2 files changed, 69 insertions, 4 deletions
diff --git a/vendor/github.com/bwmarrin/discordgo/restapi.go b/vendor/github.com/bwmarrin/discordgo/restapi.go
index 84a2a31e..ebeea876 100644
--- a/vendor/github.com/bwmarrin/discordgo/restapi.go
+++ b/vendor/github.com/bwmarrin/discordgo/restapi.go
@@ -675,7 +675,7 @@ func (s *Session) GuildLeave(guildID string) (err error) {
 	return
 }
 
-// GuildBans returns an array of User structures for all bans of a
+// GuildBans returns an array of GuildBan structures for all bans of a
 // given guild.
 // guildID   : The ID of a Guild.
 func (s *Session) GuildBans(guildID string) (st []*GuildBan, err error) {
@@ -2067,15 +2067,80 @@ func (s *Session) WebhookDeleteWithToken(webhookID, token string) (st *Webhook,
 // WebhookExecute executes a webhook.
 // webhookID: The ID of a webhook.
 // token    : The auth token for the webhook
-func (s *Session) WebhookExecute(webhookID, token string, wait bool, data *WebhookParams) (err error) {
+// wait     : Wait for server to confirm the message arrival
+//
+// If `wait` is `false`, the returned *Message is always empty, because server
+// does not provide the response data.
+func (s *Session) WebhookExecute(webhookID, token string, wait bool, data *WebhookParams) (st *Message, err error) {
 	uri := EndpointWebhookToken(webhookID, token)
 
 	if wait {
 		uri += "?wait=true"
 	}
 
-	_, err = s.RequestWithBucketID("POST", uri, data, EndpointWebhookToken("", ""))
+	var response []byte
+	if data.File != nil {
+		body := &bytes.Buffer{}
+		bodywriter := multipart.NewWriter(body)
 
+		var payload []byte
+		payload, err = json.Marshal(data)
+		if err != nil {
+			return
+		}
+
+		var p io.Writer
+
+		h := make(textproto.MIMEHeader)
+		h.Set("Content-Disposition", `form-data; name="payload_json"`)
+		h.Set("Content-Type", "application/json")
+
+		p, err = bodywriter.CreatePart(h)
+		if err != nil {
+			return
+		}
+
+		if _, err = p.Write(payload); err != nil {
+			return
+		}
+
+		{
+			file := data.File
+			h := make(textproto.MIMEHeader)
+			h.Set("Content-Disposition", fmt.Sprintf(`form-data; name="file"; filename="%s"`, quoteEscaper.Replace(file.Name)))
+			contentType := file.ContentType
+			if contentType == "" {
+				contentType = "application/octet-stream"
+			}
+			h.Set("Content-Type", contentType)
+
+			p, err = bodywriter.CreatePart(h)
+			if err != nil {
+				return
+			}
+
+			if _, err = io.Copy(p, file.Reader); err != nil {
+				return
+			}
+		}
+
+		err = bodywriter.Close()
+		if err != nil {
+			return
+		}
+
+		response, err = s.request("POST", uri, bodywriter.FormDataContentType(), body.Bytes(), EndpointWebhookToken("", ""), 0)
+	} else {
+		response, err = s.RequestWithBucketID("POST", uri, data, EndpointWebhookToken("", ""))
+	}
+	if err != nil {
+		return
+	}
+	if !wait {
+		return
+	}
+
+	err = unmarshal(response, &st)
 	return
 }
 
diff --git a/vendor/github.com/bwmarrin/discordgo/structs.go b/vendor/github.com/bwmarrin/discordgo/structs.go
index 4465ec52..29468a71 100644
--- a/vendor/github.com/bwmarrin/discordgo/structs.go
+++ b/vendor/github.com/bwmarrin/discordgo/structs.go
@@ -832,7 +832,7 @@ type WebhookParams struct {
 	Username  string          `json:"username,omitempty"`
 	AvatarURL string          `json:"avatar_url,omitempty"`
 	TTS       bool            `json:"tts,omitempty"`
-	File      string          `json:"file,omitempty"`
+	File      *File           `json:"-"`
 	Embeds    []*MessageEmbed `json:"embeds,omitempty"`
 }