// 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 resource
import (
"fmt"
"io"
"io/ioutil"
"mime"
"os"
"path"
"path/filepath"
"strings"
"sync"
"github.com/gohugoio/hugo/output"
"github.com/gohugoio/hugo/tpl"
"github.com/pkg/errors"
"github.com/gohugoio/hugo/common/collections"
"github.com/gohugoio/hugo/common/hugio"
"github.com/gohugoio/hugo/common/loggers"
"github.com/spf13/afero"
"github.com/gobwas/glob"
"github.com/gohugoio/hugo/helpers"
"github.com/gohugoio/hugo/media"
"github.com/gohugoio/hugo/source"
)
var (
_ ContentResource = (*genericResource)(nil)
_ ReadSeekCloserResource = (*genericResource)(nil)
_ Resource = (*genericResource)(nil)
_ Source = (*genericResource)(nil)
_ Cloner = (*genericResource)(nil)
_ ResourcesLanguageMerger = (*Resources)(nil)
_ permalinker = (*genericResource)(nil)
_ collections.Slicer = (*genericResource)(nil)
)
var noData = make(map[string]interface{})
// Source is an internal template and not meant for use in the templates. It
// may change without notice.
type Source interface {
Publish() error
}
type permalinker interface {
relPermalinkFor(target string) string
permalinkFor(target string) string
relTargetPathsFor(target string) []string
relTargetPaths() []string
targetPath() string
}
// Cloner is an internal template and not meant for use in the templates. It
// may change without notice.
type Cloner interface {
WithNewBase(base string) Resource
}
// Resource represents a linkable resource, i.e. a content page, image etc.
type Resource interface {
// Permalink represents the absolute link to this resource.
Permalink() string
// RelPermalink represents the host relative link to this resource.
RelPermalink() string
// ResourceType is the resource type. For most file types, this is the main
// part of the MIME type, e.g. "image", "application", "text" etc.
// For content pages, this value is "page".
ResourceType() string
// MediaType is this resource's MIME type.
MediaType() media.Type
// Name is the logical name of this resource. This can be set in the front matter
// metadata for this resource. If not set, Hugo will assign a value.
// This will in most cases be the base filename.
// So, for the image "/some/path/sunset.jpg" this will be "sunset.jpg".
// The value returned by this method will be used in the GetByPrefix and ByPrefix methods
// on Resources.
Name() string
// Title returns the title if set in front matter. For content pages, this will be the expected value.
Title() string
// Resource specific data set by Hugo.
// One example would be.Data.Digest for fingerprinted resources.
Data() interface{}
// Params set in front matter for this resource.
Params() map[string]interface{}
}
// ResourcesLanguageMerger describes an interface for merging resources from a
// different language.
type ResourcesLanguageMerger interface {
MergeByLanguage(other Resources) Resources
// Needed for integration with the tpl package.
MergeByLanguageInterface(other interface{}) (interface{}, error)
}
type translatedResource interface {
TranslationKey() string
}
// ContentResource represents a Resource that provides a way to get to its content.
// Most Resource types in Hugo implements this interface, including Page.
// This should be used with care, as it will read the file content into memory, but it
// should be cached as effectively as possible by the implementation.
type ContentResource interface {
Resource
// Content returns this resource's content. It will be equivalent to reading the content
// that RelPermalink points to in the published folder.
// The return type will be contextual, and should be what you would expect:
// * Page: template.HTML
// * JSON: String
// * Etc.
Content() (interface{}, error)
}
// OpenReadSeekCloser allows setting some other way (than reading from a filesystem)
// to open or create a ReadSeekCloser.