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package main
import (
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"path"
"strconv"
"strings"
"github.com/julienschmidt/httprouter"
)
var files map[string]map[int][]string
var IMAGE_TYPES map[string]int
func serveImage(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
log.Printf("GET %s", r.URL.Path)
abort := func(code int, reason string) {
http.Error(w, reason, code)
log.Printf("GET failed: %d %s", code, reason)
}
file, ok := files[p.ByName("type")]
if !ok {
abort(400, "Invalid Type")
return
}
simageType := p.ByName("image_type")
id := p.ByName("id")
localPath := path.Join("./", p.ByName("type"), simageType, id)
if _, err := os.Stat(localPath); err == nil {
log.Println("-> Serving from local file")
f, err := os.Open(localPath)
defer f.Close()
if err != nil {
abort(500, "Could not open File")
return
}
w.WriteHeader(200)
io.Copy(w, f)
return
}
if idx := strings.Index(id, ".jpg"); idx != -1 {
id = id[:idx]
}
numId, err := strconv.ParseInt(id, 10, 0)
if err != nil {
abort(400, "Invalid ID")
return
}
imageType, ok := IMAGE_TYPES[simageType]
if !ok {
abort(400, "Invalid image type")
return
}
images, ok := file[int(numId)]
if !ok {
abort(404, "Invalid Target")
return
}
if imageType < 0 || int(imageType) >= len(images) {
abort(400, "Invalid image type")
return
}
log.Println("-> downloading from acd")
res, err := http.Get(images[int(imageType)])
if err != nil {
abort(500, err.Error())
return
}
data, err := ioutil.ReadAll(res.Body)
if err != nil {
abort(500, err.Error())
return
}
if err := ioutil.WriteFile(localPath, data, 0755); err != nil {
abort(500, err.Error())
return
}
w.Write(data)
}
func loadList(name string) error {
data, err := ioutil.ReadFile(fmt.Sprintf("%s.list", name))
if err != nil {
return err
}
files[name] = make(map[int][]string)
entries := strings.Split(string(data), "\n")
for _, entry := range entries {
if entry == "" {
continue
}
data := strings.Split(entry, " ")
id, err := strconv.ParseInt(data[0], 10, 0)
if err != nil {
return err
}
if e, ok := files[name][int(id)]; ok {
files[name][int(id)] = append(e, data[1])
} else {
files[name][int(id)] = []string{data[1]}
}
}
return nil
}
func main() {
IMAGE_TYPES = make(map[string]int)
IMAGE_TYPES["thumb"] = 0
IMAGE_TYPES["full"] = 1
files = make(map[string]map[int][]string)
if err := loadList("gril"); err != nil {
log.Fatal(err)
}
if err := loadList("series"); err != nil {
log.Fatal(err)
}
router := httprouter.New()
router.GET("/:type/:image_type/:id", serveImage)
log.Println("starting image-on-demand on localhost:8081")
log.Fatal(http.ListenAndServe("localhost:8081", router))
}
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