HttpUrlSource.java
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package com.danikula.videocache;
import android.text.TextUtils;
import com.danikula.videocache.headers.EmptyHeadersInjector;
import com.danikula.videocache.headers.HeaderInjector;
import com.danikula.videocache.sourcestorage.SourceInfoStorage;
import com.danikula.videocache.sourcestorage.SourceInfoStorageFactory;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InterruptedIOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Map;
import static com.danikula.videocache.Preconditions.checkNotNull;
import static com.danikula.videocache.ProxyCacheUtils.DEFAULT_BUFFER_SIZE;
import static java.net.HttpURLConnection.HTTP_MOVED_PERM;
import static java.net.HttpURLConnection.HTTP_MOVED_TEMP;
import static java.net.HttpURLConnection.HTTP_OK;
import static java.net.HttpURLConnection.HTTP_PARTIAL;
import static java.net.HttpURLConnection.HTTP_SEE_OTHER;
/**
* {@link Source} that uses http resource as source for {@link ProxyCache}.
*
* @author Alexey Danilov (danikula@gmail.com).
*/
public class HttpUrlSource implements Source {
private static final int MAX_REDIRECTS = 5;
private final SourceInfoStorage sourceInfoStorage;
private final HeaderInjector headerInjector;
private SourceInfo sourceInfo;
private HttpURLConnection connection;
private InputStream inputStream;
public HttpUrlSource(String url) {
this(url, SourceInfoStorageFactory.newEmptySourceInfoStorage());
}
public HttpUrlSource(String url, SourceInfoStorage sourceInfoStorage) {
this(url, sourceInfoStorage, new EmptyHeadersInjector());
}
public HttpUrlSource(String url, SourceInfoStorage sourceInfoStorage, HeaderInjector headerInjector) {
this.sourceInfoStorage = checkNotNull(sourceInfoStorage);
this.headerInjector = checkNotNull(headerInjector);
SourceInfo sourceInfo = sourceInfoStorage.get(url);
this.sourceInfo = sourceInfo != null ? sourceInfo :
new SourceInfo(url, Integer.MIN_VALUE, ProxyCacheUtils.getSupposablyMime(url));
}
public HttpUrlSource(HttpUrlSource source) {
this.sourceInfo = source.sourceInfo;
this.sourceInfoStorage = source.sourceInfoStorage;
this.headerInjector = source.headerInjector;
}
@Override
public synchronized long length() throws ProxyCacheException {
if (sourceInfo.length == Integer.MIN_VALUE) {
fetchContentInfo();
}
return sourceInfo.length;
}
@Override
public void open(long offset) throws ProxyCacheException {
try {
connection = openConnection(offset, -1);
String mime = connection.getContentType();
inputStream = new BufferedInputStream(connection.getInputStream(), DEFAULT_BUFFER_SIZE);
long length = readSourceAvailableBytes(connection, offset, connection.getResponseCode());
this.sourceInfo = new SourceInfo(sourceInfo.url, length, mime);
this.sourceInfoStorage.put(sourceInfo.url, sourceInfo);
} catch (IOException e) {
throw new ProxyCacheException("Error opening connection for " + sourceInfo.url + " with offset " + offset, e);
}
}
private long readSourceAvailableBytes(HttpURLConnection connection, long offset, int responseCode) throws IOException {
long contentLength = getContentLength(connection);
return responseCode == HTTP_OK ? contentLength
: responseCode == HTTP_PARTIAL ? contentLength + offset : sourceInfo.length;
}
private long getContentLength(HttpURLConnection connection) {
String contentLengthValue = connection.getHeaderField("Content-Length");
return contentLengthValue == null ? -1 : Long.parseLong(contentLengthValue);
}
@Override
public void close() throws ProxyCacheException {
if (connection != null) {
try {
connection.disconnect();
} catch (NullPointerException | IllegalArgumentException e) {
String message = "Wait... but why? WTF!? " +
"Really shouldn't happen any more after fixing https://github.com/danikula/AndroidVideoCache/issues/43. " +
"If you read it on your device log, please, notify me danikula@gmail.com or create issue here " +
"https://github.com/danikula/AndroidVideoCache/issues.";
throw new RuntimeException(message, e);
} catch (ArrayIndexOutOfBoundsException e) {
Logger.error("Error closing connection correctly. Should happen only on Android L. " +
"If anybody know how to fix it, please visit https://github.com/danikula/AndroidVideoCache/issues/88. " +
"Until good solution is not know, just ignore this issue.");
}
}
}
@Override
public int read(byte[] buffer) throws ProxyCacheException {
if (inputStream == null) {
throw new ProxyCacheException("Error reading data from " + sourceInfo.url + ": connection is absent!");
}
try {
return inputStream.read(buffer, 0, buffer.length);
} catch (InterruptedIOException e) {
throw new InterruptedProxyCacheException("Reading source " + sourceInfo.url + " is interrupted", e);
} catch (IOException e) {
throw new ProxyCacheException("Error reading data from " + sourceInfo.url, e);
}
}
private void fetchContentInfo() throws ProxyCacheException {
Logger.debug("Read content info from " + sourceInfo.url);
HttpURLConnection urlConnection = null;
InputStream inputStream = null;
try {
urlConnection = openConnection(0, 10000);
long length = getContentLength(urlConnection);
String mime = urlConnection.getContentType();
inputStream = urlConnection.getInputStream();
this.sourceInfo = new SourceInfo(sourceInfo.url, length, mime);
this.sourceInfoStorage.put(sourceInfo.url, sourceInfo);
Logger.debug("Source info fetched: " + sourceInfo);
} catch (IOException e) {
Logger.error("Error fetching info from " + sourceInfo.url);
} finally {
ProxyCacheUtils.close(inputStream);
if (urlConnection != null) {
urlConnection.disconnect();
}
}
}
private HttpURLConnection openConnection(long offset, int timeout) throws IOException, ProxyCacheException {
HttpURLConnection connection;
boolean redirected;
int redirectCount = 0;
String url = this.sourceInfo.url;
do {
Logger.debug("Open connection " + (offset > 0 ? " with offset " + offset : "") + " to " + url);
connection = (HttpURLConnection) new URL(url).openConnection();
injectCustomHeaders(connection, url);
if (offset > 0) {
connection.setRequestProperty("Range", "bytes=" + offset + "-");
}
if (timeout > 0) {
connection.setConnectTimeout(timeout);
connection.setReadTimeout(timeout);
}
int code = connection.getResponseCode();
redirected = code == HTTP_MOVED_PERM || code == HTTP_MOVED_TEMP || code == HTTP_SEE_OTHER;
if (redirected) {
url = connection.getHeaderField("Location");
redirectCount++;
connection.disconnect();
}
if (redirectCount > MAX_REDIRECTS) {
throw new ProxyCacheException("Too many redirects: " + redirectCount);
}
} while (redirected);
return connection;
}
private void injectCustomHeaders(HttpURLConnection connection, String url) {
Map<String, String> extraHeaders = headerInjector.addHeaders(url);
for (Map.Entry<String, String> header : extraHeaders.entrySet()) {
connection.setRequestProperty(header.getKey(), header.getValue());
}
}
public synchronized String getMime() throws ProxyCacheException {
if (TextUtils.isEmpty(sourceInfo.mime)) {
fetchContentInfo();
}
return sourceInfo.mime;
}
public String getUrl() {
return sourceInfo.url;
}
@Override
public String toString() {
return "HttpUrlSource{sourceInfo='" + sourceInfo + "}";
}
}