Use native upload when relaying from discord.

Resolves 42wim#1965

bridge/discord/handlers.go

@@ -1,7 +1,10 @@
 package bdiscord
 
 import (
+ "path"
+
  "github.com/42wim/matterbridge/bridge/config"
+ "github.com/42wim/matterbridge/bridge/helper"
  "github.com/bwmarrin/discordgo"
  "github.com/davecgh/go-spew/spew"
 )
@@ -98,15 +101,14 @@ func (b *Bdiscord) messageCreate(s *discordgo.Session, m *discordgo.MessageCreat
  return
  }
 
- // add the url of the attachments to content
- if len(m.Attachments) > 0 {
- for _, attach := range m.Attachments {
- m.Content = m.Content + "\n" + attach.URL
- }
+ rmsg := config.Message{
+ Account: b.Account,
+ Avatar: "https://cdn.discordapp.com/avatars/" + m.Author.ID + "/" + m.Author.Avatar + ".jpg",
+ UserID: m.Author.ID,
+ ID: m.ID,
+ Extra: make(map[string][]interface{}),
  }
 
- rmsg := config.Message{Account: b.Account, Avatar: "https://cdn.discordapp.com/avatars/" + m.Author.ID + "/" + m.Author.Avatar + ".jpg", UserID: m.Author.ID, ID: m.ID}
-
  b.Log.Debugf("== Receiving event %#v", m.Message)
 
  if m.Content != "" {
@@ -138,8 +140,14 @@ func (b *Bdiscord) messageCreate(s *discordgo.Session, m *discordgo.MessageCreat
  }
  }
 
- // no empty messages
- if rmsg.Text == "" {
+ if len(m.Attachments) > 0 {
+ b.handleDownloadFile(&rmsg, m)
+ }
+
+ hasAttachment := len(rmsg.Extra["file"]) > 0
+
+ // no empty messages unless has attachment
+ if rmsg.Text == "" && !hasAttachment {
  return
  }
 
@@ -279,3 +287,14 @@ func handleEmbed(embed *discordgo.MessageEmbed) string {
 
  return result
 }
+
+func (b *Bdiscord) handleDownloadFile(rmsg *config.Message, m *discordgo.MessageCreate) {
+ for _, attach := range m.Attachments {
+ data, err := helper.DownloadFile(attach.URL)
+ if err != nil {
+ b.Log.Errorf("download %s failed %#v", attach.URL, err)
+ }
+
+ helper.HandleDownloadData(b.Log, rmsg, path.Base(attach.URL), rmsg.Text, attach.URL, data, b.General)
+ }
+}