ref: a3f2d6d23ed1be69fee607bdedadc0438fd01305
dir: /sys/src/libhttpd/redirected.c/
#include <u.h>
#include <libc.h>
#include <bin.h>
#include <httpd.h>
int
hredirected(HConnect *c, char *how, char *uri)
{
Hio *hout;
char *s, *ss, *scheme, *host;
char sayport[NETPATHLEN];
int n;
scheme = c->scheme? c->scheme: "http";
host = c->head.host;
if(strchr(uri, ':') != nil)
host = "";
else if(uri[0] != '/'){
s = strrchr(c->req.uri, '/');
if(s != nil)
*s = '\0';
ss = halloc(c, strlen(c->req.uri) + strlen(uri) + 2 + UTFmax);
sprint(ss, "%s/%s", c->req.uri, uri);
uri = ss;
if(s != nil)
*s = '/';
}
if((strcmp(scheme, "http") == 0 && atoi(c->port) == 80) ||
(strcmp(scheme, "https") == 0 && atoi(c->port) == 443) ||
strchr(host, ':') != nil)
sayport[0] = '\0';
else
snprint(sayport, sizeof sayport, ":%s", c->port);
n = snprint(c->xferbuf, HBufSize,
"<head><title>Redirection</title></head>\r\n"
"<body><h1>Redirection</h1>\r\n"
"Your selection can be found <a href=\"%U\"> here</a>.<p></body>\r\n", uri);
hout = &c->hout;
hprint(hout, "%s %s\r\n", hversion, how);
hprint(hout, "Date: %D\r\n", time(nil));
hprint(hout, "Server: Plan9\r\n");
hprint(hout, "Content-type: text/html\r\n");
hprint(hout, "Content-Length: %d\r\n", n);
if(host == nil || host[0] == 0)
hprint(hout, "Location: %U\r\n", uri);
else
hprint(hout, "Location: %s://%U%s%U\r\n",
scheme, host, sayport, uri);
if(c->head.closeit)
hprint(hout, "Connection: close\r\n");
else if(!http11(c))
hprint(hout, "Connection: Keep-Alive\r\n");
hprint(hout, "\r\n");
if(strcmp(c->req.meth, "HEAD") != 0)
hwrite(hout, c->xferbuf, n);
if(c->replog)
if(host == nil || host[0] == 0)
c->replog(c, "Reply: %s\nRedirect: %U\n", how, uri);
else
c->replog(c, "Reply: %s\nRedirect: %s://%U%s%U\n",
how, scheme, host, sayport, uri);
return hflush(hout);
}
int
hmoved(HConnect *c, char *uri)
{
return hredirected(c, "301 Moved Permanently", uri);
}