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---
layout: default
class: Processor
title: -pluginpath* PARAMETERS
summary: Define JARs to be loaded in the local classloader for plugins.
---
Plugins not embedded in bndlib must load their classes from JARs or directories. Though these JARs can be specified on the `-plugin` instruction, it is also possible to specify them separate. The `-pluginpath` is a merged property so it is possible to specify clauses in multiple places, these will all be merged together.
/**
* Add the @link {@link Constants#PLUGINPATH} entries (which are file names)
* to the class loader. If this file does not exist, and there is a
* {@link Constants#PLUGINPATH_URL_ATTR} attribute then we download it first
* from that url. You can then also specify a
* {@link Constants#PLUGINPATH_SHA1_ATTR} attribute to verify the file.
*
* @see PLUGINPATH
* @param pluginPath
* the clauses for the plugin path
* @param loader
* The class loader to extend
*/
private void loadPluginPath(Set<Object> instances, String pluginPath, CL loader) {
Parameters pluginpath = new Parameters(pluginPath);
nextClause: for (Entry<String,Attrs> entry : pluginpath.entrySet()) {
File f = getFile(entry.getKey()).getAbsoluteFile();
if (!f.isFile()) {
//
// File does not exist! Check if we need to download
//
String url = entry.getValue().get(PLUGINPATH_URL_ATTR);
if (url != null) {
try {
trace("downloading %s to %s", url, f.getAbsoluteFile());
URL u = new URL(url);
URLConnection connection = u.openConnection();
//
// Allow the URLCOnnectionHandlers to interact with the
// connection so they can sign it or decorate it with
// a password etc.
//
for (Object plugin : instances) {
if (plugin instanceof URLConnectionHandler) {
URLConnectionHandler handler = (URLConnectionHandler) plugin;
if (handler.matches(u))
handler.handle(connection);
}
}
//
// Copy the url to the file
//
f.getParentFile().mkdirs();
IO.copy(connection.getInputStream(), f);
//
// If there is a sha specified, we verify the download
// of the
// the file.
//
String digest = entry.getValue().get(PLUGINPATH_SHA1_ATTR);
if (digest != null) {
if (Hex.isHex(digest.trim())) {
byte[] sha1 = Hex.toByteArray(digest);
byte[] filesha1 = SHA1.digest(f).digest();
if (!Arrays.equals(sha1, filesha1)) {
error("Plugin path: %s, specified url %s and a sha1 but the file does not match the sha",
entry.getKey(), url);
}
} else {
error("Plugin path: %s, specified url %s and a sha1 '%s' but this is not a hexadecimal",
entry.getKey(), url, digest);
}
}
}
catch (Exception e) {
error("Failed to download plugin %s from %s, error %s", entry.getKey(), url, e);
continue nextClause;
}
} else {
error("No such file %s from %s and no 'url' attribute on the path so it can be downloaded",
entry.getKey(), this);
continue nextClause;
}
}
trace("Adding %s to loader for plugins", f);
try {
loader.add(f.toURI().toURL());
}
catch (MalformedURLException e) {
// Cannot happen since every file has a correct url
}
}
}
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