overly aggressive restriction on bundle identifiers restricts my idiom

[glyph]

Describe the bug

All my apps have bundle IDs of the form im.glyph.and.this.is.<app name> but that doesn't work with briefcase new, due to this error:

Bundle Identifier [com.example]: im.glyph.and.this.is.examplecase

Invalid value; 'im.glyph.and.this.is.examplecase' is not a valid bundle identifier.

The bundle should be a reversed domain name. It must contain at least 2
dot-separated sections; each section may only include letters, numbers,
and hyphens; and each section may not contain any reserved words (like
'switch', or 'while').

Steps to reproduce

Just run briefcase new and use the aforementioned bundle id.

Expected behavior

It accepts the input.

Screenshots

No response

Environment

• Operating System: ```
  ProductName: macOS
  ProductVersion: 13.3.1
  BuildVersion: 22E261

- Python version: Python 3.11.3
- Software versions:
  - Briefcase: 0.3.14


### Logs

### Additional context

_No response_

[freakboy3742]

This seems like over-enthusiastic validation catching the and, is, and this keywords.

We need to confirm the exact validation scheme that is being used on bundle IDs. We added keywords to the list because of complications with Java namespaces on Android (specifically the switch keyword, IIRC).

[Cimbali]

It seems io falls into this as well. where https://${project}.github.io/ are often used for project github pages, which makes io.github.${project} a natural candidate for bundle identifier. It seems to be prohibited because io is a python package, but I’m not sure under what circumstances python packages and bundle identifiers could be confused?

[freakboy3742]

@Cimbali Thanks for the heads up on that one - definitely looks like we should relax the validation for the parts the bundle identifier. We're currently doing the same validation on each individual part of the bundle identifier, mostly out of simplicity than out of any specific concern. Clearly we are able to relax the name checks on all but the last token (which is the app name, and is therefore critical that it doesn't collide).

[mas192]

bundle application identifiers restrict ca (Canada) too.

[mhsmith]

In this case I think it's test rather than ca, because test is the standard library's self-test module. However, as mentioned above, this check should only be done on the app's Python package name, not every element in the bundle ID.

[mas192]

I have requested a PR to address this issue
#1824

[freakboy3742]

This wasn't actually fixed by #1819 - the text of PR comment triggered Github's auto closer.

[glyph]

Aww. Well thanks for the work regardless :)

[freakboy3742]

@glyph Oh - there's a fix about to land - just waiting for CI.