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// 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 page
import (
"fmt"
"os"
"path"
"path/filepath"
"regexp"
"strconv"
"strings"
"time"
"errors"
"github.com/gohugoio/hugo/common/maps"
"github.com/gohugoio/hugo/helpers"
)
// PermalinkExpander holds permalin mappings per section.
type PermalinkExpander struct {
// knownPermalinkAttributes maps :tags in a permalink specification to a
// function which, given a page and the tag, returns the resulting string
// to be used to replace that tag.
knownPermalinkAttributes map[string]pageToPermaAttribute
expanders map[string]map[string]func(Page) (string, error)
urlize func(uri string) string
}
// Time for checking date formats. Every field is different than the
// Go reference time for date formatting. This ensures that formatting this date
// with a Go time format always has a different output than the format itself.
var referenceTime = time.Date(2019, time.November, 9, 23, 1, 42, 1, time.UTC)
// Return the callback for the given permalink attribute and a boolean indicating if the attribute is valid or not.
func (p PermalinkExpander) callback(attr string) (pageToPermaAttribute, bool) {
if callback, ok := p.knownPermalinkAttributes[attr]; ok {
return callback, true
}
if strings.HasPrefix(attr, "sections[") {
fn := p.toSliceFunc(strings.TrimPrefix(attr, "sections"))
return func(p Page, s string) (string, error) {
return path.Join(fn(p.CurrentSection().SectionsEntries())...), nil
}, true
}
// Make sure this comes after all the other checks.
if referenceTime.Format(attr) != attr {
return p.pageToPermalinkDate, true
}
return nil, false
}
// NewPermalinkExpander creates a new PermalinkExpander configured by the given
// urlize func.
func NewPermalinkExpander(urlize func(uri string) string, patterns map[string]map[string]string) (PermalinkExpander, error) {
p := PermalinkExpander{urlize: urlize}
p.knownPermalinkAttributes = map[string]pageToPermaAttribute{
"year": p.pageToPermalinkDate,
"month": p.pageToPermalinkDate,
"monthname": p.pageToPermalinkDate,
"day": p.pageToPermalinkDate,
"weekday": p.pageToPermalinkDate,
"weekdayname": p.pageToPermalinkDate,
"yearday": p.pageToPermalinkDate,
"section": p.pageToPermalinkSection,
"sections": p.pageToPermalinkSections,
"title": p.pageToPermalinkTitle,
"slug": p.pageToPermalinkSlugElseTitle,
"slugorfilename": p.pageToPermalinkSlugElseFilename,
"filename": p.pageToPermalinkFilename,
}
p.expanders = make(map[string]map[string]func(Page) (string, error))
for kind, patterns := range patterns {
e, err := p.parse(patterns)
if err != nil {
return p, err
}
p.expanders[kind] = e
}
return p, nil
}
// Expand expands the path in p according to the rules defined for the given key.
// If no rules are found for the given key, an empty string is returned.
func (l PermalinkExpander) Expand(key string, p Page) (string, error) {
expanders, found := l.expanders[p.Kind()]
if !found {
return "", nil
}
expand, found := expanders[key]
if !found {
return "", nil
}
return expand(p)
}
func (l PermalinkExpander) parse(patterns map[string]string) (map[string]func(Page) (string, error), error) {
expanders := make(map[string]func(Page) (string, error))
// Allow " " and / to represent the root section.
const sectionCutSet = " /" + string(os.PathSeparator)
for k, pattern := range patterns {
k = strings.Trim(k, sectionCutSet)
if !l.validate(pattern) {
return nil, &permalinkExpandError{pattern: pattern, err: errPermalinkIllFormed}
}
pattern := pattern
matches := attributeRegexp.FindAllStringSubmatch(pattern, -1)
callbacks := make([]pageToPermaAttribute, len(matches))
replacements := make([]string, len(matches))
for i, m := range matches {
replacement := m[0]
attr := replacement[1:]
replacements[i] = replacement
callback, ok := l.callback(attr)
if !ok {
return nil, &permalinkExpandError{pattern: pattern, err: errPermalinkAttributeUnknown}
}
callbacks[i] = callback
}
expanders[k] = func(p Page) (string, error) {
if matches == nil {
return pattern, nil
}
newField := pattern
for i, replacement := range replacements {
attr := replacement[1:]
callback := callbacks[i]
newAttr, err := callback(p, attr)
if err != nil {
return "", &permalinkExpandError{pattern: pattern, err: err}
}
newField = strings.Replace(
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