Metacat

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

				// download certificate with the public key on this server

				// and import it as a trusted certificate

				String certURL = ((String[]) params.get("certificate"))[0];

				if (certURL != null && !certURL.equals("")) {

					downloadCertificate(certURL);

				}

	// download certificate with the public key from certURL and

	// upload it onto this server; it then must be imported as a

	// trusted certificate

	private static void downloadCertificate(String certURL) throws FileNotFoundException,

			IOException, MalformedURLException, PropertyNotFoundException {

		// the path to be uploaded to

		String certPath = SystemUtil.getContextDir();

		// get filename from the URL of the certificate

		String filename = certURL;

		int slash = Math.max(filename.lastIndexOf('/'), filename.lastIndexOf('\\'));

		if (slash > -1) {

			filename = filename.substring(slash + 1);

		}

		// open file output strem to write the input into it

		File f = new File(certPath, filename);

		synchronized (f) {

			try {

				if (f.exists()) {

					throw new IOException("File already exist: " + f.getCanonicalFile());

					// if ( f.exists() && !f.canWrite() ) {

					// throw new IOException("Not writable: " +

					// f.getCanonicalFile());

				}

			} catch (SecurityException se) {

				// if a security manager exists,

				// its checkRead method is called for f.exist()

				// or checkWrite method is called for f.canWrite()

				throw se;

			}

			// create a buffered byte output stream

			// that uses a default-sized output buffer

			FileOutputStream fos = new FileOutputStream(f);

			BufferedOutputStream out = new BufferedOutputStream(fos);

			// this should be http url

			URL url = new URL(certURL);

			BufferedInputStream bis = null;

			try {

				bis = new BufferedInputStream(url.openStream());

				byte[] buf = new byte[4 * 1024]; // 4K buffer

				int b = bis.read(buf);

				while (b != -1) {

					out.write(buf, 0, b);

					b = bis.read(buf);

				}

			} finally {

				if (bis != null)

					bis.close();

			}

			// the input and the output streams must be closed

			bis.close();

			out.flush();

			out.close();

			fos.close();

		} // end of synchronized(f)

	}