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Pimoroni Inky image download script
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""" | |
Set a cron job to run this script every 5 minutes | |
It will download the image from the given URL and render it. | |
The ETag header is used to check if the image has changed. | |
If it has, the image is downloaded and rendered. | |
If not, the script exits early. | |
The ETag is saved to a file and checked on the next run. | |
Requires pimoroni/inky library: https://github.com/pimoroni/inky#installation | |
Example crontab entry per minute: | |
* * * * * pi /usr/bin/python3 /home/pi/download-image.py https://example.com/image.jpg 0.5 | |
""" | |
import os | |
import sys | |
import requests | |
from PIL import Image | |
from inky.auto import auto | |
if len(sys.argv) == 1: | |
print(""" | |
Usage: {file} image-url [saturation] | |
""".format(file=sys.argv[0])) | |
sys.exit(1) | |
image_url = sys.argv[1] | |
etag_filename = "etag.txt" | |
etag_filepath = os.path.join(os.path.dirname(__file__), etag_filename) | |
image_filename = "image.jpg" | |
image_filepath = os.path.join(os.path.dirname(__file__), image_filename) | |
head_response = requests.head(image_url) | |
etag = head_response.headers.get("ETag") | |
if etag is None: | |
print("ETag not found in response headers. Skipping download and render") | |
sys.exit(0) | |
if os.path.exists(etag_filename): | |
with open(etag_filename, "r") as file: | |
old_etag = file.read() | |
if old_etag == etag: | |
print(f"Etag {etag} is current. Skipping download and render") | |
sys.exit(0) | |
print(f"Downloading image at {image_url}") | |
with open(etag_filename, "w") as etag_file: | |
response = requests.get(image_url) | |
with open(image_filepath, "wb") as image_file: | |
image_file.write(response.content) | |
updated_etag = response.headers.get("ETag") | |
print(f"Updating etag to {updated_etag}") | |
etag_file.write(updated_etag) | |
inky = auto(ask_user=True, verbose=True) | |
saturation = 0.5 | |
image = Image.open(image_filepath) | |
resizedimage = image.resize(inky.resolution) | |
if len(sys.argv) > 2: | |
saturation = float(sys.argv[2]) | |
inky.set_image(resizedimage, saturation=saturation) | |
inky.show() |
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