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Merge pull request #4110 from ByteHamster/fix-long-filename 

Fixed adding feeds with long filename
This commit is contained in:
H. Lehmann 2020-05-04 16:26:48 +02:00 committed by GitHub
parent 8e447ce343 00de47acdd
commit 8c77f54b37
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2 changed files with 44 additions and 1 deletions
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19
app/src/androidTest/java/de/test/antennapod/util/FilenameGeneratorTest.java
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@ -9,11 +9,13 @@ import java.io.File;
import java.io.IOException;
import de.danoeh.antennapod.core.util.FileNameGenerator;
import org.apache.commons.lang3.StringUtils;
import org.junit.After;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertTrue;
@SmallTest
@ -66,6 +68,23 @@ public class FilenameGeneratorTest {
assertFalse(TextUtils.isEmpty(result));
}
@Test
public void testLongFilename() throws IOException {
String longName = StringUtils.repeat("x", 20 + FileNameGenerator.MAX_FILENAME_LENGTH);
String result = FileNameGenerator.generateFileName(longName);
assertTrue(result.length() <= FileNameGenerator.MAX_FILENAME_LENGTH);
createFiles(result);
}
@Test
public void testLongFilenameNotEquals() {
// Verify that the name is not just trimmed and different suffixes end up with the same name
String longName = StringUtils.repeat("x", 20 + FileNameGenerator.MAX_FILENAME_LENGTH);
String result1 = FileNameGenerator.generateFileName(longName + "a");
String result2 = FileNameGenerator.generateFileName(longName + "b");
assertNotEquals(result1, result2);
}
/**
* Tests if files can be created.
*

26
core/src/main/java/de/danoeh/antennapod/core/util/FileNameGenerator.java
View File

@ -2,11 +2,18 @@ package de.danoeh.antennapod.core.util;
import android.text.TextUtils;
import androidx.annotation.VisibleForTesting;
import org.apache.commons.lang3.ArrayUtils;
import java.io.UnsupportedEncodingException;
import java.security.NoSuchAlgorithmException;
/** Generates valid filenames for a given string. */
public class FileNameGenerator {
@VisibleForTesting
public static final int MAX_FILENAME_LENGTH = 255; // Limited by ext4
private static final int MD5_HEX_LENGTH = 32;
private static final char[] validChars =
("abcdefghijklmnopqrstuvwxyz"
@ -36,8 +43,11 @@ public class FileNameGenerator {
String filename = buf.toString().trim();
if (TextUtils.isEmpty(filename)) {
return randomString(8);
} else if (filename.length() >= MAX_FILENAME_LENGTH) {
return filename.substring(0, MAX_FILENAME_LENGTH - MD5_HEX_LENGTH - 1) + "_" + md5(filename);
} else {
return filename;
}
return filename;
}
private static String randomString(int length) {
@ -47,4 +57,18 @@ public class FileNameGenerator {
}
return sb.toString();
}
private static String md5(String md5) {
try {
java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
byte[] array = md.digest(md5.getBytes("UTF-8"));
StringBuilder sb = new StringBuilder();
for (byte b : array) {
sb.append(Integer.toHexString((b & 0xFF) | 0x100).substring(1, 3));
}
return sb.toString();
} catch (NoSuchAlgorithmException | UnsupportedEncodingException e) {
return null;
}
}
}