BASH Script for updating image file extension according to its mime type in a recursive manner and log it in JSON file

change_mimetype.sh

# Image Folder
IMAGE_FOLDER="./uploads"

# JSON File
JSON_FILE="./images.json"

# JSON string
JSON_STRING=""

# Loop through all image files recursively in the folder and update the extension
for image in $(find $IMAGE_FOLDER -type f); do
    # Get the file extension
    extension="${image##*.}"
    # Get the mime type
    mime_type=$(file --mime-type -b $image)
    # Get image name without extension
    image_name=$(basename $image .$extension)
    # Get image location
    image_location=$(dirname $image)
    # New image name
    new_image_name=""

    # Check if mime type and extension are the same
    if [ $extension == "jpeg" ] && [ $mime_type == "image/jpeg" ]; then
        continue
    elif [ $extension == "jpg" ] && [ $mime_type == "image/jpeg" ]; then
        continue
    elif [ $extension == "png" ] && [ $mime_type == "image/png" ]; then
        continue
    elif [ $extension == "gif" ] && [ $mime_type == "image/gif" ]; then
        continue
    elif [ $extension == "webp" ] && [ $mime_type == "image/webp" ]; then
        continue
    fi

    # Update the mime type
    if [ $mime_type == "image/jpeg" ]; then
        mv $image $image_location/$image_name.jpg
        new_image_name=$image_location/$image_name.jpg
    elif [ $mime_type == "image/png" ]; then
        mv $image $image_location/$image_name.png
        new_image_name=$image_location/$image_name.png
    elif [ $mime_type == "image/gif" ]; then
        mv $image $image_location/$image_name.gif
        new_image_name=$image_location/$image_name.gif
    elif [ $mime_type == "image/webp" ]; then
        mv $image $image_location/$image_name.webp
        new_image_name=$image_location/$image_name.webp
    fi

    # Add old and new name to json file
    JSON_STRING+="{"\"old_name"\": "\"$image\"", "\"new_name"\": "\"$new_image_name"\"},"
done

# Add the json string to the json file
echo "["${JSON_STRING%?}"]" > $JSON_FILE