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/* * Copyright (C) 2010 The Android Open Source Project */* w w w.ja v a2s .co m*/ * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.squareup.okhttp.internal.http; import com.squareup.okhttp.OkResponseCache; import com.squareup.okhttp.ResponseSource; import com.squareup.okhttp.internal.Base64; import com.squareup.okhttp.internal.DiskLruCache; import com.squareup.okhttp.internal.StrictLineReader; import com.squareup.okhttp.internal.Util; import java.io.BufferedWriter; import java.io.ByteArrayInputStream; import java.io.File; import java.io.FilterInputStream; import java.io.FilterOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.UnsupportedEncodingException; import java.io.Writer; import java.net.CacheRequest; import java.net.CacheResponse; import java.net.HttpURLConnection; import java.net.ResponseCache; import java.net.SecureCacheResponse; import java.net.URI; import java.net.URLConnection; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.security.Principal; import java.security.cert.Certificate; import java.security.cert.CertificateEncodingException; import java.security.cert.CertificateException; import java.security.cert.CertificateFactory; import java.security.cert.X509Certificate; import java.util.Arrays; import java.util.List; import java.util.Map; import javax.net.ssl.HttpsURLConnection; import javax.net.ssl.SSLPeerUnverifiedException; import static com.squareup.okhttp.internal.Util.US_ASCII; import static com.squareup.okhttp.internal.Util.UTF_8; /** * Cache responses in a directory on the file system. Most clients should use * {@code android.net.HttpResponseCache}, the stable, documented front end for * this. */ public final class HttpResponseCache extends ResponseCache implements OkResponseCache { private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; // TODO: add APIs to iterate the cache? private static final int VERSION = 201105; private static final int ENTRY_METADATA = 0; private static final int ENTRY_BODY = 1; private static final int ENTRY_COUNT = 2; private final DiskLruCache cache; /* read and write statistics, all guarded by 'this' */ private int writeSuccessCount; private int writeAbortCount; private int networkCount; private int hitCount; private int requestCount; public HttpResponseCache(File directory, long maxSize) throws IOException { cache = DiskLruCache.open(directory, VERSION, ENTRY_COUNT, maxSize); } private String uriToKey(URI uri) { try { MessageDigest messageDigest = MessageDigest.getInstance("MD5"); byte[] md5bytes = messageDigest.digest(uri.toString().getBytes("UTF-8")); return bytesToHexString(md5bytes); } catch (NoSuchAlgorithmException e) { throw new AssertionError(e); } catch (UnsupportedEncodingException e) { throw new AssertionError(e); } } private static String bytesToHexString(byte[] bytes) { char[] digits = DIGITS; char[] buf = new char[bytes.length * 2]; int c = 0; for (byte b : bytes) { buf[c++] = digits[(b >> 4) & 0xf]; buf[c++] = digits[b & 0xf]; } return new String(buf); } @Override public CacheResponse get(URI uri, String requestMethod, Map<String, List<String>> requestHeaders) { String key = uriToKey(uri); DiskLruCache.Snapshot snapshot; Entry entry; try { snapshot = cache.get(key); if (snapshot == null) { return null; } entry = new Entry(snapshot.getInputStream(ENTRY_METADATA)); } catch (IOException e) { // Give up because the cache cannot be read. return null; } if (!entry.matches(uri, requestMethod, requestHeaders)) { snapshot.close(); return null; } return entry.isHttps() ? new EntrySecureCacheResponse(entry, snapshot) : new EntryCacheResponse(entry, snapshot); } @Override public CacheRequest put(URI uri, URLConnection urlConnection) throws IOException { if (!(urlConnection instanceof HttpURLConnection)) { return null; } HttpURLConnection httpConnection = (HttpURLConnection) urlConnection; String requestMethod = httpConnection.getRequestMethod(); String key = uriToKey(uri); if (requestMethod.equals("POST") || requestMethod.equals("PUT") || requestMethod.equals( "DELETE")) { try { cache.remove(key); } catch (IOException ignored) { // The cache cannot be written. } return null; } else if (!requestMethod.equals("GET")) { // Don't cache non-GET responses. We're technically allowed to cache // HEAD requests and some POST requests, but the complexity of doing // so is high and the benefit is low. return null; } HttpEngine httpEngine = getHttpEngine(httpConnection); if (httpEngine == null) { // Don't cache unless the HTTP implementation is ours. return null; } ResponseHeaders response = httpEngine.getResponseHeaders(); if (response.hasVaryAll()) { return null; } RawHeaders varyHeaders = httpEngine.getRequestHeaders().getHeaders().getAll(response.getVaryFields()); Entry entry = new Entry(uri, varyHeaders, httpConnection); DiskLruCache.Editor editor = null; try { editor = cache.edit(key); if (editor == null) { return null; } entry.writeTo(editor); return new CacheRequestImpl(editor); } catch (IOException e) { abortQuietly(editor); return null; } } /** * Handles a conditional request hit by updating the stored cache response * with the headers from {@code httpConnection}. The cached response body is * not updated. If the stored response has changed since {@code * conditionalCacheHit} was returned, this does nothing. */ @Override public void update(CacheResponse conditionalCacheHit, HttpURLConnection httpConnection) throws IOException { HttpEngine httpEngine = getHttpEngine(httpConnection); URI uri = httpEngine.getUri(); ResponseHeaders response = httpEngine.getResponseHeaders(); RawHeaders varyHeaders = httpEngine.getRequestHeaders().getHeaders().getAll(response.getVaryFields()); Entry entry = new Entry(uri, varyHeaders, httpConnection); DiskLruCache.Snapshot snapshot = (conditionalCacheHit instanceof EntryCacheResponse) ? ((EntryCacheResponse) conditionalCacheHit).snapshot : ((EntrySecureCacheResponse) conditionalCacheHit).snapshot; DiskLruCache.Editor editor = null; try { editor = snapshot.edit(); // returns null if snapshot is not current if (editor != null) { entry.writeTo(editor); editor.commit(); } } catch (IOException e) { abortQuietly(editor); } } private void abortQuietly(DiskLruCache.Editor editor) { // Give up because the cache cannot be written. try { if (editor != null) { editor.abort(); } } catch (IOException ignored) { } } private HttpEngine getHttpEngine(URLConnection httpConnection) { if (httpConnection instanceof HttpURLConnectionImpl) { return ((HttpURLConnectionImpl) httpConnection).getHttpEngine(); } else if (httpConnection instanceof HttpsURLConnectionImpl) { return ((HttpsURLConnectionImpl) httpConnection).getHttpEngine(); } else { return null; } } public DiskLruCache getCache() { return cache; } public synchronized int getWriteAbortCount() { return writeAbortCount; } public synchronized int getWriteSuccessCount() { return writeSuccessCount; } public synchronized void trackResponse(ResponseSource source) { requestCount++; switch (source) { case CACHE: hitCount++; break; case CONDITIONAL_CACHE: case NETWORK: networkCount++; break; } } public synchronized void trackConditionalCacheHit() { hitCount++; } public synchronized int getNetworkCount() { return networkCount; } public synchronized int getHitCount() { return hitCount; } public synchronized int getRequestCount() { return requestCount; } private final class CacheRequestImpl extends CacheRequest { private final DiskLruCache.Editor editor; private OutputStream cacheOut; private boolean done; private OutputStream body; public CacheRequestImpl(final DiskLruCache.Editor editor) throws IOException { this.editor = editor; this.cacheOut = editor.newOutputStream(ENTRY_BODY); this.body = new FilterOutputStream(cacheOut) { @Override public void close() throws IOException { synchronized (HttpResponseCache.this) { if (done) { return; } done = true; writeSuccessCount++; } super.close(); editor.commit(); } @Override public void write(byte[] buffer, int offset, int length) throws IOException { // Since we don't override "write(int oneByte)", we can write directly to "out" // and avoid the inefficient implementation from the FilterOutputStream. out.write(buffer, offset, length); } }; } @Override public void abort() { synchronized (HttpResponseCache.this) { if (done) { return; } done = true; writeAbortCount++; } Util.closeQuietly(cacheOut); try { editor.abort(); } catch (IOException ignored) { } } @Override public OutputStream getBody() throws IOException { return body; } } private static final class Entry { private final String uri; private final RawHeaders varyHeaders; private final String requestMethod; private final RawHeaders responseHeaders; private final String cipherSuite; private final Certificate[] peerCertificates; private final Certificate[] localCertificates; /** * Reads an entry from an input stream. A typical entry looks like this: * <pre>{@code * http://google.com/foo * GET * 2 * Accept-Language: fr-CA * Accept-Charset: UTF-8 * HTTP/1.1 200 OK * 3 * Content-Type: image/png * Content-Length: 100 * Cache-Control: max-age=600 * }</pre> * * <p>A typical HTTPS file looks like this: * <pre>{@code * https://google.com/foo * GET * 2 * Accept-Language: fr-CA * Accept-Charset: UTF-8 * HTTP/1.1 200 OK * 3 * Content-Type: image/png * Content-Length: 100 * Cache-Control: max-age=600 * * AES_256_WITH_MD5 * 2 * base64-encoded peerCertificate[0] * base64-encoded peerCertificate[1] * -1 * }</pre> * The file is newline separated. The first two lines are the URL and * the request method. Next is the number of HTTP Vary request header * lines, followed by those lines. * * <p>Next is the response status line, followed by the number of HTTP * response header lines, followed by those lines. * * <p>HTTPS responses also contain SSL session information. This begins * with a blank line, and then a line containing the cipher suite. Next * is the length of the peer certificate chain. These certificates are * base64-encoded and appear each on their own line. The next line * contains the length of the local certificate chain. These * certificates are also base64-encoded and appear each on their own * line. A length of -1 is used to encode a null array. */ public Entry(InputStream in) throws IOException { try { StrictLineReader reader = new StrictLineReader(in, US_ASCII); uri = reader.readLine(); requestMethod = reader.readLine(); varyHeaders = new RawHeaders(); int varyRequestHeaderLineCount = reader.readInt(); for (int i = 0; i < varyRequestHeaderLineCount; i++) { varyHeaders.addLine(reader.readLine()); } responseHeaders = new RawHeaders(); responseHeaders.setStatusLine(reader.readLine()); int responseHeaderLineCount = reader.readInt(); for (int i = 0; i < responseHeaderLineCount; i++) { responseHeaders.addLine(reader.readLine()); } if (isHttps()) { String blank = reader.readLine(); if (!blank.isEmpty()) { throw new IOException("expected \"\" but was \"" + blank + "\""); } cipherSuite = reader.readLine(); peerCertificates = readCertArray(reader); localCertificates = readCertArray(reader); } else { cipherSuite = null; peerCertificates = null; localCertificates = null; } } finally { in.close(); } } public Entry(URI uri, RawHeaders varyHeaders, HttpURLConnection httpConnection) throws IOException { this.uri = uri.toString(); this.varyHeaders = varyHeaders; this.requestMethod = httpConnection.getRequestMethod(); this.responseHeaders = RawHeaders.fromMultimap(httpConnection.getHeaderFields(), true); if (isHttps()) { HttpsURLConnection httpsConnection = (HttpsURLConnection) httpConnection; cipherSuite = httpsConnection.getCipherSuite(); Certificate[] peerCertificatesNonFinal = null; try { peerCertificatesNonFinal = httpsConnection.getServerCertificates(); } catch (SSLPeerUnverifiedException ignored) { } peerCertificates = peerCertificatesNonFinal; localCertificates = httpsConnection.getLocalCertificates(); } else { cipherSuite = null; peerCertificates = null; localCertificates = null; } } public void writeTo(DiskLruCache.Editor editor) throws IOException { OutputStream out = editor.newOutputStream(ENTRY_METADATA); Writer writer = new BufferedWriter(new OutputStreamWriter(out, UTF_8)); writer.write(uri + '\n'); writer.write(requestMethod + '\n'); writer.write(Integer.toString(varyHeaders.length()) + '\n'); for (int i = 0; i < varyHeaders.length(); i++) { writer.write(varyHeaders.getFieldName(i) + ": " + varyHeaders.getValue(i) + '\n'); } writer.write(responseHeaders.getStatusLine() + '\n'); writer.write(Integer.toString(responseHeaders.length()) + '\n'); for (int i = 0; i < responseHeaders.length(); i++) { writer.write(responseHeaders.getFieldName(i) + ": " + responseHeaders.getValue(i) + '\n'); } if (isHttps()) { writer.write('\n'); writer.write(cipherSuite + '\n'); writeCertArray(writer, peerCertificates); writeCertArray(writer, localCertificates); } writer.close(); } private boolean isHttps() { return uri.startsWith("https://"); } private Certificate[] readCertArray(StrictLineReader reader) throws IOException { int length = reader.readInt(); if (length == -1) { return null; } try { CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509"); Certificate[] result = new Certificate[length]; for (int i = 0; i < result.length; i++) { String line = reader.readLine(); byte[] bytes = Base64.decode(line.getBytes("US-ASCII")); result[i] = certificateFactory.generateCertificate(new ByteArrayInputStream(bytes)); } return result; } catch (CertificateException e) { throw new IOException(e); } } private void writeCertArray(Writer writer, Certificate[] certificates) throws IOException { if (certificates == null) { writer.write("-1\n"); return; } try { writer.write(Integer.toString(certificates.length) + '\n'); for (Certificate certificate : certificates) { byte[] bytes = certificate.getEncoded(); String line = Base64.encode(bytes); writer.write(line + '\n'); } } catch (CertificateEncodingException e) { throw new IOException(e); } } public boolean matches(URI uri, String requestMethod, Map<String, List<String>> requestHeaders) { return this.uri.equals(uri.toString()) && this.requestMethod.equals(requestMethod) && new ResponseHeaders(uri, responseHeaders).varyMatches(varyHeaders.toMultimap(false), requestHeaders); } } /** * Returns an input stream that reads the body of a snapshot, closing the * snapshot when the stream is closed. */ private static InputStream newBodyInputStream(final DiskLruCache.Snapshot snapshot) { return new FilterInputStream(snapshot.getInputStream(ENTRY_BODY)) { @Override public void close() throws IOException { snapshot.close(); super.close(); } }; } static class EntryCacheResponse extends CacheResponse { private final Entry entry; private final DiskLruCache.Snapshot snapshot; private final InputStream in; public EntryCacheResponse(Entry entry, DiskLruCache.Snapshot snapshot) { this.entry = entry; this.snapshot = snapshot; this.in = newBodyInputStream(snapshot); } @Override public Map<String, List<String>> getHeaders() { return entry.responseHeaders.toMultimap(true); } @Override public InputStream getBody() { return in; } } static class EntrySecureCacheResponse extends SecureCacheResponse { private final Entry entry; private final DiskLruCache.Snapshot snapshot; private final InputStream in; public EntrySecureCacheResponse(Entry entry, DiskLruCache.Snapshot snapshot) { this.entry = entry; this.snapshot = snapshot; this.in = newBodyInputStream(snapshot); } @Override public Map<String, List<String>> getHeaders() { return entry.responseHeaders.toMultimap(true); } @Override public InputStream getBody() { return in; } @Override public String getCipherSuite() { return entry.cipherSuite; } @Override public List<Certificate> getServerCertificateChain() throws SSLPeerUnverifiedException { if (entry.peerCertificates == null || entry.peerCertificates.length == 0) { throw new SSLPeerUnverifiedException(null); } return Arrays.asList(entry.peerCertificates.clone()); } @Override public Principal getPeerPrincipal() throws SSLPeerUnverifiedException { if (entry.peerCertificates == null || entry.peerCertificates.length == 0) { throw new SSLPeerUnverifiedException(null); } return ((X509Certificate) entry.peerCertificates[0]).getSubjectX500Principal(); } @Override public List<Certificate> getLocalCertificateChain() { if (entry.localCertificates == null || entry.localCertificates.length == 0) { return null; } return Arrays.asList(entry.localCertificates.clone()); } @Override public Principal getLocalPrincipal() { if (entry.localCertificates == null || entry.localCertificates.length == 0) { return null; } return ((X509Certificate) entry.localCertificates[0]).getSubjectX500Principal(); } } }