Support code snippets from msteams

bridge/msteams/handler.go

@@ -1,10 +1,14 @@
 package bmsteams
 
 import (
+	"encoding/json"
 	"fmt"
+	"io/ioutil"
+	"strings"
 
 	"github.com/42wim/matterbridge/bridge/config"
 	"github.com/42wim/matterbridge/bridge/helper"
+
 	msgraph "github.com/yaegashi/msgraph.go/beta"
 )
 
@@ -50,10 +54,48 @@ func (b *Bmsteams) handleAttachments(rmsg *config.Message, msg msgraph.ChatMessa
 	for _, a := range msg.Attachments {
 		//remove the attachment tags from the text
 		rmsg.Text = attachRE.ReplaceAllString(rmsg.Text, "")
+
+		//handle a code snippet (code block)
+		if *a.ContentType == "application/vnd.microsoft.card.codesnippet" {
+			b.handleCodeSnippet(rmsg, a)
+			continue
+		}
+
 		//handle the download
 		err := b.handleDownloadFile(rmsg, *a.Name, *a.ContentURL)
 		if err != nil {
 			b.Log.Errorf("download of %s failed: %s", *a.Name, err)
 		}
 	}
 }
+
+type AttachContent struct {
+	Language       string `json:"language"`
+	CodeSnippetURL string `json:"codeSnippetUrl"`
+}
+
+func (b *Bmsteams) handleCodeSnippet(rmsg *config.Message, attach msgraph.ChatMessageAttachment) {
+	var content AttachContent
+	err := json.Unmarshal([]byte(*attach.Content), &content)
+	if err != nil {
+		b.Log.Errorf("unmarshal codesnippet failed: %s", err)
+		return
+	}
+	s := strings.Split(content.CodeSnippetURL, "/")
+	if len(s) != 13 {
+		b.Log.Errorf("codesnippetUrl has unexpected size: %s", content.CodeSnippetURL)
+		return
+	}
+	resp, err := b.gc.Teams().Request().Client().Get(content.CodeSnippetURL)
+	if err != nil {
+		b.Log.Errorf("retrieving snippet content failed:%s", err)
+		return
+	}
+	defer resp.Body.Close()
+	res, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		b.Log.Errorf("reading snippet data failed: %s", err)
+		return
+	}
+	rmsg.Text = rmsg.Text + "\n```" + content.Language + "\n" + string(res) + "\n```\n"
+}