Create dns_vercel.sh

diff --git a/dnsapi/dns_vercel.sh b/dnsapi/dns_vercel.sh
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+#!/usr/bin/env sh
+
+# Vercel DNS API
+#
+# This is your API token which can be acquired on the account page.
+# https://vercel.com/account/tokens
+#
+# VERCEL_TOKEN="sdfsdfsdfljlbjkljlkjsdfoiwje"
+
+VERCEL_API="https://api.vercel.com"
+
+#Usage: add _acme-challenge.www.domain.com "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
+dns_vercel_add() {
+  fulldomain=$1
+  txtvalue=$2
+  _debug fulldomain "$fulldomain"
+  _debug txtvalue "$txtvalue"
+
+  VERCEL_TOKEN="${VERCEL_TOKEN:-$(_readaccountconf_mutable VERCEL_TOKEN)}"
+
+  if [ -z "$VERCEL_TOKEN" ]; then
+    VERCEL_TOKEN=""
+    _err "You have not set the Vercel API token yet."
+    _err "Please visit https://vercel.com/account/tokens to generate it."
+    return 1
+  fi
+
+  _saveaccountconf_mutable VERCEL_TOKEN "$VERCEL_TOKEN"
+
+  if ! _get_root "$fulldomain"; then
+    _err "invalid domain"
+    return 1
+  fi
+
+  _debug _sub_domain "$_sub_domain"
+  _debug _domain "$_domain"
+
+  _info "Adding record"
+  if _vercel_rest POST "v2/domains/$_domain/records" "{\"type\":\"TXT\",\"name\":\"$_sub_domain\",\"value\":\"$txtvalue\"}"; then
+    if printf -- "%s" "$response" | grep "\"uid\":\"" >/dev/null; then
+      _info "Added"
+      return 0
+    else
+      _err "Unexpected response while adding text record."
+      return 1
+    fi
+  fi
+  _err "Add txt record error."
+}
+
+dns_vercel_rm() {
+  fulldomain=$1
+  txtvalue=$2
+
+  if ! _get_root "$fulldomain"; then
+    _err "invalid domain"
+    return 1
+  fi
+
+  _vercel_rest GET "v2/domains/$_domain/records"
+
+  count=$(printf "%s\n" "$response" | _egrep_o "\"name\":\"$_sub_domain\",[^{]*\"type\":\"TXT\"" | wc -l | tr -d " ")
+
+  if [ "$count" = "0" ]; then
+    _info "Don't need to remove."
+  else
+    _record_id=$(printf "%s" "$response" | _egrep_o "\"id\":[^,]*,\"slug\":\"[^,]*\",\"name\":\"$_sub_domain\",[^{]*\"type\":\"TXT\",\"value\":\"$txtvalue\"" | cut -d: -f2 | cut -d, -f1 | tr -d '"')
+
+    if [ "$_record_id" ]; then
+      echo "$_record_id" | while read -r item; do
+        if _vercel_rest DELETE "v2/domains/$_domain/records/$item"; then
+          _info "removed record" "$item"
+          return 0
+        else
+          _err "failed to remove record" "$item"
+          return 1
+        fi
+      done
+    fi
+  fi
+}
+
+####################  Private functions below ##################################
+#_acme-challenge.www.domain.com
+#returns
+# _sub_domain=_acme-challenge.www
+# _domain=domain.com
+_get_root() {
+  domain="$1"
+  ep="$2"
+  i=1
+  p=1
+  while true; do
+    h=$(printf "%s" "$domain" | cut -d . -f $i-100)
+    if [ -z "$h" ]; then
+      #not valid
+      return 1
+    fi
+
+    if ! _vercel_rest GET "v4/domains/$h"; then
+      return 1
+    fi
+
+    if _contains "$response" "\"name\":\"$h\"" >/dev/null; then
+      _sub_domain=$(printf "%s" "$domain" | cut -d . -f 1-$p)
+      _domain=$h
+      return 0
+    fi
+    p=$i
+    i=$(_math "$i" + 1)
+  done
+  return 1
+}
+
+_vercel_rest() {
+  m="$1"
+  ep="$2"
+  data="$3"
+
+  path="$VERCEL_API/$ep"
+
+  export _H1="Content-Type: application/json"
+  export _H2="Authorization: Bearer $VERCEL_TOKEN"
+
+  if [ "$m" != "GET" ]; then
+    _secure_debug2 data "$data"
+    response="$(_post "$data" "$path" "" "$m")"
+  else
+    response="$(_get "$path")"
+  fi
+  _ret="$?"
+  _code="$(grep "^HTTP" "$HTTP_HEADER" | _tail_n 1 | cut -d " " -f 2 | tr -d "\\r\\n")"
+  _debug "http response code $_code"
+  _secure_debug2 response "$response"
+  if [ "$_ret" != "0" ]; then
+    _err "error $ep"
+    return 1
+  fi
+
+  response="$(printf "%s" "$response" | _normalizeJson)"
+  return 0
+}