Truncate Gradle args when constructing cache key (#71)

Cache keys have a hard limit of 512 characters, so we need to ensure that we don't generate a key longer than this.

- Remove excess whitespace
- Truncate to 400 characters

Fixes #70

src/cache-configuration.ts

@@ -4,7 +4,7 @@ import * as fs from 'fs'
 import * as core from '@actions/core'
 import * as cache from '@actions/cache'
 
-import * as crypto from './crypto-utils'
+import * as cacheUtils from './cache-utils'
 
 import {
     inputCacheKeyGlobs,
@@ -35,10 +35,11 @@ export async function restoreCachedConfiguration(
     const cacheKeyPrefix = 'configuration|'
 
     const args = core.getInput('arguments')
-    const cacheKeyWithArgs = `${cacheKeyPrefix}${args}|`
+    const argsKey = cacheUtils.truncateArgs(args)
+    const cacheKeyWithArgs = `${cacheKeyPrefix}${argsKey}|`
 
     const cacheKeyGlobs = inputCacheKeyGlobs('configuration-cache-key')
-    const hash = await crypto.hashFiles(rootDir, cacheKeyGlobs)
+    const hash = await cacheUtils.hashFiles(rootDir, cacheKeyGlobs)
     const cacheKey = `${cacheKeyWithArgs}${hash}`
 
     core.saveState(CONFIGURATION_CACHE_KEY, cacheKey)

src/cache-dependencies.ts

@@ -5,7 +5,7 @@ import * as os from 'os'
 import * as core from '@actions/core'
 import * as cache from '@actions/cache'
 
-import * as crypto from './crypto-utils'
+import * as cacheUtils from './cache-utils'
 
 const DEPENDENCIES_CACHE_PATH = 'DEPENDENCIES_CACHE_PATH'
 const DEPENDENCIES_CACHE_KEY = 'DEPENDENCIES_CACHE_KEY'
@@ -24,10 +24,11 @@ export async function restoreCachedDependencies(
     const cacheKeyPrefix = 'dependencies|'
 
     const args = core.getInput('arguments')
-    const cacheKeyWithArgs = `${cacheKeyPrefix}${args}|`
+    const argsKey = cacheUtils.truncateArgs(args)
+    const cacheKeyWithArgs = `${cacheKeyPrefix}${argsKey}|`
 
     const cacheKeyGlobs = inputCacheKeyGlobs('dependencies-cache-key')
-    const hash = await crypto.hashFiles(rootDir, cacheKeyGlobs)
+    const hash = await cacheUtils.hashFiles(rootDir, cacheKeyGlobs)
     const cacheKey = `${cacheKeyWithArgs}${hash}`
 
     core.saveState(DEPENDENCIES_CACHE_KEY, cacheKey)

src/cache-utils.ts

@@ -11,3 +11,7 @@ export async function hashFiles(
         .join('\n')
     return glob.hashFiles(combinedPatterns, {followSymbolicLinks})
 }
+
+export function truncateArgs(args: string): string {
+    return args.trim().replace(/\s+/g, ' ').substr(0, 400)
+}