Restrict allowed characters in connection ids

[BasPH]

Description

I bumped into a bug where a connection id was suffixed with a whitespace e.g. "myconn ". When referencing the connection id "myconn" (without whitespace), you get a connection not found error.

To avoid such human errors, I suggest restricting the characters allowed for connection ids.

Some suggestions:

• There's an airflow.utils.helpers.validate_key function for validating the DAG id. Probably a good idea to reuse this.
• I believe variable ids are also not validated, would be good to check those too.

Use case/motivation

No response

Related issues

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[josh-fell]

Good idea! All yours @BasPH!

[potiuk]

Yep.