gmail

#!/bin/bash
#----------------------------------------------------------------------------------------------------
# Scipt for fetching the unread mail count of Gmail.
# Uses OAuth2 for authentication.
# Requires jq - https://stedolan.github.io/jq
#----------------------------------------------------------------------------------------------------
# Exit the script if there's no internet.
ping -c 1 8.8.8.8 > /dev/null 2>&1 || exit 33

# Path to config file.
configFile="$HOME/$BLOCK_INSTANCE"

# Exit script if no config file found.
if [[ ! -f "$configFile" ]]; then
	echo "$configFile: No such file or directory";
	exit 33;
fi

# Mouse actions for the block.
case $BLOCK_BUTTON in 
	1) xdg-open https://mail.google.com > /dev/null 2>&1 ;;
esac

# Source variables from config file.
source $configFile
eval tokenFile=$tokenFile

# Google API variables.
refreshToken=$(jq '.refresh_token' "$tokenFile" | tr -d \")

# Generates JSON to be POSTed.
generateJSON() {
	cat << EOF
{
	"client_id":"$clientID",
	"client_secret":"$clientSecret",
	"refresh_token":"$refreshToken",
	"grant_type":"refresh_token"
}
EOF
}

# Fetch the new access token.
accessToken=$(curl -s https://www.googleapis.com/oauth2/v4/token \
	-H "Content-Type: application/json" \
	-d "$(generateJSON)" | jq '.access_token' | tr -d \")

# Update access_token in tokenFile.
tmp=$(mktemp)
jq ".access_token = \"$accessToken\"" "$tokenFile" > "$tmp" && mv "$tmp" "$tokenFile"

# Fetch unread mails count.
count=$(curl -s -H "Authorization: Bearer $accessToken" \
	'https://www.googleapis.com/gmail/v1/users/me/labels/INBOX' \
	| jq '.messagesUnread')

# Display the count, if non-zero.
[[ $count = "0" ]] || echo $count