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package main
import (
"fmt"
"net/url"
"path"
"strconv"
"strings"
)
// Path represents a routing destination the user gave.
type Path struct {
// Identifier to which port of the destination host the path points to and to which the
// user's request will be proxied to.
// If there was no identifier given it's -1.
DestinationIdentifier int
// The path without the port identifier.
// This is the path which will be requested from the destination.
ResourcePath string
}
// ParsePath creates a Path from the requested URL.
func ParsePath(p string) Path {
p = path.Clean("/" + p)
// Get first path part, which is the destinationIdentifier
destinationIdentifierEnd := strings.Index(p[1:], "/") + 1
// If there is no '/' at 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 Path{
DestinationIdentifier: port,
ResourcePath: resourcePath,
}
} else {
// We got some other path without an identifier
return Path{
DestinationIdentifier: -1,
ResourcePath: p,
}
}
}
// ParsePathFromReferer tries to create a Path from the Referer header of the request.
func ParsePathFromReferer(p Path, r string) (Path, error) {
u, err := url.Parse(r)
if err != nil {
return Path{}, err
}
// p has the correct resource path but the wrong port, so we create a new path
// with the correct data from both.
rp := ParsePath(u.Path)
return Path{
DestinationIdentifier: rp.DestinationIdentifier,
ResourcePath: p.ResourcePath,
}, nil
}
// MakeUrl creates the URL on the destination host that the user wants to access.
func (p *Path) MakeUrl(targetHost string) string {
// TODO: Figure out what to do with TLS
return fmt.Sprintf("http://%s:%d%s", targetHost, p.DestinationIdentifier, p.ResourcePath)
}
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