Script for converting file(s) using TinyPNG API.

tinypng_convert.sh

#!/bin/bash

# A TinyPNG API script that at least works... somewhat.
# This isn't a pretty script, but it works. Don't h8 me.

# This script is meant for singular files. But you can use convert all files in a folder using a `for` loop.
# Example: `for image in *.jpg; do ./tinypng_convert.sh $image; done`

# What this script does:
# - Takes one file as input
# - Submits to TinyPNG API.
# - Downloads file into a new filename based on a few parameters (see description of `FILENAME_ADDON`)
# - Returns a few stats.

# Requirements: curl, jq
# Easy to get on Debian/Ubuntu: `sudo apt install curl jq`
# You can probably get it on other distros, but I don't use those so ¯\_(ツ)_/¯
# curl: https://curl.haxx.se/
# jq: https://stedolan.github.io/jq/

# Get TinyPNG API key: https://tinypng.com/
# 500 free conversions per month.
TINYPNG_API_KEY=""

# Filename addon is placed between the original filename and the new extension based on TinyPNG's API.
# Basically with the following parameters:
# Original filename: "TinyPNG_Test_File.png"
# Filetype returned from TinyPNG API: "image/jpeg", which is translated to: "jpg"
# FILENAME_ADDON: "TinyPNG"
# ... the new filename would be turned into: "TinyPNG_Test_File.TinyPNG.jpg"
# 
# ** If FILENAME_ADDON is empty, it would be: "TinyPNG_Test_File.jpg"
# ** If filetypes DON'T CHANGE (which is 99% of the cases), this will REPLACE the original file.
# ** Consider this your warning.
# 
# Hope that makes sense
FILENAME_ADDON="t"

if [[ -z "$1" ]]; then
    echo "Missing parameter: file"
    exit 1
fi

FILE="$@"
echo "Submitting $FILE to TinyPNG API."
RESPONSE=$(curl --silent --data-binary "@$FILE" --user "api:$TINYPNG_API_KEY" https://api.tinify.com/shrink)

# Get the download URL of the tinified file.
DOWNLOAD_URL=$(echo $RESPONSE | jq -r '.output.url')

echo "Parsing response from TinyPNG"
# Get filesizes in human-readable formats.
OLD_SIZE=$(echo $RESPONSE | jq '.input.size' | numfmt --to=si --suffix=B)
NEW_SIZE=$(echo $RESPONSE | jq '.output.size' | numfmt --to=si --suffix=B)

# Correct filetype
TYPE=$(echo $RESPONSE | jq -r '.output.type' | sed 's/image\///g')
if [[ $TYPE == "jpeg" ]]; then
    TYPE="jpg"
fi

# Create filename based on filetype.
NEW_FILENAME="$(echo $FILE | sed 's/\.[^.]*$//')"

# Only apply filename addon if it's not empty.
if [[ $FILENAME_ADDON == "" ]]; then
    NEW_FILENAME="$NEW_FILENAME.$TYPE"
else
    NEW_FILENAME="$NEW_FILENAME.$FILENAME_ADDON.$TYPE"
fi

echo "Downloading new file from TinyPNG"
curl --silent -o "$NEW_FILENAME" "$DOWNLOAD_URL"

echo "Converted $FILE: $OLD_SIZE => $NEW_SIZE"
echo "New filename: $NEW_FILENAME"