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package main
import (
"crypto/sha1"
"embed"
"encoding/hex"
"encoding/json"
"html/template"
"io/ioutil"
"log"
"net/http"
"os"
"regexp"
"sort"
"github.com/gorilla/mux"
)
//go:embed *.json *.css *.js *.svg
var content embed.FS
//go:embed *.tmpl
var internal embed.FS
var (
templates *template.Template
root string
validToken *regexp.Regexp
)
func main() {
initRoot()
validToken = regexp.MustCompile(`[a-fA-F0-9]+`)
port := os.Getenv("DERELICTPORT")
if port == "" {
port = "8080"
}
templates = template.Must(template.ParseFS(internal, "*.tmpl"))
router := mux.NewRouter()
router.HandleFunc("/", handleRecent).Methods("GET")
router.HandleFunc("/view/{id:[_0-9a-f]+}", handleView).Methods("GET")
router.HandleFunc("/battles", handleBattlesPost).Methods("POST")
router.HandleFunc("/battles/{id:[_0-9a-f]+}", handleBattlesId).Methods("GET")
router.PathPrefix("/").Handler(http.FileServer(http.FS(content)))
log.Fatal(http.ListenAndServe(":"+port, router))
}
func initRoot() {
root = os.Getenv("DERELICTROOT")
if root == "" {
root = ".derelict"
}
os.Mkdir(root, 0755)
os.Mkdir(root+"/battles", 0755)
os.Mkdir(root+"/tokens", 0700)
}
func handleBattlesPost(w http.ResponseWriter, r *http.Request) {
token := r.Header.Get("Derelict-Token")
if !validToken.MatchString(token) {
http.Error(w, "Invalid token", http.StatusBadRequest)
return
}
_, err := os.Stat(root + "/tokens/" + token)
if _, ok := err.(*os.PathError); ok {
http.Error(w, "Unauthorized", http.StatusUnauthorized)
return
}
if err != nil {
http.Error(w, "Unexpected error 1", http.StatusInternalServerError)
return
}
var wrecks []Wreck
data, err := ioutil.ReadAll(r.Body)
if err != nil {
http.Error(w, "Unexpected error 2", http.StatusInternalServerError)
return
}
err = json.Unmarshal(data, &wrecks)
if err != nil {
http.Error(w, "Error in body", http.StatusBadRequest)
return
}
hash := sha1.Sum(data)
name := hex.EncodeToString(hash[:])
ioutil.WriteFile(root+"/battles/"+name, data, 0644)
w.WriteHeader(http.StatusOK)
w.Write([]byte(name))
}
func handleBattlesId(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
w.Header().Add("Content-Type", "application/json")
http.ServeFile(w, r, root+"/battles/"+id)
}
func handleRecent(w http.ResponseWriter, r *http.Request) {
files, err := ioutil.ReadDir(root + "/battles")
if err != nil {
panic(err)
}
sort.Slice(files, func(lhs, rhs int) bool {
return files[lhs].ModTime().After(files[rhs].ModTime())
})
count := 10
if count > len(files) {
count = len(files)
}
templates.ExecuteTemplate(w, "recent", files[:count])
}
func handleView(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
templates.ExecuteTemplate(w, "view", id)
}
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