Normalize paths to Gradle User Home when calculating cache keys

Fixes #77

__tests__/cache-utils.test.ts

@@ -11,5 +11,11 @@ describe('cacheUtils-utils', () => {
             const hash = cacheUtils.hashStrings(['foo', 'bar', 'baz'])
             expect(hash).toBe('6df23dc03f9b54cc38a0fc1483df6e21')
         })
+        it('normalized filenames', async () => {
+            const fileNames = ['/foo/bar/baz.zip', '../boo.html']
+            const posixHash = cacheUtils.hashFileNames(fileNames)
+            const windowsHash = cacheUtils.hashFileNames(fileNames)
+            expect(posixHash).toBe(windowsHash)
+        })
     })
 })

src/cache-gradle-user-home.ts

@@ -5,7 +5,7 @@ import * as core from '@actions/core'
 import * as glob from '@actions/glob'
 import * as exec from '@actions/exec'
 
-import {AbstractCache, hashStrings} from './cache-utils'
+import {AbstractCache, hashFileNames} from './cache-utils'
 
 // Which paths under Gradle User Home should be cached
 const CACHE_PATH = ['caches', 'notifications']
@@ -149,10 +149,7 @@ export class GradleUserHomeCache extends AbstractCache {
         const previouslyRestoredKey = fs.existsSync(cacheMetaFile)
             ? fs.readFileSync(cacheMetaFile, 'utf-8').trim()
             : ''
-        const cacheKey = this.createCacheKey(
-            bundle,
-            hashStrings(commonArtifactFiles)
-        )
+        const cacheKey = this.createCacheKey(bundle, commonArtifactFiles)
 
         if (previouslyRestoredKey === cacheKey) {
             this.debug(
@@ -171,8 +168,13 @@ export class GradleUserHomeCache extends AbstractCache {
         }
     }
 
-    protected createCacheKey(bundle: string, key: string): string {
+    protected createCacheKey(bundle: string, files: string[]): string {
         const cacheKeyPrefix = process.env['CACHE_KEY_PREFIX'] || ''
+        const relativeFiles = files.map(x =>
+            path.relative(this.gradleUserHome, x)
+        )
+        const key = hashFileNames(relativeFiles)
+
         return `${cacheKeyPrefix}${bundle}-${key}`
     }
 

src/cache-utils.ts

@@ -2,6 +2,7 @@ import * as core from '@actions/core'
 import * as cache from '@actions/cache'
 import * as github from '@actions/github'
 import * as crypto from 'crypto'
+import * as path from 'path'
 
 export function isCacheDisabled(): boolean {
     return core.getBooleanInput('cache-disabled')
@@ -53,6 +54,12 @@ export function hashStrings(values: string[]): string {
     return hash.digest('hex')
 }
 
+export function hashFileNames(fileNames: string[]): string {
+    return hashStrings(
+        fileNames.map(x => x.replace(new RegExp(`\\${path.sep}`, 'g'), '/'))
+    )
+}
+
 class CacheKey {
     key: string
     restoreKeys: string[]