From 713ab58769c57428bb5cb440824081210575bfb0 Mon Sep 17 00:00:00 2001
From: mr-vercetti <87.milewski@gmail.com>
Date: Sat, 21 Jun 2025 14:23:49 +0200
Subject: [PATCH] Use resend instead of sendgrid for emails

---
 s3-sync-backup.sh                 |  5 ++-
 sg-send-email.sh => send-email.sh | 55 +++++++++++++++----------------
 2 files changed, 29 insertions(+), 31 deletions(-)
 rename sg-send-email.sh => send-email.sh (53%)

diff --git a/s3-sync-backup.sh b/s3-sync-backup.sh
index 98d1476..77bc51c 100755
--- a/s3-sync-backup.sh
+++ b/s3-sync-backup.sh
@@ -7,7 +7,7 @@ remote_path=""
 email_from=""
 email_name=""
 email_to=""
-send_email_script_path="/etc/sg-send-email.sh"
+send_email_script_path=""
 
 print_usage () {
    echo "Usage: "$0" -l LOCAL_PATH -r REMOTE_PATH -f EMAIL_FROM -n EMAIL_NAME -t EMAIL_TO -s SEND_EMAIL_SCRIPT_PATH"
@@ -16,7 +16,7 @@ print_usage () {
    echo "EMAIL_FROM - sender's email address"
    echo "EMAIL_NAME - sender's name"
    echo "EMAIL_TO - recipient's email adress"
-   echo "SEND_EMAIL_SCRIPT_PATH - a path to the send email script (default: /etc/sg-send-email.sh)"
+   echo "SEND_EMAIL_SCRIPT_PATH - a path to the send email script (default: /etc/send-email.sh)"
 }
 
 while getopts "l:r:f:n:t:s:h" opt
@@ -62,4 +62,3 @@ if [[ $exit_code -ne 0 ]]; then
 fi
 
 ${send_email_script_path} -f ${email_from} -n ${email_name} -t ${email_to} -s "Backup sync to S3 status: ${status}" -m "${email_message}"
-
diff --git a/sg-send-email.sh b/send-email.sh
similarity index 53%
rename from sg-send-email.sh
rename to send-email.sh
index 675f0a7..7c7a661 100755
--- a/sg-send-email.sh
+++ b/send-email.sh
@@ -1,5 +1,4 @@
-#!/usr/bin/bash 
-# Simple script to send email notifications via the Sendgrid API.
+#!/usr/bin/bash
 
 # Default values
 email_from=""
@@ -7,64 +6,64 @@ email_name=""
 email_to=""
 subject=""
 message=""
-sg_key_file="./sg_key"
+script_dir="$(dirname $0)"
+key_file="$script_dir/email_api_key"
 
 print_usage () {
-   echo "Usage: "$0" -f EMAIL_FROM -n EMAIL_NAME -t EMAIL_TO -s SUBJECT -m MESSAGE [-k SG_KEY_FILE]"
+   echo "Usage: "$0" -f EMAIL_FROM -n EMAIL_NAME -t EMAIL_TO -s SUBJECT -m MESSAGE [-k KEY_FILE]"
    echo "EMAIL_FROM - sender's email address"
    echo "EMAIL_NAME - sender's name"
    echo "EMAIL_TO - recipient's email adress"
-   echo "SUBJECT - email subject"
-   echo "MESSAGE - email message"
-   echo "SG_KEY_FILE - a path to the file with Sendgrid API key (default: ./sg_key)"
+   echo "KEY_FILE - a path to the file with API key (default: ./email_api_key)"
 }
 
 send_email () {
    maildata='{"personalizations": [{"to": [{"email": "'${email_to}'"}]}],"from": {"email": "'${email_from}'",
    "name": "'${email_name}'"},"subject": "'${subject}'","content": [{"type": "text/plain", "value": "'${message}'"}]}'
    
-   curl -X "POST" "https://api.sendgrid.com/v3/mail/send" \
-      -H "Authorization: Bearer $sg_key" \
+   curl -X "POST" "https://api.resend.com/emails" \
+      -H "Authorization: Bearer $api_key" \
       -H "Content-Type: application/json" \
       -d "$maildata"
 }
 
-while getopts "f:n:t:s:m:k:h" opt
+while getopts "k:t:n:s:m:f:h" opt
 do
    case $opt in
-      f)
-         email_from="${OPTARG}";;
-      n)
-         email_name="${OPTARG}";;
+      k)
+         key_file="${OPTARG}";;
       t)
          email_to="${OPTARG}";;
+      n)
+         email_name="${OPTARG}";;
       s)
          subject="${OPTARG}";;
       m)
          message="${OPTARG}";;
-      k)
-         sg_key_file="${OPTARG}";;
+      f)
+         email_from="${OPTARG}";;
       h)
-         print_usage
-         exit 3
-         ;;
+        print_usage
+         exit 0;
+      ;;
    esac
 done
 
-if [[ ! -f $sg_key_file ]]; then
-    echo "API key file \"$sg_key_file\" does not exist"
-    exit 1
+if [[ ! -f $key_file ]]; then
+    echo "API key file "${OPTARG}" does not exist"
+    exit 1;
 fi
 
-if [[ "$(stat -c "%a" $sg_key_file)" != "400" ]]; then
+if [[ "$(stat -c "%a" $key_file)" != "400" ]]; then
     echo "Unsafe API key file permissions"
-    exit 1
+    exit 1;
 fi
 
-if [[ "$(wc -l $sg_key_file | cut -d" " -f1)" != "1" ]]; then
-   echo "Wrong API key format"
-   exit 1
+if [[ "$(wc -l $key_file | cut -d" " -f1)" != 1 ]]; then
+   echo "Wrong API key file format"
+   exit 1;
 fi
 
-sg_key="$(cat $sg_key_file)"
+api_key="$(cat $key_file)"
+
 send_email