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