From b2d7a1821e431a46cad2c93b11c858ef129bd564 Mon Sep 17 00:00:00 2001
From: Matthew Holt <mholt@users.noreply.github.com>
Date: Tue, 16 Aug 2016 13:50:56 -0600
Subject: [PATCH] Skip solving challenges when authz is already valid (fixes
 #267)

---
 acme/client.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/acme/client.go b/acme/client.go
index ef53d82d..622403f4 100644
--- a/acme/client.go
+++ b/acme/client.go
@@ -509,6 +509,10 @@ func (c *Client) solveChallenges(challenges []authorizationResource) map[string]
 	// loop through the resources, basically through the domains.
 	failures := make(map[string]error)
 	for _, authz := range challenges {
+		if authz.Body.Status == "valid" {
+			// Boulder might recycle already-valid authz, see issue #267
+			continue
+		}
 		// no solvers - no solving
 		if solvers := c.chooseSolvers(authz.Body, authz.Domain); solvers != nil {
 			for i, solver := range solvers {