mirror of
https://github.com/rjNemo/rentease.git
synced 2026-06-06 02:36:49 +00:00
113 lines
3.1 KiB
Go
113 lines
3.1 KiB
Go
package calendar
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"log"
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"net/http"
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"os"
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"time"
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"golang.org/x/oauth2"
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"golang.org/x/oauth2/google"
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"google.golang.org/api/calendar/v3"
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"google.golang.org/api/option"
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)
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const tokFile = "token.json"
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type Service struct {
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*calendar.Service
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}
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func NewService(ctx context.Context, credJson string) *Service {
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b := []byte(credJson)
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config, err := google.ConfigFromJSON(b, calendar.CalendarReadonlyScope)
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if err != nil {
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log.Fatalf("Unable to parse client secret file to config: %v", err)
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}
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client := getClient(ctx, config)
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srv, err := calendar.NewService(ctx, option.WithHTTPClient(client))
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if err != nil {
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log.Fatalf("Unable to retrieve Calendar client: %v", err)
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}
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return &Service{srv}
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}
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// TODO: implement create event, list events in a period, delete event
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// TODO: Delete this. It is just for Proof of Concept
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func (s Service) ListNextEvents() (*calendar.Events, error) {
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t := time.Now().Format(time.RFC3339)
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events, err := s.Events.List("primary").ShowDeleted(false).
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SingleEvents(true).TimeMin(t).MaxResults(10).OrderBy("startTime").Do()
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if err != nil {
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return nil, fmt.Errorf("unable to retrieve next ten of the user's events: %w", err)
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}
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if len(events.Items) == 0 {
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return nil, errors.New("no upcoming events found")
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} else {
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// TODO: return a custom type
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return events, nil
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}
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}
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// Retrieve a token, saves the token, then returns the generated client.
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func getClient(ctx context.Context, config *oauth2.Config) *http.Client {
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// The file token.json stores the user's access and refresh tokens, and is
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// created automatically when the authorization flow completes for the first
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// time.
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tok, err := tokenFromFile(tokFile)
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if err != nil {
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tok = getTokenFromWeb(config)
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saveToken(tokFile, tok)
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}
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return config.Client(ctx, tok)
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}
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// Request a token from the web, then returns the retrieved token.
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func getTokenFromWeb(config *oauth2.Config) *oauth2.Token {
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authURL := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
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fmt.Printf("Click on the following link to open in your browser \n%v\n", authURL)
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// TODO: write a callback endpoint that will parse the auth code from the URL
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var authCode string
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fmt.Print("Type the authorization code: \n> ")
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if _, err := fmt.Scan(&authCode); err != nil {
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log.Fatalf("Unable to read authorization code: %v", err)
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}
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tok, err := config.Exchange(context.TODO(), authCode)
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if err != nil {
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log.Fatalf("Unable to retrieve token from web: %v", err)
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}
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return tok
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}
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// Retrieves a token from a local file.
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func tokenFromFile(file string) (*oauth2.Token, error) {
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f, err := os.Open(file)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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tok := &oauth2.Token{}
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err = json.NewDecoder(f).Decode(tok)
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return tok, err
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}
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// Saves a token to a file path.
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func saveToken(path string, token *oauth2.Token) {
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fmt.Printf("Saving credential file to: %s\n", path)
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f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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log.Fatalf("Unable to cache oauth token: %v", err)
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}
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defer f.Close()
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json.NewEncoder(f).Encode(token)
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}
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