fingerprintjs

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import { getBrowserMajorVersion, isChromium, isGecko, isMobile, isSafari, isWebKit } from '../../tests/utils'
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import getAudioFingerprint, { getMiddle, SpecialFingerprint, stabilize } from './audio'
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describe('Sources', () => {
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  describe('audio', () => {
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    it('returns expected value', async () => {
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      const result = (await getAudioFingerprint())()
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      if (doesBrowserSuspendAudioContext()) {
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        expect(result).toBe(SpecialFingerprint.KnownForSuspending)
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      } else if (isGecko()) {
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        expect(result).toBeGreaterThan(0.000169)
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        expect(result).toBeLessThan(0.00017)
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      } else if (isWebKit()) {
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        if ('OfflineAudioContext' in window) {
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          expect(result).toBeGreaterThan(0.000058)
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          expect(result).toBeLessThan(0.000066)
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        } else {
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          expect(result).toBeGreaterThan(0.000113)
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          expect(result).toBeLessThan(0.000114)
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        }
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      } else if (isChromium()) {
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        expect(result).toBeGreaterThan(0.00006)
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        expect(result).toBeLessThan(0.00009)
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      } else {
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        throw new Error('Unexpected browser')
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      }
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    })
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    it('returns a stable value', async () => {
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      const finishFirst = await getAudioFingerprint()
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      const first = finishFirst()
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      const finishSecond = await getAudioFingerprint()
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      const second = finishSecond()
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      expect(first).toBe(second)
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      expect(finishFirst()).toBe(first)
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    })
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  })
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  describe('getMiddle helper', () => {
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    it('calculates properly and ignores zeros', () => {
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      const signal = [
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        0, -5.92384345, -3.39578492, -4.39564854, 0, -3.89384529, -8.92384234, -5.01429423, -4.12045834, -3.93298453, 0,
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      ]
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      expect(getMiddle(signal)).toEqual(-6.15981363)
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    })
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  })
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  describe('stabilize helper', () => {
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    it('calculates properly', () => {
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      expect(stabilize(0.000123456789, 2)).toBe(0.00012)
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      expect(stabilize(0.000000012345, 2)).toBe(0.000000012)
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      expect(stabilize(-0.000123456789, 2)).toBe(-0.00012)
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      expect(stabilize(0.000123456789, 7)).toBe(0.0001234568)
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      expect(stabilize(0.000123456789, 2.2)).toBe(0.000125)
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      expect(stabilize(0.000123456789, 2.5)).toBe(0.000124)
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      expect(stabilize(0.000123456789, 6.2)).toBe(0.000123457)
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      expect(stabilize(0.000123456789, 15.5)).toBe(0.000123456789)
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      expect(stabilize(0.000123456789, 5.2)).toBe(0.000123455)
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      expect(stabilize(0.000123456789, 5.5)).toBe(0.000123456)
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    })
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  })
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})
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function doesBrowserSuspendAudioContext() {
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  // WebKit has stopped telling its real version in the user-agent string since version 605.1.15,
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  // therefore the browser version has to be checked instead of the engine version.
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  return isSafari() && isMobile() && (getBrowserMajorVersion() ?? 0) < 12
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}
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