package org.witness.informacam.app.utils;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.URLEncoder;
import java.util.Enumeration;
import java.util.Properties;
import java.util.StringTokenizer;
import android.net.Uri;
import android.util.Log;
/**
* This is simple HTTP local server for streaming InputStream to apps which are capable to read data from url.
* Random access input stream is optionally supported, depending if file can be opened in this mode.
*
* from: http://stackoverflow.com/a/9096241
*/
public class StreamOverHttp{
private static boolean debug = false;
private final File file;
private final String fileMimeType;
private long fileSize;
private InputStream fileInputStream;
private final ServerSocket serverSocket;
private Thread mainThread;
/**
* Some HTTP response status codes
*/
private static final String
HTTP_BADREQUEST = "400 Bad Request",
HTTP_416 = "416 Range not satisfiable",
HTTP_INTERNALERROR = "500 Internal Server Error";
public StreamOverHttp(File f, String forceMimeType, long forceFileSize, InputStream fis, int serverPort) throws IOException{
file = f;
fileMimeType = forceMimeType;
serverSocket = new ServerSocket(serverPort);
fileSize = forceFileSize;
fileInputStream = fis;
if (debug)
log ("streaming " + f.getAbsolutePath() + " type=" + fileMimeType + " len=" + fileSize);
mainThread = new Thread(new Runnable(){
@Override
public void run(){
try{
while(true) {
Socket accept = serverSocket.accept();
new HttpSession(accept);
}
}catch(IOException e){
log("socket closed: "+e);
}
}
});
mainThread.setName("Stream over HTTP");
mainThread.setDaemon(true);
mainThread.start();
}
private class HttpSession implements Runnable{
private boolean canSeek;
private InputStream is;
private final Socket socket;
HttpSession(Socket s){
socket = s;
log("Stream over localhost: serving request on "+s.getInetAddress());
Thread t = new Thread(this, "Http response");
t.setDaemon(true);
t.start();
}
@Override
public void run(){
try{
openInputStream();
handleResponse(socket);
}catch(IOException e){
e.printStackTrace();
}finally {
if(is!=null) {
try{
is.close();
}catch(IOException e){
e.printStackTrace();
}
}
}
}
private void openInputStream() throws IOException{
// openRandomAccessInputStream must return RandomAccessInputStream if file is ssekable, null otherwise
is = openRandomAccessInputStream(file);
if(is!=null)
canSeek = true;
else
is = openInputStream(file, 0);
}
public InputStream openInputStream (File file, int value) throws IOException
{
return fileInputStream;
}
public RandomAccessInputStream openRandomAccessInputStream (File file) throws IOException
{
if (fileInputStream instanceof info.guardianproject.iocipher.FileInputStream)
fileInputStream = new info.guardianproject.iocipher.FileInputStream(file.getAbsolutePath());
else
fileInputStream = new java.io.FileInputStream(file);
RandomAccessInputStream rais = new RandomAccessInputStream ()
{
@Override
public int available() throws IOException {
return fileInputStream.available();
}
@Override
public void close() throws IOException {
fileInputStream.close();
}
@Override
public void mark(int readlimit) {
fileInputStream.mark(readlimit);
}
@Override
public boolean markSupported() {
return fileInputStream.markSupported();
}
@Override
public int read(byte[] buffer, int byteOffset, int byteCount)
throws IOException {
return fileInputStream.read(buffer, byteOffset, byteCount);
}
@Override
public int read(byte[] buffer) throws IOException {
return fileInputStream.read(buffer);
}
@Override
public synchronized void reset() throws IOException {
fileInputStream.reset();
}
@Override
long length() {
return fileSize;
}
@Override
void seek(long offset) throws IOException {
fileInputStream.skip(offset);
}
};
return rais;
}
private void handleResponse(Socket socket){
try{
InputStream inS = socket.getInputStream();
if(inS == null)
return;
byte[] buf = new byte[8192];
int rlen = inS.read(buf, 0, buf.length);
if(rlen <= 0)
return;
// Create a BufferedReader for parsing the header.
ByteArrayInputStream hbis = new ByteArrayInputStream(buf, 0, rlen);
BufferedReader hin = new BufferedReader(new InputStreamReader(hbis));
Properties pre = new Properties();
// Decode the header into params and header java properties
if(!decodeHeader(socket, hin, pre))
return;
String range = pre.getProperty("range");
Properties headers = new Properties();
if(fileSize!=-1)
headers.put("Content-Length", String.valueOf(fileSize));
headers.put("Accept-Ranges", canSeek ? "bytes" : "none");
int sendCount;
String status;
if(range==null || !canSeek) {
status = "200 OK";
sendCount = (int)fileSize;
}else {
if(!range.startsWith("bytes=")){
sendError(socket, HTTP_416, null);
return;
}
if(debug)
log(range);
range = range.substring(6);
long startFrom = 0, endAt = -1;
int minus = range.indexOf('-');
if(minus > 0){
try{
String startR = range.substring(0, minus);
startFrom = Long.parseLong(startR);
String endR = range.substring(minus + 1);
endAt = Long.parseLong(endR);
}catch(NumberFormatException nfe){
}
}
if(startFrom >= fileSize){
sendError(socket, HTTP_416, null);
inS.close();
return;
}
if(endAt < 0)
endAt = fileSize - 1;
sendCount = (int)(endAt - startFrom + 1);
if(sendCount < 0)
sendCount = 0;
status = "206 Partial Content";
((RandomAccessInputStream)is).seek(startFrom);
headers.put("Content-Length", "" + sendCount);
String rangeSpec = "bytes " + startFrom + "-" + endAt + "/" + fileSize;
headers.put("Content-Range", rangeSpec);
}
sendResponse(socket, status, fileMimeType, headers, is, sendCount, buf, null);
inS.close();
if(debug)
log("Http stream finished");
}catch(IOException ioe){
if(debug)
ioe.printStackTrace();
try{
sendError(socket, HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());
}catch(Throwable t){
}
}catch(InterruptedException ie){
// thrown by sendError, ignore and exit the thread
if(debug)
ie.printStackTrace();
}
}
private boolean decodeHeader(Socket socket, BufferedReader in, Properties pre) throws InterruptedException{
try{
// Read the request line
String inLine = in.readLine();
if(inLine == null)
return false;
StringTokenizer st = new StringTokenizer(inLine);
if(!st.hasMoreTokens())
sendError(socket, HTTP_BADREQUEST, "Syntax error");
String method = st.nextToken();
if(!method.equals("GET"))
return false;
if(!st.hasMoreTokens())
sendError(socket, HTTP_BADREQUEST, "Missing URI");
while(true) {
String line = in.readLine();
if(line==null)
break;
// if(debug && line.length()>0) log(line);
int p = line.indexOf(':');
if(p<0)
continue;
final String atr = line.substring(0, p).trim().toLowerCase();
final String val = line.substring(p + 1).trim();
pre.put(atr, val);
if (debug)
log ("header=" + atr + ": " + val);
}
}catch(IOException ioe){
sendError(socket, HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());
}
return true;
}
}
/**
* @param fileName is display name appended to Uri, not really used (may be null), but client may display it as file name.
* @return Uri where this stream listens and servers.
*/
public Uri getUri(String fileName){
int port = serverSocket.getLocalPort();
String url = "http://localhost:"+port;
if(fileName!=null)
url += '/'+URLEncoder.encode(fileName);
return Uri.parse(url);
}
public void close(){
log("Closing stream over http");
try{
serverSocket.close();
mainThread.join();
}catch(Exception e){
e.printStackTrace();
}
}
/**
* Returns an error message as a HTTP response and
* throws InterruptedException to stop further request processing.
*/
private static void sendError(Socket socket, String status, String msg) throws InterruptedException{
sendResponse(socket, status, "text/plain", null, null, 0, null, msg);
throw new InterruptedException();
}
private static void copyStream(InputStream in, OutputStream out, byte[] tmpBuf, long maxSize) throws IOException{
while(maxSize>0){
int count = (int)Math.min(maxSize, tmpBuf.length);
count = in.read(tmpBuf, 0, count);
if(count<0)
break;
out.write(tmpBuf, 0, count);
maxSize -= count;
}
}
/**
* Sends given response to the socket, and closes the socket.
*/
private static void sendResponse(Socket socket, String status, String mimeType, Properties header, InputStream isInput, int sendCount, byte[] buf, String errMsg){
try{
OutputStream out = socket.getOutputStream();
PrintWriter pw = new PrintWriter(out);
{
String retLine = "HTTP/1.0 " + status + " \r\n";
pw.print(retLine);
}
if(mimeType!=null) {
String mT = "Content-Type: " + mimeType + "\r\n";
pw.print(mT);
}
if(header != null){
Enumeration<?> e = header.keys();
while(e.hasMoreElements()){
String key = (String)e.nextElement();
String value = header.getProperty(key);
String l = key + ": " + value + "\r\n";
if(debug) log(l);
pw.print(l);
}
}
pw.print("\r\n");
pw.flush();
if(isInput!=null)
copyStream(isInput, out, buf, sendCount);
else if(errMsg!=null) {
pw.print(errMsg);
pw.flush();
}
out.flush();
out.close();
}catch(IOException e){
if(debug)
log(e.getMessage());
}finally {
try{
socket.close();
}catch(Throwable t){
}
}
}
private final static void log (String msg)
{
if (debug)
Log.d("StreamProxy",msg);
}
}
/**
* Seekable InputStream.
* Abstract, you must add implementation for your purpose.
*/
abstract class RandomAccessInputStream extends InputStream{
/**
* @return total length of stream (file)
*/
abstract long length();
/**
* Seek within stream for next read-ing.
*/
abstract void seek(long offset) throws IOException;
@Override
public int read() throws IOException{
byte[] b = new byte[1];
read(b);
return b[0]&0xff;
}
}