fix: add support for custom protocol, close #1404

ecosystem/theme-default/src/client/components/AutoLink.vue

@@ -10,7 +10,7 @@ export default defineComponent({
 
 <script setup lang="ts">
 import { useSiteData } from '@vuepress/client'
-import { isLinkHttp, isLinkMailto, isLinkTel } from '@vuepress/shared'
+import { hasProtocol, isLinkHttp } from '@vuepress/shared'
 import { computed, toRefs } from 'vue'
 import type { PropType } from 'vue'
 import { useRoute } from 'vue-router'
@@ -36,7 +36,7 @@ const { item } = toRefs(props)
 const hasHttpProtocol = computed(() => isLinkHttp(item.value.link))
 // if the link has non-http protocol
 const hasNonHttpProtocol = computed(
-  () => isLinkMailto(item.value.link) || isLinkTel(item.value.link),
+  () => !hasHttpProtocol.value && hasProtocol(item.value.link),
 )
 // resolve the `target` attr
 const linkTarget = computed(() => {

packages/shared/src/utils/hasProtocol.ts

@@ -0,0 +1,5 @@
+/**
+ * Whether the link has a protocol
+ */
+export const hasProtocol = (link: string): boolean =>
+  /^[a-z][a-z0-9+.-]*:/.test(link)

packages/shared/src/utils/index.ts

@@ -5,11 +5,9 @@ export * from './dedupeHead.js'
 export * from './ensureLeadingSlash.js'
 export * from './ensureEndingSlash.js'
 export * from './formatDateString.js'
+export * from './hasProtocol.js'
 export * from './isLinkExternal.js'
-export * from './isLinkFtp.js'
 export * from './isLinkHttp.js'
-export * from './isLinkMailto.js'
-export * from './isLinkTel.js'
 export * from './isPlainObject.js'
 export * from './omit.js'
 export * from './removeEndingSlash.js'

packages/shared/src/utils/isLinkExternal.ts

@@ -1,4 +1,3 @@
-import { isLinkFtp } from './isLinkFtp.js'
 import { isLinkHttp } from './isLinkHttp.js'
 
 const markdownLinkRegexp = /.md((\?|#).*)?$/
@@ -7,8 +6,7 @@ const markdownLinkRegexp = /.md((\?|#).*)?$/
  * Determine a link is external or not
  */
 export const isLinkExternal = (link: string, base = '/'): boolean => {
-  // http link or ftp link
-  if (isLinkHttp(link) || isLinkFtp(link)) {
+  if (isLinkHttp(link)) {
     return true
   }
 

packages/shared/tests/hasProtocal.spec.ts

@@ -0,0 +1,24 @@
+import { describe, expect, it } from 'vitest'
+import { hasProtocol } from '../src/index.js'
+
+const testCases: [string, ReturnType<typeof hasProtocol>][] = [
+  ['ftp://foobar.com', true],
+  ['mailto:foobar', true],
+  ['tel:foobar', true],
+  ['https://foobar.com', true],
+  ['http://foobar.com', true],
+  ['foobar.com', false],
+  ['/foo/bar', false],
+  ['../foo/bar', false],
+  ['//foobar.com', false],
+]
+
+describe('shared > hasProtocol', () => {
+  describe('should determine link with protocol correctly', () => {
+    testCases.forEach(([source, expected]) => {
+      it(`link: ${source}`, () => {
+        expect(hasProtocol(source)).toBe(expected)
+      })
+    })
+  })
+})

packages/shared/tests/isLinkExternal.spec.ts

@@ -5,27 +5,27 @@ const testCases: [
   Parameters<typeof isLinkExternal>,
   ReturnType<typeof isLinkExternal>,
 ][] = [
-  // http & ftp links
+  // http links
   [['https://foobar.com'], true],
   [['https://foobar.com', '/base/'], true],
   [['http://foobar.com'], true],
   [['http://foobar.com', '/base/'], true],
   [['//foobar.com'], true],
   [['//foobar.com', '/base/'], true],
-  [['ftp://foobar.com'], true],
-  [['ftp://foobar.com', '/base/'], true],
   [['https://foobar.com/base/README.md'], true],
   [['https://foobar.com/base/README.md', '/base/'], true],
   [['http://foobar.com/base/README.md'], true],
   [['http://foobar.com/base/README.md', '/base/'], true],
   [['//foobar.com/base/README.md'], true],
   [['//foobar.com/base/README.md', '/base/'], true],
-  [['ftp://foobar.com/base/README.md'], true],
-  [['ftp://foobar.com/base/README.md', '/base/'], true],
 
   // links with other protocols
   [['mailto:foobar', '/base/'], false],
   [['tel:foobar', '/base/'], false],
+  [['ftp://foobar.com'], false],
+  [['ftp://foobar.com', '/base/'], false],
+  [['ftp://foobar.com/base/README.md'], false],
+  [['ftp://foobar.com/base/README.md', '/base/'], false],
 
   // absolute links
   [['/foo/bar'], false],