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fix too long file name for cache. Md5FileNameGenerator tests

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This commit is contained in:
Alexey Danilov
2015-09-21 23:38:57 +03:00
parent 15c5388f6c
commit f4b9e5c8f5
3 changed files with 108 additions and 23 deletions
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28
library/src/main/java/com/danikula/videocache/Md5FileNameGenerator.java
View File

@@ -3,8 +3,6 @@ package com.danikula.videocache;
import android.text.TextUtils;
import java.io.File;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import static com.danikula.videocache.Preconditions.checkNotNull;
@@ -15,6 +13,7 @@ import static com.danikula.videocache.Preconditions.checkNotNull;
*/
public class Md5FileNameGenerator implements FileNameGenerator {
private static final int MAX_EXTENSION_LENGTH = 4;
private final File cacheDirectory;
public Md5FileNameGenerator(File cacheDirectory) {
@@ -25,32 +24,15 @@ public class Md5FileNameGenerator implements FileNameGenerator {
public File generate(String url) {
checkNotNull(url);
String extension = getExtension(url);
String name = computeMD5(url);
String name = ProxyCacheUtils.computeMD5(url);
name = TextUtils.isEmpty(extension) ? name : name + "." + extension;
return new File(cacheDirectory, name);
}
private String getExtension(String url) {
int dotIndex = url.lastIndexOf('.');
int slashIndex = url.lastIndexOf(File.separator);
return dotIndex != -1 && dotIndex > slashIndex ? url.substring(dotIndex + 1, url.length()) : "";
}
private String computeMD5(String string) {
try {
MessageDigest messageDigest = MessageDigest.getInstance("MD5");
byte[] digestBytes = messageDigest.digest(string.getBytes());
return bytesToHexString(digestBytes);
} catch (NoSuchAlgorithmException e) {
throw new IllegalStateException(e);
}
}
private String bytesToHexString(byte[] bytes) {
StringBuffer sb = new StringBuffer();
for (byte b : bytes) {
sb.append(String.format("%02x", b));
}
return sb.toString();
int slashIndex = url.lastIndexOf('/');
return dotIndex != -1 && dotIndex > slashIndex && dotIndex + 2 + MAX_EXTENSION_LENGTH > url.length() ?
url.substring(dotIndex + 1, url.length()) : "";
}
}

21
library/src/main/java/com/danikula/videocache/ProxyCacheUtils.java
View File

@@ -10,6 +10,8 @@ import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import static com.danikula.videocache.Preconditions.checkArgument;
@@ -86,4 +88,23 @@ class ProxyCacheUtils {
}
}
}
static String computeMD5(String string) {
try {
MessageDigest messageDigest = MessageDigest.getInstance("MD5");
byte[] digestBytes = messageDigest.digest(string.getBytes());
return bytesToHexString(digestBytes);
} catch (NoSuchAlgorithmException e) {
throw new IllegalStateException(e);
}
}
static String bytesToHexString(byte[] bytes) {
StringBuffer sb = new StringBuffer();
for (byte b : bytes) {
sb.append(String.format("%02x", b));
}
return sb.toString();
}
}