traefik/pkg/rules/rules.go

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package rules
import (
"fmt"
"net/http"
"strings"
"unicode/utf8"
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"github.com/gorilla/mux"
"github.com/traefik/traefik/v2/pkg/log"
"github.com/traefik/traefik/v2/pkg/middlewares/requestdecorator"
"github.com/vulcand/predicate"
)
var funcs = map[string]func(*mux.Route, ...string) error{
"Host": host,
"HostHeader": host,
"HostRegexp": hostRegexp,
"Path": path,
"PathPrefix": pathPrefix,
"Method": methods,
"Headers": headers,
"HeadersRegexp": headersRegexp,
"Query": query,
}
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// Router handle routing with rules.
type Router struct {
*mux.Router
parser predicate.Parser
}
// NewRouter returns a new router instance.
func NewRouter() (*Router, error) {
parser, err := newParser()
if err != nil {
return nil, err
}
return &Router{
Router: mux.NewRouter().SkipClean(true),
parser: parser,
}, nil
}
// AddRoute add a new route to the router.
func (r *Router) AddRoute(rule string, priority int, handler http.Handler) error {
parse, err := r.parser.Parse(rule)
if err != nil {
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return fmt.Errorf("error while parsing rule %s: %w", rule, err)
}
buildTree, ok := parse.(treeBuilder)
if !ok {
return fmt.Errorf("error while parsing rule %s", rule)
}
if priority == 0 {
priority = len(rule)
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}
route := r.NewRoute().Handler(handler).Priority(priority)
err = addRuleOnRoute(route, buildTree())
if err != nil {
route.BuildOnly()
return err
}
return nil
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}
type tree struct {
matcher string
value []string
ruleLeft *tree
ruleRight *tree
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}
func path(route *mux.Route, paths ...string) error {
rt := route.Subrouter()
for _, path := range paths {
tmpRt := rt.Path(path)
if tmpRt.GetError() != nil {
return tmpRt.GetError()
}
}
return nil
}
func pathPrefix(route *mux.Route, paths ...string) error {
rt := route.Subrouter()
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for _, path := range paths {
tmpRt := rt.PathPrefix(path)
if tmpRt.GetError() != nil {
return tmpRt.GetError()
}
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}
return nil
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}
func host(route *mux.Route, hosts ...string) error {
for i, host := range hosts {
if !IsASCII(host) {
return fmt.Errorf("invalid value %q for \"Host\" matcher, non-ASCII characters are not allowed", host)
}
hosts[i] = strings.ToLower(host)
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}
route.MatcherFunc(func(req *http.Request, _ *mux.RouteMatch) bool {
reqHost := requestdecorator.GetCanonizedHost(req.Context())
if len(reqHost) == 0 {
log.FromContext(req.Context()).Warnf("Could not retrieve CanonizedHost, rejecting %s", req.Host)
return false
}
flatH := requestdecorator.GetCNAMEFlatten(req.Context())
if len(flatH) > 0 {
for _, host := range hosts {
if strings.EqualFold(reqHost, host) || strings.EqualFold(flatH, host) {
return true
}
log.FromContext(req.Context()).Debugf("CNAMEFlattening: request %s which resolved to %s, is not matched to route %s", reqHost, flatH, host)
}
return false
}
for _, host := range hosts {
if reqHost == host {
return true
}
// Check for match on trailing period on host
if last := len(host) - 1; last >= 0 && host[last] == '.' {
h := host[:last]
if reqHost == h {
return true
}
}
// Check for match on trailing period on request
if last := len(reqHost) - 1; last >= 0 && reqHost[last] == '.' {
h := reqHost[:last]
if h == host {
return true
}
}
}
return false
})
return nil
}
func hostRegexp(route *mux.Route, hosts ...string) error {
router := route.Subrouter()
for _, host := range hosts {
if !IsASCII(host) {
return fmt.Errorf("invalid value %q for HostRegexp matcher, non-ASCII characters are not allowed", host)
}
tmpRt := router.Host(host)
if tmpRt.GetError() != nil {
return tmpRt.GetError()
}
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}
return nil
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}
func methods(route *mux.Route, methods ...string) error {
return route.Methods(methods...).GetError()
}
func headers(route *mux.Route, headers ...string) error {
return route.Headers(headers...).GetError()
}
func headersRegexp(route *mux.Route, headers ...string) error {
return route.HeadersRegexp(headers...).GetError()
}
func query(route *mux.Route, query ...string) error {
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var queries []string
for _, elem := range query {
queries = append(queries, strings.Split(elem, "=")...)
}
route.Queries(queries...)
// Queries can return nil so we can't chain the GetError()
return route.GetError()
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}
func addRuleOnRouter(router *mux.Router, rule *tree) error {
switch rule.matcher {
case "and":
route := router.NewRoute()
err := addRuleOnRoute(route, rule.ruleLeft)
if err != nil {
return err
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}
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return addRuleOnRoute(route, rule.ruleRight)
case "or":
err := addRuleOnRouter(router, rule.ruleLeft)
if err != nil {
return err
}
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return addRuleOnRouter(router, rule.ruleRight)
default:
err := checkRule(rule)
if err != nil {
return err
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}
return funcs[rule.matcher](router.NewRoute(), rule.value...)
}
}
func addRuleOnRoute(route *mux.Route, rule *tree) error {
switch rule.matcher {
case "and":
err := addRuleOnRoute(route, rule.ruleLeft)
if err != nil {
return err
}
return addRuleOnRoute(route, rule.ruleRight)
case "or":
subRouter := route.Subrouter()
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err := addRuleOnRouter(subRouter, rule.ruleLeft)
if err != nil {
return err
}
return addRuleOnRouter(subRouter, rule.ruleRight)
default:
err := checkRule(rule)
if err != nil {
return err
}
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return funcs[rule.matcher](route, rule.value...)
}
}
func checkRule(rule *tree) error {
if len(rule.value) == 0 {
return fmt.Errorf("no args for matcher %s", rule.matcher)
}
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for _, v := range rule.value {
if len(v) == 0 {
return fmt.Errorf("empty args for matcher %s, %v", rule.matcher, rule.value)
}
}
return nil
}
// IsASCII checks if the given string contains only ASCII characters.
func IsASCII(s string) bool {
for i := 0; i < len(s); i++ {
if s[i] >= utf8.RuneSelf {
return false
}
}
return true
}