fix client4 post sanitization (#8219)

model/client4_test.go

@@ -0,0 +1,58 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package model
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// https://github.com/mattermost/mattermost-server/issues/8205
+func TestClient4CreatePost(t *testing.T) {
+	post := &Post{
+		Props: map[string]interface{}{
+			"attachments": []*SlackAttachment{
+				&SlackAttachment{
+					Actions: []*PostAction{
+						&PostAction{
+							Integration: &PostActionIntegration{
+								Context: map[string]interface{}{
+									"foo": "bar",
+								},
+								URL: "http://foo.com",
+							},
+							Name: "Foo",
+						},
+					},
+				},
+			},
+		},
+	}
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		attachments := PostFromJson(r.Body).Attachments()
+		assert.Equal(t, []*SlackAttachment{
+			&SlackAttachment{
+				Actions: []*PostAction{
+					&PostAction{
+						Integration: &PostActionIntegration{
+							Context: map[string]interface{}{
+								"foo": "bar",
+							},
+							URL: "http://foo.com",
+						},
+						Name: "Foo",
+					},
+				},
+			},
+		}, attachments)
+	}))
+
+	client := NewAPIv4Client(server.URL)
+	_, resp := client.CreatePost(post)
+	assert.Equal(t, http.StatusOK, resp.StatusCode)
+}