Validate project name

[efekarakus]

Story

As a user that entered the project name to the ecs init prompt or flag,
I want the CLI to give me an error before it proceeds creating my resources,
So that I don't do additional wasted work before getting an error message.

Acceptance Criteria

• Has to be less than 255 characters

This is because a project's name will be used as a tag value which has to be < 255 chars. Note: I'm not sure what this means for unicode characters we might want to test this out.

• Must be alphanumeric (A-Za-z0-9)

We will use a combination of project name and application name to create the Logical ID of CFN resources. CFN has a restriction of alphanumeric ids.

• Must be unique within the account.

Check if the tool account already has a tag value set to project.

[efekarakus]

@kohidave Am I missing anything else for validation?

[sonofachamp]

• Must be unique within the account.
  Check if the tool account already has a tag value set to project.

I don't understand what tool account means.

• Is checking for uniqueness within an account a web service call?
• Would the check be against all resources or only a specific set of resources?

[kohidave]

tool account refers to the account that's hosting the project configuration and CodePipes. It's defined in the Cross Account CodePipeline Reference Architecture.

Checking uniqueness would involve calling SSM (depending on our project configuration choice).

@efekarakus - those are good first starts. I can't think of anything else off the top of my head.

[sonofachamp]

I've opened #19 to include basic validations and will open a separate issue to track uniqueness within a tool account scope work.