Dominik Stadler created EMAIL-127:
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Summary: ImageHtmlEmail: Dollar or Backslash in certain places in
<img ... src...>-tags causes exceptions "IllegalArgumentException: Illegal
group reference"
Key: EMAIL-127
URL: https://issues.apache.org/jira/browse/EMAIL-127
Project: Commons Email
Issue Type: Bug
Affects Versions: 1.3.1
Environment: Linux
Reporter: Dominik Stadler
Priority: Blocker
I have a unit test which shows that dollar sign and backslash cause
ImageHtmlEmail to throw an Exception (unfortunately not easy to provide a
complete unit test, but it should be easy to enhance one of the existing tests
for ImageHtmlEmail):
{quote}
FileUtils.writeStringToFile(file, "<html>teststring
<img title=\"$\" src=\"file://" + file.getAbsolutePath() + "\"/></html>");
sender.sendHTMLEmail(files, mailConfig, emailConfig,
REPORT_DIR);
{quote}
It will throw the following Exception:
{quote}
java.lang.IllegalArgumentException: Illegal group reference
at java.util.regex.Matcher.appendReplacement(Matcher.java:808)
at
org.apache.commons.mail.ImageHtmlEmail.replacePattern(ImageHtmlEmail.java:180)
at
org.apache.commons.mail.ImageHtmlEmail.buildMimeMessage(ImageHtmlEmail.java:103)
at org.apache.commons.mail.Email.send(Email.java:1427)
at EmailSender.sendHTMLEmail(EmailSender.java:93)
at
EmailSenderTest.testImageHtmlEmailDollarBackslash(EmailSenderTest.java:801)
{quote}
the cause is that Matcher.appendReplacement() actually treats Dollar and
Backslash as special characters. From the javadoc of Matcher:
{quote}
* Note that backslashes (<tt>\</tt>) and dollar signs (<tt>$</tt>) in
* the replacement string may cause the results to be different than if it
* were being treated as a literal replacement string. Dollar signs may be
* treated as references to captured subsequences as described above, and
* backslashes are used to escape literal characters in the replacement
* string.
{quote}
A possible fix is to replace line 180 of ImageHtmlEmail.java with the
following, i.e. replace "$" by "\$" and "\" by "\\" to have them properly
escaped.
{code}
matcher.appendReplacement(stringBuffer, (matcher.group(1) + "cid:" + cid +
matcher.group(3)).replace("$", "\\$").replace("\\", "\\\\"));
{code}
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