fix: do not encode slashes in catch-all routes

This applies to all custom regex routes which match a slash or
contain one in their literal part

fixes vuejs#1638

packages/router/__tests__/router.spec.ts

@@ -931,6 +931,54 @@ describe('Router', () => {
     })
   })
 
+  it('escapes slashes in standard params', async () => {
+    const router = createRouter({
+      history: createMemoryHistory(),
+      routes: [{ path: '/home/:path', component: components.Home }],
+    })
+    await router.push('/home/pathparam')
+    await router.replace({ params: { path: 'test/this/is/escaped' } })
+    expect(router.currentRoute.value).toMatchObject({
+      fullPath: '/home/test%2Fthis%2Fis%2Fescaped',
+    })
+  })
+
+  it('keeps slashes in star params', async () => {
+    const router = createRouter({
+      history: createMemoryHistory(),
+      routes: [{ path: '/home/:path(.*)', component: components.Home }],
+    })
+    await router.push('/home/pathparam')
+    await router.replace({ params: { path: 'test/this/is/not/escaped' } })
+    expect(router.currentRoute.value).toMatchObject({
+      fullPath: '/home/test/this/is/not/escaped',
+    })
+    await router.replace({ hash: '#test' })
+    expect(router.currentRoute.value).toMatchObject({
+      fullPath: '/home/test/this/is/not/escaped#test',
+    })
+  })
+
+  it('keeps slashes in params containing slashes', async () => {
+    const router = createRouter({
+      history: createMemoryHistory(),
+      routes: [
+        {
+          path: '/home/:slug(.*)*/:path(test/deep/about\\.html(?!.*\\/\\).*)',
+          component: components.Foo,
+        },
+      ],
+    })
+    await router.push('/home/slug/test/deep/about.html')
+    await router.replace({
+      params: { slug: 'another/slug' },
+    })
+    await router.replace({ hash: '#hash' })
+    expect(router.currentRoute.value).toMatchObject({
+      fullPath: '/home/another/slug/test/deep/about.html#hash',
+    })
+  })
+
   describe('Dynamic Routing', () => {
     it('resolves new added routes', async () => {
       const { router } = await newRouter({ routes: [] })

packages/router/src/encoding.ts

@@ -119,6 +119,20 @@ export function encodePath(text: string | number): string {
   return commonEncode(text).replace(HASH_RE, '%23').replace(IM_RE, '%3F')
 }
 
+/**
+ * Encode characters that need to be encoded on the path section of the URL as a
+ * path param. This function does exactly what {@link encodePath} does, but if `text` is `null` or `undefined`, returns an empty
+ * string instead.
+ *
+ * @param text - string to encode
+ * @returns encoded string
+ */
+export function encodePathParam(
+  text: string | number | null | undefined
+): string {
+  return text == null ? '' : encodePath(text)
+}
+
 /**
  * Encode characters that need to be encoded on the path section of the URL as a
  * param. This function encodes everything {@link encodePath} does plus the
@@ -129,7 +143,7 @@ export function encodePath(text: string | number): string {
  * @returns encoded string
  */
 export function encodeParam(text: string | number | null | undefined): string {
-  return text == null ? '' : encodePath(text).replace(SLASH_RE, '%2F')
+  return encodePathParam(text).replace(SLASH_RE, '%2F')
 }
 
 /**

packages/router/src/matcher/index.ts

@@ -3,6 +3,7 @@ import {
   MatcherLocationRaw,
   MatcherLocation,
   isRouteName,
+  RouteParamsGeneric,
 } from '../types'
 import { createRouterError, ErrorTypes, MatcherError } from '../errors'
 import { createRouteRecordMatcher, RouteRecordMatcher } from './pathMatcher'
@@ -17,8 +18,9 @@ import type {
 import { comparePathParserScore } from './pathParserRanker'
 
 import { warn } from '../warning'
-import { assign, noop } from '../utils'
+import { applyToParam, assign, noop } from '../utils'
 import type { RouteRecordNameGeneric, _RouteRecordProps } from '../typed-routes'
+import { encodeParam, encodePathParam } from '../encoding'
 
 /**
  * Internal RouterMatcher
@@ -40,10 +42,12 @@ export interface RouterMatcher {
    *
    * @param location - MatcherLocationRaw to resolve to a url
    * @param currentLocation - MatcherLocation of the current location
+   * @param encodeParams - Whether to encode parameters or not. Defaults to `false`
    */
   resolve: (
     location: MatcherLocationRaw,
-    currentLocation: MatcherLocation
+    currentLocation: MatcherLocation,
+    encodeParams?: boolean
   ) => MatcherLocation
 }
 
@@ -230,15 +234,48 @@ export function createRouterMatcher(
       matcherMap.set(matcher.record.name, matcher)
   }
 
+  function encodeParams(
+    matcher: RouteRecordMatcher,
+    params: RouteParamsGeneric | undefined
+  ): MatcherLocation['params'] {
+    const newParams = {} as MatcherLocation['params']
+    if (params) {
+      for (let paramKey of Object.keys(params)) {
+        let matcherKey = matcher.keys.find(k => k.name == paramKey)
+
+        let keepSlash = matcherKey?.keepSlash ?? false
+        newParams[paramKey] = keepSlash
+          ? applyToParam(encodePathParam, params[paramKey])
+          : applyToParam(encodeParam, params[paramKey])
+      }
+    }
+    return newParams
+  }
+
   function resolve(
     location: Readonly<MatcherLocationRaw>,
-    currentLocation: Readonly<MatcherLocation>
+    currentLocation: Readonly<MatcherLocation>,
+    doEncodeParams: boolean = false
   ): MatcherLocation {
     let matcher: RouteRecordMatcher | undefined
     let params: PathParams = {}
     let path: MatcherLocation['path']
     let name: MatcherLocation['name']
 
+    // Encode params
+    let encodeLocationsParams = (matcher: RouteRecordMatcher) => {
+      if (doEncodeParams) {
+        if ('params' in location) {
+          location = assign(location, {
+            params: encodeParams(matcher, location.params),
+          })
+        }
+        currentLocation = assign(currentLocation, {
+          params: encodeParams(matcher, currentLocation.params),
+        })
+      }
+    }
+
     if ('name' in location && location.name) {
       matcher = matcherMap.get(location.name)
 
@@ -247,6 +284,8 @@ export function createRouterMatcher(
           location,
         })
 
+      encodeLocationsParams(matcher)
+
       // warn if the user is passing invalid params so they can debug it better when they get removed
       if (__DEV__) {
         const invalidParams: string[] = Object.keys(
@@ -301,6 +340,7 @@ export function createRouterMatcher(
       // matcher should have a value after the loop
 
       if (matcher) {
+        encodeLocationsParams(matcher)
         // we know the matcher works because we tested the regexp
         params = matcher.parse(path)!
         name = matcher.record.name
@@ -316,6 +356,7 @@ export function createRouterMatcher(
           location,
           currentLocation,
         })
+      encodeLocationsParams(matcher)
       name = matcher.record.name
       // since we are navigating to the same location, we don't need to pick the
       // params like when `name` is provided

packages/router/src/matcher/pathParserRanker.ts

@@ -10,6 +10,7 @@ interface PathParserParamKey {
   name: string
   repeatable: boolean
   optional: boolean
+  keepSlash: boolean
 }
 
 export interface PathParser {
@@ -156,11 +157,6 @@ export function tokensToParser(
         subSegmentScore += PathScore.Static
       } else if (token.type === TokenType.Param) {
         const { value, repeatable, optional, regexp } = token
-        keys.push({
-          name: value,
-          repeatable,
-          optional,
-        })
         const re = regexp ? regexp : BASE_PARAM_PATTERN
         // the user provided a custom regexp /:id(\\d+)
         if (re !== BASE_PARAM_PATTERN) {
@@ -176,6 +172,19 @@ export function tokensToParser(
           }
         }
 
+        // Keep slash if it matches regex
+        // Or if a slash is litterally contained outside of lookaheads, lookbehinds and negative ranges
+        let keepSlash =
+          new RegExp(`(${re})`).test('/') ||
+          /\//.test(re.replace(/\(\?<?[=!].*\)|\[\^.*\]/, ''))
+
+        keys.push({
+          name: value,
+          repeatable,
+          optional,
+          keepSlash,
+        })
+
         // when we repeat we must take care of the repeating leading slash
         let subPattern = repeatable ? `((?:${re})(?:/(?:${re}))*)` : `(${re})`
 

packages/router/src/router.ts

@@ -5,6 +5,7 @@ import {
   isRouteName,
   RouteLocationOptions,
   MatcherLocationRaw,
+  RouteParamsGeneric,
 } from './types'
 import type {
   RouteLocation,
@@ -40,7 +41,7 @@ import {
 } from './errors'
 import { applyToParams, isBrowser, assign, noop, isArray } from './utils'
 import { useCallbacks } from './utils/callbacks'
-import { encodeParam, decode, encodeHash } from './encoding'
+import { decode, encodeHash } from './encoding'
 import {
   normalizeQuery,
   parseQuery as originalParseQuery,
@@ -410,7 +411,6 @@ export function createRouter(options: RouterOptions): Router {
     null,
     paramValue => '' + paramValue
   )
-  const encodeParams = applyToParams.bind(null, encodeParam)
   const decodeParams: (params: RouteParams | undefined) => RouteParams =
     // @ts-expect-error: intentionally avoid the type check
     applyToParams.bind(null, decode)
@@ -529,16 +529,14 @@ export function createRouter(options: RouterOptions): Router {
           delete targetParams[key]
         }
       }
-      // pass encoded values to the matcher, so it can produce encoded path and fullPath
+
+      // matcher handles param encoding by itself, just pass cleaned params
       matcherLocation = assign({}, rawLocation, {
-        params: encodeParams(targetParams),
+        params: targetParams as RouteParamsGeneric,
       })
-      // current location params are decoded, we need to encode them in case the
-      // matcher merges the params
-      currentLocation.params = encodeParams(currentLocation.params)
     }
 
-    const matchedRoute = matcher.resolve(matcherLocation, currentLocation)
+    const matchedRoute = matcher.resolve(matcherLocation, currentLocation, true)
     const hash = rawLocation.hash || ''
 
     if (__DEV__ && hash && !hash.startsWith('#')) {

packages/router/src/utils/index.ts

@@ -13,6 +13,15 @@ export function isESModule(obj: any): obj is { default: RouteComponent } {
 
 export const assign = Object.assign
 
+export function applyToParam(
+  fn: (v: string | number | null | undefined) => string,
+  param: RouteParamValueRaw | Exclude<RouteParamValueRaw, null | undefined>[]
+): string | string[] {
+  return isArray(param)
+    ? param.map(fn)
+    : fn(param as Exclude<RouteParamValueRaw, any[]>)
+}
+
 export function applyToParams(
   fn: (v: string | number | null | undefined) => string,
   params: RouteParamsRawGeneric | undefined
@@ -21,9 +30,7 @@ export function applyToParams(
 
   for (const key in params) {
     const value = params[key]
-    newParams[key] = isArray(value)
-      ? value.map(fn)
-      : fn(value as Exclude<RouteParamValueRaw, any[]>)
+    newParams[key] = applyToParam(fn, value)
   }
 
   return newParams