/
main.go
executable file
·113 lines (105 loc) · 2.6 KB
/
main.go
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package main
import (
"encoding/json"
"net/http"
"strconv"
"google.golang.org/appengine"
"google.golang.org/appengine/datastore"
"google.golang.org/appengine/log"
"google.golang.org/appengine/user"
)
type ToDo struct {
ID int64 `datastore:"-"`
Email string
Text string
}
func init() {
http.HandleFunc("/", handleIndex)
http.HandleFunc("/todo", handleTodos)
http.Handle("/assets/", http.StripPrefix("/assets", http.FileServer(http.Dir("assets/"))))
}
func handleIndex(res http.ResponseWriter, req *http.Request) {
if req.URL.Path != "/" {
http.NotFound(res, req)
return
}
http.ServeFile(res, req, "assets/templates/index.html")
}
func handleTodos(res http.ResponseWriter, req *http.Request) {
ctx := appengine.NewContext(req)
u := user.Current(ctx)
todos := make([]ToDo, 0)
switch req.Method {
case "GET":
q := datastore.NewQuery("ToDo").Filter("Email =", u.Email)
iterator := q.Run(ctx)
for {
var todo ToDo
key, err := iterator.Next(&todo)
if err == datastore.Done {
break
} else if err != nil {
log.Errorf(ctx, "error retrieving todos: %v", err)
http.Error(res, err.Error(), 500)
return
}
todo.ID = key.IntID()
todos = append(todos, todo)
}
err := json.NewEncoder(res).Encode(todos)
if err != nil {
log.Errorf(ctx, "error marshalling todos: %v", err)
return
}
case "POST":
// the user is posting a new item
var todo ToDo
err := json.NewDecoder(req.Body).Decode(&todo)
if err != nil {
log.Errorf(ctx, "error unmarshalling todos: %v", err)
http.Error(res, err.Error(), 500)
return
}
todo.Email = u.Email
// add to datastore
key := datastore.NewIncompleteKey(ctx, "ToDo", nil)
key, err = datastore.Put(ctx, key, &todo)
if err != nil {
log.Errorf(ctx, "error adding todo: %v", err)
http.Error(res, err.Error(), 500)
return
}
todo.ID = key.IntID()
// send back to user
err = json.NewEncoder(res).Encode(todo)
if err != nil {
log.Errorf(ctx, "error marshalling todo: %v", err)
return
}
case "DELETE":
id, _ := strconv.ParseInt(req.FormValue("id"), 10, 64)
if id == 0 {
http.Error(res, "not found", 404)
return
}
key := datastore.NewKey(ctx, "ToDo", "", id, nil)
var todo ToDo
err := datastore.Get(ctx, key, &todo)
if err != nil {
log.Errorf(ctx, "error getting todo: %v", err)
http.Error(res, err.Error(), 500)
return
}
if todo.Email != u.Email {
http.Error(res, "access denied", 401)
return
}
err = datastore.Delete(ctx, key)
if err != nil {
log.Errorf(ctx, "error deleting todo: %v", err)
return
}
default:
http.Error(res, "Method Not Allowed", 405)
}
}