131 lines
2.9 KiB
Go
131 lines
2.9 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package redirect
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import (
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"net/http"
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"net/url"
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"strings"
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extensions "k8s.io/api/extensions/v1beta1"
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"k8s.io/ingress-nginx/ingress/annotations/parser"
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"k8s.io/ingress-nginx/ingress/errors"
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)
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const (
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permanent = "ingress.kubernetes.io/permanent-redirect"
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temporal = "ingress.kubernetes.io/temporal-redirect"
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www = "ingress.kubernetes.io/from-to-www-redirect"
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)
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// Redirect returns the redirect configuration for an Ingress rule
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type Redirect struct {
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URL string `json:"url"`
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Code int `json:"code"`
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FromToWWW bool `json:"fromToWWW"`
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}
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type redirect struct{}
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// NewParser creates a new redirect annotation parser
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func NewParser() parser.IngressAnnotation {
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return redirect{}
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}
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// Parse parses the annotations contained in the ingress
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// rule used to create a redirect in the paths defined in the rule.
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// If the Ingress containes both annotations the execution order is
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// temporal and then permanent
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func (a redirect) Parse(ing *extensions.Ingress) (interface{}, error) {
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r3w, _ := parser.GetBoolAnnotation(www, ing)
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tr, err := parser.GetStringAnnotation(temporal, ing)
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if err != nil && !errors.IsMissingAnnotations(err) {
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return nil, err
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}
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if tr != "" {
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if err := isValidURL(tr); err != nil {
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return nil, err
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}
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return &Redirect{
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URL: tr,
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Code: http.StatusFound,
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FromToWWW: r3w,
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}, nil
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}
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pr, err := parser.GetStringAnnotation(permanent, ing)
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if err != nil && !errors.IsMissingAnnotations(err) {
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return nil, err
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}
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if pr != "" {
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if err := isValidURL(pr); err != nil {
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return nil, err
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}
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return &Redirect{
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URL: pr,
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Code: http.StatusMovedPermanently,
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FromToWWW: r3w,
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}, nil
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}
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if r3w {
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return &Redirect{
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FromToWWW: r3w,
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}, nil
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}
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return nil, errors.ErrMissingAnnotations
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}
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// Equal tests for equality between two Redirect types
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func (r1 *Redirect) Equal(r2 *Redirect) bool {
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if r1 == r2 {
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return true
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}
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if r1 == nil || r2 == nil {
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return false
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}
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if r1.URL != r2.URL {
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return false
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}
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if r1.Code != r2.Code {
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return false
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}
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if r1.FromToWWW != r2.FromToWWW {
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return false
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}
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return true
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}
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func isValidURL(s string) error {
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u, err := url.Parse(s)
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if err != nil {
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return err
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}
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if !strings.HasPrefix(u.Scheme, "http") {
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return errors.Errorf("only http and https are valid protocols (%v)", u.Scheme)
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}
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return nil
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}
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