/
main.go
141 lines (130 loc) · 3.19 KB
/
main.go
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package todo
import (
"encoding/json"
"net/http"
"time"
"google.golang.org/appengine"
"google.golang.org/appengine/datastore"
"google.golang.org/appengine/log"
"google.golang.org/appengine/user"
)
func init() {
http.HandleFunc("/", handle)
http.HandleFunc("/todo.json", jsonServe)
}
func handle(res http.ResponseWriter, req *http.Request) {
switch req.URL.Path {
case "/":
http.ServeFile(res, req, "index.html")
case "/style.css":
http.ServeFile(res, req, "style.css")
case "/script.js":
http.ServeFile(res, req, "script.js")
default:
http.NotFound(res, req)
}
}
type dataItem struct {
Value string
KeyVal string
}
type list struct {
Value string
Owner string
Time time.Time
}
func jsonServe(res http.ResponseWriter, req *http.Request) {
switch req.Method {
case "POST":
if len(req.FormValue("keyVal")) > 0 {
deleteData(res, req)
} else {
saveJSON(res, req)
}
case "GET":
getJSON(res, req)
default:
ctx := appengine.NewContext(req)
http.Error(res, "Bad HTTP method", http.StatusBadRequest)
log.Warningf(ctx, "Attempted HTTP method %s from %s", req.Method, req.RemoteAddr)
}
}
func deleteData(res http.ResponseWriter, req *http.Request) {
ctx := appengine.NewContext(req)
u := user.Current(ctx)
keyVal := req.FormValue("keyVal")
key, err := datastore.DecodeKey(keyVal)
if err != nil {
http.Error(res, "Invalid data", http.StatusBadRequest)
log.Warningf(ctx, err.Error())
return
}
var l list
err = datastore.Get(ctx, key, &l)
if err != nil {
http.Error(res, "Invalid data", http.StatusBadRequest)
log.Warningf(ctx, err.Error())
return
}
if l.Owner != u.Email {
http.Error(res, "Not authorized to delete this entry", http.StatusUnauthorized)
log.Warningf(ctx, err.Error())
return
}
err = datastore.Delete(ctx, key)
if err != nil {
http.Error(res, "Server Error", http.StatusInternalServerError)
log.Errorf(ctx, err.Error())
return
}
}
func getQuery(email string) *datastore.Query {
return datastore.NewQuery("List").
Filter("Owner =", email).
Order("Time")
}
func saveJSON(res http.ResponseWriter, req *http.Request) {
ctx := appengine.NewContext(req)
u := user.Current(ctx)
decoder := json.NewDecoder(req.Body)
key := datastore.NewIncompleteKey(ctx, "List", nil)
var l list
err := decoder.Decode(&l)
if err != nil {
http.Error(res, "Invalid data", http.StatusBadRequest)
log.Warningf(ctx, err.Error())
return
}
l.Owner = u.Email
l.Time = time.Now()
_, err = datastore.Put(ctx, key, &l)
if err != nil {
http.Error(res, "Server Error", http.StatusInternalServerError)
log.Errorf(ctx, err.Error())
return
}
}
func getJSON(res http.ResponseWriter, req *http.Request) {
ctx := appengine.NewContext(req)
u := user.Current(ctx)
query := getQuery(u.Email)
l := []list{}
keys, err := query.GetAll(ctx, &l)
if err != nil {
http.Error(res, "Server Error", http.StatusInternalServerError)
log.Errorf(ctx, err.Error())
return
}
items := make([]dataItem, len(l))
for i := range l {
items[i].Value = l[i].Value
items[i].KeyVal = keys[i].Encode()
}
enc := json.NewEncoder(res)
err = enc.Encode(items)
if err != nil {
http.Error(res, "Server Error", http.StatusInternalServerError)
log.Errorf(ctx, err.Error())
return
}
}