CypherpunkSamurai/NewPipeExtractor
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Cache nParams to prevent executing the JavaScript function for the same nParam multiple times.

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Closes #689
This commit is contained in:
TobiGr 2021-07-22 18:52:58 +02:00
parent 3a3d1d7f2b
commit 1c30a2725e
1 changed files with 9 additions and 1 deletions
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10
extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeThrottlingDecrypter.java
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@ -4,6 +4,8 @@ import org.schabi.newpipe.extractor.exceptions.ParsingException;
import org.schabi.newpipe.extractor.utils.JavaScript; import org.schabi.newpipe.extractor.utils.JavaScript;
import org.schabi.newpipe.extractor.utils.Parser; import org.schabi.newpipe.extractor.utils.Parser;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern; import java.util.regex.Pattern;
/** /**
@ -24,6 +26,7 @@ import java.util.regex.Pattern;
public class YoutubeThrottlingDecrypter { public class YoutubeThrottlingDecrypter {
private static final String N_PARAM_REGEX = "[&?]n=([^&]+)"; private static final String N_PARAM_REGEX = "[&?]n=([^&]+)";
private static final Map<String, String> nParams = new HashMap<>();
private final String functionName; private final String functionName;
private final String function; private final String function;
@ -78,7 +81,12 @@ public class YoutubeThrottlingDecrypter {
} }
private String decryptNParam(String nParam) { private String decryptNParam(String nParam) {
return JavaScript.run(function, functionName, nParam); if (nParams.containsKey(nParam)) {
return nParams.get(nParam);
}
final String decryptedNParam = JavaScript.run(function, functionName, nParam);
nParams.put(nParam, decryptedNParam);
return decryptedNParam;
} }
private String replaceNParam(String url, String oldValue, String newValue) { private String replaceNParam(String url, String oldValue, String newValue) {