[web]implement in-house sha1 hash function (#18651)

* implement in-house sha1 hash function * add comment * add test description Co-authored-by: Antoine Clausse <antoine.clausse@overleaf.com> * add more tests * dedupe test strings and remove unneeded toString calls --------- Co-authored-by: Antoine Clausse <antoine.clausse@overleaf.com> GitOrigin-RevId: aa3f5ab3ff412696c715521381eebf176f503197
2026-11-14 22:23:42 +01:00 · 2024-06-05 08:03:42 +00:00
parent a9cc32e6ed
commit 4101f4efeb
6 changed files with 227 additions and 9 deletions
@@ -0,0 +1,80 @@
+import { expect } from 'chai'
+
+import { generateSHA1Hash } from '../../../../frontend/js/shared/utils/sha1'
+
+function generateRandomString(length) {
+  const characters =
+    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
+  let result = ''
+  const charactersLength = characters.length
+  for (let i = 0; i < length; i++) {
+    result += characters.charAt(Math.floor(Math.random() * charactersLength))
+  }
+  return result
+}
+
+function generateMultipleRandomStrings(numStrings, maxLength) {
+  const randomStrings = []
+  for (let i = 0; i < numStrings; i++) {
+    const length = Math.floor(Math.random() * maxLength)
+    randomStrings.push(generateRandomString(length))
+  }
+  return [...new Set(randomStrings)]
+}
+
+describe('sha1', function () {
+  describe('generateSHA1Hash', function () {
+    const strings = generateMultipleRandomStrings(100, 1000)
+
+    it('generates 40 base16 characters', function () {
+      for (const str of strings)
+        expect(generateSHA1Hash(str)).to.match(/^[\da-f]{40}$/)
+    })
+
+    it("doesn't have collisions on a small set", function () {
+      expect(new Set(strings.map(generateSHA1Hash)).size).to.equal(
+        strings.length
+      )
+    })
+
+    it('sample string 1', function () {
+      expect(generateSHA1Hash('sample string 1')).to.equal(
+        '135028161629af5901ea2f15554730dc0de38a01'
+      )
+    })
+
+    it('sample string 2', function () {
+      expect(generateSHA1Hash('sample string 2')).to.equal(
+        'db9460374e49a7c737b609c2fb37302381f345d6'
+      )
+    })
+
+    it('abc', function () {
+      expect(generateSHA1Hash('abc')).to.equal(
+        'a9993e364706816aba3e25717850c26c9cd0d89d'
+      )
+    })
+
+    it('generates a sha1 for an empty string', function () {
+      expect(generateSHA1Hash('')).to.equal(
+        'da39a3ee5e6b4b0d3255bfef95601890afd80709'
+      )
+    })
+
+    it('abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq', function () {
+      expect(
+        generateSHA1Hash(
+          'abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq'
+        )
+      ).to.equal('84983e441c3bd26ebaae4aa1f95129e5e54670f1')
+    })
+
+    it('abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu', function () {
+      expect(
+        generateSHA1Hash(
+          'abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu'
+        )
+      ).to.equal('a49b2446a02c645bf419f995b67091253a04a259')
+    })
+  })
+})