Add dnsapi script for HE DDNS

dnsapi/dns_he_ddns.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env sh
+# shellcheck disable=SC2034
+dns_he_ddns_info='Hurricane Electric HE.net DDNS
+Site: dns.he.net
+Docs: github.com/acmesh-official/acme.sh/wiki/dnsapi2#dns_he_ddns
+Options:
+ HE_DDNS_KEY The DDNS key for updating the TXT record
+Author: Markku Leiniö
+'
+
+HE_DDNS_URL="https://dyn.dns.he.net/nic/update"
+
+########  Public functions #####################
+
+#Usage: dns_he_ddns_add   _acme-challenge.www.domain.com   "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
+dns_he_ddns_add() {
+  fulldomain=$1
+  txtvalue=$2
+  HE_DDNS_KEY="${HE_DDNS_KEY:-$(_readaccountconf_mutable HE_DDNS_KEY)}"
+  if [ -z "$HE_DDNS_KEY" ]; then
+    HE_DDNS_KEY=""
+    _err "You didn't specify a DDNS key for accessing the TXT record in HE API."
+    return 1
+  fi
+  #Save the DDNS key to the account conf file.
+  _saveaccountconf_mutable HE_DDNS_KEY "$HE_DDNS_KEY"
+
+  _info "Using Hurricane Electric DDNS API"
+  _debug fulldomain "$fulldomain"
+  _debug txtvalue "$txtvalue"
+
+  response="$(_post "hostname=$fulldomain&password=$HE_DDNS_KEY&txt=$txtvalue" "$HE_DDNS_URL")"
+  _info "Response: $response"
+  _contains "$response" "good" && return 0 || return 1
+}
+
+# dns_he_ddns_rm() is not implemented because the API call always updates the
+# contents of the existing record (that the API key gives access to).