Add --show-encryption

[Sparticuz]

Fixes #30

[azymnis]

Thank you! Added some comments to this

[azymnis]

As a start we could show whether the file is encrypted or not

Suggested change

	/**
	* Gets the encryption info for a PDF
	* @param payload The settings for info
	* @returns The output of QPDF
	*/
	export const info = async (payload: InfoSettings): Promise<Buffer> => {
	export interface InfoOutput {
	isEncrypted: boolean;
	}
	/**
	* Gets the encryption info for a PDF
	* @param payload The settings for info
	* @returns The output of QPDF
	*/
	export const info = async (payload: InfoSettings): Promise<InfoOutput> => {

[azymnis]

I think here it would be enough to extract the : params.

I have not tested the following snippet but it might do the trick:

Suggested change

	return execute(callArguments);
	const outputParams = _.keyBy(
	(await execute(callArguments))
	.toString('utf8')
	.split('\n')
	.map(line => line.split(':').map(k => k.trim()).splice(0, 2)),
	p => p[0]
	);
	const isEncrypted = outputParams['Has user password'] === 'yes' || outputParams['Has owner password'] === 'yes';
	return { isEncrypted };

[Sparticuz]

For now, I just left it as the string that qpdf returns. For an unencrypted file, the result will be 'File is not encrypted'.

(await info(filePath)) === "File is not encrypted" should give you a boolean

[azymnis]

Awesome that works great, thank you