ref: 166a394a2fef6f2990e264cc8dfb722af2cc6a67
dir: /resources/resource.go/
// Copyright 2019 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 resources
import (
"fmt"
"io"
"io/ioutil"
"mime"
"os"
"path"
"path/filepath"
"strings"
"sync"
"github.com/gohugoio/hugo/media"
"github.com/gohugoio/hugo/output"
"github.com/gohugoio/hugo/tpl"
"github.com/pkg/errors"
"github.com/gohugoio/hugo/cache/filecache"
"github.com/gohugoio/hugo/common/collections"
"github.com/gohugoio/hugo/common/hugio"
"github.com/gohugoio/hugo/common/loggers"
"github.com/gohugoio/hugo/resources/page"
"github.com/gohugoio/hugo/resources/resource"
"github.com/spf13/afero"
"github.com/gohugoio/hugo/helpers"
"github.com/gohugoio/hugo/source"
)
var (
_ resource.ContentResource = (*genericResource)(nil)
_ resource.ReadSeekCloserResource = (*genericResource)(nil)
_ resource.Resource = (*genericResource)(nil)
_ resource.Source = (*genericResource)(nil)
_ resource.Cloner = (*genericResource)(nil)
_ resource.ResourcesLanguageMerger = (*resource.Resources)(nil)
_ permalinker = (*genericResource)(nil)
_ collections.Slicer = (*genericResource)(nil)
_ resource.Identifier = (*genericResource)(nil)
)
var noData = make(map[string]interface{})
type permalinker interface {
relPermalinkFor(target string) string
permalinkFor(target string) string
relTargetPathsFor(target string) []string
relTargetPaths() []string
TargetPath() string
}
type Spec struct {
*helpers.PathSpec
MediaTypes media.Types
OutputFormats output.Formats
Logger *loggers.Logger
TextTemplates tpl.TemplateParseFinder
Permalinks page.PermalinkExpander
// Holds default filter settings etc.
imaging *Imaging
imageCache *imageCache
ResourceCache *ResourceCache
FileCaches filecache.Caches
}
func NewSpec(
s *helpers.PathSpec,
fileCaches filecache.Caches,
logger *loggers.Logger,
outputFormats output.Formats,
mimeTypes media.Types) (*Spec, error) {
imaging, err := decodeImaging(s.Cfg.GetStringMap("imaging"))
if err != nil {
return nil, err
}
if logger == nil {
logger = loggers.NewErrorLogger()
}
permalinks, err := page.NewPermalinkExpander(s)
if err != nil {
return nil, err
}
rs := &Spec{PathSpec: s,
Logger: logger,
imaging: &imaging,
MediaTypes: mimeTypes,
OutputFormats: outputFormats,
Permalinks: permalinks,
FileCaches: fileCaches,
imageCache: newImageCache(
fileCaches.ImageCache(),
s,
)}
rs.ResourceCache = newResourceCache(rs)
return rs, nil
}
type ResourceSourceDescriptor struct {
// TargetPaths is a callback to fetch paths's relative to its owner.
TargetPaths func() page.TargetPaths
// Need one of these to load the resource content.
SourceFile source.File
OpenReadSeekCloser resource.OpenReadSeekCloser
FileInfo os.FileInfo
// If OpenReadSeekerCloser is not set, we use this to open the file.
SourceFilename string
Fs afero.Fs
// The relative target filename without any language code.
RelTargetFilename string
// Any base paths prepended to the target path. This will also typically be the
// language code, but setting it here means that it should not have any effect on
// the permalink.
// This may be several values. In multihost mode we may publish the same resources to
// multiple targets.
TargetBasePaths []string
// Delay publishing until either Permalink or RelPermalink is called. Maybe never.
LazyPublish bool
}
func (r ResourceSourceDescriptor) Filename() string {
if r.SourceFile != nil {
return r.SourceFile.Filename()
}
return r.SourceFilename
}
func (r *Spec) New(fd ResourceSourceDescriptor) (resource.Resource, error) {
return r.newResourceFor(fd)
}
func (r *Spec) newResourceFor(fd ResourceSourceDescriptor) (resource.Resource, error) {
if fd.OpenReadSeekCloser == nil {
if fd.SourceFile != nil && fd.SourceFilename != "" {
return nil, errors.New("both SourceFile and AbsSourceFilename provided")
} else if fd.SourceFile == nil && fd.SourceFilename == "" {
return nil, errors.New("either SourceFile or AbsSourceFilename must be provided")
}
}
if fd.RelTargetFilename == "" {
fd.RelTargetFilename = fd.Filename()
}
if len(fd.TargetBasePaths) == 0 {
// If not set, we publish the same resource to all hosts.
fd.TargetBasePaths = r.MultihostTargetBasePaths
}
return r.newResource(fd.Fs, fd)
}
func (r *Spec) newResource(sourceFs afero.Fs, fd ResourceSourceDescriptor) (resource.Resource, error) {
fi := fd.FileInfo
var sourceFilename string
if fd.OpenReadSeekCloser != nil {
} else if fd.SourceFilename != "" {
var err error
fi, err = sourceFs.Stat(fd.SourceFilename)
if err != nil {
if os.IsNotExist(err) {
return nil, nil
}
return nil, err
}
sourceFilename = fd.SourceFilename
} else {
sourceFilename = fd.SourceFile.Filename()
}
if fd.RelTargetFilename == "" {
fd.RelTargetFilename = sourceFilename
}
ext := strings.ToLower(filepath.Ext(fd.RelTargetFilename))
mimeType, found := r.MediaTypes.GetFirstBySuffix(strings.TrimPrefix(ext, "."))
// TODO(bep) we need to handle these ambigous types better, but in this context
// we most likely want the application/xml type.
if mimeType.Suffix() == "xml" && mimeType.SubType == "rss" {
mimeType, found = r.MediaTypes.GetByType("application/xml")
}
if !found {
// A fallback. Note that mime.TypeByExtension is slow by Hugo standards,
// so we should configure media types to avoid this lookup for most
// situations.
mimeStr := mime.TypeByExtension(ext)
if mimeStr != "" {
mimeType, _ = media.FromStringAndExt(mimeStr, ext)
}
}
gr := r.newGenericResourceWithBase(
sourceFs,
fd.LazyPublish,
fd.OpenReadSeekCloser,
fd.TargetBasePaths,
fd.TargetPaths,
fi,
sourceFilename,
fd.RelTargetFilename,
mimeType)
if mimeType.MainType == "image" {
imgFormat, ok := imageFormats[ext]
if !ok {
// This allows SVG etc. to be used as resources. They will not have the methods of the Image, but
// that would not (currently) have worked.
return gr, nil
}
if err := gr.initHash(); err != nil {
return nil, err
}
return &Image{
format: imgFormat,
imaging: r.imaging,
genericResource: gr}, nil
}
return gr, nil
}
// TODO(bep) unify
func (r *Spec) IsInImageCache(key string) bool {
// This is used for cache pruning. We currently only have images, but we could
// imagine expanding on this.
return r.imageCache.isInCache(key)
}
func (r *Spec) DeleteCacheByPrefix(prefix string) {
r.imageCache.deleteByPrefix(prefix)
}
func (r *Spec) ClearCaches() {
r.imageCache.clear()
r.ResourceCache.clear()
}
func (r *Spec) CacheStats() string {
r.imageCache.mu.RLock()
defer r.imageCache.mu.RUnlock()
s := fmt.Sprintf("Cache entries: %d", len(r.imageCache.store))
count := 0
for k := range r.imageCache.store {
if count > 5 {
break
}
s += "\n" + k
count++
}
return s
}
type dirFile struct {
// This is the directory component with Unix-style slashes.
dir string
// This is the file component.
file string
}
func (d dirFile) path() string {
return path.Join(d.dir, d.file)
}
type resourcePathDescriptor struct {
// The relative target directory and filename.
relTargetDirFile dirFile
// Callback used to construct a target path relative to its owner.
targetPathBuilder func() page.TargetPaths
// This will normally be the same as above, but this will only apply to publishing
// of resources. It may be mulltiple values when in multihost mode.
baseTargetPathDirs []string
// baseOffset is set when the output format's path has a offset, e.g. for AMP.
baseOffset string
}
type resourceContent struct {
content string
contentInit sync.Once
}
type resourceHash struct {
hash string
hashInit sync.Once
}
type publishOnce struct {
publisherInit sync.Once
publisherErr error
logger *loggers.Logger
}
func (l *publishOnce) publish(s resource.Source) error {
l.publisherInit.Do(func() {
l.publisherErr = s.Publish()
if l.publisherErr != nil {
l.logger.ERROR.Printf("failed to publish Resource: %s", l.publisherErr)
}
})
return l.publisherErr
}
// genericResource represents a generic linkable resource.
type genericResource struct {
commonResource
resourcePathDescriptor
title string
name string
params map[string]interface{}
// Absolute filename to the source, including any content folder path.
// Note that this is absolute in relation to the filesystem it is stored in.
// It can be a base path filesystem, and then this filename will not match
// the path to the file on the real filesystem.
sourceFilename string
// Will be set if this resource is backed by something other than a file.
openReadSeekerCloser resource.OpenReadSeekCloser
// A hash of the source content. Is only calculated in caching situations.
*resourceHash
// This may be set to tell us to look in another filesystem for this resource.
// We, by default, use the sourceFs filesystem in the spec below.
sourceFs afero.Fs
spec *Spec
resourceType string
mediaType media.Type
osFileInfo os.FileInfo
// We create copies of this struct, so this needs to be a pointer.
*resourceContent
// May be set to signal lazy/delayed publishing.
*publishOnce
}
type commonResource struct {
}
func (l *genericResource) Data() interface{} {
return noData
}
func (l *genericResource) Content() (interface{}, error) {
if err := l.initContent(); err != nil {
return nil, err
}
return l.content, nil
}
func (l *genericResource) ReadSeekCloser() (hugio.ReadSeekCloser, error) {
if l.openReadSeekerCloser != nil {
return l.openReadSeekerCloser()
}
f, err := l.getSourceFs().Open(l.sourceFilename)
if err != nil {
return nil, err
}
return f, nil
}
func (l *genericResource) MediaType() media.Type {
return l.mediaType
}
// Implement the Cloner interface.
func (l genericResource) WithNewBase(base string) resource.Resource {
l.baseOffset = base
l.resourceContent = &resourceContent{}
return &l
}
// Slice is not meant to be used externally. It's a bridge function
// for the template functions. See collections.Slice.
func (commonResource) Slice(in interface{}) (interface{}, error) {
switch items := in.(type) {
case resource.Resources:
return items, nil
case []interface{}:
groups := make(resource.Resources, len(items))
for i, v := range items {
g, ok := v.(resource.Resource)
if !ok {
return nil, fmt.Errorf("type %T is not a Resource", v)
}
groups[i] = g
}
return groups, nil
default:
return nil, fmt.Errorf("invalid slice type %T", items)
}
}
func (l *genericResource) initHash() error {
var err error
l.hashInit.Do(func() {
var hash string
var f hugio.ReadSeekCloser
f, err = l.ReadSeekCloser()
if err != nil {
err = errors.Wrap(err, "failed to open source file")
return
}
defer f.Close()
hash, err = helpers.MD5FromFileFast(f)
if err != nil {
return
}
l.hash = hash
})
return err
}
func (l *genericResource) initContent() error {
var err error
l.contentInit.Do(func() {
var r hugio.ReadSeekCloser
r, err = l.ReadSeekCloser()
if err != nil {
return
}
defer r.Close()
var b []byte
b, err = ioutil.ReadAll(r)
if err != nil {
return
}
l.content = string(b)
})
return err
}
func (l *genericResource) getSourceFs() afero.Fs {
return l.sourceFs
}
func (l *genericResource) publishIfNeeded() {
if l.publishOnce != nil {
l.publishOnce.publish(l)
}
}
func (l *genericResource) Permalink() string {
l.publishIfNeeded()
return l.spec.PermalinkForBaseURL(l.relPermalinkForRel(l.relTargetDirFile.path(), true), l.spec.BaseURL.HostURL())
}
func (l *genericResource) RelPermalink() string {
l.publishIfNeeded()
return l.relPermalinkFor(l.relTargetDirFile.path())
}
func (l *genericResource) Key() string {
return l.relTargetDirFile.path()
}
func (l *genericResource) relPermalinkFor(target string) string {
return l.relPermalinkForRel(target, false)
}
func (l *genericResource) permalinkFor(target string) string {
return l.spec.PermalinkForBaseURL(l.relPermalinkForRel(target, true), l.spec.BaseURL.HostURL())
}
func (l *genericResource) relTargetPathsFor(target string) []string {
return l.relTargetPathsForRel(target)
}
func (l *genericResource) relTargetPaths() []string {
return l.relTargetPathsForRel(l.TargetPath())
}
func (l *genericResource) Name() string {
return l.name
}
func (l *genericResource) Title() string {
return l.title
}
func (l *genericResource) Params() map[string]interface{} {
return l.params
}
func (l *genericResource) setTitle(title string) {
l.title = title
}
func (l *genericResource) setName(name string) {
l.name = name
}
func (l *genericResource) updateParams(params map[string]interface{}) {
if l.params == nil {
l.params = params
return
}
// Sets the params not already set
for k, v := range params {
if _, found := l.params[k]; !found {
l.params[k] = v
}
}
}
func (l *genericResource) relPermalinkForRel(rel string, isAbs bool) string {
return l.spec.PathSpec.URLizeFilename(l.relTargetPathForRel(rel, false, isAbs, true))
}
func (l *genericResource) relTargetPathsForRel(rel string) []string {
if len(l.baseTargetPathDirs) == 0 {
return []string{l.relTargetPathForRelAndBasePath(rel, "", false, false)}
}
var targetPaths = make([]string, len(l.baseTargetPathDirs))
for i, dir := range l.baseTargetPathDirs {
targetPaths[i] = l.relTargetPathForRelAndBasePath(rel, dir, false, false)
}
return targetPaths
}
func (l *genericResource) relTargetPathForRel(rel string, addBaseTargetPath, isAbs, isURL bool) string {
if addBaseTargetPath && len(l.baseTargetPathDirs) > 1 {
panic("multiple baseTargetPathDirs")
}
var basePath string
if addBaseTargetPath && len(l.baseTargetPathDirs) > 0 {
basePath = l.baseTargetPathDirs[0]
}
return l.relTargetPathForRelAndBasePath(rel, basePath, isAbs, isURL)
}
func (l *genericResource) createBasePath(rel string, isURL bool) string {
if l.targetPathBuilder == nil {
return rel
}
tp := l.targetPathBuilder()
if isURL {
return path.Join(tp.SubResourceBaseLink, rel)
}
// TODO(bep) path
return path.Join(filepath.ToSlash(tp.SubResourceBaseTarget), rel)
}
func (l *genericResource) relTargetPathForRelAndBasePath(rel, basePath string, isAbs, isURL bool) string {
rel = l.createBasePath(rel, isURL)
if basePath != "" {
rel = path.Join(basePath, rel)
}
if l.baseOffset != "" {
rel = path.Join(l.baseOffset, rel)
}
if isURL {
bp := l.spec.PathSpec.GetBasePath(!isAbs)
if bp != "" {
rel = path.Join(bp, rel)
}
}
if len(rel) == 0 || rel[0] != '/' {
rel = "/" + rel
}
return rel
}
func (l *genericResource) ResourceType() string {
return l.resourceType
}
func (l *genericResource) String() string {
return fmt.Sprintf("Resource(%s: %s)", l.resourceType, l.name)
}
func (l *genericResource) Publish() error {
fr, err := l.ReadSeekCloser()
if err != nil {
return err
}
defer fr.Close()
fw, err := helpers.OpenFilesForWriting(l.spec.BaseFs.PublishFs, l.targetFilenames()...)
if err != nil {
return err
}
defer fw.Close()
_, err = io.Copy(fw, fr)
return err
}
// Path is stored with Unix style slashes.
func (l *genericResource) TargetPath() string {
return l.relTargetDirFile.path()
}
func (l *genericResource) targetFilenames() []string {
paths := l.relTargetPaths()
for i, p := range paths {
paths[i] = filepath.Clean(p)
}
return paths
}
// TODO(bep) clean up below
func (r *Spec) newGenericResource(sourceFs afero.Fs,
targetPathBuilder func() page.TargetPaths,
osFileInfo os.FileInfo,
sourceFilename,
baseFilename string,
mediaType media.Type) *genericResource {
return r.newGenericResourceWithBase(
sourceFs,
false,
nil,
nil,
targetPathBuilder,
osFileInfo,
sourceFilename,
baseFilename,
mediaType,
)
}
func (r *Spec) newGenericResourceWithBase(
sourceFs afero.Fs,
lazyPublish bool,
openReadSeekerCloser resource.OpenReadSeekCloser,
targetPathBaseDirs []string,
targetPathBuilder func() page.TargetPaths,
osFileInfo os.FileInfo,
sourceFilename,
baseFilename string,
mediaType media.Type) *genericResource {
if osFileInfo != nil && osFileInfo.IsDir() {
panic(fmt.Sprintf("dirs not supported resource types: %v", osFileInfo))
}
// This value is used both to construct URLs and file paths, but start
// with a Unix-styled path.
baseFilename = helpers.ToSlashTrimLeading(baseFilename)
fpath, fname := path.Split(baseFilename)
var resourceType string
if mediaType.MainType == "image" {
resourceType = mediaType.MainType
} else {
resourceType = mediaType.SubType
}
pathDescriptor := resourcePathDescriptor{
baseTargetPathDirs: helpers.UniqueStringsReuse(targetPathBaseDirs),
targetPathBuilder: targetPathBuilder,
relTargetDirFile: dirFile{dir: fpath, file: fname},
}
var po *publishOnce
if lazyPublish {
po = &publishOnce{logger: r.Logger}
}
return &genericResource{
openReadSeekerCloser: openReadSeekerCloser,
publishOnce: po,
resourcePathDescriptor: pathDescriptor,
sourceFs: sourceFs,
osFileInfo: osFileInfo,
sourceFilename: sourceFilename,
mediaType: mediaType,
resourceType: resourceType,
spec: r,
params: make(map[string]interface{}),
name: baseFilename,
title: baseFilename,
resourceContent: &resourceContent{},
resourceHash: &resourceHash{},
}
}