traefik/rules.go

139 lines
3.6 KiB
Go
Raw Normal View History

package main
import (
"errors"
"github.com/gorilla/mux"
"net/http"
"reflect"
"sort"
"strings"
)
// Rules holds rule parsing and configuration
type Rules struct {
route *serverRoute
}
func (r *Rules) host(hosts ...string) *mux.Route {
return r.route.route.MatcherFunc(func(req *http.Request, route *mux.RouteMatch) bool {
for _, host := range hosts {
if strings.EqualFold(req.Host, strings.TrimSpace(host)) {
return true
}
}
return false
})
}
func (r *Rules) hostRegexp(hosts ...string) *mux.Route {
router := r.route.route.Subrouter()
for _, host := range hosts {
router.Host(strings.TrimSpace(host))
}
return r.route.route
}
func (r *Rules) path(paths ...string) *mux.Route {
router := r.route.route.Subrouter()
for _, path := range paths {
router.Path(strings.TrimSpace(path))
}
return r.route.route
}
func (r *Rules) pathPrefix(paths ...string) *mux.Route {
router := r.route.route.Subrouter()
for _, path := range paths {
router.PathPrefix(strings.TrimSpace(path))
}
return r.route.route
}
type bySize []string
func (a bySize) Len() int { return len(a) }
func (a bySize) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a bySize) Less(i, j int) bool { return len(a[i]) > len(a[j]) }
func (r *Rules) pathStrip(paths ...string) *mux.Route {
sort.Sort(bySize(paths))
r.route.stripPrefixes = paths
router := r.route.route.Subrouter()
for _, path := range paths {
router.Path(strings.TrimSpace(path))
}
return r.route.route
}
func (r *Rules) pathPrefixStrip(paths ...string) *mux.Route {
sort.Sort(bySize(paths))
r.route.stripPrefixes = paths
router := r.route.route.Subrouter()
for _, path := range paths {
router.PathPrefix(strings.TrimSpace(path))
}
return r.route.route
}
func (r *Rules) methods(methods ...string) *mux.Route {
return r.route.route.Methods(methods...)
}
func (r *Rules) headers(headers ...string) *mux.Route {
return r.route.route.Headers(headers...)
}
func (r *Rules) headersRegexp(headers ...string) *mux.Route {
return r.route.route.HeadersRegexp(headers...)
}
// Parse parses rules expressions
func (r *Rules) Parse(expression string) (*mux.Route, error) {
functions := map[string]interface{}{
"Host": r.host,
"HostRegexp": r.hostRegexp,
"Path": r.path,
"PathStrip": r.pathStrip,
"PathPrefix": r.pathPrefix,
"PathPrefixStrip": r.pathPrefixStrip,
"Method": r.methods,
"Headers": r.headers,
"HeadersRegexp": r.headersRegexp,
}
f := func(c rune) bool {
return c == ':'
}
// get function
parsedFunctions := strings.FieldsFunc(expression, f)
if len(parsedFunctions) == 0 {
return nil, errors.New("Error parsing rule: " + expression)
}
parsedFunction, ok := functions[parsedFunctions[0]]
if !ok {
return nil, errors.New("Error parsing rule: " + expression + ". Unknow function: " + parsedFunctions[0])
}
parsedFunctions = append(parsedFunctions[:0], parsedFunctions[1:]...)
fargs := func(c rune) bool {
return c == ',' || c == ';'
}
// get function
parsedArgs := strings.FieldsFunc(strings.Join(parsedFunctions, ":"), fargs)
if len(parsedArgs) == 0 {
return nil, errors.New("Error parsing args from rule: " + expression)
}
inputs := make([]reflect.Value, len(parsedArgs))
for i := range parsedArgs {
inputs[i] = reflect.ValueOf(parsedArgs[i])
}
method := reflect.ValueOf(parsedFunction)
if method.IsValid() {
resultRoute := method.Call(inputs)[0].Interface().(*mux.Route)
if resultRoute.GetError() != nil {
return nil, resultRoute.GetError()
}
return resultRoute, nil
}
return nil, errors.New("Method not found: " + parsedFunctions[0])
}