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|
package portgate
import (
"net/url"
"path"
"strconv"
"strings"
)
// Destination represents a routing destination the user gave.
type Destination struct {
// Identifier to which port of the destination host the path points to and to which the
// user's request will be proxied to.
Port int
// The path without the port identifier.
// This is the path which will be requested from the destination.
Path string
IsPortgatePath bool
}
// ParseDestinationFromURL creates a Path from the requested URL.
func DestinationFromURL(p string) Destination {
p = path.Clean("/" + p)
// Get first path part, which is the potential port identifier.
destinationIdentifierEnd := strings.Index(p[1:], "/") + 1
// If there is no '/' in the path, apart from the root, the first part is the entire path
if destinationIdentifierEnd == 0 {
destinationIdentifierEnd = len(p)
}
destinationIdentifier := p[1:destinationIdentifierEnd]
// We have to to check that destinationIdentifier is a port
port, err := strconv.Atoi(destinationIdentifier)
if err == nil {
// We got an identifier and can split the path
resourcePath := path.Clean("/" + p[destinationIdentifierEnd:])
return Destination{
Port: port,
Path: resourcePath,
}
} else {
destination := Destination{
Port: 0,
Path: p,
}
if strings.HasPrefix(destination.Path, "/_portgate") {
destination.IsPortgatePath = true
return destination
}
return destination
}
}
// DestinationFromReferer tries to create a Path from the Referer header of the request.
func (d Destination) AddReferer(referer string) Destination {
u, err := url.Parse(referer)
if err != nil {
return Destination{}
}
// d has the correct resource path but the wrong port, so we create a new destination
// with the correct data from both.
newDestination := DestinationFromURL(u.Path)
return Destination{
Port: newDestination.Port,
Path: d.Path,
}
}
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