import { ObjectId } from 'mongodb';

// This is trivial, but makes it simple to refactor if we swap monogodb for

// bson, say.

/**

* Checks if a string is a valid MongoDB ObjectID.

* @param id A string to check.

* @returns A boolean indicating if the string is a valid MongoDB ObjectID.

*/

export const isObjectID = (id?: string): boolean =>

id ? ObjectId.isValid(id) : false;

// Refer : http://stackoverflow.com/a/430240/1932901

/**

* Sanitizes a input by removing HTML tags.

* @deprecated

* @param value A string to sanitize.

* @returns A string with HTML tags removed.

*/

export const trimTags = (value: string): string => {

const tagBody = '(?:[^"\'>]|"[^"]*"|\'[^\']*\')*';

const tagOrComment = new RegExp(

'<(?:' +

// Comment body.

'!--(?:(?:-*[^->])*--+|-?)' +

// Special "raw text" elements whose content should be elided.

'|script\\b' +

tagBody +

'>[\\s\\S]*?</script\\s*' +

'|style\\b' +

tagBody +

'>[\\s\\S]*?</style\\s*' +

// Regular name

'|/?[a-z]' +

tagBody +

')>',

'gi'

);

let rawValue;

do {

rawValue = value;

value = value.replace(tagOrComment, '');

} while (value !== rawValue);

return value.replace(/</g, '&lt;');

};