Initial Commit of Ephemeral Message Support for System Admins (#8611)

Fixed Permission Test

Fixed and extended ephemeral message tests; Removed Online/Activity Updates

Set Create Time to current time

gofmt

model/post.go

@@ -80,6 +80,11 @@ type Post struct {
 	HasReactions  bool            `json:"has_reactions,omitempty"`
 }
 
+type PostEphemeral struct {
+	UserID string `json:"user_id"`
+	Post   *Post  `json:"post"`
+}
+
 type PostPatch struct {
 	IsPinned     *bool            `json:"is_pinned"`
 	Message      *string          `json:"message"`
@@ -432,6 +437,11 @@ func (o *Post) WithRewrittenImageURLs(f func(string) string) *Post {
 	return &copy
 }
 
+func (o *PostEphemeral) ToUnsanitizedJson() string {
+	b, _ := json.Marshal(o)
+	return string(b)
+}
+
 // RewriteImageURLs takes a message and returns a copy that has all of the image URLs replaced
 // according to the function f. For each image URL, f will be invoked, and the resulting markdown
 // will contain the URL returned by that invocation instead.