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import java.io.*;
import java.lang.reflect.*;
import java.math.*;
import java.net.*;
import java.nio.*;
import java.nio.file.*;
import java.security.*;
import java.util.*;
import java.util.stream.*;
import javax.tools.*;
import javax.xml.bind.annotation.adapters.HexBinaryAdapter;
/*
This file class allows bootstrapping out of Java into Scala.
It downloads the Scala jars for the version number given as the first
argument into the directory given as the second argument and returns
a classpath String.
*/
public class BootstrapScala{
public final static Dependency[] dependencies(String target, String scalaVersion){
return new Dependency[]{
Dependency.scala(target, scalaVersion, "library", "f75e7acabd57b213d6f61483240286c07213ec0e"),
Dependency.scala(target, scalaVersion, "compiler","1454c21d39a4d991006a2a47c164f675ea1dafaf"),
Dependency.scala(target, scalaVersion, "reflect", "bf1649c9d33da945dea502180855b56caf06288c"),
new Dependency(target, "modules/scala-xml_2.11/1.0.5", "scala-xml_2.11-1.0.5", "77ac9be4033768cf03cc04fbd1fc5e5711de2459")
};
}
public static void main(String args[]){
if(args.length < 2){
System.err.println("Usage: bootstrap_scala <scala version> <download directory>");
System.exit(1);
}
Dependency[] ds = dependencies( args[1], args[0] );
try {
new File(args[1]).mkdirs();
Arrays.stream(ds).forEach( d -> {
download( d.url, d.path, d.hash );
});
System.out.println(
String.join(
File.pathSeparator,
Arrays.stream(ds).map( d -> d.path.toString() ).toArray(String[]::new)
)
);
} catch (final Exception e) {
throw new RuntimeException(e);
}
}
public static void download(URL urlString, Path target, String sha1){
try {
final Path unverified = Paths.get(target+".unverified");
if(!Files.exists(target)){
new File(target.toString()).getParentFile().mkdirs();
System.err.println("downloading "+urlString);
System.err.println("to "+target);
InputStream stream = urlString.openStream();
Files.copy(stream, unverified, StandardCopyOption.REPLACE_EXISTING);
stream.close();
String checksum = sha1(Files.readAllBytes(unverified));
if(sha1 == null || sha1.toUpperCase().equals(checksum)){
Files.move(unverified, target, StandardCopyOption.REPLACE_EXISTING, StandardCopyOption.ATOMIC_MOVE);
} else {
System.err.println(target + " checksum does not match.\nExpected: |"+sha1+"|\nFound: |"+checksum+"|");
System.exit(1);
}
}
} catch (final Exception e) {
throw new RuntimeException(e);
}
}
public static String sha1(byte[] bytes){
try {
final MessageDigest sha1 = MessageDigest.getInstance("SHA1");
sha1.update( bytes, 0, bytes.length );
return (new HexBinaryAdapter()).marshal(sha1.digest());
} catch (final Exception e) {
throw new RuntimeException(e);
}
}
}
class Dependency{
URL url;
Path path;
String hash;
public Dependency(String target, String folder, String file, String hash){
path = Paths.get(target+file+".jar");
try { url = new URL("https://repo1.maven.org/maven2/org/scala-lang/"+folder+"/"+file+".jar"); }
catch (final MalformedURLException e) { throw new RuntimeException(e); }
hash = hash;
}
// scala-lang dependency
public static Dependency scala(String target, String scalaVersion, String scalaModule, String hash){
return new Dependency(
target,
"scala-"+scalaModule+"/"+scalaVersion,
"scala-"+scalaModule+"-"+scalaVersion,
hash
);
}
}
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