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reverseproxy.go
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reverseproxy.go
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package disguard // import "go.zeta.pm/disguard"
import (
"log"
"net/http"
"net/http/httputil"
"net/url"
"strings"
)
func singleJoiningSlash(a, b string) string {
aslash := strings.HasSuffix(a, "/")
bslash := strings.HasPrefix(b, "/")
switch {
case aslash && bslash:
return a + b[1:]
case !aslash && !bslash:
return a + "/" + b
}
return a + b
}
// WrappedReverseProxy wraps httputil reverse proxy handler to provide RequireSession
// Support so it would redirect to login.
type WrappedReverseProxy struct {
*httputil.ReverseProxy
sess *Session
}
// IsIgnoredPath checks whatever the path is ignored in the config
func (o *Session) isIgnoredPath(path string) bool {
for _, c := range o.config.IgnoredPaths {
if c == path {
return true
}
}
return false
}
func (w *WrappedReverseProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
if w.sess.config.RequireSession {
u, err := w.sess.getSession(req)
if (err != nil || len(u.Whitelisted) == 0) && !w.sess.isIgnoredPath(req.URL.Path) {
http.Redirect(rw, req, "/oauth/login", http.StatusFound)
return
}
}
w.ReverseProxy.ServeHTTP(rw, req)
}
// ReverseHandler ...
func (o *Session) ReverseHandler() *WrappedReverseProxy {
target, err := url.Parse(o.config.ProxyAddress)
if err != nil {
log.Fatal(err)
}
targetQuery := target.RawQuery
director := func(req *http.Request) {
req.URL.Scheme = target.Scheme
req.URL.Host = target.Host
req.URL.Path = singleJoiningSlash(target.Path, req.URL.Path)
if targetQuery == "" || req.URL.RawQuery == "" {
req.URL.RawQuery = targetQuery + req.URL.RawQuery
} else {
req.URL.RawQuery = targetQuery + "&" + req.URL.RawQuery
}
if _, ok := req.Header["User-Agent"]; !ok {
// explicitly disable User-Agent so it's not set to default value
req.Header.Set("User-Agent", "")
}
if u, err := o.getSession(req); err == nil {
req.Header.Set(o.config.HeaderName, strings.Join(u.Whitelisted, ","))
} else {
req.Header.Set(o.config.HeaderName, "")
}
}
return &WrappedReverseProxy{&httputil.ReverseProxy{Director: director}, o}
}