/
calendar.go
172 lines (150 loc) · 4.58 KB
/
calendar.go
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package main
import (
"encoding/gob"
"flag"
"fmt"
"hash/fnv"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"path/filepath"
"strings"
"time"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
calendar "google.golang.org/api/calendar/v3"
)
var (
clientId = flag.String("clientid", "", "OAuth Client ID. If non-empty, overrides --clientid_file")
clientIdFile = flag.String("clientid_file", "clientid.ini", "Name of a file containing just the project's OAuth Client ID from https://code.google.com/apis/console/")
clientSecret = flag.String("secret", "", "OAuth Client Secret. If non-empty, overrides --secret_file")
clientSecretFile = flag.String("secret_file", "clientsecret.ini", "Name of a file containing just the project's OAuth Client Secret from https://code.google.com/apis/console/")
clientConfig *oauth2.Config
clientToken *oauth2.Token
calendarId = flag.String("calendar", "", "fetch from this calendarId")
)
type CacherRoundTripper struct {
Transport *oauth2.Transport
}
func getEvents(count int64) []*calendar.Event {
sourceToken := oauth2.ReuseTokenSource(nil, &fileTokenSource{})
t, _ := sourceToken.Token()
client := clientConfig.Client(oauth2.NoContext, t)
svc, err := calendar.New(client)
if err != nil {
fmt.Println(err)
}
//c, err := svc.CalendarList.List().Do()
startTime := time.Now().Format(time.RFC3339)
c, err := svc.Events.List(*calendarId).SingleEvents(true).OrderBy("startTime").TimeMin(startTime).MaxResults(count).Do()
//c, err := svc.Events.List(*calendarId).Do()
if err != nil {
fmt.Println(err)
return nil
}
return c.Items
}
//TODO sort by time http://stackoverflow.com/questions/23121026/sorting-by-time-time-in-golang
func initOauth() {
var err error
clientConfig = &oauth2.Config{
ClientID: valueOrFileContents(*clientId, *clientIdFile),
ClientSecret: valueOrFileContents(*clientSecret, *clientSecretFile),
RedirectURL: "http://localhost:3000/oauthredirect",
Scopes: []string{
calendar.CalendarReadonlyScope,
},
Endpoint: google.Endpoint,
}
//clientConfig.TokenSource = &tokenStore{}
if err != nil {
log.Println("err")
}
}
func handleSetupOauth(w http.ResponseWriter, r *http.Request) {
if *clientId == "" || *clientSecret == "" {
fmt.Println("--clientid and --secret must be provided!")
return
}
url := clientConfig.AuthCodeURL("", oauth2.AccessTypeOffline)
http.Redirect(w, r, url, http.StatusFound)
}
func handleOauthRedirect(w http.ResponseWriter, r *http.Request) (int, string) {
code := r.FormValue("code")
if code == "" {
return 500, "No code!"
}
t, err := clientConfig.Exchange(oauth2.NoContext, code)
if err != nil {
log.Fatal(err)
}
cacheFile := tokenCacheFile(clientConfig)
saveToken(cacheFile, t)
http.Redirect(w, r, "/", http.StatusFound)
return 200, "<h1>Success</h1>Authorized."
}
func valueOrFileContents(value string, filename string) string {
if value != "" {
return value
}
slurp, err := ioutil.ReadFile(filename)
if err != nil {
log.Println("Error reading %q: %v", filename, err)
}
return strings.TrimSpace(string(slurp))
}
func osUserCacheDir() string {
return filepath.Join(os.Getenv("HOME"), ".cache")
}
func tokenCacheFile(config *oauth2.Config) string {
hash := fnv.New32a()
hash.Write([]byte(config.ClientID))
hash.Write([]byte(config.ClientSecret))
hash.Write([]byte(config.Scopes[0]))
fn := fmt.Sprintf("api-tok%v", hash.Sum32())
return filepath.Join(osUserCacheDir(), url.QueryEscape(fn))
}
func tokenFromFile(file string) (*oauth2.Token, error) {
f, err := os.Open(file)
if err != nil {
return nil, err
}
defer f.Close()
t := new(oauth2.Token)
err = gob.NewDecoder(f).Decode(t)
return t, err
}
func saveToken(file string, token *oauth2.Token) {
clientToken = token
log.Printf("Saving token to %q token: %+v ", file, token)
f, err := os.Create(file)
if err != nil {
log.Printf("Warning: failed to cache oauth token: %v", err)
return
}
defer f.Close()
gob.NewEncoder(f).Encode(token)
}
type fileTokenSource struct {
}
func (t *fileTokenSource) WriteToken(token *oauth2.Token) {
cacheFile := tokenCacheFile(clientConfig)
saveToken(cacheFile, token)
}
func (t *fileTokenSource) Token() (*oauth2.Token, error) {
////Fetch token from file if we need to
if clientToken == nil {
cacheFile := tokenCacheFile(clientConfig)
var err error
clientToken, err = tokenFromFile(cacheFile)
if err != nil {
fmt.Println("Cannot find file: %q", cacheFile)
return nil, fmt.Errorf("Cannot find file: %q", cacheFile)
}
log.Printf("Using cached token %+v from %q", clientToken, cacheFile)
return clientToken, nil
}
return clientToken, nil
}