Detect/notify when web page etag changes
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README.md

etags

Checks urls for etags and reports back any changed urls. Requires DynamoDb, or something like it. For a lightweight, self-hosted version, you can try DynamoDb Bolt.

Usage: etags.py <url> ...

Environment variables

  • ETAGS_BUS_NAME: If set, this will notify on an EventBridge bus
  • ETAGS_TABLE: Table name for DynamoDB
  • DDB_ENDPOINT: By default, the application will use DynamoDb's standard endpoint Set this variable if using a non-standard endpoint or DynamoDb Bolt

This uses boto3, so all AWS Environment Variables will control authentication. If using DynamoDb Bolt, the following must be set, but can be dummy values:

  • AWS_DEFAULT_REGION
  • AWS_ACCESS_KEY_ID
  • AWS_SECRET_ACCESS_KEY

Running as Docker

Latest version can be found at https://r.lerch.org/repo/etags/tags/. Versions are tagged with the short hash of the git commit, and are built as a multi-architecture image based on a scratch image.

You can run the docker image with a command like:

docker run \
  --rm                              \
  --tmpfs /tmp                      \
  --name=ddbbolt                    \
  -e AWS_DEFAULT_REGION=us-west-2   \
  -e AWS_ACCESS_KEY_ID=AKIAEXAMPLE  \
  -e AWS_SECRET_ACCESS_KEY=dummy    \
  -e DDB_ENDPOINT=set_if_applicable \
  -e ETAGS_TABLE=etags              \
  r.lerch.org/etags:0af6716