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https://github.com/k3s-io/k3s.git
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e8381db778
* Update Kubernetes to v1.21.0 * Update to golang v1.16.2 * Update dependent modules to track with upstream * Switch to upstream flannel * Track changes to upstream cloud-controller-manager and FeatureGates Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
67 lines
2.0 KiB
Go
67 lines
2.0 KiB
Go
// Copyright 2018 flannel authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package kube
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import (
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"errors"
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"regexp"
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"strings"
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)
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type annotations struct {
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SubnetKubeManaged string
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BackendData string
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BackendType string
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BackendPublicIP string
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BackendPublicIPOverwrite string
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}
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func newAnnotations(prefix string) (annotations, error) {
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slashCnt := strings.Count(prefix, "/")
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if slashCnt > 1 {
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return annotations{}, errors.New("subnet/kube: prefix can contain at most single slash")
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}
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if slashCnt == 0 {
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prefix += "/"
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}
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if !strings.HasSuffix(prefix, "/") && !strings.HasSuffix(prefix, "-") {
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prefix += "-"
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}
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// matches is a regexp matching the format used by the kubernetes for
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// annotations. Following rules apply:
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//
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// - must start with FQDN - must contain at most one slash "/"
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// - must contain only lowercase letters, nubers, underscores,
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// hyphens, dots and slash
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matches, err := regexp.MatchString(`(?:[a-z0-9_-]+\.)+[a-z0-9_-]+/(?:[a-z0-9_-]+-)?$`, prefix)
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if err != nil {
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panic(err)
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}
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if !matches {
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return annotations{}, errors.New("subnet/kube: prefix must be in a format: fqdn/[0-9a-z-_]*")
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}
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a := annotations{
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SubnetKubeManaged: prefix + "kube-subnet-manager",
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BackendData: prefix + "backend-data",
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BackendType: prefix + "backend-type",
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BackendPublicIP: prefix + "public-ip",
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BackendPublicIPOverwrite: prefix + "public-ip-overwrite",
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}
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return a, nil
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}
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