Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/platform/services/imageproxy/imageproxy_test.go

@@ -0,0 +1,112 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package imageproxy
+
+import (
+	"net/url"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGetProxiedImageURL(t *testing.T) {
+	siteURL := "https://mattermost.example.com"
+	parsedURL, err := url.Parse(siteURL)
+	require.NoError(t, err)
+
+	imageURL := "https://mattermost.com/wp-content/uploads/2022/02/logoHorizontal.png"
+	proxiedURL := "https://mattermost.example.com/api/v4/image?url=https%3A%2F%2Fmattermost.com%2Fwp-content%2Fuploads%2F2022%2F02%2FlogoHorizontal.png"
+
+	proxy := ImageProxy{siteURL: parsedURL}
+
+	for _, test := range []struct {
+		Name     string
+		Input    string
+		Expected string
+	}{
+		{
+			Name:     "should proxy an image",
+			Input:    imageURL,
+			Expected: proxiedURL,
+		},
+		{
+			Name:     "should not proxy a relative image",
+			Input:    "/static/logo.png",
+			Expected: "https://mattermost.example.com/static/logo.png",
+		},
+		{
+			Name:     "should bypass opaque URLs",
+			Input:    "http:xyz123?query",
+			Expected: siteURL,
+		},
+		{
+			Name:     "should not proxy an image on the Mattermost server",
+			Input:    "https://mattermost.example.com/static/logo.png",
+			Expected: "https://mattermost.example.com/static/logo.png",
+		},
+		{
+			Name:     "should not proxy an image that has already been proxied",
+			Input:    proxiedURL,
+			Expected: proxiedURL,
+		},
+		{
+			Name:     "should not bypass protocol relative URLs",
+			Input:    "//mattermost.com/static/logo.png",
+			Expected: "https://mattermost.example.com/api/v4/image?url=https%3A%2F%2Fmattermost.com%2Fstatic%2Flogo.png",
+		},
+		{
+			Name:     "should not bypass if the host prefix is same",
+			Input:    "https://mattermost.example.com.anothersite.com/static/logo.png",
+			Expected: "https://mattermost.example.com/api/v4/image?url=https%3A%2F%2Fmattermost.example.com.anothersite.com%2Fstatic%2Flogo.png",
+		},
+		{
+			Name:     "should not bypass for user auth URLs",
+			Input:    "https://mattermost.example.com@anothersite.com/static/logo.png",
+			Expected: "https://mattermost.example.com/api/v4/image?url=https%3A%2F%2Fmattermost.example.com%40anothersite.com%2Fstatic%2Flogo.png",
+		},
+	} {
+		t.Run(test.Name, func(t *testing.T) {
+			assert.Equal(t, test.Expected, proxy.GetProxiedImageURL(test.Input))
+		})
+	}
+}
+
+func TestGetUnproxiedImageURL(t *testing.T) {
+	siteURL := "https://mattermost.example.com"
+
+	imageURL := "https://mattermost.com/wp-content/uploads/2022/02/logoHorizontal.png"
+	proxiedURL := "https://mattermost.example.com/api/v4/image?url=https%3A%2F%2Fmattermost.com%2Fwp-content%2Fuploads%2F2022%2F02%2FlogoHorizontal.png"
+
+	for _, test := range []struct {
+		Name     string
+		Input    string
+		Expected string
+	}{
+		{
+			Name:     "should remove proxy",
+			Input:    proxiedURL,
+			Expected: imageURL,
+		},
+		{
+			Name:     "should not remove proxy from a relative image",
+			Input:    "/static/logo.png",
+			Expected: "/static/logo.png",
+		},
+		{
+			Name:     "should not remove proxy from an image on the Mattermost server",
+			Input:    "https://mattermost.example.com/static/logo.png",
+			Expected: "https://mattermost.example.com/static/logo.png",
+		},
+		{
+			Name:     "should not remove proxy from a non-proxied image",
+			Input:    imageURL,
+			Expected: imageURL,
+		},
+	} {
+		t.Run(test.Name, func(t *testing.T) {
+			assert.Equal(t, test.Expected, getUnproxiedImageURL(test.Input, siteURL))
+		})
+	}
+}