/**
* Send a partial content response with the given range. If there are no satisfiable ranges, or if
* multiple ranges are requested, which is unsupported, respond with range not satisfiable.
*
* @param in stream to read from
* @param out stream to write to
* @param response http response to use
* @param contentLength for the response header
* @param ranges to write to respond with
* @throws IOException on error sending the response
*/
static void sendPartialData(
FSInputStream in,
OutputStream out,
HttpServletResponse response,
long contentLength,
List<InclusiveByteRange> ranges)
throws IOException {
if (ranges == null || ranges.size() != 1) {
response.setContentLength(0);
response.setStatus(HttpServletResponse.SC_REQUESTED_RANGE_NOT_SATISFIABLE);
response.setHeader("Content-Range", InclusiveByteRange.to416HeaderRangeString(contentLength));
} else {
InclusiveByteRange singleSatisfiableRange = ranges.get(0);
long singleLength = singleSatisfiableRange.getSize(contentLength);
response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT);
response.setHeader(
"Content-Range", singleSatisfiableRange.toHeaderRangeString(contentLength));
copyFromOffset(in, out, singleSatisfiableRange.getFirst(contentLength), singleLength);
}
}
@SuppressWarnings("unchecked")
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
final String path = ServletUtil.getDecodedPath(request, "/streamFile");
final String rawPath = ServletUtil.getRawPath(request, "/streamFile");
final String filename = JspHelper.validatePath(path);
final String rawFilename = JspHelper.validatePath(rawPath);
if (filename == null) {
response.setContentType("text/plain");
PrintWriter out = response.getWriter();
out.print("Invalid input");
return;
}
Enumeration<String> reqRanges = request.getHeaders("Range");
if (reqRanges != null && !reqRanges.hasMoreElements()) {
reqRanges = null;
}
DFSClient dfs;
try {
dfs = getDFSClient(request);
} catch (InterruptedException e) {
response.sendError(400, e.getMessage());
return;
}
DFSInputStream in = null;
OutputStream out = null;
try {
in = dfs.open(filename);
out = response.getOutputStream();
final long fileLen = in.getFileLength();
if (reqRanges != null) {
List<InclusiveByteRange> ranges = InclusiveByteRange.satisfiableRanges(reqRanges, fileLen);
StreamFile.sendPartialData(in, out, response, fileLen, ranges);
} else {
// No ranges, so send entire file
response.setHeader("Content-Disposition", "attachment; filename=\"" + rawFilename + "\"");
response.setContentType("application/octet-stream");
response.setHeader(CONTENT_LENGTH, "" + fileLen);
StreamFile.copyFromOffset(in, out, 0L, fileLen);
}
in.close();
in = null;
out.close();
out = null;
dfs.close();
dfs = null;
} catch (IOException ioe) {
if (LOG.isDebugEnabled()) {
LOG.debug("response.isCommitted()=" + response.isCommitted(), ioe);
}
throw ioe;
} finally {
IOUtils.cleanup(LOG, in);
IOUtils.cleanup(LOG, out);
IOUtils.cleanup(LOG, dfs);
}
}