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google_calendar.go
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google_calendar.go
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package calendar
import (
"context"
"errors"
"fmt"
"log"
"os"
"github.com/gin-gonic/gin"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"google.golang.org/api/calendar/v3"
"google.golang.org/api/option"
"github.com/coretrix/hitrix/service/component/config"
)
func NewGoogleCalendar(configService config.IConfig) (ICalendar, error) {
credentialFile, ok := configService.String("calendar.credential_file")
if !ok {
return nil, errors.New("missing calendar.credential_file")
}
scopes, ok := configService.Strings("calendar.scopes")
if !ok {
return nil, errors.New("missing calendar.scopes")
}
if len(scopes) == 0 {
return nil, errors.New("google calendar, scopes list is empty")
}
credentials, err := os.ReadFile(credentialFile)
if err != nil {
return nil, errors.New("google calendar, unable to read client secret file")
}
oAuth2config, err := google.ConfigFromJSON(credentials, scopes...)
if err != nil {
log.Fatalf("Unable to parse client secret file to config: %v", err)
}
return &GoogleCalendar{
Oauth2Config: oAuth2config,
Ctx: context.Background(),
}, nil
}
type GoogleCalendar struct {
Oauth2Config *oauth2.Config
Ctx context.Context
}
func (gc *GoogleCalendar) GetAuthLink(state string) string {
// we're forcing approval since if we don't google won't return refresh token second time this user logs in
return gc.Oauth2Config.AuthCodeURL(state, oauth2.AccessTypeOffline, oauth2.ApprovalForce)
}
func (gc *GoogleCalendar) GetStateCodeFromGin(c *gin.Context) (string, string, error) {
state, hasState := c.GetQuery("state")
code, hasCode := c.GetQuery("code")
if hasState && hasCode && state != "" && code != "" {
return state, code, nil
}
return "", "", errors.New("google calendar API, failed to obtain code or/and state from context")
}
func (gc *GoogleCalendar) GetTokenFromCode(code string) (*oauth2.Token, error) {
tok, err := gc.Oauth2Config.Exchange(gc.Ctx, code)
if err != nil {
return nil, fmt.Errorf("google calendar API, unable to retrieve token from web: %v", err)
}
return tok, nil
}
// RefreshToken refreshes the token if it's expired otherwise it returns the same token
// useful for updating token inside your database when it's refreshed
func (gc *GoogleCalendar) RefreshToken(token *oauth2.Token) (bool, *oauth2.Token, error) {
tokenSource := gc.Oauth2Config.TokenSource(gc.Ctx, token)
newToken, err := tokenSource.Token()
if err != nil {
return false, nil, err
}
return newToken.AccessToken != token.AccessToken, newToken, nil
}
func (gc *GoogleCalendar) GetCalendars(token *oauth2.Token) ([]*calendar.CalendarListEntry, error) {
srv, err := calendar.NewService(gc.Ctx, option.WithHTTPClient(gc.Oauth2Config.Client(gc.Ctx, token)))
if err != nil {
return nil, fmt.Errorf("google calendar API, unable to retrieve Calendar client: %v", err)
}
calendars := make([]*calendar.CalendarListEntry, 0)
err = srv.CalendarList.List().Pages(gc.Ctx, func(list *calendar.CalendarList) error {
calendars = append(calendars, list.Items...)
return nil
})
if err != nil {
return nil, err
}
return calendars, nil
}
type GetCalendarEventsArgs struct {
ShowDeleted *bool
SingleEvents *bool
TimeZone string
TimeMin string
TimeMax string
UpdatedMin string
}
func (gc *GoogleCalendar) GetCalendarEvents(token *oauth2.Token, calendarID string, args *GetCalendarEventsArgs) ([]*calendar.Event, error) {
srv, err := calendar.NewService(gc.Ctx, option.WithHTTPClient(gc.Oauth2Config.Client(gc.Ctx, token)))
if err != nil {
return nil, fmt.Errorf("google calendar API, unable to retrieve Calendar client: %v", err)
}
eventsConfig := srv.Events.List(calendarID)
if args.ShowDeleted != nil {
eventsConfig.ShowDeleted(*args.ShowDeleted)
}
if args.SingleEvents != nil {
eventsConfig.SingleEvents(*args.SingleEvents)
}
if args.TimeMax != "" {
eventsConfig.TimeMax(args.TimeMax)
}
if args.TimeMin != "" {
eventsConfig.TimeMin(args.TimeMin)
}
if args.TimeZone != "" {
eventsConfig.TimeZone(args.TimeZone)
}
if args.UpdatedMin != "" {
eventsConfig.UpdatedMin(args.UpdatedMin)
}
eventsRes, err := eventsConfig.Do()
if err != nil {
return nil, fmt.Errorf("google calendar API, unable to retrieve Calendar events list: %v", err)
}
return eventsRes.Items, nil
}
func (gc *GoogleCalendar) UpsertEvent(token *oauth2.Token, calendarID string, event *calendar.Event) (*calendar.Event, error) {
srv, err := calendar.NewService(gc.Ctx, option.WithHTTPClient(gc.Oauth2Config.Client(gc.Ctx, token)))
if err != nil {
return nil, fmt.Errorf("google calendar API, unable to retrieve Calendar client: %v", err)
}
if event.Created == "" {
createdEvent, err := srv.Events.Insert(calendarID, event).Do()
return createdEvent, err
}
updatedEvent, err := srv.Events.Update(calendarID, event.Id, event).Do()
return updatedEvent, err
}