Script to download files from AWS S3 to a specified location.

download-from-s3.sh

#!/usr/bin/env bash

# Replace the text PATH_TO_YOUR_DROPBOX_FOLDER with the path to your Dropbox folder (e.g. /home/user/Dropbox)
DROPBOX_FOLDER="PATH_TO_YOUR_DROPBOX_FOLDER"

# DO NOT CHANGE ANYTHING BELOW THIS LINE
# ======================================

PDF_MERGE_WORK_FOLDER="$HOME/pdfmerge"

# Let me know you are starting.

osascript -e 'display notification "Starting PDF Merge cron" with title "PDF Merge"'

# Set date prefix

DATE_STR=$(date +%y-%d-%m)
LOG_FILE=logs/$(date +%y-%d-%m-%H-%M-%S).log

# Delete existing log & suppress error if it doesn't exist. 

rm $LOG_FILE 2> /dev/null

# Redirect stdout ( > ) into a named pipe ( >() ) running "tee"

exec > >(tee -i $LOG_FILE)

# Redirect stderr to stdout so we capture both.

exec 2>&1

# Switch to the work folder

cd $PDF_MERGE_WORK_FOLDER

# Create required subfolders

mkdir -p logs

# Set variables for resources

S3_PATH="https://pdf-merge-prod.s3.amazonaws.com/merged"
HR_FILE_NAME=${DATE_STR}-HR.pdf
LR_FILE_NAME=${DATE_STR}-LR.pdf 

REMOTE_FILES=(
    $HR_FILE_NAME 
    $LR_FILE_NAME
)

# Loop through files & download if needed.

for FILE_NAME in ${REMOTE_FILES[@]}; do
    # Start downloading HR file

    echo "Downloading $FILE_NAME"

    LOCAL_FILE="$DROP_BOX_FOLDER/Merged PDFs/$FILE_NAME"

    if [ -f "$LOCAL_FILE" ]; then
        echo "$LOCAL_FILE exists. Will not download."
        osascript -e "display notification \"$LOCAL_FILE exists. Will not download.\" with title \"PDF Merge\""
    else 
        echo "$LOCAL_FILE does not exist. Downloading."
        osascript -e "display notification \"$LOCAL_FILE does not exist. Downloading.\" with title \"PDF Merge\""
        /usr/local/bin/wget $S3_PATH/$FILE_NAME -O $LOCAL_FILE
    fi

    # wget writes a file regardless if the source is empty.
    # Delete HR file if empty.

    if [ ! -s $LOCAL_FILE ]; then 
        echo "$LOCAL_FILE is empty. Deleting."
        rm $LOCAL_FILE 2> /dev/null
    fi
done

# Let me know you are finished.

osascript -e 'display notification "Merged files were downloaded to DropBox" with title "PDF Merge"'