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main.go
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main.go
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package main
import (
"fmt"
"io"
"net/http"
"os"
"path/filepath"
"regexp"
"strings"
"github.com/joshuatcasey/collections"
"github.com/joshuatcasey/libdependency/retrieve"
"github.com/joshuatcasey/libdependency/upstream"
"github.com/joshuatcasey/libdependency/versionology"
"github.com/paketo-buildpacks/packit/v2/cargo"
"github.com/paketo-buildpacks/packit/v2/fs"
"golang.org/x/exp/slices"
)
type StackAndTargetPair struct {
stacks []string
target string
}
var supportedStacks = []StackAndTargetPair{
{stacks: []string{"io.buildpacks.stacks.jammy"}, target: "jammy"},
{stacks: []string{"io.buildpacks.stacks.bionic"}, target: "bionic"},
{stacks: []string{"*"}, target: "NONE"},
}
func getAsString(url string) (string, error) {
response, err := http.DefaultClient.Get(url)
if err != nil {
return "", fmt.Errorf("could not get project metadata: %w", err)
}
if err != nil {
return "", err
}
defer response.Body.Close()
body, err := io.ReadAll(response.Body)
if err != nil {
return "", fmt.Errorf("could not read response: %w", err)
}
return string(body), nil
}
func getAllVersions() (versionology.VersionFetcherArray, error) {
body, err := getAsString("https://www.python.org/downloads/")
if err != nil {
return nil, fmt.Errorf("could not retrieve new versions from upstream: %w", err)
}
re := regexp.MustCompile(`release-number.*Python ([\d]+\.[\d]+\.[\d]+)`)
var versions []string
for _, line := range strings.Split(body, "\n") {
matches := re.FindStringSubmatch(line)
if len(matches) == 2 {
versions = append(versions, matches[1])
}
}
return versionology.NewSimpleVersionFetcherArray(versions...)
}
func generateMetadata(versionFetcher versionology.VersionFetcher) ([]versionology.Dependency, error) {
version := versionFetcher.Version().String()
sourceURL := fmt.Sprintf("https://www.python.org/ftp/python/%[1]s/Python-%[1]s.tgz", version)
sourceSHA256, err := getSha256(sourceURL, version)
if err != nil {
return nil, err
}
configMetadataDependency := cargo.ConfigMetadataDependency{
CPE: fmt.Sprintf("cpe:2.3:a:python:python:%s:*:*:*:*:*:*:*", version),
ID: "python",
Licenses: retrieve.LookupLicenses(sourceURL, upstream.DefaultDecompress),
Name: "Python",
PURL: retrieve.GeneratePURL("python", version, sourceSHA256, sourceURL),
Source: sourceURL,
SourceChecksum: fmt.Sprintf("sha256:%s", sourceSHA256),
Version: version,
}
return collections.TransformFuncWithError(supportedStacks, func(pair StackAndTargetPair) (versionology.Dependency, error) {
configMetadataDependency.Stacks = pair.stacks
if slices.Contains(pair.stacks, "*") {
configMetadataDependency.Checksum = configMetadataDependency.SourceChecksum
configMetadataDependency.URI = configMetadataDependency.Source
}
return versionology.NewDependency(configMetadataDependency, pair.target)
})
}
func getSha256(sourceURL string, version string) (string, error) {
resp, err := http.Get(sourceURL)
if err != nil {
return "", fmt.Errorf("failed to query url: %w", err)
}
if resp.StatusCode != http.StatusOK {
return "", fmt.Errorf("failed to query url %s with: status code %d", sourceURL, resp.StatusCode)
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return "", err
}
tempDir, err := os.MkdirTemp("", "python")
if err != nil {
return "", err
}
defer os.RemoveAll(tempDir)
tarballPath := filepath.Join(tempDir, fmt.Sprintf("python-%s.tgz", version))
err = os.WriteFile(tarballPath, body, os.ModePerm)
if err != nil {
return "", err
}
calculator := fs.NewChecksumCalculator()
return calculator.Sum(tarballPath)
}
func main() {
retrieve.NewMetadata("python", getAllVersions, generateMetadata)
}