138 lines
3.7 KiB
Go
138 lines
3.7 KiB
Go
package main
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"log"
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"net/http"
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"net/url"
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"os"
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"os/user"
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"path/filepath"
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"time"
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"golang.org/x/net/context"
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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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)
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// getClient uses a Context and Config to retrieve a Token
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// then generate a Client. It returns the generated Client.
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func getClient(ctx context.Context, config *oauth2.Config) *http.Client {
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cacheFile, err := tokenCacheFile()
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if err != nil {
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log.Fatalf("Unable to get path to cached credential file. %v", err)
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}
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tok, err := tokenFromFile(cacheFile)
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if err != nil {
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tok = getTokenFromWeb(config)
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saveToken(cacheFile, tok)
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}
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return config.Client(ctx, tok)
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}
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// getTokenFromWeb uses Config to request a Token.
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// It 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("Go to the following link in your browser then type the "+
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"authorization code: \n%v\n", authURL)
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var code string
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if _, err := fmt.Scan(&code); 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(oauth2.NoContext, code)
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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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// tokenCacheFile generates credential file path/filename.
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// It returns the generated credential path/filename.
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func tokenCacheFile() (string, error) {
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usr, err := user.Current()
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if err != nil {
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return "", err
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}
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tokenCacheDir := filepath.Join(usr.HomeDir, ".credentials")
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os.MkdirAll(tokenCacheDir, 0700)
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return filepath.Join(tokenCacheDir,
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url.QueryEscape("calendar-go-quickstart.json")), err
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}
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// tokenFromFile retrieves a Token from a given file path.
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// It returns the retrieved Token and any read error encountered.
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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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t := &oauth2.Token{}
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err = json.NewDecoder(f).Decode(t)
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defer f.Close()
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return t, err
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}
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// saveToken uses a file path to create a file and store the
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// token in it.
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func saveToken(file string, token *oauth2.Token) {
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fmt.Printf("Saving credential file to: %s\n", file)
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f, err := os.OpenFile(file, 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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func main() {
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ctx := context.Background()
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b, err := ioutil.ReadFile("client_secret.json")
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if err != nil {
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log.Fatalf("Unable to read client secret file: %v", err)
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}
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// If modifying these scopes, delete your previously saved credentials
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// at ~/.credentials/calendar-go-quickstart.json
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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.New(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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t := time.Now().Format(time.RFC3339)
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events, err := srv.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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log.Fatalf("Unable to retrieve next ten of the user's events. %v", err)
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}
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fmt.Println("Upcoming events:")
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if len(events.Items) > 0 {
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for _, i := range events.Items {
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var when string
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// If the DateTime is an empty string the Event is an all-day Event.
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// So only Date is available.
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if i.Start.DateTime != "" {
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when = i.Start.DateTime
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} else {
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when = i.Start.Date
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}
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fmt.Printf("%s (%s)\n", i.Summary, when)
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}
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} else {
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fmt.Printf("No upcoming events found.\n")
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}
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}
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