Creating a topic fails with unclear error message if topic name does not match rules

[mschroedercflt]

Code of Conduct

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

On what operating system are you seeing the problem?

No response

VS Code version

When creating a new topic, for example with a space in the name, the error message is not very clear. It reads: "Payload Error. Invalid topic name." but the rules for topic names are not evident anywhere.

Version of Confluent extension

No response

To Reproduce

1. Click "Create Topic"
2. Give invalid name
3. Accept defaults

Current vs. Expected behavior

I expected either:
A) the help text to provide the rules for what topic names look like
B) the error message to clarify the rules or specify the invalid character

Relevant log output

Which area(s) are affected? (Select all that apply)

Topics

Additional context

No response

[shouples]

We should use validateInput here like we do in the local Docker broker input box.

vscode/src/docker/workflows/confluent-local.ts

Lines 92 to 99 in a193db1

	const numContainersString: string | undefined = await window.showInputBox({
	title: "Start Confluent Local",
	prompt: "Enter the number of Kafka brokers to start (1-4)",
	placeHolder: "1",
	value: "1",
	ignoreFocusOut: true,
	validateInput: validateBrokerInput,
	});

vscode/src/docker/workflows/confluent-local.ts

Lines 383 to 393 in a193db1

	/** Validate the user's input for the number of brokers/containers to start. */
	export function validateBrokerInput(userInput: string): InputBoxValidationMessage | undefined {
	const num: number = parseInt(userInput, 10);
	if (isNaN(num) || num < 1 || num > 4) {
	return {
	message: "Please enter a number between 1 and 4 (inclusive)",
	severity: InputBoxValidationSeverity.Error,
	};
	}
	return;
	}

[jlrobins]

@mschroedercflt asserts that the authoritative regex is [a-zA-Z0-9\._-] max 249 characters as from the source code