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Add more decryption function regexes #329

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May 29, 2020
Merged

Add more decryption function regexes #329

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36 changes: 19 additions & 17 deletions ...java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeStreamExtractor.java
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Original file line number Diff line number Diff line change
Expand Up @@ -581,14 +581,21 @@ public String getErrorMessage() {
private static final String HTTPS = "https:";
private static final String DECRYPTION_FUNC_NAME = "decrypt";

private final static String DECRYPTION_SIGNATURE_FUNCTION_REGEX =
"([\\w$]+)\\s*=\\s*function\\((\\w+)\\)\\{\\s*\\2=\\s*\\2\\.split\\(\"\"\\)\\s*;";
private final static String DECRYPTION_SIGNATURE_FUNCTION_REGEX_2 =
"\\b([\\w$]{2})\\s*=\\s*function\\((\\w+)\\)\\{\\s*\\2=\\s*\\2\\.split\\(\"\"\\)\\s*;";
private final static String DECRYPTION_AKAMAIZED_STRING_REGEX =
"yt\\.akamaized\\.net/\\)\\s*\\|\\|\\s*.*?\\s*c\\s*&&\\s*d\\.set\\([^,]+\\s*,\\s*(:encodeURIComponent\\s*\\()([a-zA-Z0-9$]+)\\(";
private final static String DECRYPTION_AKAMAIZED_SHORT_STRING_REGEX =
"\\bc\\s*&&\\s*d\\.set\\([^,]+\\s*,\\s*(:encodeURIComponent\\s*\\()([a-zA-Z0-9$]+)\\(";
private final static String[] REGEXES = {
"\\b[cs]\\s*&&\\s*[adf]\\.set\\([^,]+\\s*,\\s*encodeURIComponent\\s*\\(\\s*([a-zA-Z0-9$]+)\\(",
"\\b[a-zA-Z0-9]+\\s*&&\\s*[a-zA-Z0-9]+\\.set\\([^,]+\\s*,\\s*encodeURIComponent\\s*\\(\\s*([a-zA-Z0-9$]+)\\(",
"\\b([a-zA-Z0-9$]{2})\\s*=\\s*function\\(\\s*a\\s*\\)\\s*\\{\\s*a\\s*=\\s*a\\.split\\(\\s*\"\"\\s*\\)",
"([a-zA-Z0-9$]+)\\s*=\\s*function\\(\\s*a\\s*\\)\\s*\\{\\s*a\\s*=\\s*a\\.split\\(\\s*\"\"\\s*\\)",
// Obsolete patterns
"[\"']signature[\"']\\s*,\\s*([a-zA-Z0-9$]+)\\(",
"\\.sig\\|\\|([a-zA-Z0-9$]+)\\(",
"yt\\.akamaized\\.net/\\)\\s*\\|\\|\\s*.*?\\s*[cs]\\s*&&\\s*[adf]\\.set\\([^,]+\\s*,\\s*(?:encodeURIComponent\\s*\\()?\\s*([a-zA-Z0-9$]+)\\(",
"\\b[cs]\\s*&&\\s*[adf]\\.set\\([^,]+\\s*,\\s*([a-zA-Z0-9$]+)\\(",
"\\b[a-zA-Z0-9]+\\s*&&\\s*[a-zA-Z0-9]+\\.set\\([^,]+\\s*,\\s*([a-zA-Z0-9$]+)\\(",
"\\bc\\s*&&\\s*a\\.set\\([^,]+\\s*,\\s*\\([^)]*\\)\\s*\\(\\s*([a-zA-Z0-9$]+)\\(",
"\\bc\\s*&&\\s*[a-zA-Z0-9]+\\.set\\([^,]+\\s*,\\s*\\([^)]*\\)\\s*\\(\\s*([a-zA-Z0-9$]+)\\(",
"\\bc\\s*&&\\s*[a-zA-Z0-9]+\\.set\\([^,]+\\s*,\\s*\\([^)]*\\)\\s*\\(\\s*([a-zA-Z0-9$]+)\\("
};

private volatile String decryptionCode = "";

Expand Down Expand Up @@ -765,20 +772,15 @@ private String decryptSignature(String encryptedSig, String decryptionCode) thro
return result == null ? "" : result.toString();
}

private String getDecryptionFuncName(String playerCode) throws DecryptException {
String[] decryptionFuncNameRegexes = {
DECRYPTION_SIGNATURE_FUNCTION_REGEX_2,
DECRYPTION_SIGNATURE_FUNCTION_REGEX,
DECRYPTION_AKAMAIZED_SHORT_STRING_REGEX,
DECRYPTION_AKAMAIZED_STRING_REGEX
};
private String getDecryptionFuncName(final String playerCode) throws DecryptException {
Parser.RegexException exception = null;
for (String regex : decryptionFuncNameRegexes) {
for (final String regex : REGEXES) {
try {
return Parser.matchGroup1(regex, playerCode);
} catch (Parser.RegexException re) {
if (exception == null)
if (exception == null) {
exception = re;
}
}
}
throw new DecryptException("Could not find decrypt function with any of the given patterns.", exception);
Expand Down