Email subject with square bracket creates page that errors on access

[OzWookiee]

Version:
Type: Bug

---

Description

We have emails coming in from our status page (status.aroflo.com) and they have a title in subject line with square brackets. This then creates a page title of same which causes Server 400 errors:
https://help.aroflo.com/display/COM/2019/03/09/Status+Update%3A+%5BComplete%5D+Planned+Maintenance

Steps to reproduce

1. Setup to create blog posts from email
2. Send email with subject line: "Status Update: [Complete] Planned Maintenance"
3. Review list of blog posts and confirm that the page lists correctly
4. Click on link

Expected Behavior

//Should create a page title that is valid for use in URL and does not through server 400 errors when accessed

Actual Behavior

// Creates page title that is invalid for use in URL and does through server 400 errors when accessed

Can also repro by creating a blog post with title: "Status Update: [Complete] Planned Maintenance"

[OzWookiee]

This may be a bug with Confluence itself, but guessing it's going to be easier to get this plugin updated instead of a bug in Confluence itself 🤦

[OzWookiee]

PS this is a VERY handy tool!

[OzWookiee]

Not knowing java that well but //guessing// that it would be a gsub prior to or in line 100 of:
https://github.com/dm-drogeriemarkt/Email-to-Confluence/blob/master/src/main/java/de/dm/mail2blog/MessageToContentProcessor.java

 // Set the title.
page.setTitle(generateTitle(message, page));