71 lines
2.5 KiB
Go
71 lines
2.5 KiB
Go
/*
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Copyright 2016 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 util
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import (
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"fmt"
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"io/ioutil"
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"net/http"
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"regexp"
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"strings"
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)
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var (
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kubeReleaseBucketURL = "https://storage.googleapis.com/kubernetes-release/release"
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kubeReleaseRegex = regexp.MustCompile(`^v(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)([-0-9a-zA-Z_\.+]*)?$`)
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kubeReleaseLabelRegex = regexp.MustCompile(`^[[:lower:]]+(-[-\w_\.]+)?$`)
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)
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// KubernetesReleaseVersion is helper function that can fetch
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// available version information from release servers based on
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// label names, like "stable" or "latest".
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//
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// If argument is already semantic version string, it
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// will return same string.
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//
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// In case of labels, it tries to fetch from release
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// servers and then return actual semantic version.
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//
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// Available names on release servers:
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// stable (latest stable release)
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// stable-1 (latest stable release in 1.x)
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// stable-1.0 (and similarly 1.1, 1.2, 1.3, ...)
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// latest (latest release, including alpha/beta)
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// latest-1 (latest release in 1.x, including alpha/beta)
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// latest-1.0 (and similarly 1.1, 1.2, 1.3, ...)
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func KubernetesReleaseVersion(version string) (string, error) {
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if kubeReleaseRegex.MatchString(version) {
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return version, nil
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} else if kubeReleaseLabelRegex.MatchString(version) {
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url := fmt.Sprintf("%s/%s.txt", kubeReleaseBucketURL, version)
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resp, err := http.Get(url)
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if err != nil {
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return "", fmt.Errorf("unable to get URL %q: %s", url, err.Error())
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return "", fmt.Errorf("unable to fetch release information. URL: %q Status: %v", url, resp.Status)
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}
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return "", fmt.Errorf("unable to read content of URL %q: %s", url, err.Error())
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}
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// Re-validate received version and return.
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return KubernetesReleaseVersion(strings.Trim(string(body), " \t\n"))
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}
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return "", fmt.Errorf("version %q doesn't match patterns for neither semantic version nor labels (stable, latest, ...)", version)
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}
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