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// Atom feed synthesizer
// Copyright (C) 2022 Nguyễn Gia Phong
//
// This file is part of Phylactery.
//
// Phylactery is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Phylactery is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with Phylactery. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"archive/zip"
"encoding/xml"
"net/http"
"os"
"path"
"path/filepath"
"strconv"
"strings"
"time"
)
// Type Img represents an XHTML img tag.
type Img struct {
Src string `xml:"src,attr"`
Alt string `xml:"alt,attr"`
}
// Type Div represents an XHTML div tag.
type Div struct {
NS string `xml:"xmlns,attr"`
Img []Img `xml:"img"`
}
// Type AtomLink represents an atom:link element.
type AtomLink struct {
Rel string `xml:"rel,attr"`
Href string `xml:"href,attr"`
}
// Type AtomContent represents an atom:content element.
type AtomContent struct {
Type string `xml:"type,attr"`
Div Div `xml:"div"`
}
// Type AtomEntry represents an Atom Entry Document.
type AtomEntry struct {
Title string `xml:"title"`
ID string `xml:"id"`
Link []AtomLink `xml:"link"`
Updated time.Time `xml:"updated"`
Content AtomContent `xml:"content"`
}
// Type AtomFeed represents an Atom Feed Document.
type AtomFeed struct {
XMLName xml.Name `xml:"http://www.w3.org/2005/Atom feed"`
Title string `xml:"title"`
ID string `xml:"id"`
Link []AtomLink `xml:"link"`
Updated time.Time `xml:"updated"`
Author string `xml:"author>name"`
Entry []AtomEntry `xml:"entry"`
}
// Function synthesizeAtom generates an Atom feed for given directory.
func synthesizeAtom(r *http.Request, dir string, updated time.Time) AtomFeed {
baseURL := "http://" + r.Host
if r.TLS != nil {
baseURL = "https" + baseURL[4:]
}
var entries []AtomEntry
filepath.WalkDir(dir, func(p string, d os.DirEntry, err error) error {
if err != nil || d.IsDir() {
return nil
}
name := strings.TrimPrefix(p, dir)[1:]
u := escape(baseURL + path.Join(r.URL.Path, name))
var images []Img
cbz, err := zip.OpenReader(p)
if err != nil {
return nil
}
defer cbz.Close()
for i, f := range cbz.File {
if !isImageFile(f) {
continue
}
images = append(images,
Img{u + "?entry=" + strconv.Itoa(i), f.Name})
}
info, _ := d.Info()
entries = append(entries, AtomEntry{
Title: name,
ID: name,
Link: []AtomLink{{"alternate", u}},
Updated: info.ModTime(),
Content: AtomContent{
"xhtml",
Div{"http://www.w3.org/1999/xhtml", images},
},
})
return nil
})
id := escape(baseURL + r.URL.Path)
return AtomFeed{
Title: r.URL.Path[1 : len(r.URL.Path)-1],
ID: id,
Link: []AtomLink{
{"alternate", id},
{"self", id + "?feed=atom"},
},
Updated: updated,
Entry: entries,
}
}
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