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Merge pull request #1253 from gechoto/fix-n-func
[YouTube] Fixes for n param deobfuscation function
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Stypox
GitHub
commit
1ca8275419
@ -30,21 +30,7 @@ final class YoutubeThrottlingParameterUtils {
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private static final Pattern[] DEOBFUSCATION_FUNCTION_NAME_REGEXES = {
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/*
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* The first regex matches the following text, where we want Wma and the array index
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* accessed:
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*
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* a.D&&(b="nn"[+a.D],WL(a),c=a.j[b]||null)&&(c=SDa[0](c),a.set(b,c),SDa.length||Wma("")
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*/
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Pattern.compile(SINGLE_CHAR_VARIABLE_REGEX + "=\"nn\"\\[\\+" + MULTIPLE_CHARS_REGEX
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+ "\\." + MULTIPLE_CHARS_REGEX + "]," + MULTIPLE_CHARS_REGEX + "\\("
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+ MULTIPLE_CHARS_REGEX + "\\)," + MULTIPLE_CHARS_REGEX + "="
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+ MULTIPLE_CHARS_REGEX + "\\." + MULTIPLE_CHARS_REGEX + "\\["
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+ MULTIPLE_CHARS_REGEX + "]\\|\\|null\\).+\\|\\|(" + MULTIPLE_CHARS_REGEX
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+ ")\\(\"\"\\)"),
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/*
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* The second regex matches the following text, where we want SDa and the array index
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* accessed:
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* Matches the following text, where we want SDa and the array index accessed:
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*
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* a.D&&(b="nn"[+a.D],WL(a),c=a.j[b]||null)&&(c=SDa[0](c),a.set(b,c),SDa.length||Wma("")
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*/
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@ -56,7 +42,33 @@ final class YoutubeThrottlingParameterUtils {
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+ MULTIPLE_CHARS_REGEX + ")" + ARRAY_ACCESS_REGEX),
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/*
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* The third regex matches the following text, where we want rma:
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* Matches the following text, where we want Wma:
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*
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* a.D&&(b="nn"[+a.D],WL(a),c=a.j[b]||null)&&(c=SDa[0](c),a.set(b,c),SDa.length||Wma("")
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*/
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Pattern.compile(SINGLE_CHAR_VARIABLE_REGEX + "=\"nn\"\\[\\+" + MULTIPLE_CHARS_REGEX
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+ "\\." + MULTIPLE_CHARS_REGEX + "]," + MULTIPLE_CHARS_REGEX + "\\("
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+ MULTIPLE_CHARS_REGEX + "\\)," + MULTIPLE_CHARS_REGEX + "="
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+ MULTIPLE_CHARS_REGEX + "\\." + MULTIPLE_CHARS_REGEX + "\\["
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+ MULTIPLE_CHARS_REGEX + "]\\|\\|null\\).+\\|\\|(" + MULTIPLE_CHARS_REGEX
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+ ")\\(\"\"\\)"),
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/*
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* Matches the following text, where we want cvb and the array index accessed:
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*
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* ,Vb(m),W=m.j[c]||null)&&(W=cvb[0](W),m.set(c,W)
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*/
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Pattern.compile("," + MULTIPLE_CHARS_REGEX + "\\("
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+ MULTIPLE_CHARS_REGEX + "\\)," + MULTIPLE_CHARS_REGEX + "="
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+ MULTIPLE_CHARS_REGEX + "\\." + MULTIPLE_CHARS_REGEX + "\\["
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+ MULTIPLE_CHARS_REGEX + "]\\|\\|null\\)&&\\(\\b" + MULTIPLE_CHARS_REGEX + "=("
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+ MULTIPLE_CHARS_REGEX + ")" + ARRAY_ACCESS_REGEX + "\\("
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+ SINGLE_CHAR_VARIABLE_REGEX + "\\)," + MULTIPLE_CHARS_REGEX
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+ "\\.set\\((?:\"n+\"|" + MULTIPLE_CHARS_REGEX + ")," + MULTIPLE_CHARS_REGEX
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+ "\\)"),
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/*
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* Matches the following text, where we want rma:
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*
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* a.D&&(b="nn"[+a.D],c=a.get(b))&&(c=rDa[0](c),a.set(b,c),rDa.length||rma("")
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*/
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@ -66,8 +78,7 @@ final class YoutubeThrottlingParameterUtils {
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+ MULTIPLE_CHARS_REGEX + ")\\(\"\"\\)"),
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/*
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* The fourth regex matches the following text, where we want rDa and the array index
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* accessed:
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* Matches the following text, where we want rDa and the array index accessed:
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*
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* a.D&&(b="nn"[+a.D],c=a.get(b))&&(c=rDa[0](c),a.set(b,c),rDa.length||rma("")
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*/
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@ -77,8 +88,7 @@ final class YoutubeThrottlingParameterUtils {
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+ MULTIPLE_CHARS_REGEX + "=(" + MULTIPLE_CHARS_REGEX + ")\\[(\\d+)]"),
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/*
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* The fifth regex matches the following text, where we want BDa and the array index
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* accessed:
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* Matches the following text, where we want BDa and the array index accessed:
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*
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* (b=String.fromCharCode(110),c=a.get(b))&&(c=BDa[0](c)
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*/
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@ -89,8 +99,7 @@ final class YoutubeThrottlingParameterUtils {
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+ SINGLE_CHAR_VARIABLE_REGEX + "\\)"),
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/*
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* The sixth regex matches the following text, where we want Yva and the array index
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* accessed:
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* Matches the following text, where we want Yva and the array index accessed:
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*
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* .get("n"))&&(b=Yva[0](b)
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*/
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@ -112,6 +121,13 @@ final class YoutubeThrottlingParameterUtils {
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private static final String FUNCTION_NAMES_IN_DEOBFUSCATION_ARRAY_REGEX =
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"\\s*=\\s*\\[(.+?)][;,]";
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private static final String FUNCTION_ARGUMENTS_REGEX =
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"=\\s*function\\s*\\(\\s*([^)]*)\\s*\\)";
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private static final String EARLY_RETURN_REGEX =
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";\\s*if\\s*\\(\\s*typeof\\s+" + MULTIPLE_CHARS_REGEX
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+ "+\\s*===?\\s*([\"'])undefined\\1\\s*\\)\\s*return\\s+";
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private YoutubeThrottlingParameterUtils() {
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}
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@ -154,7 +170,7 @@ final class YoutubeThrottlingParameterUtils {
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* Get the throttling parameter deobfuscation code of YouTube's base JavaScript file.
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*
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* @param javaScriptPlayerCode the complete JavaScript base player code
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* @return the throttling parameter deobfuscation function name
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* @return the throttling parameter deobfuscation function code
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* @throws ParsingException if the throttling parameter deobfuscation code couldn't be
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* extracted
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*/
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@ -162,11 +178,13 @@ final class YoutubeThrottlingParameterUtils {
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static String getDeobfuscationFunction(@Nonnull final String javaScriptPlayerCode,
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@Nonnull final String functionName)
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throws ParsingException {
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String function;
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try {
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return parseFunctionWithLexer(javaScriptPlayerCode, functionName);
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function = parseFunctionWithLexer(javaScriptPlayerCode, functionName);
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} catch (final Exception e) {
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return parseFunctionWithRegex(javaScriptPlayerCode, functionName);
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function = parseFunctionWithRegex(javaScriptPlayerCode, functionName);
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}
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return fixupFunction(function);
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}
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/**
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@ -214,4 +232,33 @@ final class YoutubeThrottlingParameterUtils {
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JavaScript.compileOrThrow(function);
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return function;
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}
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/**
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* Removes an early return statement from the code of the throttling parameter deobfuscation function.
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*
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* <p>In newer version of the player code the function contains a check for something defined outside of the function.
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* If that was not found it will return early.
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*
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* <p>The check can look like this (JS):<br>
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* if(typeof RUQ==="undefined")return p;
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*
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* <p>In this example RUQ will always be undefined when running the function as standalone.
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* If the check is kept it would just return p which is the input parameter and would be wrong.
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* For that reason this check and return statement needs to be removed.
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*
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* @param function the original throttling parameter deobfuscation function code
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* @return the throttling parameter deobfuscation function code with the early return statement removed
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*/
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@Nonnull
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private static String fixupFunction(@Nonnull final String function)
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throws Parser.RegexException {
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final String firstArgName = Parser
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.matchGroup1(FUNCTION_ARGUMENTS_REGEX, function)
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.split(",")[0].trim();
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final Pattern earlyReturnPattern = Pattern.compile(
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EARLY_RETURN_REGEX + firstArgName + ";",
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Pattern.DOTALL);
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final Matcher earlyReturnCodeMatcher = earlyReturnPattern.matcher(function);
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return earlyReturnCodeMatcher.replaceFirst(";");
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}
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}
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