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package cz.crcs.ectester.standalone.libs;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Field;
import java.net.URL;
import java.net.URLConnection;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.security.Provider;
/**
* @author Jan Jancar johny@neuromancer.sk
*/
public abstract class NativeECLibrary extends ProviderECLibrary {
private String resource;
private String[] requriements;
public static String LIB_RESOURCE_DIR = "/cz/crcs/ectester/standalone/libs/jni/";
public NativeECLibrary(String resource, String... requirements) {
this.resource = resource;
this.requriements = requirements;
}
@Override
public boolean initialize() {
try {
/* Determine what OS are we running on and use appropriate suffix and path. */
String suffix;
Path appData;
if (System.getProperty("os.name").startsWith("Windows")) {
suffix = "dll";
appData = Paths.get(System.getenv("AppData"));
} else {
suffix = "so";
if (System.getProperty("os.name").startsWith("Linux")) {
String dataHome = System.getenv("XDG_DATA_HOME");
if (dataHome != null) {
appData = Paths.get(dataHome);
} else {
appData = Paths.get(System.getProperty("user.home"), ".local", "share");
}
} else {
appData = Paths.get(System.getProperty("user.home"), ".local", "share");
}
}
/* Resolve and create the ECTester directories in appData. */
Path libDir = appData.resolve("ECTesterStandalone");
File libDirFile = libDir.toFile();
Path libReqDir = libDir.resolve("lib");
File libReqDirFile = libReqDir.toFile();
Path libPath = libDir.resolve(resource + "." + suffix);
/* Create directory for shims and for requirements. */
libDirFile.mkdirs();
libReqDirFile.mkdirs();
/* Write the shim. */
writeNewer(resource + "." + suffix, libPath);
/*
* Need to hack in /usr/local/lib to path.
* See: https://stackoverflow.com/questions/5419039/is-djava-library-path-equivalent-to-system-setpropertyjava-library-path/24988095#24988095
*/
String path = System.getProperty("java.library.path");
if (suffix.equals("so")) {
String newPath = path + ":/usr/local/lib";
System.setProperty("java.library.path", newPath);
Field fieldSysPath;
try {
fieldSysPath = ClassLoader.class.getDeclaredField("sys_paths");
fieldSysPath.setAccessible(true);
fieldSysPath.set(null, null);
} catch (NoSuchFieldException | IllegalAccessException ignored) {
}
}
/* Load the requirements, if they are bundled, write them in and load them. */
try {
for (String requirement : requriements) {
if (requirement.endsWith(suffix)) {
/* The requirement is bundled, write it */
Path reqPath = libReqDir.resolve(requirement);
writeNewer(requirement, reqPath);
System.load(reqPath.toString());
} else {
System.loadLibrary(requirement);
}
}
} catch (UnsatisfiedLinkError ule) {
return false;
} finally {
if (suffix.equals("so")) {
System.setProperty("java.library.path", path);
}
}
System.load(libPath.toString());
provider = createProvider();
return super.initialize();
} catch (IOException | UnsatisfiedLinkError ex) {
System.err.println(ex.getMessage());
}
return false;
}
private boolean isNewer(URLConnection jarConn, Path realPath) throws IOException {
if (realPath.toFile().isFile()) {
long jarModified = jarConn.getLastModified();
long realModified = Files.getLastModifiedTime(realPath).toMillis();
return jarModified > realModified;
}
return true;
}
private boolean writeNewer(String resource, Path outPath) throws IOException {
URL reqURL = NativeECLibrary.class.getResource(LIB_RESOURCE_DIR + resource);
if (reqURL == null) {
return false;
}
URLConnection reqConn = reqURL.openConnection();
if (isNewer(reqConn, outPath)) {
Files.copy(reqConn.getInputStream(), outPath, StandardCopyOption.REPLACE_EXISTING);
}
reqConn.getInputStream().close();
return true;
}
abstract Provider createProvider();
}
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