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[YouTube] Add parenthesis matching as way to parse decrypt function

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From @Stypox
This commit is contained in:
XiangRongLin 2021-07-29 21:23:00 +02:00
parent 2967d1ae6a
commit 60794aea31
2 changed files with 62 additions and 1 deletions
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16
extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeThrottlingDecrypter.java
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@ -3,6 +3,7 @@ package org.schabi.newpipe.extractor.services.youtube;
import org.schabi.newpipe.extractor.exceptions.ParsingException;
import org.schabi.newpipe.extractor.utils.JavaScript;
import org.schabi.newpipe.extractor.utils.Parser;
import org.schabi.newpipe.extractor.utils.StringUtil;
import javax.annotation.Nonnull;
import java.util.HashMap;
@ -71,7 +72,20 @@ public class YoutubeThrottlingDecrypter {
@Nonnull
private String parseDecodeFunction(final String playerJsCode, final String functionName)
throws Parser.RegexException {
Pattern functionPattern = Pattern.compile(functionName + "=function(.*?};)\n",
try {
return parseWithParenthesisMatching(playerJsCode, functionName);
} catch (Exception e) {
return parseWithRegex(playerJsCode, functionName);
}
}
private String parseWithParenthesisMatching(final String playerJsCode, final String functionName) {
final String functionBase = functionName + "=function";
return functionBase + StringUtil.matchToClosingParenthesis(playerJsCode, functionBase) + ";";
}
private String parseWithRegex(final String playerJsCode, final String functionName) throws Parser.RegexException {
Pattern functionPattern = Pattern.compile(functionName + "=function(.*?}};)\n",
Pattern.DOTALL);
return "function " + functionName + Parser.matchGroup1(functionPattern, playerJsCode);
}

47
extractor/src/main/java/org/schabi/newpipe/extractor/utils/StringUtil.java Normal file
View file

@ -0,0 +1,47 @@
package org.schabi.newpipe.extractor.utils;
import edu.umd.cs.findbugs.annotations.NonNull;
public class StringUtil {
private StringUtil() {
}
/**
* @param string The string to search in
* @param start A string from which to start searching.
* @return A substring where each '{' matches a '}'
* @throws IndexOutOfBoundsException If {@ string} does not contain {@code start}
*/
@NonNull
public static String matchToClosingParenthesis(@NonNull final String string, @NonNull final String start) {
int startIndex = string.indexOf(start);
if (startIndex < 0) {
throw new IndexOutOfBoundsException();
}
startIndex += start.length();
int endIndex = startIndex;
while (string.charAt(endIndex) != '{') {
++endIndex;
}
++endIndex;
int openParenthesis = 1;
while (openParenthesis > 0) {
switch (string.charAt(endIndex)) {
case '{':
++openParenthesis;
break;
case '}':
--openParenthesis;
break;
default:
break;
}
++endIndex;
}
return string.substring(startIndex, endIndex);
}
}