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package main
import (
"embed"
"encoding/json"
"html/template"
"log"
"net/http"
"os"
"strconv"
"github.com/gorilla/mux"
)
//go:embed *.js
//go:embed *.in
var content embed.FS
func handleEntryOptions(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "OPTIONS, POST, GET")
w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
w.WriteHeader(http.StatusNoContent)
}
func handleEntryPost(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "OPTIONS, POST, GET")
w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
var entry Entry
err := json.NewDecoder(r.Body).Decode(&entry)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
err = InsertEntry(&entry)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
log.Println("New entry for", entry.Location)
}
type EntriesPage struct {
Total uint `json:"total"`
Offset uint `json:"offset"`
Size uint `json:"size"`
Entries []Entry `json:"entries"`
}
func handleEntryGet(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "OPTIONS, POST, GET")
w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
from64, _ := strconv.ParseUint(r.FormValue("from"), 10, 32)
from := uint(from64)
count, err := CountEntries()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
entries, err := ListEntries(from, 1000)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if entries == nil {
entries = []Entry{}
}
page := EntriesPage{Total: count, Offset: from, Size: uint(len(entries)), Entries: entries}
err = json.NewEncoder(w).Encode(&page)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
func handleHome(pathname string) func(http.ResponseWriter, *http.Request) {
t := template.Must(template.ParseFS(content, pathname))
return func(w http.ResponseWriter, r *http.Request) {
count, err := CountEntries()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
t.Execute(w, count)
}
}
func handleRequests() {
router := mux.NewRouter()
router.HandleFunc("/entries", handleEntryOptions).Methods("OPTIONS")
router.HandleFunc("/entries", handleEntryPost).Methods("POST")
router.HandleFunc("/entries", handleEntryGet).Methods("GET")
router.HandleFunc("/", handleHome("index.html.in")).Methods("GET")
router.PathPrefix("/").Handler(http.FileServer(http.FS(content)))
log.Fatal(http.ListenAndServe(configure(), router))
}
func configure() string {
at := os.Getenv("STATSAT")
if at == "" {
log.Println("Defaulting to STATSAT=:8080")
at = ":8080"
}
return at
}
func main() {
log.Println("Starting up")
InitEntries()
defer CloseEntries()
handleRequests()
}
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