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package middleware
import (
"net/http"
"github.com/zenazn/goji/web"
)
type subrouter struct {
c *web.C
h http.Handler
}
func (s subrouter) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if s.c.URLParams != nil {
path, ok := s.c.URLParams["*"]
if !ok {
path, ok = s.c.URLParams["_"]
}
if ok {
oldpath := r.URL.Path
oldmatch := web.GetMatch(*s.c)
r.URL.Path = path
if oldmatch.Handler != nil {
delete(s.c.Env, web.MatchKey)
}
defer func() {
r.URL.Path = oldpath
if s.c.Env == nil {
return
}
if oldmatch.Handler != nil {
s.c.Env[web.MatchKey] = oldmatch
} else {
delete(s.c.Env, web.MatchKey)
}
}()
}
}
s.h.ServeHTTP(w, r)
}
/*
SubRouter is a helper middleware that makes writing sub-routers easier.
If you register a sub-router under a key like "/admin/*", Goji's router will
automatically set c.URLParams["*"] to the unmatched path suffix. This middleware
will help you set the request URL's Path to this unmatched suffix, allowing you
to write sub-routers with no knowledge of what routes the parent router matches.
Since Go's regular expressions do not allow you to create a capturing group
named "*", SubRouter also accepts the string "_". For instance, to duplicate the
semantics of the string pattern "/foo/*", you might use the regular expression
"^/foo(?P<_>/.*)$".
This middleware is Match-aware: it will un-set any explicit routing information
contained in the Goji context in order to prevent routing loops when using
explicit routing with sub-routers. See the documentation for Mux.Router for
more.
*/
func SubRouter(c *web.C, h http.Handler) http.Handler {
return subrouter{c, h}
}
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