fix https://github.com/Neilpang/acme.sh/issues/1941

cache dns zones response

dnsapi/dns_cf.sh

@@ -34,6 +34,9 @@ dns_cf_add() {
   _saveaccountconf_mutable CF_Key "$CF_Key"
   _saveaccountconf_mutable CF_Email "$CF_Email"
 
+  _DOMAIN_CF_ZONES_CACHE_NAME_="$(echo "${CF_Email}_CF_ZONES_" | tr '@.' '__')"
+  _cleardomainconf "$_DOMAIN_CF_ZONES_CACHE_NAME_"
+
   _debug "First detect the root zone"
   if ! _get_root "$fulldomain"; then
     _err "invalid domain"
@@ -58,9 +61,12 @@ dns_cf_add() {
   #  if [ "$count" = "0" ]; then
   _info "Adding record"
   if _cf_rest POST "zones/$_domain_id/dns_records" "{\"type\":\"TXT\",\"name\":\"$fulldomain\",\"content\":\"$txtvalue\",\"ttl\":120}"; then
-    if printf -- "%s" "$response" | grep "$fulldomain" >/dev/null; then
+    if _contains "$response" "$fulldomain"; then
       _info "Added, OK"
       return 0
+    elif _contains "$response" "The record already exists"; then
+      _info "Already exists, OK"
+      return 0
     else
       _err "Add txt record error."
       return 1
@@ -99,11 +105,16 @@ dns_cf_rm() {
     return 1
   fi
 
+  _DOMAIN_CF_ZONES_CACHE_NAME_="$(echo "${CF_Email}_CF_ZONES_" | tr '@.' '__')"
+
   _debug "First detect the root zone"
   if ! _get_root "$fulldomain"; then
+    _cleardomainconf "$_DOMAIN_CF_ZONES_CACHE_NAME_"
     _err "invalid domain"
     return 1
   fi
+  _cleardomainconf "$_DOMAIN_CF_ZONES_CACHE_NAME_"
+
   _debug _domain_id "$_domain_id"
   _debug _sub_domain "$_sub_domain"
   _debug _domain "$_domain"
@@ -143,6 +154,21 @@ dns_cf_rm() {
 # _domain=domain.com
 # _domain_id=sdjkglgdfewsdfg
 _get_root() {
+
+  _cf_zones="$(_readdomainconf $_DOMAIN_CF_ZONES_CACHE_NAME_)"
+  _debug2 "_cf_zones" "$_cf_zones"
+  if [ -z "$_cf_zones" ]; then
+    _debug "$_DOMAIN_CF_ZONES_CACHE_NAME_ is none, so get it."
+    if ! _cf_rest GET "zones"; then
+      return 1
+    fi
+    _cf_zones="$response"
+    _savedomainconf "$_DOMAIN_CF_ZONES_CACHE_NAME_" "$(echo "$_cf_zones" | _base64)"
+  else
+    _debug "$_DOMAIN_CF_ZONES_CACHE_NAME_ found"
+    _cf_zones="$(echo "$_cf_zones" | _dbase64)"
+  fi
+
   domain=$1
   i=2
   p=1
@@ -154,12 +180,8 @@ _get_root() {
       return 1
     fi
 
-    if ! _cf_rest GET "zones?name=$h"; then
-      return 1
-    fi
-
-    if _contains "$response" "\"name\":\"$h\"" >/dev/null; then
-      _domain_id=$(printf "%s\n" "$response" | _egrep_o "\[.\"id\":\"[^\"]*\"" | head -n 1 | cut -d : -f 2 | tr -d \")
+    if _contains "$_cf_zones" "\"name\":\"$h\"" >/dev/null; then
+      _domain_id=$(printf "%s\n" "$_cf_zones" | _egrep_o "\[.\"id\":\"[^\"]*\"" | head -n 1 | cut -d : -f 2 | tr -d \")
       if [ "$_domain_id" ]; then
         _sub_domain=$(printf "%s" "$domain" | cut -d . -f 1-$p)
         _domain=$h