Top-Helper message length exploit

[Nxllpointer]

Describe the bug
You can easily farm Top-Helper message points by adding thousands of Zero Width Joiners (invisible characters) to your help messages and boost yourself up the Top-Helper list.

Expected behavior
Unwanted characters should not increase the message points

To Reproduce

1. Go to https://emojipedia.org/zero-width-joiner/ and copy the character
2. Write a help message and add the character until you reach the message limit
3. Take a look at the help_channel_messages database table
4. => The message length is 2000

Screenshots

after a few messages

Fix

We can just adjust the value put into the database at TopHelpersMessageListener:

to not use just .length(), but ignore any fancy character. It is probably okay if we just count a-zA-Z0-9 or similar.

[Zabuzard]

Lmao. Note that, if we detect such exploits, we will warn the user and ignore them for the award.

The giveaway is a semi-manual process for a reason. But yeah, I am fine with blocking any non a-zA-Z0-9 character for the counter.

[Nxllpointer]

Already done. I blocked all charachters that arent in the range of 0x20 to 0x7E. https://www.ascii-code.com/

[Zabuzard]

@Nxllpointer please dont remove the tags, thanks

[Nxllpointer]

Uh ok. So what does help-wanted mean if help isnt needed?

[Zabuzard]

@Nxllpointer help was needed for this. this is a beginner issue. until u assigned urself and fixed it. now its closed, so its not listed anywhere anymore. but for the record, it was a beginner-friendly issue.

[Nxllpointer]

At the time of removing the tag i was already assigned and had the issue fixed. I would not randomly remove tags of unresolved issues.