fix(gatsby): added looksLikeADate to check date on schema creation

packages/gatsby/src/schema/infer/example-value.js

@@ -1,6 +1,6 @@
 const _ = require(`lodash`)
 const is32BitInteger = require(`./is-32-bit-integer`)
-const { isDate } = require(`../types/date`)
+const { looksLikeADate } = require(`../types/date`)
 
 const getExampleValue = ({
   nodes,
@@ -168,7 +168,7 @@ const getType = value => {
     case `number`:
       return `number`
     case `string`:
-      return isDate(value) ? `date` : `string`
+      return looksLikeADate(value) ? `date` : `string`
     case `boolean`:
       return `boolean`
     case `object`:

packages/gatsby/src/schema/types/__tests__/date.js

@@ -1,6 +1,6 @@
 const { store } = require(`../../../redux`)
 const { build } = require(`../..`)
-const { isDate } = require(`../date`)
+const { isDate, looksLikeADate } = require(`../date`)
 require(`../../../db/__tests__/fixtures/ensure-loki`)()
 
 // Timestamps grabbed from https://github.com/moment/moment/blob/2e2a5b35439665d4b0200143d808a7c26d6cd30f/src/test/moment/is_valid.js
@@ -152,6 +152,132 @@ describe(`isDate`, () => {
   })
 })
 
+describe(`looksLikeADate`, () => {
+  it.each([
+    `1970`,
+    `2019`,
+    `1970-01`,
+    `2019-01`,
+    `1970-01-01`,
+    `2010-01-01`,
+    `2010-01-30`,
+    `19700101`,
+    `20100101`,
+    `20100130`,
+    `2010-01-30T23+00:00`,
+    `2010-01-30T23:59+00:00`,
+    `2010-01-30T23:59:59+00:00`,
+    `2010-01-30T23:59:59.999+00:00`,
+    `2010-01-30T23:59:59.999-07:00`,
+    `2010-01-30T00:00:00.000+07:00`,
+    `2010-01-30T23:59:59.999-07`,
+    `2010-01-30T00:00:00.000+07`,
+    `2010-01-30T23Z`,
+    `2010-01-30T23:59Z`,
+    `2010-01-30T23:59:59Z`,
+    `2010-01-30T23:59:59.999Z`,
+    `2010-01-30T00:00:00.000Z`,
+    `1970-01-01T00:00:00.000001Z`,
+    `2012-04-01T00:00:00-05:00`,
+    `2012-11-12T00:00:00+01:00`,
+  ])(`should return true for valid ISO 8601: %s`, dateString => {
+    expect(looksLikeADate(dateString)).toBeTruthy()
+  })
+
+  it.each([
+    `2010-01-30 23+00:00`,
+    `2010-01-30 23:59+00:00`,
+    `2010-01-30 23:59:59+00:00`,
+    `2010-01-30 23:59:59.999+00:00`,
+    `2010-01-30 23:59:59.999-07:00`,
+    `2010-01-30 00:00:00.000+07:00`,
+    `2010-01-30 23:59:59.999-07`,
+    `2010-01-30 00:00:00.000+07`,
+    `1970-01-01 00:00:00.000Z`,
+    `2012-04-01 00:00:00-05:00`,
+    `2012-11-12 00:00:00+01:00`,
+    `1970-01-01 00:00:00.0000001 Z`,
+    `1970-01-01 00:00:00.000 Z`,
+    `1970-01-01 00:00:00 Z`,
+    `1970-01-01 000000 Z`,
+    `1970-01-01 00:00 Z`,
+    `1970-01-01 00 Z`,
+  ])(`should return true for ISO 8601 (no T, extra space): %s`, dateString => {
+    expect(looksLikeADate(dateString)).toBeTruthy()
+  })
+
+  it.each([`1970-W31`, `2006-W01`, `1970W31`, `2009-W53-7`, `2009W537`])(
+    `should return true for ISO 8601 week dates: %s`,
+    dateString => {
+      expect(looksLikeADate(dateString)).toBeTruthy()
+    }
+  )
+
+  it.each([`1970-334`, `1970334`, `2090-001`, `2090001`])(
+    `should return true for ISO 8601 ordinal dates: %s`,
+    dateString => {
+      expect(looksLikeADate(dateString)).toBeTruthy()
+    }
+  )
+
+  it.skip.each([
+    `2018-08-31T23:25:16.019345+02:00`,
+    `2018-08-31T23:25:16.019345Z`,
+  ])(`should return true for microsecond precision: %s`, dateString => {
+    expect(looksLikeADate(dateString)).toBeTruthy()
+  })
+
+  it.skip.each([
+    `2018-08-31T23:25:16.019345123+02:00`,
+    `2018-08-31T23:25:16.019345123Z`,
+  ])(`should return true for nanosecond precision: %s`, dateString => {
+    expect(looksLikeADate(dateString)).toBeTruthy()
+  })
+
+  it.skip.each([`2018-08-31T23:25:16.012345678901+02:00`])(
+    `should return false for precision beyond 9 digits: %s`,
+    dateString => {
+      expect(looksLikeADate(dateString)).toBeFalsy()
+    }
+  )
+
+  it.each([
+    `2010-00-00`,
+    `2010-01-00`,
+    `2010-01-40`,
+    `2010-01-01T24:01`, // 24:00:00 is actually valid
+    `2010-01-40T24:01+00:00`,
+    `2010-01-01T23:60`,
+    `2010-01-01T23:59:60`,
+    `2010-01-40T23:60+00:00`,
+    `2010-01-40T23:59:60+00:00`,
+  ])(`should return true for some valid ISO 8601: %s`, dateString => {
+    expect(looksLikeADate(dateString)).toBeTruthy()
+  })
+
+  it.each([
+    `2010-01-40T23:59:59.9999`,
+    `2010-01-40T23:59:59.9999+00:00`,
+    `2010-01-40T23:59:59,9999+00:00`,
+    `2010-00-00T+00:00`,
+    `2010-01-00T+00:00`,
+    `2010-01-40T+00:00`,
+    `2012-04-01T00:00:00-5:00`, // should be -05:00
+    `2012-04-01T00:00:00+1:00`, // should be +01:00
+    undefined,
+    `undefined`,
+    null,
+    `null`,
+    [],
+    {},
+    ``,
+    ` `,
+    `2012-04-01T00:basketball`,
+  ])(`should return false for invalid ISO 8601: %s`, dateString => {
+    expect(looksLikeADate(dateString)).toBeFalsy()
+  })
+})
+
 const nodes = [
   {
     id: `id1`,

packages/gatsby/src/schema/types/date.js

@@ -96,16 +96,96 @@ const GraphQLDate = new GraphQLScalarType({
   },
 })
 
-// Check if this is a date.
-// All the allowed ISO 8601 date-time formats used.
-function isDate(value) {
+const momentFormattingTokens = /(\[[^[]*\])|(\\)?([Hh]mm(ss)?|Mo|MM?M?M?|Do|DDDo|DD?D?D?|ddd?d?|do?|w[o|w]?|W[o|W]?|Qo?|YYYYYY|YYYYY|YYYY|YY|gg(ggg?)?|GG(GGG?)?|e|E|a|A|hh?|HH?|kk?|mm?|ss?|S{1,9}|x|X|zz?|ZZ?|.)/g
+const momentFormattingRegexes = {
+  YYYY: `\\d{4}`,
+  MM: `\\d{2}`,
+  DD: `\\d{2}`,
+  DDDD: `\\d{4}`,
+  HH: `\\d{2}`,
+  mm: `\\d{2}`,
+  ss: `\\d{2}`,
+  SSS: `\\d{3}`,
+  SSSSSS: `\\d{6}`,
+  E: `\\d`,
+  W: `\\d`,
+  WW: `\\d{2}`,
+  "[W]": `W`,
+  ".": `\\.`,
+  Z: `(Z|[+-]\\d\\d(?::?\\d\\d)?)`,
+}
+const ISO_8601_FORMAT_AS_REGEX = ISO_8601_FORMAT.map(format =>
+  // convert ISO string to a map of momentTokens ([YYYY, MM, DD])
+  [...format.match(momentFormattingTokens)]
+    .map(token =>
+      // see if the token (YYYY or ss) is found, else we just return the value
+      momentFormattingRegexes[token] ? momentFormattingRegexes[token] : token
+    )
+    .join(``)
+).join(`|`)
+
+// calculate all lengths of the formats, if a string is longer or smaller it can't be valid
+const ISO_8601_FORMAT_LENGTHS = [
+  ...new Set(
+    ISO_8601_FORMAT.reduce((acc, val) => {
+      if (!val.endsWith(`Z`)) {
+        return acc.concat(val.length)
+      }
+
+      // we add count of +01 & +01:00
+      return acc.concat([val.length, val.length + 3, val.length + 5])
+    }, [])
+  ),
+]
+
+// lets imagine these formats: YYYY-MM-DDTHH & YYYY-MM-DD HHmmss.SSSSSS Z
+// this regex looks like (/^(\d{4}-\d{2}-\d{2}T\d{2}|\d{4}-\d{2}-\d{2} \d{2}\d{2}\d{2}.\d{6} Z)$)
+const quickDateValidateRegex = new RegExp(`^(${ISO_8601_FORMAT_AS_REGEX})$`)
+
+const looksLikeDateStartRegex = /^\d{4}/
+// this regex makes sure the last characters are a number or the letter Z
+const looksLikeDateEndRegex = /(\d|Z)$/
+
+/**
+ * looksLikeADate isn't a 100% valid check if it is a real date but at least it's something that looks like a date.
+ * It won't catch values like 2010-02-30
+ * 1) is it a number?
+ * 2) does the length of the value comply with any of our formats
+ * 3) does the str starts with 4 digites (YYYY)
+ * 4) does the str ends with something that looks like a date
+ * 5) Small regex to see if it matches any of the formats
+ * 6) check momentjs
+ *
+ * @param {*} value
+ * @return {boolean}
+ */
+function looksLikeADate(value) {
   // quick check if value does not look like a date
-  if (typeof value === `number` || !/^\d{4}/.test(value)) {
+  if (
+    !value ||
+    (value.length && !ISO_8601_FORMAT_LENGTHS.includes(value.length)) ||
+    !looksLikeDateStartRegex.test(value) ||
+    !looksLikeDateEndRegex.test(value)
+  ) {
     return false
   }
 
+  // If it looks like a date we parse the date with a regex to see if we can handle it.
+  // momentjs just does regex validation itself if you don't do any operations on it.
+  if (typeof value === `string` && quickDateValidateRegex.test(value)) {
+    return true
+  }
+
+  return isDate(value)
+}
+
+/**
+ * @param {*} value
+ * @return {boolean}
+ */
+function isDate(value) {
   const momentDate = moment.utc(value, ISO_8601_FORMAT, true)
-  return momentDate.isValid()
+  return typeof value !== `number` && momentDate.isValid()
 }
 
 const formatDate = ({
@@ -175,4 +255,4 @@ const dateResolver = {
   },
 }
 
-module.exports = { GraphQLDate, dateResolver, isDate }
+module.exports = { GraphQLDate, dateResolver, isDate, looksLikeADate }