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Code Issues Releases Wiki Activity

Pretty print received headers

This commit is contained in:
M66B 2021-06-15 15:15:03 +02:00
parent 13adf983b0
commit 39fec59875
1 changed files with 57 additions and 1 deletions
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58
app/src/main/java/eu/faircode/email/HtmlHelper.java
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@ -89,12 +89,15 @@ import org.w3c.dom.css.CSSRuleList;
import org.w3c.dom.css.CSSStyleSheet;
import org.w3c.dom.stylesheets.MediaList;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.text.DateFormat;
import java.text.ParsePosition;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
@ -107,6 +110,10 @@ import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.mail.internet.InternetHeaders;
import javax.mail.internet.MailDateFormat;
import javax.mail.internet.MimeUtility;
import static androidx.core.text.HtmlCompat.TO_HTML_PARAGRAPH_LINES_INDIVIDUAL;
import static org.w3c.css.sac.Condition.SAC_CLASS_CONDITION;
@ -1961,8 +1968,9 @@ public class HtmlHelper {
}
static Spanned highlightHeaders(Context context, String headers) {
int colorAccent = Helper.resolveColor(context, android.R.attr.textColorLink);
SpannableStringBuilder ssb = new SpannableStringBuilder(headers);
int colorAccent = Helper.resolveColor(context, android.R.attr.textColorLink);
int index = 0;
for (String line : headers.split("\n")) {
if (line.length() > 0 && !Character.isWhitespace(line.charAt(0))) {
@ -1972,6 +1980,54 @@ public class HtmlHelper {
}
index += line.length() + 1;
}
try {
// https://datatracker.ietf.org/doc/html/rfc2821#section-4.4
final List<String> words = Collections.unmodifiableList(Arrays.asList(
"from", "by", "via", "with", "id", "for"));
final DateFormat DTF = Helper.getDateTimeInstance(context, DateFormat.SHORT, DateFormat.MEDIUM);
ByteArrayInputStream bis = new ByteArrayInputStream(headers.getBytes());
String[] received = new InternetHeaders(bis).getHeader("Received");
if (received.length > 0) {
ssb.append('\n');
for (int i = received.length - 1; i >= 0; i--) {
String h = MimeUtility.unfold(received[i]);
int semi = h.lastIndexOf(';');
Date date = null;
if (semi > 0) {
MailDateFormat mdf = new MailDateFormat();
date = mdf.parse(h, new ParsePosition(semi + 1));
h = h.substring(0, semi);
}
int s = ssb.length();
ssb.append('#').append(Integer.toString(received.length - i));
if (date != null)
ssb.append(' ').append(DTF.format(date));
ssb.setSpan(new StyleSpan(Typeface.BOLD), s, ssb.length(), 0);
ssb.append('\n');
int j = 0;
String[] w = h.split("\\s+");
while (j < w.length) {
if (j > 0)
ssb.append(' ');
s = ssb.length();
ssb.append(w[j]);
if (words.contains(w[j].toLowerCase(Locale.ROOT)))
ssb.setSpan(new ForegroundColorSpan(colorAccent), s, ssb.length(), 0);
j++;
}
ssb.append("\n\n");
}
}
} catch (Throwable ex) {
Log.w(ex);
}
return ssb;
}