mirror of
https://github.com/taigrr/wtf
synced 2025-01-18 04:03:14 -08:00
139 lines
3.5 KiB
Go
139 lines
3.5 KiB
Go
/*
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* This butt-ugly code is direct from Google itself
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* https://developers.google.com/calendar/quickstart/go
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*/
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package gcal
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import (
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"context"
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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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"github.com/senorprogrammer/wtf/wtf"
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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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/* -------------------- Exported Functions -------------------- */
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func Fetch() (*calendar.Events, error) {
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ctx := context.Background()
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secretPath, _ := wtf.ExpandHomeDir(Config.UString("wtf.mods.gcal.secretFile"))
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b, err := ioutil.ReadFile(secretPath)
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if err != nil {
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return nil, err
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}
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config, err := google.ConfigFromJSON(b, calendar.CalendarReadonlyScope)
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if err != nil {
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return nil, 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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return nil, err
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}
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startTime := fromMidnight().Format(time.RFC3339)
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eventLimit := int64(Config.UInt("wtf.mods.gcal.eventCount", 10))
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events, err := srv.Events.List("primary").ShowDeleted(false).SingleEvents(true).TimeMin(startTime).MaxResults(eventLimit).OrderBy("startTime").Do()
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if err != nil {
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return nil, err
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}
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return events, err
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}
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/* -------------------- Unexported Functions -------------------- */
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func fromMidnight() time.Time {
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now := time.Now()
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return time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
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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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