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import org.json.JSONArray;
import org.json.JSONObject;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URI;
import java.net.http.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.*;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
public class JavaUpdater {
record GitHubResult(Optional<String> latestVersion, Optional<String> next) {
}
record JsonInfo(String repo, String version, String hash) {
public JsonInfo(JSONObject json) {
this(json.getString("repo"), json.getString("version"), json.getString("hash"));
}
public String toJsonString(String featureVersion) {
return """
\s "%s": {
\s "version": "%s",
\s "repo": "%s",
\s "hash": "%s"
\s }\
""".formatted(featureVersion, version, repo, hash);
}
}
// Parses the GitHub Link header
public static Optional<String> getNextLink(HttpHeaders headers) {
var linkHeader = headers.map().get("Link");
if (linkHeader == null || linkHeader.isEmpty()) return null;
var links = linkHeader.getFirst();
var linksRegex = Pattern.compile("<(.+)>;\\s*rel=\"next\"");
return Pattern.compile(",")
.splitAsStream(links)
.map(x -> linksRegex.matcher(x).results()
.map(g -> g.group(1))
.findFirst()
)
.filter(Optional::isPresent)
.map(Optional::orElseThrow)
.findFirst();
}
// HTTP request helper, sets GITHUB_TOKEN if present
private static HttpRequest NewGithubRequest(String url) {
var token = System.getenv().get("GITHUB_TOKEN");
var builder = HttpRequest.newBuilder()
.uri(URI.create(url));
if (token != null)
builder.setHeader("Authorization", "Bearer " + token);
return builder.build();
}
private static GitHubResult getLatestTag(String url) {
var request = NewGithubRequest(url);
var response =
HttpClient.newHttpClient().sendAsync(request, HttpResponse.BodyHandlers.ofString())
.join();
var json = new JSONArray(response.body());
Optional<String> version = StreamSupport.stream(json.spliterator(), false)
.map(JSONObject.class::cast)
.map(x -> x.getString("name").replaceFirst("jdk-", ""))
.filter(x -> x.contains("-ga"))
.max(Comparator.comparing(Runtime.Version::parse));
return new GitHubResult(version, getNextLink(response.headers()));
}
public String findNewerVersion() {
var url = Optional.of("https://api.github.com/repos/openjdk/" + getRepo() + "/tags?per_page=100");
String version = getCurrentVersion();
do {
GitHubResult response = getLatestTag(url.orElseThrow());
if (response.latestVersion.isPresent() && response.latestVersion.orElseThrow().equals(version)) {
return null;
}
String latestVersion = Stream.of(version, response.latestVersion.orElse(version))
.max(Comparator.comparing(Runtime.Version::parse)).orElseThrow();
if (latestVersion != version)
return latestVersion;
url = response.next;
} while (url.isPresent());
return null;
}
private static String prettyPrint(JSONObject json) {
Iterable<String> iterable = () -> json.keys();
return StreamSupport
.stream(iterable.spliterator(), false)
.sorted(Comparator.reverseOrder())
.map(majorVersion -> (new JsonInfo(json.getJSONObject(majorVersion))).toJsonString(majorVersion))
.collect(
Collectors.joining(",\n", "{\n", "\n}")
);
}
public void updateJsonInfo(String newVersion) {
try {
JSONObject json = getJsonInfo();
var info = json.getJSONObject(featureNumber);
info.put("version", newVersion);
info.put("hash", nixHash(newVersion));
try (PrintWriter out = new PrintWriter(infoJsonPath)) {
out.println(prettyPrint(json));
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private String nixHash(String version) {
try {
var process = new ProcessBuilder("nix", "flake", "prefetch",
"--extra-experimental-features", "'nix-command flakes'",
"--json", "github:openjdk/" + getRepo() + "/jdk-" + version).start();
var json = new JSONObject(new String(process.getInputStream().readAllBytes()));
process.waitFor();
return json.getString("hash");
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private final String featureNumber;
private final String infoJsonPath;
private final JSONObject jsonInfo;
public String getCurrentVersion() {
return this.jsonInfo.getJSONObject(this.featureNumber).getString("version");
}
public String getRepo() {
return this.jsonInfo.getJSONObject(this.featureNumber).getString("repo");
}
public JSONObject getJsonInfo() {
try {
String infoStr = Files.readString(Path.of(this.infoJsonPath));
return new JSONObject(infoStr);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public JavaUpdater(String featureNumber, String infoJsonPath) {
this.featureNumber = featureNumber;
this.infoJsonPath = infoJsonPath;
this.jsonInfo = getJsonInfo();
}
public static void main(String[] args) {
var updater = new JavaUpdater(args[0], args[1]);
String newerVersion = updater.findNewerVersion();
if (newerVersion != null) {
updater.updateJsonInfo(newerVersion);
}
}
}
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