Golang Object.GetString方法代碼示例

// CheckAPIKey performs a test API call with the API key
// provided in the configuration file to determine if the
// service should be enabled.
func (yt *YouTube) CheckAPIKey() error {
	var (
		response *http.Response
		v        *jason.Object
		err      error
	)

	if viper.GetString("api_keys.youtube") == "" {
		return errors.New("No YouTube API key has been provided")
	}
	url := "https://www.googleapis.com/youtube/v3/videos?part=snippet&id=KQY9zrjPBjo&key=%s"
	response, err = http.Get(fmt.Sprintf(url, viper.GetString("api_keys.youtube")))
	defer response.Body.Close()
	if err != nil {
		return err
	}

	if v, err = jason.NewObjectFromReader(response.Body); err != nil {
		return err
	}

	if v, err = v.GetObject("error"); err == nil {
		message, _ := v.GetString("message")
		code, _ := v.GetInt64("code")
		errArray, _ := v.GetObjectArray("errors")
		reason, _ := errArray[0].GetString("reason")

		return fmt.Errorf("%d: %s (reason: %s)", code, message, reason)
	}
	return nil
}

// Internal helper function to get a string from a jason.Object
func jasonGetString(o *jason.Object, key string) string {
	if o == nil || key == "" {
		return ""
	}
	v, _ := o.GetString(key)
	return v
}

// GetTracks uses the passed URL to find and return
// tracks associated with the URL. An error is returned
// if any error occurs during the API call.
func (sc *SoundCloud) GetTracks(url string, submitter *gumble.User) ([]interfaces.Track, error) {
	var (
		apiURL string
		err    error
		resp   *http.Response
		v      *jason.Object
		track  bot.Track
		tracks []interfaces.Track
	)

	urlSplit := strings.Split(url, "#t=")

	apiURL = "http://api.soundcloud.com/resolve?url=%s&client_id=%s"

	if sc.isPlaylist(url) {
		// Submitter has added a playlist!
		resp, err = http.Get(fmt.Sprintf(apiURL, urlSplit[0], viper.GetString("api_keys.soundcloud")))
		defer resp.Body.Close()
		if err != nil {
			return nil, err
		}

		v, err = jason.NewObjectFromReader(resp.Body)
		if err != nil {
			return nil, err
		}

		title, _ := v.GetString("title")
		permalink, _ := v.GetString("permalink_url")
		playlist := &bot.Playlist{
			ID:        permalink,
			Title:     title,
			Submitter: submitter.Name,
			Service:   sc.ReadableName,
		}

		var scTracks []*jason.Object
		scTracks, err = v.GetObjectArray("tracks")
		if err != nil {
			return nil, err
		}

		dummyOffset, _ := time.ParseDuration("0s")
		for _, t := range scTracks {
			track, err = sc.getTrack(t, dummyOffset, submitter)
			if err != nil {
				// Skip this track.
				continue
			}
			track.Playlist = playlist
			tracks = append(tracks, track)
		}

		if len(tracks) == 0 {
			return nil, errors.New("Invalid playlist. No tracks were added")
		}
		return tracks, nil
	}

	// Submitter has added a track!

	offset := 0
	// Calculate track offset if needed
	if len(urlSplit) == 2 {
		timeSplit := strings.Split(urlSplit[1], ":")
		multiplier := 1
		for i := len(timeSplit) - 1; i >= 0; i-- {
			time, _ := strconv.Atoi(timeSplit[i])
			offset += time * multiplier
			multiplier *= 60
		}
	}
	playbackOffset, _ := time.ParseDuration(fmt.Sprintf("%ds", offset))

	resp, err = http.Get(fmt.Sprintf(apiURL, urlSplit[0], viper.GetString("api_keys.soundcloud")))
	defer resp.Body.Close()
	if err != nil {
		return nil, err
	}

	v, err = jason.NewObjectFromReader(resp.Body)
	if err != nil {
		return nil, err
	}
	track, err = sc.getTrack(v, playbackOffset, submitter)
	if err != nil {
		return nil, err
	}

	tracks = append(tracks, track)
	return tracks, nil
}

func (sc *SoundCloud) getTrack(obj *jason.Object, offset time.Duration, submitter *gumble.User) (bot.Track, error) {
	title, _ := obj.GetString("title")
	idInt, _ := obj.GetInt64("id")
	id := strconv.FormatInt(idInt, 10)
	url, _ := obj.GetString("permalink_url")
	author, _ := obj.GetString("user", "username")
	authorURL, _ := obj.GetString("user", "permalink_url")
	durationMS, _ := obj.GetInt64("duration")
	duration, _ := time.ParseDuration(fmt.Sprintf("%dms", durationMS))
	thumbnail, err := obj.GetString("artwork_url")
	if err != nil {
		// Track has no artwork, using profile avatar instead.
		thumbnail, _ = obj.GetString("user", "avatar_url")
	}

	return bot.Track{
		ID:             id,
		URL:            url,
		Title:          title,
		Author:         author,
		AuthorURL:      authorURL,
		Submitter:      submitter.Name,
		Service:        sc.ReadableName,
		Filename:       id + ".track",
		ThumbnailURL:   thumbnail,
		Duration:       duration,
		PlaybackOffset: offset,
		Playlist:       nil,
	}, nil
}

// GetTracks uses the passed URL to find and return
// tracks associated with the URL. An error is returned
// if any error occurs during the API call.
func (mc *Mixcloud) GetTracks(url string, submitter *gumble.User) ([]interfaces.Track, error) {
	var (
		apiURL string
		err    error
		resp   *http.Response
		v      *jason.Object
		tracks []interfaces.Track
	)

	apiURL = strings.Replace(url, "www", "api", 1)

	// Track playback offset is not present in Mixcloud URLs,
	// so we can safely assume that users will not request
	// a playback offset in the URL.
	offset, _ := time.ParseDuration("0s")

	resp, err = http.Get(apiURL)
	defer resp.Body.Close()
	if err != nil {
		return nil, err
	}

	v, err = jason.NewObjectFromReader(resp.Body)
	if err != nil {
		return nil, err
	}

	id, _ := v.GetString("slug")
	trackURL, _ := v.GetString("url")
	title, _ := v.GetString("name")
	author, _ := v.GetString("user", "username")
	authorURL, _ := v.GetString("user", "url")
	durationSecs, _ := v.GetInt64("audio_length")
	duration, _ := time.ParseDuration(fmt.Sprintf("%ds", durationSecs))
	thumbnail, err := v.GetString("pictures", "large")
	if err != nil {
		// Track has no artwork, using profile avatar instead.
		thumbnail, _ = v.GetString("user", "pictures", "large")
	}

	track := bot.Track{
		ID:             id,
		URL:            trackURL,
		Title:          title,
		Author:         author,
		AuthorURL:      authorURL,
		Submitter:      submitter.Name,
		Service:        mc.ReadableName,
		ThumbnailURL:   thumbnail,
		Filename:       id + ".track",
		Duration:       duration,
		PlaybackOffset: offset,
		Playlist:       nil,
	}

	tracks = append(tracks, track)

	return tracks, nil
}

// GetTracks uses the passed URL to find and return
// tracks associated with the URL. An error is returned
// if any error occurs during the API call.
func (yt *YouTube) GetTracks(url string, submitter *gumble.User) ([]interfaces.Track, error) {
	var (
		playlistURL      string
		playlistItemsURL string
		id               string
		err              error
		resp             *http.Response
		v                *jason.Object
		track            bot.Track
		tracks           []interfaces.Track
	)

	dummyOffset, _ := time.ParseDuration("0s")
	urlSplit := strings.Split(url, "?t=")

	playlistURL = "https://www.googleapis.com/youtube/v3/playlists?part=snippet&id=%s&key=%s"
	playlistItemsURL = "https://www.googleapis.com/youtube/v3/playlistItems?part=snippet,contentDetails&playlistId=%s&maxResults=%d&key=%s&pageToken=%s"
	id, err = yt.getID(urlSplit[0])
	if err != nil {
		return nil, err
	}

	if yt.isPlaylist(url) {
		resp, err = http.Get(fmt.Sprintf(playlistURL, id, viper.GetString("api_keys.youtube")))
		defer resp.Body.Close()
		if err != nil {
			return nil, err
		}

		v, err = jason.NewObjectFromReader(resp.Body)
		if err != nil {
			return nil, err
		}

		items, _ := v.GetObjectArray("items")
		item := items[0]

		title, _ := item.GetString("snippet", "title")

		playlist := &bot.Playlist{
			ID:        id,
			Title:     title,
			Submitter: submitter.Name,
			Service:   yt.ReadableName,
		}

		maxItems := math.MaxInt32
		if viper.GetInt("queue.max_tracks_per_playlist") > 0 {
			maxItems = viper.GetInt("queue.max_tracks_per_playlist")
		}

		// YouTube playlist searches return a max of 50 results per page
		maxResults := 50
		if maxResults > maxItems {
			maxResults = maxItems
		}

		pageToken := ""
		for len(tracks) < maxItems {
			curResp, curErr := http.Get(fmt.Sprintf(playlistItemsURL, id, maxResults, viper.GetString("api_keys.youtube"), pageToken))
			defer curResp.Body.Close()
			if curErr != nil {
				// An error occurred, simply skip this track.
				continue
			}

			v, err = jason.NewObjectFromReader(curResp.Body)
			if err != nil {
				// An error occurred, simply skip this track.
				continue
			}

			curTracks, _ := v.GetObjectArray("items")
			for _, track := range curTracks {
				videoID, _ := track.GetString("snippet", "resourceId", "videoId")

				// Unfortunately we have to execute another API call for each video as the YouTube API does not
				// return video durations from the playlistItems endpoint...
				newTrack, _ := yt.getTrack(videoID, submitter, dummyOffset)
				newTrack.Playlist = playlist
				tracks = append(tracks, newTrack)

				if len(tracks) >= maxItems {
					break
				}
			}

			pageToken, _ = v.GetString("nextPageToken")
			if pageToken == "" {
				break
			}
		}

		if len(tracks) == 0 {
			return nil, errors.New("Invalid playlist. No tracks were added")
		}
		return tracks, nil
//.........這裏部分代碼省略.........