New synthetic keyword for document generator meta tag.

code/processes/converting-process/src/main/java/nu/marginalia/converting/processor/logic/DocumentGeneratorExtractor.java

@@ -0,0 +1,89 @@
+package nu.marginalia.converting.processor.logic;
+
+import org.apache.commons.lang3.StringUtils;
+import org.jsoup.nodes.Document;
+
+import java.util.Collections;
+import java.util.List;
+
+/** Extract keywords for the document meta generator tag */
+public class DocumentGeneratorExtractor {
+
+    public List<String> generatorCleaned(Document doc) {
+
+        String generator = doc
+                .select("meta[name=generator]")
+                .attr("content");
+
+        // Remove leading or trailing junk from the generator string, "powered by" etc.
+        generator = trim(generator);
+
+        if (generator.isBlank())
+            return Collections.emptyList();
+
+        String[] parts = StringUtils.split(generator, " ,:!");
+        if (parts.length == 0)
+            return Collections.emptyList();
+
+        int slashIdx = parts[0].indexOf('/');
+        if (slashIdx >= 0) {
+            // mozilla and staroffice has a really weird format
+            return List.of(parts[0].substring(0, slashIdx));
+        }
+
+        if (parts.length > 3) {
+            return Collections.emptyList(); // if it's still very long after trim(), it's probably a custom hand written message
+        }
+
+        switch (parts[0]) {
+            case "joomla!":
+                return List.of("joomla");
+            case "plone":
+            case "claris":
+            case "one.com":
+            case "wix.com":
+            case "wpbakery":
+                return List.of(parts[0]);
+            case "adobe":
+            case "microsoft":
+                return List.of(parts[1]);
+        }
+
+        if (parts.length > 1) {
+            return List.of(parts[0], parts[0] + "_" + truncVersion(parts[1]));
+        }
+        else {
+            return List.of(parts[0]);
+        }
+    }
+
+    private String trim(String generator) {
+
+        generator = generator.toLowerCase().trim();
+        if (generator.startsWith("powered by ")) {
+            generator = generator.substring("powered by ".length());
+        }
+
+        int dashIdx = generator.indexOf('-'); // Some strings have values like 'foobar 2.3 - the free online generator!'
+        if (dashIdx >= 0) {
+            generator = generator.substring(0, dashIdx);
+        }
+
+        if (!StringUtils.isAsciiPrintable(generator))
+            return "";
+
+        return generator;
+    }
+
+    // Censor exact version strings, being able to search by major version is enough
+    // for any non-blackhat purpose
+    private String truncVersion(String part) {
+        int periodIdx = part.indexOf('.', part.startsWith("0.") ? 2 : 0);
+
+        if (periodIdx < 0)
+            return part;
+
+        return part.substring(0, periodIdx);
+    }
+
+}

code/processes/converting-process/src/main/java/nu/marginalia/converting/processor/plugin/AbstractDocumentProcessorPlugin.java

@@ -59,6 +59,15 @@ public MetaTagsBuilder addUrl(EdgeUrl url) {
             return this;
         }
 
+        public MetaTagsBuilder addGenerator(List<String> generators) {
+
+            for (var generator : generators) {
+                add("generator", generator);
+            }
+
+            return this;
+        }
+
         public MetaTagsBuilder addFormat(HtmlStandard standard) {
 
             add("format", standard);

code/processes/converting-process/src/main/java/nu/marginalia/converting/processor/plugin/HtmlDocumentProcessorPlugin.java

@@ -54,6 +54,7 @@ public class HtmlDocumentProcessorPlugin extends AbstractDocumentProcessorPlugin
     private final DocumentLengthLogic documentLengthLogic;
 
     private final MetaRobotsTag metaRobotsTag;
+    private final DocumentGeneratorExtractor documentGeneratorExtractor;
     private static final DocumentValuator documentValuator = new DocumentValuator();
 
     private static final LinkParser linkParser = new LinkParser();
@@ -69,7 +70,8 @@ public HtmlDocumentProcessorPlugin(
             SummaryExtractor summaryExtractor,
             PubDateSniffer pubDateSniffer,
             DocumentLengthLogic documentLengthLogic,
-            MetaRobotsTag metaRobotsTag) {
+            MetaRobotsTag metaRobotsTag,
+            DocumentGeneratorExtractor documentGeneratorExtractor) {
         this.documentLengthLogic = documentLengthLogic;
         this.minDocumentQuality = minDocumentQuality;
         this.sentenceExtractor = sentenceExtractor;
@@ -81,6 +83,7 @@ public HtmlDocumentProcessorPlugin(
         this.pubDateSniffer = pubDateSniffer;
         this.metaRobotsTag = metaRobotsTag;
 
+        this.documentGeneratorExtractor = documentGeneratorExtractor;
     }
 
     @Override
@@ -143,12 +146,15 @@ public DetailsWithWords createDetails(CrawledDomain crawledDomain, CrawledDocume
 
         ret.description = getDescription(doc, words.importantWords);
 
+        List<String> generatorParts = documentGeneratorExtractor.generatorCleaned(doc);
+
         var tagWords = new MetaTagsBuilder()
                 .addDomainCrawlData(crawledDomain)
                 .addPubDate(pubDate)
                 .addUrl(url)
                 .addFeatures(features)
                 .addFormat(standard)
+                .addGenerator(generatorParts)
                 .build();
 
         words.addAllSyntheticTerms(tagWords);