Use upstream slack-go/slack again (#1018)

vendor/github.com/slack-go/slack/bots.go

@@ -0,0 +1,58 @@
+package slack
+
+import (
+	"context"
+	"net/url"
+)
+
+// Bot contains information about a bot
+type Bot struct {
+	ID      string   `json:"id"`
+	Name    string   `json:"name"`
+	Deleted bool     `json:"deleted"`
+	UserID  string   `json:"user_id"`
+	AppID   string   `json:"app_id"`
+	Updated JSONTime `json:"updated"`
+	Icons   Icons    `json:"icons"`
+}
+
+type botResponseFull struct {
+	Bot `json:"bot,omitempty"` // GetBotInfo
+	SlackResponse
+}
+
+func (api *Client) botRequest(ctx context.Context, path string, values url.Values) (*botResponseFull, error) {
+	response := &botResponseFull{}
+	err := api.postMethod(ctx, path, values, response)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := response.Err(); err != nil {
+		return nil, err
+	}
+
+	return response, nil
+}
+
+// GetBotInfo will retrieve the complete bot information
+func (api *Client) GetBotInfo(bot string) (*Bot, error) {
+	return api.GetBotInfoContext(context.Background(), bot)
+}
+
+// GetBotInfoContext will retrieve the complete bot information using a custom context
+func (api *Client) GetBotInfoContext(ctx context.Context, bot string) (*Bot, error) {
+	values := url.Values{
+		"token": {api.token},
+	}
+
+	if bot != "" {
+		values.Add("bot", bot)
+	}
+
+	response, err := api.botRequest(ctx, "bots.info", values)
+	if err != nil {
+		return nil, err
+	}
+	return &response.Bot, nil
+}