Add notification (#2241)

* add cron notify

* fix format

* fix format

notify/sendgrid.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env sh
+
+#Support SENDGRID.com api
+
+#SENDGRID_API_KEY=""
+#SENDGRID_TO="xxxx@xxx.com"
+#SENDGRID_FROM="xxxx@cccc.com"
+
+sendgrid_send() {
+  _subject="$1"
+  _content="$2"
+  _statusCode="$3" #0: success, 1: error 2($RENEW_SKIP): skipped
+  _debug "_statusCode" "$_statusCode"
+
+  SENDGRID_API_KEY="${SENDGRID_API_KEY:-$(_readaccountconf_mutable SENDGRID_API_KEY)}"
+  if [ -z "$SENDGRID_API_KEY" ]; then
+    SENDGRID_API_KEY=""
+    _err "You didn't specify a sendgrid api key SENDGRID_API_KEY yet ."
+    _err "You can get yours from here https://sendgrid.com"
+    return 1
+  fi
+  _saveaccountconf_mutable SENDGRID_API_KEY "$SENDGRID_API_KEY"
+
+  SENDGRID_TO="${SENDGRID_TO:-$(_readaccountconf_mutable SENDGRID_TO)}"
+  if [ -z "$SENDGRID_TO" ]; then
+    SENDGRID_TO=""
+    _err "You didn't specify an email to SENDGRID_TO receive messages."
+    return 1
+  fi
+  _saveaccountconf_mutable SENDGRID_TO "$SENDGRID_TO"
+
+  SENDGRID_FROM="${SENDGRID_FROM:-$(_readaccountconf_mutable SENDGRID_FROM)}"
+  if [ -z "$SENDGRID_FROM" ]; then
+    SENDGRID_FROM=""
+    _err "You didn't specify an email to SENDGRID_FROM receive messages."
+    return 1
+  fi
+  _saveaccountconf_mutable SENDGRID_FROM "$SENDGRID_FROM"
+
+  export _H1="Authorization: Bearer $SENDGRID_API_KEY"
+  export _H2="Content-Type: application/json"
+
+  _content="$(echo "$_content" | _json_encode)"
+  _data="{\"personalizations\": [{\"to\": [{\"email\": \"$SENDGRID_TO\"}]}],\"from\": {\"email\": \"$SENDGRID_FROM\"},\"subject\": \"$_subject\",\"content\": [{\"type\": \"text/plain\", \"value\": \"$_content\"}]}"
+  response="" #just make shellcheck happy
+  if _post "$_data" "https://api.sendgrid.com/v3/mail/send"; then
+    if [ -z "$response" ]; then
+      _info "sendgrid send sccess."
+      return 0
+    fi
+  fi
+  _err "sendgrid send error."
+  _err "$response"
+  return 1
+
+}