Send EMAIL via SendGrid API using Shell Script

sendEmail.sh

#!/bin/bash
# Author: Amith Chandrappa

# Usage
# Options:
# 	-t: To Emails, Separated by ";"
# 	-c: CC Emails, Separated by ";"
# 	-b: BCC Emails, Separated by ";"
# 	-s: Subject
# 	-o: Email body
# 	-a: Attachment Files, Separated by ";"
#
#	Example: 
#	sh sendEmail.sh 
#		-t 'to1@gmail.com;to2@gmail.com' 
#		-c 'cc1@gmail.com;cc2@gmail.com' 
#		-b 'bcc1@gmail.com;bcc2@gmail.com' 
#		-s 'FINAL SCRIPT' 
#		-o '<p>Email body goes here</p>' 
#		-a '/tmp/test.sh;/tmp/test2.sh'

# Your Sendgrid API Key
SENDGRID_API_KEY="<YOUR API KEY>"

FROM_NAME="<FROM NAME>"
FROM_EMAIL="<FROM EMAIL ADDRESS>"

# Get the arguments
while getopts t:c:b:s:o:a: flag
do
    case "${flag}" in
        t) to=${OPTARG};;
        c) cc=${OPTARG};;
        b) bcc=${OPTARG};;
		s) subject=${OPTARG};;
		o) body=${OPTARG};;
		a) attachments=${OPTARG};;
    esac
done


# Start building the JSON
sendGridJson="{\"personalizations\": [{";

# Convert the String to Array, with the delimiter as ";"
IFS='; ' read -r -a to_array <<< "$to"
IFS='; ' read -r -a cc_array <<< "$cc"
IFS='; ' read -r -a bcc_array <<< "$bcc"
IFS='; ' read -r -a attachments_array <<< "$attachments"


if [ ${#to_array[@]} != 0 ] 
then
	sendGridJson="${sendGridJson} \"to\": ["
	
	for email in "${to_array[@]}"
	do
	    sendGridJson="${sendGridJson} {\"email\": \"$email\"},"
	done

	sendGridJson=`echo ${sendGridJson} | sed 's/.$//'`
	sendGridJson="${sendGridJson} ],"

	if [ ${#cc_array[@]} == 0 ] && [ ${#bcc_array[@]} == 0 ] 
	then
		sendGridJson=`echo ${sendGridJson} | sed 's/.$//'`
	fi
fi

if [ ${#cc_array[@]} != 0 ] 
then
	sendGridJson="${sendGridJson} \"cc\": ["
	
	for email in "${cc_array[@]}"
	do
	    sendGridJson="${sendGridJson} {\"email\": \"$email\"},"
	done

	sendGridJson=`echo ${sendGridJson} | sed 's/.$//'`
	sendGridJson="${sendGridJson} ],"

	if [ ${#bcc_array[@]} == 0 ] 
	then
		sendGridJson=`echo ${sendGridJson} | sed 's/.$//'`
	fi
fi

if [ ${#bcc_array[@]} != 0 ] 
then
	sendGridJson="${sendGridJson} \"bcc\": ["
	
	for email in "${bcc_array[@]}"
	do
	    sendGridJson="${sendGridJson} {\"email\": \"$email\"},"
	done

	sendGridJson=`echo ${sendGridJson} | sed 's/.$//'`
	sendGridJson="${sendGridJson} ]"
fi

sendGridJson="${sendGridJson} }],\"from\": {\"email\": \"${FROM_EMAIL}\",\"name\": \"${FROM_NAME}\"},\"subject\":\"${subject}\",\"content\": [{\"type\": \"text/html\",\"value\": \"${body}\"}],"

if [ ${#attachments_array[@]} != 0 ] 
then
	sendGridJson="${sendGridJson} \"attachments\": ["
	
	for attachment in "${attachments_array[@]}"

	# Converting the File Content to Base64
	# For OSX use base64 <fileName>
	# For linux use base64 -w 0 <fileName>

	do
		base64_content=$(base64 -w 0${attachment})
		fileName="$(basename $attachment)"
	    sendGridJson="${sendGridJson} {\"content\": \"${base64_content}\",\"type\": \"text/plain\",\"filename\": \"${fileName}\"},"
	done

	sendGridJson=`echo ${sendGridJson} | sed 's/.$//'`
	sendGridJson="${sendGridJson} ]"
else
	sendGridJson=`echo ${sendGridJson} | sed 's/.$//'`
fi

sendGridJson="${sendGridJson} }"

#Generate a Random File to hole the POST data
tfile=$(mktemp /tmp/sendgrid.XXXXXXXXX)
echo $sendGridJson > $tfile

# Send the http request to SendGrid
curl --request POST \
  --url https://api.sendgrid.com/v3/mail/send \
  --header 'Authorization: Bearer '$SENDGRID_API_KEY \
  --header 'Content-Type: application/json' \
  --data @$tfile

Hello,

Using simple email without attachment works, but doesn't work when attaching files.
Using Linux ubuntu it doesn't work for me, base64 command fails (base64: invalid wrap size) at https://gist.github.com/amithgc/fe5f1e4821e4a9809117513eb92a362a#file-sendemail-sh-L114

The correct way to use base64 is "base64_content=$(base64 -w 0 < ${attachment})" instead of "base64_content=$(base64 -w 0${attachment})".

Cheers,
François