65 lines
1.7 KiB
Go
65 lines
1.7 KiB
Go
/*
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Copyright 2024 The Kubernetes Authors All rights reserved.
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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 update
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import (
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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)
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const dockerHubTagsURL = "https://hub.docker.com/v2/repositories/%s/tags?page_size=100"
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// Response is used to unmarshal the response from Docker Hub
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type Response struct {
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Results []struct {
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Name string `json:"name"`
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}
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}
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// ImageTagsFromDockerHub returns the 100 latest image tags from Docker Hub for the provided repository
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func ImageTagsFromDockerHub(repo string) ([]string, error) {
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resp, err := http.Get(fmt.Sprintf(dockerHubTagsURL, repo))
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if err != nil {
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return nil, fmt.Errorf("unable to get tags list: %v", err)
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}
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defer resp.Body.Close()
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("unable to read HTTP response from Docker Hub: %v", err)
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}
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var content Response
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err = json.Unmarshal(body, &content)
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if err != nil {
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return nil, fmt.Errorf("unable to unmarshal response from Docker Hub: %v", err)
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}
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versions := make([]string, len(content.Results))
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for i, tag := range content.Results {
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versions[i] = tag.Name
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}
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if len(versions) == 0 {
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return nil, fmt.Errorf("tag list is empty")
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}
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return versions, nil
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}
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