[YouTube] Move meta info extraction to separate file

YoutubeParsingHelper was longer than 2000 lines which caused checkstyle issues

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeMetaInfoHelper.java

@@ -0,0 +1,200 @@
+package org.schabi.newpipe.extractor.services.youtube;
+
+import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.extractCachedUrlIfNeeded;
+import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.getTextFromObject;
+import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.getTextFromObjectOrThrow;
+import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.getUrlFromNavigationEndpoint;
+import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.isGoogleURL;
+import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
+import static org.schabi.newpipe.extractor.utils.Utils.replaceHttpWithHttps;
+
+import com.grack.nanojson.JsonArray;
+import com.grack.nanojson.JsonObject;
+
+import org.schabi.newpipe.extractor.MetaInfo;
+import org.schabi.newpipe.extractor.exceptions.ParsingException;
+import org.schabi.newpipe.extractor.stream.Description;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+
+import javax.annotation.Nonnull;
+
+public final class YoutubeMetaInfoHelper {
+
+    private YoutubeMetaInfoHelper() {
+    }
+
+
+    @Nonnull
+    public static List<MetaInfo> getMetaInfo(@Nonnull final JsonArray contents)
+            throws ParsingException {
+        final List<MetaInfo> metaInfo = new ArrayList<>();
+        for (final Object content : contents) {
+            final JsonObject resultObject = (JsonObject) content;
+            if (resultObject.has("itemSectionRenderer")) {
+                for (final Object sectionContentObject
+                        : resultObject.getObject("itemSectionRenderer").getArray("contents")) {
+
+                    final JsonObject sectionContent = (JsonObject) sectionContentObject;
+                    if (sectionContent.has("infoPanelContentRenderer")) {
+                        metaInfo.add(getInfoPanelContent(sectionContent
+                                .getObject("infoPanelContentRenderer")));
+                    }
+                    if (sectionContent.has("clarificationRenderer")) {
+                        metaInfo.add(getClarificationRenderer(sectionContent
+                                .getObject("clarificationRenderer")
+                        ));
+                    }
+                    if (sectionContent.has("emergencyOneboxRenderer")) {
+                        getEmergencyOneboxRenderer(
+                                sectionContent.getObject("emergencyOneboxRenderer"),
+                                metaInfo::add
+                        );
+                    }
+                }
+            }
+        }
+        return metaInfo;
+    }
+
+    @Nonnull
+    private static MetaInfo getInfoPanelContent(@Nonnull final JsonObject infoPanelContentRenderer)
+            throws ParsingException {
+        final MetaInfo metaInfo = new MetaInfo();
+        final StringBuilder sb = new StringBuilder();
+        for (final Object paragraph : infoPanelContentRenderer.getArray("paragraphs")) {
+            if (sb.length() != 0) {
+                sb.append("<br>");
+            }
+            sb.append(getTextFromObject((JsonObject) paragraph));
+        }
+        metaInfo.setContent(new Description(sb.toString(), Description.HTML));
+        if (infoPanelContentRenderer.has("sourceEndpoint")) {
+            final String metaInfoLinkUrl = getUrlFromNavigationEndpoint(
+                    infoPanelContentRenderer.getObject("sourceEndpoint"));
+            try {
+                metaInfo.addUrl(new URL(Objects.requireNonNull(extractCachedUrlIfNeeded(
+                        metaInfoLinkUrl))));
+            } catch (final NullPointerException | MalformedURLException e) {
+                throw new ParsingException("Could not get metadata info URL", e);
+            }
+
+            final String metaInfoLinkText = getTextFromObject(
+                    infoPanelContentRenderer.getObject("inlineSource"));
+            if (isNullOrEmpty(metaInfoLinkText)) {
+                throw new ParsingException("Could not get metadata info link text.");
+            }
+            metaInfo.addUrlText(metaInfoLinkText);
+        }
+
+        return metaInfo;
+    }
+
+    @Nonnull
+    private static MetaInfo getClarificationRenderer(
+            @Nonnull final JsonObject clarificationRenderer) throws ParsingException {
+        final MetaInfo metaInfo = new MetaInfo();
+
+        final String title = getTextFromObject(clarificationRenderer
+                .getObject("contentTitle"));
+        final String text = getTextFromObject(clarificationRenderer
+                .getObject("text"));
+        if (title == null || text == null) {
+            throw new ParsingException("Could not extract clarification renderer content");
+        }
+        metaInfo.setTitle(title);
+        metaInfo.setContent(new Description(text, Description.PLAIN_TEXT));
+
+        if (clarificationRenderer.has("actionButton")) {
+            final JsonObject actionButton = clarificationRenderer.getObject("actionButton")
+                    .getObject("buttonRenderer");
+            try {
+                final String url = getUrlFromNavigationEndpoint(actionButton
+                        .getObject("command"));
+                metaInfo.addUrl(new URL(Objects.requireNonNull(extractCachedUrlIfNeeded(url))));
+            } catch (final NullPointerException | MalformedURLException e) {
+                throw new ParsingException("Could not get metadata info URL", e);
+            }
+
+            final String metaInfoLinkText = getTextFromObject(
+                    actionButton.getObject("text"));
+            if (isNullOrEmpty(metaInfoLinkText)) {
+                throw new ParsingException("Could not get metadata info link text.");
+            }
+            metaInfo.addUrlText(metaInfoLinkText);
+        }
+
+        if (clarificationRenderer.has("secondaryEndpoint") && clarificationRenderer
+                .has("secondarySource")) {
+            final String url = getUrlFromNavigationEndpoint(clarificationRenderer
+                    .getObject("secondaryEndpoint"));
+            // Ignore Google URLs, because those point to a Google search about "Covid-19"
+            if (url != null && !isGoogleURL(url)) {
+                try {
+                    metaInfo.addUrl(new URL(url));
+                    final String description = getTextFromObject(clarificationRenderer
+                            .getObject("secondarySource"));
+                    metaInfo.addUrlText(description == null ? url : description);
+                } catch (final MalformedURLException e) {
+                    throw new ParsingException("Could not get metadata info secondary URL", e);
+                }
+            }
+        }
+
+        return metaInfo;
+    }
+
+    private static void getEmergencyOneboxRenderer(
+            @Nonnull final JsonObject emergencyOneboxRenderer,
+            final Consumer<MetaInfo> addMetaInfo
+    ) throws ParsingException {
+        final List<JsonObject> supportRenderers = emergencyOneboxRenderer.values()
+                .stream()
+                .filter(o -> o instanceof JsonObject
+                        && ((JsonObject) o).has("singleActionEmergencySupportRenderer"))
+                .map(o -> ((JsonObject) o).getObject("singleActionEmergencySupportRenderer"))
+                .collect(Collectors.toList());
+
+        if (supportRenderers.isEmpty()) {
+            throw new ParsingException("Could not extract any meta info from emergency renderer");
+        }
+
+        for (final JsonObject r : supportRenderers) {
+            final MetaInfo metaInfo = new MetaInfo();
+
+            // usually an encouragement like "We are with you"
+            final String title = getTextFromObjectOrThrow(r.getObject("title"), "title");
+            // usually a phone number
+            final String action = getTextFromObjectOrThrow(r.getObject("actionText"), "action");
+            // usually details about the phone number
+            final String details = getTextFromObjectOrThrow(r.getObject("detailsText"), "details");
+            // usually the name of an association
+            final String urlText = getTextFromObjectOrThrow(r.getObject("navigationText"),
+                    "urlText");
+
+            metaInfo.setTitle(title);
+            metaInfo.setContent(new Description(details + "\n" + action, Description.PLAIN_TEXT));
+            metaInfo.addUrlText(urlText);
+
+            // usually the webpage of the association
+            final String url = getUrlFromNavigationEndpoint(r.getObject("navigationEndpoint"));
+            if (url == null) {
+                throw new ParsingException("Could not extract emergency renderer url");
+            }
+
+            try {
+                metaInfo.addUrl(new URL(replaceHttpWithHttps(url)));
+            } catch (final MalformedURLException e) {
+                throw new ParsingException("Could not parse emergency renderer url", e);
+            }
+
+            addMetaInfo.accept(metaInfo);
+        }
+    }
+}