From cff99ba167a9eb6f134a576f0438390ddacba38d Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Wed, 15 Apr 2009 18:40:55 -0700
Subject: make Location translate relative path to absolute (HTTP requires
 absolute in protocol).

add URL tests

R=r
DELTA=243  (242 added, 0 deleted, 1 changed)
OCL=27472
CL=27523
---
 src/lib/http/server.go | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

(limited to 'src/lib/http/server.go')

diff --git a/src/lib/http/server.go b/src/lib/http/server.go
index a8aef01f0e..267e9e41e4 100644
--- a/src/lib/http/server.go
+++ b/src/lib/http/server.go
@@ -269,6 +269,49 @@ func NotFoundHandler() Handler {
 // Redirect replies to the request with a redirect to url,
 // which may be a path relative to the request path.
 func Redirect(c *Conn, url string) {
+	u, err := ParseURL(url);
+	if err != nil {
+		// TODO report internal error instead?
+		c.SetHeader("Location", url);
+		c.WriteHeader(StatusMovedPermanently);
+	}
+
+	// If url was relative, make absolute by
+	// combining with request path.
+	// The browser would probably do this for us,
+	// but doing it ourselves is more reliable.
+
+	// NOTE(rsc): RFC 2616 says that the Location
+	// line must be an absolute URI, like
+	// "http://www.google.com/redirect/",
+	// not a path like "/redirect/".
+	// Unfortunately, we don't know what to
+	// put in the host name section to get the
+	// client to connect to us again, so we can't
+	// know the right absolute URI to send back.
+	// Because of this problem, no one pays attention
+	// to the RFC; they all send back just a new path.
+	// So do we.
+	oldpath := c.Req.Url.Path;
+	if oldpath == "" {	// should not happen, but avoid a crash if it does
+		oldpath = "/"
+	}
+	if u.Scheme == "" {
+		// no leading http://server
+		if url == "" || url[0] != '/' {
+			// make relative path absolute
+			olddir, oldfile := path.Split(oldpath);
+			url = olddir + url;
+		}
+
+		// clean up but preserve trailing slash
+		trailing := url[len(url) - 1] == '/';
+		url = path.Clean(url);
+		if trailing && url[len(url) - 1] != '/' {
+			url += "/";
+		}
+	}
+
 	c.SetHeader("Location", url);
 	c.WriteHeader(StatusMovedPermanently);
 }
-- 
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