feat(gz & br): support custom compression level

lib/filter.js

@@ -136,6 +136,8 @@ function gzipFn () {
   const { route } = hexo
   const routeList = route.list()
   const { globOptions, include } = options
+  let { level } = options
+  if (typeof level !== 'number') level = zlib.constants.Z_BEST_COMPRESSION
 
   let includeString = include || ''
   if (include && Array.isArray(include)) includeString = include.join('')
@@ -151,7 +153,7 @@ function gzipFn () {
           try {
             // TODO: Drop Buffer
             const input = Buffer.from(assetTxt, 'utf-8')
-            const result = await gzip(input, { level: zlib.constants.Z_BEST_COMPRESSION })
+            const result = await gzip(input, { level })
             if (options.logger) verbose.call(this, input, result, path, 'gzip')
             resolve(route.set(path + '.gz', result))
           } catch (err) {
@@ -171,6 +173,8 @@ function brotliFn () {
   const { route } = hexo
   const routeList = route.list()
   const { globOptions, include } = options
+  let { level } = options
+  if (typeof level !== 'number') level = zlib.constants.BROTLI_MAX_QUALITY
 
   let includeString = include || ''
   if (include && Array.isArray(include)) includeString = include.join('')
@@ -185,7 +189,7 @@ function brotliFn () {
         if (assetTxt.length) {
           try {
             const input = Buffer.from(assetTxt, 'utf-8')
-            const result = await br(input)
+            const result = await br(input, { params: { [zlib.constants.BROTLI_PARAM_QUALITY]: level } })
             if (options.logger) verbose.call(this, input, result, path, 'brotli')
             resolve(route.set(path + '.br', result))
           } catch (err) {

test/filter.test.js

@@ -422,6 +422,43 @@ describe('gzip', () => {
     expect(result).toBeUndefined()
   })
 
+  test('option', async () => {
+    const customOpt = {
+      level: 1
+    }
+    hexo.config.minify.gzip.level = customOpt.level
+    await g()
+
+    const output = hexo.route.get(path.concat('.gz'))
+    const buf = []
+    output.on('data', (chunk) => (buf.push(chunk)))
+    output.on('end', async () => {
+      const result = Buffer.concat(buf)
+      const expected = await gzip(input, customOpt)
+
+      expect(result.toString('base64')).toBe(Buffer.from(expected, 'binary').toString('base64'))
+    })
+  })
+
+  test('option - invalid', async () => {
+    const customOpt = {
+      level: 9000
+    }
+    hexo.config.minify.gzip.level = customOpt.level
+
+    let expected
+    try {
+      await gzip(input, customOpt)
+    } catch (err) {
+      expected = err.message
+    }
+    try {
+      await g()
+    } catch (err) {
+      expect(err.message).toContain(expected)
+    }
+  })
+
   test('include - exclude non-text file by default', async () => {
     const path = 'foo.jpg'
     hexo.route.set(path, input)
@@ -496,6 +533,23 @@ describe('brotli', () => {
     expect(result).toBeUndefined()
   })
 
+  test('option - invalid', async () => {
+    const level = 'foo'
+    hexo.config.minify.brotli.level = level
+
+    let expected
+    try {
+      await brotli(input, { params: { [zlib.constants.BROTLI_PARAM_QUALITY]: level } })
+    } catch (err) {
+      expected = err.message
+    }
+    try {
+      await b()
+    } catch (err) {
+      expect(err.message).toContain(expected)
+    }
+  })
+
   test('include - exclude non-text file by default', async () => {
     const path = 'foo.jpg'
     hexo.route.set(path, input)