Merge pull request #10 from danielbprice/master

feat: Add WrapSilent() to wrap an error but not include it in the JSON body
solves #11

problem.go

@@ -194,6 +194,15 @@ func Wrap(err error) Option {
 	})
 }
 
+// WrapSilent wraps an error inside of the Problem without placing the wrapped
+// error into the problem's JSON body.  Useful for cases where the underlying
+// error needs to be preserved but not transmitted to the user.
+func WrapSilent(err error) Option {
+	return optionFunc(func(problem *Problem) {
+		problem.reason = err
+	})
+}
+
 // Type sets the type URI (typically, with the "http" or "https" scheme) that identifies the problem type.
 // When dereferenced, it SHOULD provide human-readable documentation for the problem type
 func Type(uri string) Option {

problem_test.go

@@ -253,6 +253,16 @@ func TestNestedErrors(t *testing.T) {
 	if errors.Unwrap(unwrappedProblem) != nil {
 		t.Fatalf("Expected unwrappedProblem has no reason")
 	}
+	// See wrapped error in 'reason'
+	if p.JSONString() != `{"reason":"{\"status\":404,\"title\":\"Root Problem\"}","title":"high level error msg"}` {
+		t.Fatalf("Unexpected contents %s in problem", p.JSONString())
+	}
+
+	p = problem.New(problem.WrapSilent(rootProblem), problem.Title("high level error msg"))
+	// We should not see a "reason" here
+	if p.JSONString() != `{"title":"high level error msg"}` {
+		t.Fatalf("Unexpected contents %s in problem", p.JSONString())
+	}
 }
 
 func TestOsErrorInProblem(t *testing.T) {