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package io.github.jshipit;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.node.ArrayNode;
import java.io.*;
import java.net.*;
import java.util.Scanner;
public class DockerAPIHelper {
private String apiToken;
private String apiRepo;
private String authURL;
private String repository;
private String image;
private String tag;
public DockerAPIHelper(String apiRepo, String authURL, String repository, String image, String tag) {
System.out.println("DockerAPIHelper constructor");
this.apiRepo = apiRepo;
this.repository = repository;
this.authURL = authURL;
this.image = image;
this.tag = tag;
try {
apiToken = generateAPIToken();
} catch (IOException | RuntimeException e) {
System.out.println("IOException | RuntimeException");
e.printStackTrace();
}
}
public String generateAPIToken() throws IOException, RuntimeException {
URL url_obj = null;
try {
url_obj = new URI(this.authURL + "?scope=repository:" + this.repository + "/" + this.image + ":pull" + "&service=" + this.apiRepo).toURL();
System.out.println(url_obj.toString());
} catch (URISyntaxException | MalformedURLException e) {
System.out.println("URISyntaxException | MalformedURLException");
e.printStackTrace();
}
assert url_obj != null;
HttpURLConnection con = (HttpURLConnection) url_obj.openConnection();
con.setRequestMethod("GET");
con.connect();
if (con.getResponseCode() != 200) {
System.out.println("Error: " + con.getResponseCode());
throw new RuntimeException("Failed : HTTP error code : "
+ con.getResponseCode());
} else {
System.out.println("Success: " + con.getResponseCode());
String output = "";
Scanner scanner = new Scanner(url_obj.openStream());
while (scanner.hasNext()) {
output += scanner.nextLine();
}
scanner.close();
System.out.println(output);
ObjectMapper mapper = new ObjectMapper();
JsonNode token = mapper.readTree(output);
System.out.println(token.get("token").asText());
return token.get("token").asText();
}
}
public JsonNode fetchManifestJson() throws IOException, RuntimeException {
URL url_obj = null;
try {
String repo = this.apiRepo.replace("registry", "registry-1");
url_obj = new URI("https://" + repo + "/v2/" + this.repository + "/" + this.image + "/manifests/"+this.tag).toURL();
System.out.println(url_obj.toString());
} catch(URISyntaxException | MalformedURLException e) {
System.out.println("URISyntaxException | MalformedURLException");
e.printStackTrace();
}
assert url_obj != null;
HttpURLConnection con = (HttpURLConnection) url_obj.openConnection();
con.setRequestMethod("GET");
con.setRequestProperty("Authorization", "Bearer " + this.apiToken);
con.setRequestProperty("Accept", "application/vnd.docker.distribution.manifest.v2+json");
con.connect();
if (con.getResponseCode() != 200) {
System.out.println("Error: " + con.getResponseCode());
throw new RuntimeException("Failed : HTTP error code : "
+ con.getResponseCode());
} else {
System.out.println("Success: " + con.getResponseCode());
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer content = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
content.append(inputLine);
}
in.close();
con.disconnect();
ObjectMapper mapper = new ObjectMapper();
JsonNode manifest = mapper.readTree(content.toString());
return manifest;
}
}
public void fetchBlob(String digest, String tmpdir) throws IOException, RuntimeException {
URL url_obj = null;
try {
String repo = this.apiRepo.replace("registry", "registry-1");
url_obj = new URI("https://" + repo + "/v2/" + this.repository + "/" + this.image + "/blobs/"+digest).toURL();
System.out.println(url_obj.toString());
} catch(URISyntaxException | MalformedURLException e) {
System.out.println("URISyntaxException | MalformedURLException");
e.printStackTrace();
}
assert url_obj != null;
HttpURLConnection con = (HttpURLConnection) url_obj.openConnection();
con.setRequestMethod("GET");
con.setRequestProperty("Authorization", "Bearer " + this.apiToken);
con.setRequestProperty("Accept", "application/vnd.docker.distribution.manifest.v2+json");
con.connect();
if (con.getResponseCode() != 200) {
System.out.println("Error: " + con.getResponseCode());
throw new RuntimeException("Failed : HTTP error code : "
+ con.getResponseCode());
} else {
System.out.println("Success: " + con.getResponseCode());
}
// Stream file download and output progress
InputStream inputStream = con.getInputStream();
FileOutputStream outputStream = new FileOutputStream(tmpdir+"/"+digest.replace("sha256:", "")+"layer.tar");
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
outputStream.close();
inputStream.close();
System.out.println("File downloaded successfully.");
}
public String getApiToken() {
return apiToken;
}
public String getImage() {
return image;
}
public String getTag() {
return tag;
}
}
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