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// Copyright 2018 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package filecache
import (
"path"
"path/filepath"
"strings"
"time"
"github.com/gohugoio/hugo/helpers"
"github.com/bep/mapstructure"
"github.com/pkg/errors"
"github.com/spf13/afero"
)
const (
cachesConfigKey = "caches"
resourcesGenDir = ":resourceDir/_gen"
)
var defaultCacheConfig = cacheConfig{
MaxAge: -1, // Never expire
Dir: ":cacheDir/:project",
}
const (
cacheKeyGetJSON = "getjson"
cacheKeyGetCSV = "getcsv"
cacheKeyImages = "images"
cacheKeyAssets = "assets"
)
var defaultCacheConfigs = map[string]cacheConfig{
cacheKeyGetJSON: defaultCacheConfig,
cacheKeyGetCSV: defaultCacheConfig,
cacheKeyImages: cacheConfig{
MaxAge: -1,
Dir: resourcesGenDir,
},
cacheKeyAssets: cacheConfig{
MaxAge: -1,
Dir: resourcesGenDir,
},
}
type cachesConfig map[string]cacheConfig
type cacheConfig struct {
// Max age of cache entries in this cache. Any items older than this will
// be removed and not returned from the cache.
// a negative value means forever, 0 means cache is disabled.
MaxAge time.Duration
// The directory where files are stored.
Dir string
// Will resources/_gen will get its own composite filesystem that
// also checks any theme.
isResourceDir bool
}
// GetJSONCache gets the file cache for getJSON.
func (f Caches) GetJSONCache() *Cache {
return f[cacheKeyGetJSON]
}
// GetCSVCache gets the file cache for getCSV.
func (f Caches) GetCSVCache() *Cache {
return f[cacheKeyGetCSV]
}
// ImageCache gets the file cache for processed images.
func (f Caches) ImageCache() *Cache {
return f[cacheKeyImages]
}
// AssetsCache gets the file cache for assets (processed resources, SCSS etc.).
func (f Caches) AssetsCache() *Cache {
return f[cacheKeyAssets]
}
func decodeConfig(p *helpers.PathSpec) (cachesConfig, error) {
c := make(cachesConfig)
valid := make(map[string]bool)
// Add defaults
for k, v := range defaultCacheConfigs {
c[k] = v
valid[k] = true
}
cfg := p.Cfg
m := cfg.GetStringMap(cachesConfigKey)
_, isOsFs := p.Fs.Source.(*afero.OsFs)
for k, v := range m {
cc := defaultCacheConfig
dc := &mapstructure.DecoderConfig{
Result: &cc,
DecodeHook: mapstructure.StringToTimeDurationHookFunc(),
WeaklyTypedInput: true,
}
decoder, err := mapstructure.NewDecoder(dc)
if err != nil {
return c, err
}
if err := decoder.Decode(v); err != nil {
return nil, err
}
if cc.Dir == "" {
return c, errors.New("must provide cache Dir")
}
name := strings.ToLower(k)
if !valid[name] {
return nil, errors.Errorf("%q is not a valid cache name", name)
}
c[name] = cc
}
// This is a very old flag in Hugo, but we need to respect it.
disabled := cfg.GetBool("ignoreCache")
for k, v := range c {
dir := filepath.ToSlash(filepath.Clean(v.Dir))
hadSlash := strings.HasPrefix(dir, "/")
parts := strings.Split(dir, "/")
for i, part := range parts {
if strings.HasPrefix(part, ":") {
resolved, isResource, err := resolveDirPlaceholder(p, part)
if err != nil {
return c, err
}
if isResource {
v.isResourceDir = true
}
parts[i] = resolved
}
}
dir = path.Join(parts...)
if hadSlash {
dir = "/" + dir
}
v.Dir = filepath.Clean(filepath.FromSlash(dir))
if !v.isResourceDir {
if isOsFs && !filepath.IsAbs(v.Dir) {
return c, errors.Errorf("%q must resolve to an absolute directory", v.Dir)
}
// Avoid cache in root, e.g. / (Unix) or c:\ (Windows)
if len(strings.TrimPrefix(v.Dir, filepath.VolumeName(v.Dir))) == 1 {
return c, errors.Errorf("%q is a root folder and not allowed as cache dir", v.Dir)
}
}
if disabled {
v.MaxAge = 0
}
c[k] = v
}
return c, nil
}
// Resolves :resourceDir => /myproject/resources etc., :cacheDir => ...
func resolveDirPlaceholder(p *helpers.PathSpec, placeholder string) (cacheDir string, isResource bool, err error) {
switch strings.ToLower(placeholder) {
case ":resourcedir":
return "", true, nil
case ":cachedir":
d, err := helpers.GetCacheDir(p.Fs.Source, p.Cfg)
return d, false, err
case ":project":
return filepath.Base(p.WorkingDir), false, nil
}
return "", false, errors.Errorf("%q is not a valid placeholder (valid values are :cacheDir or :resourceDir)", placeholder)
}
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