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only create links for trusted href values #242

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only create links for trusted href values #242

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9 changes: 8 additions & 1 deletion citeproc-java/src/main/java/de/undercouch/citeproc/csl/internal/format/HtmlFormat.java
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@
import org.apache.commons.text.StringEscapeUtils;

import java.util.List;
import java.util.Locale;

import static de.undercouch.citeproc.csl.internal.behavior.FormattingAttributes.FS_ITALIC;
import static de.undercouch.citeproc.csl.internal.behavior.FormattingAttributes.FW_BOLD;
Expand Down Expand Up @@ -58,7 +59,13 @@ protected String doFormatBibliographyEntry(TokenBuffer buffer,

@Override
protected String doFormatLink(String text, String uri) {
return "<a href=\"" + uri + "\">" + text + "</a>";
String uriLowerCase = uri.toLowerCase(Locale.ENGLISH);
if (uriLowerCase.startsWith("http://")
|| uriLowerCase.startsWith("https://")
|| uriLowerCase.startsWith("/")) {
return "<a href=\"" + uri + "\">" + text + "</a>";
}
return text;
}

@Override
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