Allow for HTML checking to be loosened on /html/* routes

[Fdawgs]

Prerequisites

• I have written a descriptive title

• I have searched existing feature requests to ensure it has not already been proposed

• I agree to follow the Code of Conduct that this project adheres to

Description

A number of NHS trusts have documents stored as HTML that are malformed (missing closing tags etc.) that the underlying html-to-text dependency can still get text out of, but the content type checker parser rejects.

Either a query string param or env variable should/could be used to disable the strict checking in

docsmith/src/routes/html/txt/index.js

Lines 30 to 47 in d1b89d6

	server.addContentTypeParser(
	htmlToTxtPostSchema.consumes,
	{ parseAs: "string" },
	async (_req, payload) => {
	if (payload === "") {
	throw server.httpErrors.badRequest("Body cannot be empty");
	}
	/**
	* The Content-Type header can be spoofed so is not trusted implicitly,
	* this checks the payload is HTML.
	*/
	if (!isHtml(payload)) {
	throw server.httpErrors.unsupportedMediaType();
	}
	return payload;
	}
	);