Correct using createSha1Hash() with pipe()

[seaoak]

What does it do?

Fix errors of the issue #3818. (#3818 (comment))

Supersede the draft PR #4292.

With Node.js v10.x (not v12.x), npm test fails some times.
One of them is process() - skip (mtime changed but hash matched): as follows:

  1) Hexo
       Box
         Box
           process() - skip (mtime changed but hash matched):
     AssertError: expected spy to be called with match
[_File] {
  params: {  },
  path: "a.txt",
  source: "J:\00_Seaoak\hexo\test\scripts\box\box_tmp\test\a.txt",
  type: "update"
} { path: "a.txt", type: "skip" }
      at Object.fail (J:\00_Seaoak\hexo\node_modules\sinon\lib\sinon\assert.js:107:21)
      at failAssertion (J:\00_Seaoak\hexo\node_modules\sinon\lib\sinon\assert.js:66:16)
      at Object.assert.(anonymous function) [as calledWithMatch] (J:\00_Seaoak\hexo\node_modules\sinon\lib\sinon\assert.js:92:13)
      at Context.it (J:\00_Seaoak\hexo\test\scripts\box\box.js:160:17)

Another one of them is update theme source files: as follows:

  2) Hexo
       Console
         generate
           update theme source files:

      AssertionError: expected 'b' to deeply equal 'bb'
      + expected - actual

      -b
      +bb

      at Context.it (J:\00_Seaoak\hexo\test\scripts\console\generate.js:207:22)

This patch fixes these errors.

I found that a combination Stream.readable.pipe() and Crypt.createHash() causes this error.
As shown by the @segayuu 's comment (#4292 (comment)),
Hash#digest() can not be used in the finish event of Hash#pipe().

This patch uses the data event of Hash#pipe() to get hash buffer,
and uses Buffer#toString('hex') to get digest value from the buffer.

How to test

nvm use 10.20.1
git clone -b correct_using_createSha1Hash_with_pipe https://github.com/seaoak/hexo.git
cd hexo
npm install
npm test

Pull request tasks

• Add test cases for the changes.
• Passed the CI test.

[coveralls]

Coverage increased (+0.001%) to 97.745% when pulling b362ac4 on seaoak:correct_using_createSha1Hash_with_pipe into 378c22b on hexojs:master.

[SukkaW]

LGTM!

[segayuu]

LGTM!

[joseyusunsuaira]

Buenas noches profesor

trabajo de
jose favian yusunguaira
carlos felipe amaya
juan diego aragonez
erick felipe carvajal
jhonatan murcia

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