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[YouTube] Fix extraction of n param deobfuscation function name and fixup function to prevent early return

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gechoto 2024-12-29 01:33:58 +01:00 committed by Stypox
parent ea401638f4
commit 56595bd9d5
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1 changed files with 41 additions and 8 deletions
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49
extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeThrottlingParameterUtils.java
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@ -30,17 +30,31 @@ final class YoutubeThrottlingParameterUtils {
private static final Pattern[] DEOBFUSCATION_FUNCTION_NAME_REGEXES = {
/*
* The first regex matches the following text, where we want Wma and the array index
* The first regex matches the following text, where we want SDa and the array index
* accessed:
*
* a.D&&(b="nn"[+a.D],WL(a),c=a.j[b]||null)&&(c=SDa[0](c),a.set(b,c),SDa.length||Wma("")
* WL(a),c=a.j[b]||null)&&(c=SDa[0](
*/
Pattern.compile(SINGLE_CHAR_VARIABLE_REGEX + "=\"nn\"\\[\\+" + MULTIPLE_CHARS_REGEX
+ "\\." + MULTIPLE_CHARS_REGEX + "]," + MULTIPLE_CHARS_REGEX + "\\("
Pattern.compile(MULTIPLE_CHARS_REGEX + "\\("
+ MULTIPLE_CHARS_REGEX + "\\)," + MULTIPLE_CHARS_REGEX + "="
+ MULTIPLE_CHARS_REGEX + "\\." + MULTIPLE_CHARS_REGEX + "\\["
+ MULTIPLE_CHARS_REGEX + "]\\|\\|null\\).+\\|\\|(" + MULTIPLE_CHARS_REGEX
+ ")\\(\"\"\\)"),
+ MULTIPLE_CHARS_REGEX + "]\\|\\|null\\)&&\\(" + MULTIPLE_CHARS_REGEX + "=("
+ MULTIPLE_CHARS_REGEX + ")" + ARRAY_ACCESS_REGEX + "\\("),
/*
* This regex matches the following text, where we want Wma:
*
* a.D&&(b="nn"[+a.D],WL(a),c=a.j[b]||null)&&(c=SDa[0](c),a.set(b,c),SDa.length||Wma("")
*
* UPDATE: This is broken and Wma is not the function needed anymore.
* We need the function which is in SDa[0] instead.
*/
// Pattern.compile(SINGLE_CHAR_VARIABLE_REGEX + "=\"nn\"\\[\\+" + MULTIPLE_CHARS_REGEX
// + "\\." + MULTIPLE_CHARS_REGEX + "]," + MULTIPLE_CHARS_REGEX + "\\("
// + MULTIPLE_CHARS_REGEX + "\\)," + MULTIPLE_CHARS_REGEX + "="
// + MULTIPLE_CHARS_REGEX + "\\." + MULTIPLE_CHARS_REGEX + "\\["
// + MULTIPLE_CHARS_REGEX + "]\\|\\|null\\).+\\|\\|(" + MULTIPLE_CHARS_REGEX
// + ")\\(\"\"\\)"),
/*
* The second regex matches the following text, where we want SDa and the array index
@ -112,6 +126,12 @@ final class YoutubeThrottlingParameterUtils {
private static final String FUNCTION_NAMES_IN_DEOBFUSCATION_ARRAY_REGEX =
"\\s*=\\s*\\[(.+?)][;,]";
private static final String FUNCTION_ARGUMENTS_REGEX =
"=\\s*function\\s*\\(\\s*([^)]*)\\s*\\)";
private static final String EARLY_RETURN_REGEX =
";\\s*if\\s*\\(\\s*typeof\\s+" + MULTIPLE_CHARS_REGEX + "+\\s*===?\\s*([\"'])undefined\\1\\s*\\)\\s*return\\s+";
private YoutubeThrottlingParameterUtils() {
}
@ -162,11 +182,13 @@ final class YoutubeThrottlingParameterUtils {
static String getDeobfuscationFunction(@Nonnull final String javaScriptPlayerCode,
@Nonnull final String functionName)
throws ParsingException {
String function;
try {
return parseFunctionWithLexer(javaScriptPlayerCode, functionName);
function = parseFunctionWithLexer(javaScriptPlayerCode, functionName);
} catch (final Exception e) {
return parseFunctionWithRegex(javaScriptPlayerCode, functionName);
function = parseFunctionWithRegex(javaScriptPlayerCode, functionName);
}
return fixupFunction(function);
}
/**
@ -214,4 +236,15 @@ final class YoutubeThrottlingParameterUtils {
JavaScript.compileOrThrow(function);
return function;
}
@Nonnull
private static String fixupFunction(@Nonnull final String function)
throws Parser.RegexException {
final String firstArgName = Parser.matchGroup1(FUNCTION_ARGUMENTS_REGEX, function).split(",")[0].trim();
final Pattern earlyReturnPattern = Pattern.compile(
EARLY_RETURN_REGEX + firstArgName + ";",
Pattern.DOTALL);
final Matcher earlyReturnCodeMatcher = earlyReturnPattern.matcher(function);
return earlyReturnCodeMatcher.replaceFirst(";");
}
}