tpl: Use hash for cache key

Use a hash for the cache key, to fix 'file name too long' errors when retreiving from long urls

Fixes #3690

diff --git a/tpl/data/cache.go b/tpl/data/cache.go
index b4f91c0f80076b89e8537d929579b8bf5966c29b..6c4033160c378a24d735ddb97d4de04af356f939 100644 (file)
--- a/tpl/data/cache.go
+++ b/tpl/data/cache.go
@@ -14,8 +14,9 @@
 package data
 
 import (
+       "crypto/md5"
+       "encoding/hex"
        "errors"
-       "net/url"
        "sync"
 
        "github.com/gohugoio/hugo/config"
@@ -27,7 +28,8 @@ var cacheMu sync.RWMutex
 
 // getCacheFileID returns the cache ID for a string.
 func getCacheFileID(cfg config.Provider, id string) string {
-       return cfg.GetString("cacheDir") + url.QueryEscape(id)
+       hash := md5.Sum([]byte(id))
+       return cfg.GetString("cacheDir") + hex.EncodeToString(hash[:])
 }
 
 // getCache returns the content for an ID from the file cache or an error.