Provide SSL certificate verification options

README.md

@@ -215,6 +215,10 @@ For the HTTP checks, you can set these attributes:
 
   * **probefilters** - Region from which the check should originate. One of NA, EU, APAC, or LATAM. Should be in the format "region:NA"
 
+  * **verifycertificate** - Enable monitoring of SSL/TLS certificate.
+
+  * **ssldowndaysbefore** - Days prior to certificate expiring to consider down.
+
 #### TCP specific attributes ####
 
 For the TCP checks, you can set these attributes:

pingdom/resource_pingdom_check.go

@@ -181,6 +181,16 @@ func resourcePingdomCheck() *schema.Resource {
 				Optional: true,
 				ForceNew: false,
 			},
+			"verifycertificate": {
+				Type:     schema.TypeBool,
+				Optional: true,
+				ForceNew: false,
+			},
+			"ssldowndaysbefore": {
+				Type:     schema.TypeInt,
+				Optional: true,
+				ForceNew: false,
+			},
 		},
 	}
 }
@@ -210,6 +220,8 @@ type commonCheckParams struct {
 	ProbeFilters             string
 	StringToSend             string
 	StringToExpect           string
+	VerifyCertificate        bool
+	SSLDownDaysBefore        int
 }
 
 func sortString(input string, seperator string) string {
@@ -335,6 +347,14 @@ func checkForResource(d *schema.ResourceData) (pingdom.Check, error) {
 		checkParams.StringToExpect = v.(string)
 	}
 
+	if v, ok := d.GetOk("verifycertificate"); ok {
+		checkParams.VerifyCertificate = v.(bool)
+	}
+
+	if v, ok := d.GetOk("ssldowndaysbefore"); ok {
+		checkParams.SSLDownDaysBefore = v.(int)
+	}
+
 	checkType := d.Get("type")
 	switch checkType {
 	case "http":
@@ -361,6 +381,8 @@ func checkForResource(d *schema.ResourceData) (pingdom.Check, error) {
 			ProbeFilters:             checkParams.ProbeFilters,
 			UserIds:                  checkParams.UserIds,
 			TeamIds:                  checkParams.TeamIds,
+			VerifyCertificate:        &checkParams.VerifyCertificate,
+			SSLDownDaysBefore:        &checkParams.SSLDownDaysBefore,
 		}, nil
 	case "ping":
 		return &pingdom.PingCheck{
@@ -565,6 +587,12 @@ func resourcePingdomCheckRead(d *schema.ResourceData, meta interface{}) error {
 		if err := d.Set("postdata", ck.Type.HTTP.PostData); err != nil {
 			return err
 		}
+		if err := d.Set("verifycertificate", ck.Type.HTTP.VerifyCertificate); err != nil {
+			return err
+		}
+		if err := d.Set("ssldowndaysbefore", ck.Type.HTTP.SSLDownDaysBefore); err != nil {
+			return err
+		}
 
 		if v, ok := ck.Type.HTTP.RequestHeaders["User-Agent"]; ok {
 			if strings.HasPrefix(v, "Pingdom.com_bot_version_") {