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main.go
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main.go
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package main
import (
"context"
"encoding/json"
"fmt"
"log"
"net/http"
"os"
"time"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"google.golang.org/api/calendar/v3"
"google.golang.org/api/option"
)
// Retrieve a token, saves the token, then returns the generated client.
func getClient(config *oauth2.Config, ch <-chan string) *http.Client {
// The file token.json stores the user's access and refresh tokens, and is
// created automatically when the authorization flow completes for the first
// time.
tokFile := "token.json"
tok, err := tokenFromFile(tokFile)
if err != nil {
tok = getTokenFromWeb(config, ch)
saveToken(tokFile, tok)
}
return config.Client(context.Background(), tok)
}
// Request a token from the web, then returns the retrieved token.
func getTokenFromWeb(config *oauth2.Config, ch <-chan string) *oauth2.Token {
config.RedirectURL += ":8364"
authURL := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
fmt.Printf("Go to the following link in your browser\n%v\n", authURL)
authCode := <-ch
fmt.Println("Successfully retrieved auth code.")
tok, err := config.Exchange(context.Background(), authCode)
if err != nil {
log.Fatalf("Unable to retrieve token from web: %v", err)
}
return tok
}
// Retrieves a token from a local file.
func tokenFromFile(file string) (*oauth2.Token, error) {
f, err := os.Open(file)
if err != nil {
return nil, err
}
defer f.Close()
tok := &oauth2.Token{}
err = json.NewDecoder(f).Decode(tok)
return tok, err
}
// Saves a token to a file path.
func saveToken(path string, token *oauth2.Token) {
fmt.Printf("Saving credential file to: %s\n", path)
f, err := os.OpenFile(path, 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 main() {
ctx := context.Background()
b, err := os.ReadFile("credentials.json")
if err != nil {
log.Fatalf("Unable to read client secret file: %v", err)
}
codeCh := make(chan string)
go runServer(codeCh)
// If modifying these scopes, delete your previously saved token.json.
config, err := google.ConfigFromJSON(b, calendar.CalendarReadonlyScope)
if err != nil {
log.Fatalf("Unable to parse client secret file to config: %v", err)
}
client := getClient(config, codeCh)
srv, err := calendar.NewService(ctx, option.WithHTTPClient(client))
if err != nil {
log.Fatalf("Unable to retrieve Calendar client: %w", err)
}
t := time.Now().Format(time.RFC3339)
events, err := srv.Events.List("primary").ShowDeleted(false).
SingleEvents(true).TimeMin(t).MaxResults(10).OrderBy("startTime").Do()
if err != nil {
log.Fatalf("Unable to retrieve next ten of the user's events: %v", err)
}
fmt.Println("Upcoming events:")
if len(events.Items) == 0 {
fmt.Println("No upcoming events found.")
} else {
for _, item := range events.Items {
date := item.Start.DateTime
if date == "" {
date = item.Start.Date
}
fmt.Printf("%v (%v)\n", item.Summary, date)
}
}
}
func runServer(ch chan<- string) {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
ch <- r.URL.Query().Get("code")
w.Write([]byte("Successfully authenticated. You can close this tab now."))
})
log.Fatalln(http.ListenAndServe(":8364", nil))
}