implement POST /emoji for apiV4 (#5868)

utils/emoji.go

@@ -0,0 +1,62 @@
+// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package utils
+
+import (
+	"bytes"
+	"image"
+	"image/color"
+	"image/gif"
+	"image/jpeg"
+	"image/png"
+	"testing"
+)
+
+func CreateTestGif(t *testing.T, width int, height int) []byte {
+	var buffer bytes.Buffer
+
+	if err := gif.Encode(&buffer, image.NewRGBA(image.Rect(0, 0, width, height)), nil); err != nil {
+		t.Fatalf("failed to create gif: %v", err.Error())
+	}
+
+	return buffer.Bytes()
+}
+
+func CreateTestAnimatedGif(t *testing.T, width int, height int, frames int) []byte {
+	var buffer bytes.Buffer
+
+	img := gif.GIF{
+		Image: make([]*image.Paletted, frames, frames),
+		Delay: make([]int, frames, frames),
+	}
+	for i := 0; i < frames; i++ {
+		img.Image[i] = image.NewPaletted(image.Rect(0, 0, width, height), color.Palette{color.Black})
+		img.Delay[i] = 0
+	}
+	if err := gif.EncodeAll(&buffer, &img); err != nil {
+		t.Fatalf("failed to create animated gif: %v", err.Error())
+	}
+
+	return buffer.Bytes()
+}
+
+func CreateTestJpeg(t *testing.T, width int, height int) []byte {
+	var buffer bytes.Buffer
+
+	if err := jpeg.Encode(&buffer, image.NewRGBA(image.Rect(0, 0, width, height)), nil); err != nil {
+		t.Fatalf("failed to create jpeg: %v", err.Error())
+	}
+
+	return buffer.Bytes()
+}
+
+func CreateTestPng(t *testing.T, width int, height int) []byte {
+	var buffer bytes.Buffer
+
+	if err := png.Encode(&buffer, image.NewRGBA(image.Rect(0, 0, width, height))); err != nil {
+		t.Fatalf("failed to create png: %v", err.Error())
+	}
+
+	return buffer.Bytes()
+}