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readonly.go
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readonly.go
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// Copyright (c) 2017 VMware, Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package filter
import (
"net/http"
"regexp"
"github.com/astaxie/beego/context"
"github.com/vmware/harbor/src/common/utils/log"
"github.com/vmware/harbor/src/ui/config"
)
const (
repoURL = `^/api/repositories/((?:[a-z0-9]+(?:[._-][a-z0-9]+)*/)+)(?:[a-z0-9]+(?:[._-][a-z0-9]+)*)$`
tagURL = `^/api/repositories/((?:[a-z0-9]+(?:[._-][a-z0-9]+)*/)+)tags/([\w][\w.-]{0,127})$`
labelURL = `^/api/repositories/((?:[a-z0-9]+(?:[._-][a-z0-9]+)*/)+)tags/([\w][\w.-]{0,127})/labels/[0-9]+$`
)
//ReadonlyFilter filters the delete repo/tag request and returns 503.
func ReadonlyFilter(ctx *context.Context) {
filter(ctx.Request, ctx.ResponseWriter)
}
func filter(req *http.Request, resp http.ResponseWriter) {
if !config.ReadOnly() {
return
}
if req.Method != http.MethodDelete {
return
}
if matchRepoTagDelete(req) {
resp.WriteHeader(http.StatusServiceUnavailable)
_, err := resp.Write([]byte("The system is in read only mode. Any modification is prohibited."))
if err != nil {
log.Errorf("failed to write response body: %v", err)
}
}
}
// Only block repository and tag deletion
func matchRepoTagDelete(req *http.Request) bool {
if inWhiteList(req) {
return false
}
re := regexp.MustCompile(tagURL)
s := re.FindStringSubmatch(req.URL.Path)
if len(s) == 3 {
return true
}
re = regexp.MustCompile(repoURL)
s = re.FindStringSubmatch(req.URL.Path)
if len(s) == 2 {
return true
}
return false
}
func inWhiteList(req *http.Request) bool {
re := regexp.MustCompile(labelURL)
s := re.FindStringSubmatch(req.URL.Path)
if len(s) == 3 {
return true
}
return false
}