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redirect.go
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redirect.go
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package kubernetes
import (
"fmt"
"net/http"
"strconv"
log "github.com/sirupsen/logrus"
"github.com/zalando/skipper/dataclients/kubernetes/definitions"
"github.com/zalando/skipper/eskip"
"github.com/zalando/skipper/routing"
)
const (
redirectAnnotationKey = "zalando.org/skipper-ingress-redirect"
redirectCodeAnnotationKey = "zalando.org/skipper-ingress-redirect-code"
forwardedProtoHeader = "X-Forwarded-Proto"
)
type redirectInfo struct {
defaultEnabled, enable, disable, override bool
defaultCode, code int
setHostCode map[string]int
disableHost map[string]bool
}
func createRedirectInfo(defaultEnabled bool, defaultCode int) *redirectInfo {
return &redirectInfo{
defaultEnabled: defaultEnabled,
defaultCode: defaultCode,
setHostCode: make(map[string]int),
disableHost: make(map[string]bool),
}
}
func (r *redirectInfo) initCurrent(m *definitions.Metadata) {
r.enable = !r.defaultEnabled && m.Annotations[redirectAnnotationKey] == "true"
r.disable = r.defaultEnabled && m.Annotations[redirectAnnotationKey] == "false"
r.code = r.defaultCode
if annotationCode, ok := m.Annotations[redirectCodeAnnotationKey]; ok {
var err interface{}
if r.code, err = strconv.Atoi(annotationCode); err != nil ||
r.code < http.StatusMultipleChoices ||
r.code >= http.StatusBadRequest {
if err == nil {
err = annotationCode
}
log.Error("invalid redirect code annotation:", err)
r.code = r.defaultCode
}
}
r.override = r.defaultEnabled && !r.disable && r.code != r.defaultCode
}
func (r *redirectInfo) setHost(host string) {
r.setHostCode[host] = r.code
}
func (r *redirectInfo) setHostDisabled(host string) {
r.disableHost[host] = true
}
func (r *redirectInfo) updateHost(host string) {
if r.enable || r.override {
r.setHost(host)
}
if r.disable {
r.setHostDisabled(host)
}
}
func routeIDForRedirectRoute(baseID string, enable bool) string {
f := "%s_https_redirect"
if !enable {
f = "%s_disable_https_redirect"
}
return fmt.Sprintf(f, baseID)
}
func initRedirectRoute(r *eskip.Route, code int) {
if r.Headers == nil {
r.Headers = make(map[string]string)
}
r.Headers[forwardedProtoHeader] = "http"
// Give this route a higher weight so that it will get precedence over existing routes
r.Predicates = append([]*eskip.Predicate{{
Name: routing.WeightPredicateName,
Args: []interface{}{float64(1000)},
}}, r.Predicates...)
r.Filters = append(r.Filters, &eskip.Filter{
Name: "redirectTo",
Args: []interface{}{float64(code), "https:"},
})
r.BackendType = eskip.ShuntBackend
r.Backend = ""
}
func initDisableRedirectRoute(r *eskip.Route) {
if r.Headers == nil {
r.Headers = make(map[string]string)
}
r.Headers[forwardedProtoHeader] = "http"
// Give this route a higher weight so that it will get precedence over existing routes
r.Predicates = append([]*eskip.Predicate{{
Name: routing.WeightPredicateName,
Args: []interface{}{float64(1000)},
}}, r.Predicates...)
}
func globalRedirectRoute(code int) *eskip.Route {
r := &eskip.Route{Id: httpRedirectRouteID}
initRedirectRoute(r, code)
return r
}
func createIngressEnableHTTPSRedirect(r *eskip.Route, code int) *eskip.Route {
rr := *r
rr.Id = routeIDForRedirectRoute(rr.Id, true)
initRedirectRoute(&rr, code)
return &rr
}
func createIngressDisableHTTPSRedirect(r *eskip.Route) *eskip.Route {
rr := *r
rr.Id = routeIDForRedirectRoute(rr.Id, false)
initDisableRedirectRoute(&rr)
return &rr
}
func hasProtoPredicate(r *eskip.Route) bool {
if r.Headers != nil {
for name := range r.Headers {
if http.CanonicalHeaderKey(name) == forwardedProtoHeader {
return true
}
}
}
if r.HeaderRegexps != nil {
for name := range r.HeaderRegexps {
if http.CanonicalHeaderKey(name) == forwardedProtoHeader {
return true
}
}
}
for _, p := range r.Predicates {
if p.Name != "Header" && p.Name != "HeaderRegexp" {
continue
}
if len(p.Args) > 0 && p.Args[0] == forwardedProtoHeader {
return true
}
}
return false
}
func createHTTPSRedirect(code int, r *eskip.Route) *eskip.Route {
// copy to avoid unexpected mutations
rr := eskip.Copy(r)
rr.Id = routeIDForRedirectRoute(rr.Id, true)
rr.BackendType = eskip.ShuntBackend
rr.Predicates = append(rr.Predicates, &eskip.Predicate{
Name: "Header",
Args: []interface{}{forwardedProtoHeader, "http"},
})
rr.Filters = append(rr.Filters, &eskip.Filter{
Name: "redirectTo",
Args: []interface{}{float64(code), "https:"},
})
return rr
}