_USER environment variable, you need to wait for Caddy 0.10.0 or build
-your Caddy executable from the current source tree.
-
 When a browser requests
 
 	http://192.168.1.2:8080/show/weekly?mode=summary

doc.txt

@@ -214,11 +214,6 @@ script may use a different method to read POST content. Secondly, the
 and contains the entire command line, including all arguments, with which the
 CGI script was executed.
 
-**Note**: The basicauth plugin for Caddy 0.9.5 and earlier does not provide
-remote user information to other middleware such as this CGI plugin. To use the
-REMOTE_USER environment variable, you need to wait for Caddy 0.10.0 or build
-your Caddy executable from the current source tree.
-
 When a browser requests
 
 	http://192.168.1.2:8080/show/weekly?mode=summary