Import DataURLStreamHandler from bndtools project and restore headers

bundles/org.eclipse.equinox.common/src/org/eclipse/core/internal/runtime/DataURLStreamHandler.java

@@ -0,0 +1,126 @@
+/*******************************************************************************
+ * Copyright (c) 2015, 2019 bndtools project and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Neil Bartlett <[email protected]> - initial API and implementation
+ *     BJ Hargrave <[email protected]> - ongoing enhancements
+ *******************************************************************************/
+package bndtools;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLConnection;
+import java.net.URLDecoder;
+import java.util.StringTokenizer;
+
+import org.osgi.service.url.AbstractURLStreamHandlerService;
+
+import aQute.lib.base64.Base64;
+
+/**
+ * Basic implementation of IETF RFC 2397, the "data" URL scheme
+ * (http://tools.ietf.org/html/rfc2397).
+ */
+public class DataURLStreamHandler extends AbstractURLStreamHandlerService {
+
+	public final static String PROTOCOL = "data";
+
+	@Override
+	public URLConnection openConnection(URL u) throws IOException {
+		if (!PROTOCOL.equals(u.getProtocol()))
+			throw new MalformedURLException("Unsupported protocol");
+		return new DataURLConnection(u);
+	}
+
+	static class ParseResult {
+		String	mediaType	= "text/plain";
+		String	charset		= "US-ASCII";
+		byte[]	data;
+	}
+
+	static final class DataURLConnection extends URLConnection {
+
+		private ParseResult parsed = null;
+
+		DataURLConnection(URL url) {
+			super(url);
+		}
+
+		@Override
+		public void connect() throws IOException {
+			parsed = parse(url.getPath());
+		}
+
+		static ParseResult parse(String ssp) throws IOException {
+			int commaIndex = ssp.indexOf(',');
+			if (commaIndex < 0)
+				throw new MalformedURLException("missing comma");
+
+			String paramSegment = ssp.substring(0, commaIndex);
+			String dataSegment = ssp.substring(commaIndex + 1);
+
+			String mediaType = null;
+			boolean base64 = false;
+			String charset = "US-ASCII";
+
+			StringTokenizer tokenizer = new StringTokenizer(paramSegment, ";");
+			boolean first = true;
+			while (tokenizer.hasMoreTokens()) {
+				String token = tokenizer.nextToken();
+				if (first)
+					mediaType = token;
+				else if ("base64".equals(token))
+					base64 = true;
+				else if (token.startsWith("charset="))
+					charset = token.substring("charset=".length());
+				first = false;
+			}
+
+			byte[] bytes;
+			if (base64) {
+				bytes = Base64.decodeBase64(dataSegment);
+			} else {
+				String decoded = URLDecoder.decode(dataSegment, charset);
+				bytes = decoded.getBytes("UTF-8");
+			}
+
+			ParseResult parsed = new ParseResult();
+			parsed.data = bytes;
+			if (mediaType != null && !mediaType.isEmpty())
+				parsed.mediaType = mediaType;
+			if (charset != null && !charset.isEmpty())
+				parsed.charset = charset;
+			return parsed;
+		}
+
+		@Override
+		public InputStream getInputStream() throws IOException {
+			if (parsed == null)
+				connect();
+
+			return new ByteArrayInputStream(parsed.data);
+		}
+
+		@Override
+		public String getContentType() {
+			return parsed != null ? parsed.mediaType : null;
+		}
+
+		@Override
+		public String getContentEncoding() {
+			return parsed != null ? parsed.charset : null;
+		}
+
+	}
+
+}