1  package main
 2  
 3  import (
 4  	"context"
 5  	"encoding/json"
 6  	"fmt"
 7  	"io"
 8  	"log"
 9  	"net/http"
10  
11  	"github.com/docker/docker/client"
12  )
13  
14  func getCurrentHash(ctx context.Context, cli *client.Client, imageName string) (string, string, string) {
15  	image, _, err := cli.ImageInspectWithRaw(ctx, imageName)
16  	if err != nil {
17  		log.Printf("Error inspecting image %s: %v", imageName, err)
18  		return "", "", ""
19  	}
20  	// TODO: loop over repodigests if more than one and compare with latestHash
21  	return image.RepoDigests[0], image.Architecture, image.Created
22  }
23  
24  func getLatestHash(namespace, repository, tag, arch string) (string, error) {
25  	url := fmt.Sprintf("https://hub.docker.com/v2/namespaces/%s/repositories/%s/tags/%s", namespace, repository, tag)
26  	resp, err := http.Get(url)
27  	if err != nil {
28  		return "", err
29  	}
30  	defer resp.Body.Close()
31  
32  	log.Printf("checking on dockerhub: %s", url)
33  
34  	if resp.StatusCode != http.StatusOK {
35  		return "", fmt.Errorf("failed to fetch data: %s", resp.Status)
36  	}
37  
38  	body, err := io.ReadAll(resp.Body)
39  	if err != nil {
40  		return "", err
41  	}
42  
43  	var repo Repository
44  	err = json.Unmarshal(body, &repo)
45  	if err != nil {
46  		return "", err
47  	}
48  
49  	if repo.Digest == "" {
50  		for _, image := range repo.Images {
51  			if image.Architecture == arch {
52  				return image.Digest, nil
53  			}
54  		}
55  	}
56  
57  	return repo.Digest, nil
58  
59  	// return "", fmt.Errorf("no images found for architecture: %s", architecture)
60  }
61  
62  func pingDockerhub(namespace, repository, tag string) (int, error) {
63  	url := fmt.Sprintf("https://hub.docker.com/v2/namespaces/%s/repositories/%s/tags/%s", namespace, repository, tag)
64  	resp, err := http.Get(url)
65  	if err != nil {
66  		return 0, err
67  	}
68  	defer resp.Body.Close()
69  
70  	if resp.StatusCode == http.StatusNotFound {
71  		return resp.StatusCode, nil
72  	}
73  
74  	return 0, nil
75  }