forked from wtfutil/wtf
/
client.go
195 lines (167 loc) · 5.01 KB
/
client.go
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/*
* This butt-ugly code is direct from Google itself
* https://developers.google.com/calendar/quickstart/go
*/
package gcal
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"os/user"
"path/filepath"
"sort"
"time"
"github.com/senorprogrammer/wtf/wtf"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"google.golang.org/api/calendar/v3"
)
/* -------------------- Exported Functions -------------------- */
func Fetch() (*calendar.Events, error) {
ctx := context.Background()
secretPath, _ := wtf.ExpandHomeDir(wtf.Config.UString("wtf.mods.gcal.secretFile"))
b, err := ioutil.ReadFile(secretPath)
if err != nil {
return nil, err
}
config, err := google.ConfigFromJSON(b, calendar.CalendarReadonlyScope)
if err != nil {
return nil, err
}
client := getClient(ctx, config)
srv, err := calendar.New(client)
if err != nil {
return nil, err
}
calendarIds, err := getCalendarIdList(srv)
// Get calendar events
var events calendar.Events
startTime := fromMidnight().Format(time.RFC3339)
eventLimit := int64(wtf.Config.UInt("wtf.mods.gcal.eventCount", 10))
for _, calendarId := range calendarIds {
calendarEvents, err := srv.Events.List(calendarId).ShowDeleted(false).TimeMin(startTime).MaxResults(eventLimit).SingleEvents(true).OrderBy("startTime").Do()
if err != nil {
break
}
events.Items = append(events.Items, calendarEvents.Items...)
}
if err != nil {
return nil, err
}
// Sort events
timeDateChooser := func(event *calendar.Event) (time.Time, error) {
if len(event.Start.Date) > 0 {
return time.Parse("2006-01-02", event.Start.Date)
} else {
return time.Parse(time.RFC3339, event.Start.DateTime)
}
}
sort.Slice(events.Items, func(i, j int) bool {
dateA, _ := timeDateChooser(events.Items[i])
dateB, _ := timeDateChooser(events.Items[j])
return dateA.Before(dateB)
})
return &events, err
}
/* -------------------- Unexported Functions -------------------- */
func fromMidnight() time.Time {
now := time.Now()
return time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
}
// getClient uses a Context and Config to retrieve a Token
// then generate a Client. It returns the generated Client.
func getClient(ctx context.Context, config *oauth2.Config) *http.Client {
cacheFile, err := tokenCacheFile()
if err != nil {
log.Fatalf("Unable to get path to cached credential file. %v", err)
}
tok, err := tokenFromFile(cacheFile)
if err != nil {
tok = getTokenFromWeb(config)
saveToken(cacheFile, tok)
}
return config.Client(ctx, tok)
}
// getTokenFromWeb uses Config to request a Token.
// It returns the retrieved Token.
func getTokenFromWeb(config *oauth2.Config) *oauth2.Token {
authURL := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
fmt.Printf("Go to the following link in your browser then type the "+
"authorization code: \n%v\n", authURL)
var code string
if _, err := fmt.Scan(&code); err != nil {
log.Fatalf("Unable to read authorization code %v", err)
}
tok, err := config.Exchange(oauth2.NoContext, code)
if err != nil {
log.Fatalf("Unable to retrieve token from web %v", err)
}
return tok
}
// tokenCacheFile generates credential file path/filename.
// It returns the generated credential path/filename.
func tokenCacheFile() (string, error) {
usr, err := user.Current()
if err != nil {
return "", err
}
tokenCacheDir := filepath.Join(usr.HomeDir, ".credentials")
os.MkdirAll(tokenCacheDir, 0700)
return filepath.Join(tokenCacheDir,
url.QueryEscape("calendar-go-quickstart.json")), err
}
// tokenFromFile retrieves a Token from a given file path.
// It returns the retrieved Token and any read error encountered.
func tokenFromFile(file string) (*oauth2.Token, error) {
f, err := os.Open(file)
if err != nil {
return nil, err
}
t := &oauth2.Token{}
err = json.NewDecoder(f).Decode(t)
defer f.Close()
return t, err
}
// saveToken uses a file path to create a file and store the
// token in it.
func saveToken(file string, token *oauth2.Token) {
fmt.Printf("Saving credential file to: %s\n", file)
f, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
log.Fatalf("Unable to cache oauth token: %v", err)
}
defer f.Close()
json.NewEncoder(f).Encode(token)
}
func getCalendarIdList(srv *calendar.Service) ([]string, error) {
// Return single calendar if settings specify we should
if !wtf.Config.UBool("wtf.mods.gcal.multiCalendar", false) {
id, err := srv.CalendarList.Get("primary").Do()
if err != nil {
return nil, err
}
return []string{id.Id}, nil
}
// Get all user calendars with at the least writing access
var calendarIds []string
var pageToken string
for {
calendarList, err := srv.CalendarList.List().ShowHidden(false).MinAccessRole("writer").PageToken(pageToken).Do()
if err != nil {
return nil, err
}
for _, calendarListItem := range calendarList.Items {
calendarIds = append(calendarIds, calendarListItem.Id)
}
pageToken = calendarList.NextPageToken
if pageToken == "" {
break
}
}
return calendarIds, nil
}