Add MediaConvertWebPToPNG option (telegram). (#741)

* Add MediaConvertWebPToPNG option (telegram).

When enabled matterbridge will convert .webp files to .png files
before uploading them to the mediaserver of the other bridges.

Fixes #398

bridge/helper/helper.go

@@ -3,6 +3,7 @@ package helper
 import (
 	"bytes"
 	"fmt"
+	"image/png"
 	"io"
 	"net/http"
 	"regexp"
@@ -10,6 +11,8 @@ import (
 	"time"
 	"unicode/utf8"
 
+	"golang.org/x/image/webp"
+
 	"github.com/42wim/matterbridge/bridge/config"
 	"github.com/sirupsen/logrus"
 	"gitlab.com/golang-commonmark/markdown"
@@ -177,3 +180,19 @@ func ParseMarkdown(input string) string {
 	md := markdown.New(markdown.XHTMLOutput(true), markdown.Breaks(true))
 	return (md.RenderToString([]byte(input)))
 }
+
+// ConvertWebPToPNG convert input data (which should be WebP format to PNG format)
+func ConvertWebPToPNG(data *[]byte) error {
+	r := bytes.NewReader(*data)
+	m, err := webp.Decode(r)
+	if err != nil {
+		return err
+	}
+	var output []byte
+	w := bytes.NewBuffer(output)
+	if err := png.Encode(w, m); err != nil {
+		return err
+	}
+	*data = w.Bytes()
+	return nil
+}

bridge/helper/helper_test.go

@@ -1,6 +1,8 @@
 package helper
 
 import (
+	"io/ioutil"
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -103,3 +105,22 @@ func TestGetSubLines(t *testing.T) {
 		assert.Equalf(t, testcase.nonSplitOutput, nonSplitLines, "'%s' testcase should give expected lines without splitting.", testname)
 	}
 }
+
+func TestConvertWebPToPNG(t *testing.T) {
+	if os.Getenv("LOCAL_TEST") == "" {
+		t.Skip()
+	}
+	input, err := ioutil.ReadFile("test.webp")
+	if err != nil {
+		t.Fail()
+	}
+	d := &input
+	err = ConvertWebPToPNG(d)
+	if err != nil {
+		t.Fail()
+	}
+	err = ioutil.WriteFile("test.png", *d, 0644)
+	if err != nil {
+		t.Fail()
+	}
+}