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// Server entry point
// 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"
"embed"
"html/template"
"io"
"log"
"net/http"
"os"
"path"
"strconv"
"strings"
)
//go:embed static/*
var static embed.FS
//go:embed templates/*.html
var templates embed.FS
// Type Page represents a comic page.
type Page struct {
Index int
Name string
}
// Type Archive represents a comic book zip archive.
type Archive struct {
Title string
Prev string
Next string
Entries []Page
}
// Type Directory represents a library directory in file system.
type Directory struct {
Title string
Entries []string
}
// Function escape ensures that question marks in path
// are not recognized as URL parameters.
func escape(name string) template.URL {
return template.URL(strings.Replace(name, "?", "%3f", -1))
}
// Function find searches for the directory entry of given name.
func find(entries []os.DirEntry, name string) int {
for i, entry := range entries {
if entry.Name() == name {
return i
}
}
return -1
}
// Function main starts Phylactery serving comics from PHYLACTERY_LIBRARY
// and listening on PHYLACTERY_ADDRESS.
func main() {
http.Handle("/static/", http.FileServer(http.FS(static)))
t, err := template.New("").Funcs(template.FuncMap{
"escape": escape,
}).ParseFS(templates, "templates/*.html")
if err != nil {
log.Fatal(err)
}
lib := os.Getenv("PHYLACTERY_LIBRARY")
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
p := path.Join(lib, path.Clean(r.URL.Path))
stat, err := os.Stat(p)
if err != nil {
http.NotFound(w, r)
return
}
if stat.IsDir() {
// Redirect URL without a trailing slash
// pointing to a non-directory page
if !strings.HasSuffix(r.URL.Path, "/") {
http.Redirect(w, r, r.URL.Path+"/",
http.StatusMovedPermanently)
return
}
// Render directory page
entries, _ := os.ReadDir(p)
var names []string
for _, entry := range entries {
if entry.IsDir() {
names = append(names, entry.Name()+"/")
} else {
names = append(names, entry.Name())
}
}
dir := Directory{stat.Name(), names}
t.ExecuteTemplate(w, "directory.html", dir)
return
} else if strings.HasSuffix(r.URL.Path, "/") {
// Redirect URL with a trailing slash
// pointing to a non-directory page
http.Redirect(w, r, r.URL.Path[:len(r.URL.Path)-1],
http.StatusMovedPermanently)
return
}
// Check if file is a valid ZIP archive
cbz, err := zip.OpenReader(p)
if err != nil {
http.Error(w, "invalid cbz", http.StatusNotAcceptable)
return
}
defer cbz.Close()
// Respond with an image inside the CBZ
r.ParseForm()
if entry, isImage := r.Form["entry"]; isImage {
i, err := strconv.Atoi(entry[0])
if err != nil || i < 0 || i >= len(cbz.File) {
http.NotFound(w, r)
return
}
image, _ := cbz.File[i].Open()
defer image.Close()
io.Copy(w, image)
return
}
// Render archive page
entries, _ := os.ReadDir(path.Join(p, ".."))
index := find(entries, stat.Name())
var pages []Page
for i, f := range cbz.File {
image, _ := cbz.File[i].Open()
defer image.Close()
buf := make([]byte, 512)
n, _ := image.Read(buf)
mime := http.DetectContentType(buf[:n])
if strings.HasPrefix(mime, "image/") {
pages = append(pages, Page{i, f.Name})
}
}
prev := ""
if index > 0 {
prev = entries[index-1].Name()
}
next := ""
if index < len(entries)-1 {
next = entries[index+1].Name()
}
t.ExecuteTemplate(w, "archive.html", Archive{
stat.Name(), prev, next, pages,
})
})
addr := os.Getenv("PHYLACTERY_ADDRESS")
log.Println("Listening on", addr)
log.Fatal(http.ListenAndServe(addr, nil))
}
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