feat(pipes): parse date pipe

Author: ggurkal

lib/pipes/parseDate.pipe.ts

@@ -0,0 +1,54 @@
+import { BadRequestException } from '../exceptions';
+import type { PipeMetadata, PipeOptions } from './ParameterPipe';
+import { validatePipeOptions } from './validatePipeOptions';
+
+// The following variables and functions are taken from the validator.js (https://github.com/validatorjs/validator.js/blob/master/src/lib/isISO8601.js)
+
+// from http://goo.gl/0ejHHW
+const iso8601 = /^([+-]?\d{4}(?!\d{2}\b))((-?)((0[1-9]|1[0-2])(\3([12]\d|0[1-9]|3[01]))?|W([0-4]\d|5[0-3])(-?[1-7])?|(00[1-9]|0[1-9]\d|[12]\d{2}|3([0-5]\d|6[1-6])))([T\s]((([01]\d|2[0-3])((:?)[0-5]\d)?|24:?00)([.,]\d+(?!:))?)?(\17[0-5]\d([.,]\d+)?)?([zZ]|([+-])([01]\d|2[0-3]):?([0-5]\d)?)?)?)?$/;
+// same as above, except with a strict 'T' separator between date and time
+const iso8601StrictSeparator = /^([+-]?\d{4}(?!\d{2}\b))((-?)((0[1-9]|1[0-2])(\3([12]\d|0[1-9]|3[01]))?|W([0-4]\d|5[0-3])(-?[1-7])?|(00[1-9]|0[1-9]\d|[12]\d{2}|3([0-5]\d|6[1-6])))([T]((([01]\d|2[0-3])((:?)[0-5]\d)?|24:?00)([.,]\d+(?!:))?)?(\17[0-5]\d([.,]\d+)?)?([zZ]|([+-])([01]\d|2[0-3]):?([0-5]\d)?)?)?)?$/;
+
+const isValidDate = (str: string) => {
+  // str must have passed the ISO8601 check
+  // this check is meant to catch invalid dates
+  // like 2009-02-31
+  const match = (str.match(/(\d{4})-?(\d{0,2})-?(\d*)/) ?? []).map(Number);
+  const year = match[1];
+  const month = match[2];
+  const day = match[3];
+  const monthString = month ? `0${month}`.slice(-2) : month;
+  const dayString = day ? `0${day}`.slice(-2) : day;
+
+  // create a date object and compare
+  const d = new Date(`${year}-${monthString || '01'}-${dayString || '01'}`);
+  if (month && day) {
+    return d.getUTCFullYear() === year && d.getUTCMonth() + 1 === month && d.getUTCDate() === day;
+  }
+
+  return true;
+};
+
+function isISO8601(str: string, options: { strictSeparator?: boolean; strict?: boolean } = {}) {
+  const check = options.strictSeparator ? iso8601StrictSeparator.test(str) : iso8601.test(str);
+
+  if (check && options.strict) {
+    return isValidDate(str);
+  }
+
+  return check;
+}
+
+export function ParseDatePipe(options?: PipeOptions) {
+  return (value: any, metadata?: PipeMetadata) => {
+    validatePipeOptions(value, metadata?.name, options);
+
+    if (value && !isISO8601(value, { strict: true })) {
+      throw new BadRequestException(
+        `Validation failed${metadata?.name ? ` for ${metadata.name}` : ''} (date string is expected)`
+      );
+    }
+
+    return new Date(value);
+  };
+}