From 5eb0007dc57890fb7fc2c1163720e68a1cfd4d37 Mon Sep 17 00:00:00 2001
From: Alexandre Oliveira <rockytvbr@gmail.com>
Date: Sun, 18 Jun 2017 22:38:06 -0300
Subject: [PATCH] Add DuckDNS DNS API

---
 dnsapi/dns_duckdns.sh | 90 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 dnsapi/dns_duckdns.sh

diff --git a/dnsapi/dns_duckdns.sh b/dnsapi/dns_duckdns.sh
new file mode 100644
index 00000000..a0f49931
--- /dev/null
+++ b/dnsapi/dns_duckdns.sh
@@ -0,0 +1,90 @@
+#!/usr/bin/env sh
+
+# DNS API for DuckDNS
+#
+# Report bugs at https://github.com/RockyTV/acme.sh/issues
+#
+# Set this environment variable to match your DuckDNS account token:
+# DUCKDNS_TOKEN=aaaaaaaa-bbbb-cccc-dddddddddddd
+
+########  Public functions #####################
+# Usage: dns_duckdns_add   _acme-challenge.www.domain.com   "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
+dns_duckdns_add() {
+  fulldomain=$1
+  txtvalue=$2
+
+  _info "Adding TXT record to DuckDNS domain"
+  _debug "fulldomain: $fulldomain"
+  _debug "txtvalue: $txtvalue"
+
+  if ! _get_root "$fulldomain"; then
+    _err "Domain does not exist."
+    return 1
+  fi
+  
+  if [ -z "$DUCKDNS_TOKEN" ]; then
+    DUCKDNS_TOKEN=""
+    _err "DuckDNS token is not defined."
+    _err "Please export your account token to DUCKDNS_TOKEN and try again."
+    return 1
+  fi
+  _saveaccountconf DUCKDNS_TOKEN "$DUCKDNS_TOKEN"
+  
+  duckdns_url="https://www.duckdns.org/update?domains=$_domain&token=$DUCKDNS_TOKEN&txt=$txtvalue"
+  response=$(_get $duckdns_url)
+  if [ $response != "OK" ]; then
+    _err "Failed to update TXT record for DuckDNS domain."
+    return 1
+  fi
+  
+  return 0
+}
+
+# Usage: fulldomain txtvalue
+# Remove the txt record after validation.
+dns_duckdns_rm() {
+  fulldomain=$1
+  txtvalue=$2
+  
+  _info "Removing TXT record from DuckDNS domain"
+  _debug "fulldomain: $fulldomain"
+  _debug "txtvalue: $txtvalue"
+
+  DUCKDNS_TOKEN="$(_read_conf "$ACCOUNT_CONF_PATH" "DUCKDNS_TOKEN")"
+  _debug "DuckDNS token: $DUCKDNS_TOKEN"
+
+  if ! _get_root "$fulldomain"; then
+    _err "Domain does not exist."
+    return 1
+  fi
+
+  duckdns_url="https://www.duckdns.org/update?domains=$_domain&token=$DUCKDNS_TOKEN&txt=&clear=true"
+  response=$(_get $duckdns_url)
+  if [ $response != "OK" ]; then
+    _err "Failed to update TXT record for DuckDNS domain."
+    return 1
+  fi
+  
+  return 0
+}
+
+####################  Private functions below ##################################
+# _acme-challenge.www.domain.com
+# returns
+# _domain=domain.com
+_get_root() {
+  domain=$1
+  i="$(echo "$fulldomain" | tr '.' ' ' | wc -w)"
+  i=$(_math "$i" - 1)
+
+  while true; do
+    h=$(printf "%s" "$domain" | cut -d . -f "$i"-100)
+    if [ -z "$h" ]; then
+      return 1
+    fi
+    _domain="$h"
+    return 0
+  done
+  _debug "$domain not found"
+  return 1
+}
\ No newline at end of file