Use Case

As a... user of the connection string parser
I want... connection strings with unescaped reserved characters in userinfo (especially an unescaped `@` in the password) to be rejected
So that... invalid uris do not parse successfully

User Experience

• Correct validation behavior for malformed connections
• a string like `mongodb+srv://user@ss@localhost/` will result in an exception
• this is a bug in the node driver (connection string parsing package)

Dependencies

• upstream, COMPASS-10688 depends on this work

Risks/Unknowns

• Main risk is changing parsing too broadly while fixing unescaped character handling
• Other drivers may also have this issue
• We were notified about this because COMPASS uses our driver

Acceptance Criteria

Implementation Requirements

• connection string parsing is updated and throws appropriate errors when unescaped `@` and similar reserved characters are present in userinfo
• existing tests pass
• new tests pass

Testing Requirements

• add more test cases to parsing tests, ensure unescaped `@` is handled properly

Documentation Requirements

• none

Follow Up Requirements

• none