Website Stalker

Track changes on websites via git

This tool checks all the websites listed in its config. When a change is detected, the new site is added to a git commit. It can then be inspected via normal git tooling.

Basically it's curl, sed++ and then git commit in a neat package.

See it in action (literally in GitHub Actions).

Install

GitHub Releases
Arch Linux User Repository (AUR)
Docker Hub Image
Via rust and cargo: Clone → cargo install --path .

Usage

GitHub Actions

Check out website-stalker-example which runs within GitHub actions.

Locally

First create a new folder / git repository for tracking website changes

mkdir personal-stalker
cd personal-stalker
git init
website-stalker example-config > website-stalker.yaml

Add your favorite website to the configuration file website-stalker.yaml. Also make sure to set the value of from to an email address of yours.
```
website-stalker example-config > website-stalker.yaml
nano website-stalker.yaml
```
Run your newly added website. If you added https://apple.com/newsroom use something like this to test if everything works like you want:
```
website-stalker run apple
```
Set up a cronjob / systemd.timer executing the following command occasionally
```
website-stalker run --all --commit
```

Config Example

The config describes a list of sites. Each site has a URL. Additionally, each site can have editors which are used before saving the file. Each editor manipulates the content of the URL.

# This is an example config
# The filename should be `website-stalker.yaml`
# and it should be in the working directory where you run website-stalker.
#
# For example run `website-stalker example-config > website-stalker.yaml`.
# Adapt the config to your needs and set the FROM email address which is used as a request header:
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/From
#
# And then do a run via `website-stalker run --all`.
---
from: my-email-address
sites:
  - url: "https://edjopato.de/post/"
    editors:
      - css_select: article
      - css_remove: a
      - html_prettify
      - regex_replace:
          pattern: "(Lesezeit): \\d+ \\w+"
          replace: $1
  - url: "https://edjopato.de/robots.txt"

There is a bigger config in my example repository. The example repository is also used by me to detect changes of interesting sites.

Global Options

Options which are globally configured at the root level of the configuration file website-stalker.yaml.

`from`

Used as the From header in the web requests. It is a required field.

The idea here is to provide a way for a website host to contact whoever is doing something to their web server. As this tool is self-hosted and can be run as often as the user likes this can annoy website hosts. While this tool is named "stalker" and is made to track websites it is not intended to annoy people.

This tool sets the User-Agent header to website-stalker/<version> https://github.com/EdJoPaTo/website-stalker and the From header to the user configured value. This way both the creator and the user of this tool can be reached in case of problems.

from: my-email-address

Alternatively you can specify FROM via environment variable

export WEBSITE_STALKER_FROM=my-email-address

Per Site Options

Options available per site besides the editors which are explained below.

`url`

One or multiple URLs can be specified. The simple form is a single URL:

sites:
  - url: "https://edjopato.de/"
  - url: "https://edjopato.de/post/"

It's also possible to specify multiple URL at the same time. This is helpful when multiple sites are sharing the same options (like editors).

sites:
  - url:
      - "https://edjopato.de/"
      - "https://edjopato.de/post/"

`accept_invalid_certs`

Allows HTTPS connections with self-signed or invalid / expired certificates.

From reqwests documentation:

You should think very carefully before using this method. If invalid certificates are trusted, any certificate for any site will be trusted for use. This includes expired certificates. This introduces significant vulnerabilities, and should only be used as a last resort.

Do you have a need for self-signed certificates or the usage of the system certificate store? Please share about it in Issue #39.

sites:
  - url: "https://edjopato.de/post/"
    accept_invalid_certs: true

`http1_only`

Only use HTTP/1 for the web request.

Back-ends might use HTTP/2 fingerprinting which could result in different or unusable output depending on what the back-end assumes about the client. HTTP/1 is a simpler protocol which does not allow such kinds of back-end optimizations.

sites:
  - url: "https://edjopato.de/post/"
    http1_only: true

`ignore_error`

Only show warning when the site errors.

This is useful for buggy services which are sometimes just gone or for pages which will exist in the future but are not there yet. Personal example: A bad DNS configuration which lets the website appear nonexistent for some time.

This setting also skips errors from editors.

sites:
  - url: "https://edjopato.de/might-appear-in-the-future"
    ignore_error: true

`filename`

Overrides the URL based default filename of the site.

Normally the filename is automatically derived from the URL. For the following example it would be something like de-edjopato-api-token-0123456789-action-enjoy-20weather.html. With the filename options it is saved as de-edjopato-api-weather.html instead.

sites:
  - url: "https://edjopato.de/api?token=0123456789&action=enjoy%20weather"
    filename: de-edjopato-api-weather

`headers`

Add additional HTTP headers to the request to the given site.

This is useful for sites that respond differently based on different headers. Each header Key/Value pair is supplied as YAML String separated with a : followed by a space.

This is the same syntax as HTTP uses which sadly collides with YAML. YAML assumes something with a : is an object. Therefor you have to make sure to quote the headers. Using a YAML object / key/value pair is also not possible as some header keys are allowed multiple times.

sites:
  - url: "https://edjopato.de/"
    headers:
      - "Cache-Control: no-cache"
      - "User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:106.0) Gecko/20100101 Firefox/106.0"

Editors

Editors are manipulating the content of a webpage to simplify comparing them later on.

For example: If you are interested in the content of a webpage the <head> with changing style-sheets isn't interesting to you. When keeping it, it will still create diffs which end up being commits. This will create noise you're probably just going to ignore. That's why editors exist.

Think of editors like a pipeline, the next one gets the input of the one before. As some editors are assuming HTML input, they won't work (well) with non HTML input. For example its kinda useless to use html_prettify after html_textify as text won't end up being pretty HTML. For this reason editors like css_select are still producing valid HTML output.

There are probably more tasks out there that might be useful as editors. Feel free to provide an issue for an editor idea or create a Pull Request with a new editor.

`css_remove`

Tries to remove every instance of matching HTML elements and returns the remaining HTML. Opposite of css_select.

Examples:

editors:
  - css_remove: article
  - css_remove: h1 a
  - css_remove: h1 > a

`css_select`

Use CSS Selectors to grab every instance of matching HTML elements and returns all of them.

If no matching HTML elements are found, this editor errors.

Examples:

editors:
  - css_select: article
  - css_select: h1 a
  - css_select: h1 > a

`html_markdownify`

Formats the input HTML as Markdown.

Example:

editors:
  - html_markdownify

`html_prettify`

Formats the input HTML as pretty HTML.

Example:

editors:
  - html_prettify

`html_sanitize`

Strip down HTML to its minimal form.

Example:

editors:
  - html_sanitize

`html_textify`

Only returns text content of HTML elements within the input.

Example:

editors:
  - html_textify

`html_url_canonicalize`

Parses the input HTML for URLs. URLs are parsed into their canonical, absolute form.

Example:

editors:
  - html_url_canonicalize

`json_prettify`

Formats the input JSON as pretty JSON.

Example:

editors:
  - json_prettify

`regex_replace`

Searches the input with a Regex pattern and replaces all occurrences with the given replace phrase. Grouping and replacing with $1 also works.

Examples:

editors:
  # Remove all occurrences of that word
  - regex_replace:
      pattern: "tree"
      replace: ""
  # Remove all numbers
  - regex_replace:
      pattern: "\\d+"
      replace: ""
  # Find all css files and remove the extension
  - regex_replace:
      pattern: "(\\w+)\\.css"
      replace: $1

`rss`

Creates an RSS 2.0 Feed from the input. An RSS item is generated for every item_selector result. The other selectors can be used to find relevant information of the items. The content is the full result of the item_selector. It can be further edited with every available editor.

Defaults:

title: When a <title> exists, it will be used. Otherwise, it's empty.
item_selector: article
title_selector: h2
link_selector: a
content_editors can be omitted when empty

Examples:

  # Fully specified example
  - url: "https://edjopato.de/post/"
    editors:
      - rss:
          title: EdJoPaTos Blog
          item_selector: article
          title_selector: h2
          link_selector: a
          content_editors:
            - css_remove: "h2, article > a, div"
            - html_textify

  # Minimal working example
  - url: "https://edjopato.de/post/"
    editors:
      - rss: {}

Alternatives

Website Changed Bot is a Telegram Bot which might potentially use this tool later on
bernaferrari/ChangeDetection is an Android app for this
dgtlmoon/changedetection.io can be self-hosted and configured via web interface
Feed me up, Scotty! creates RSS feeds from websites
htmlq command line tool to format / select HTML (like jq for HTML)
urlwatch

Name		Name	Last commit message	Last commit date
Latest commit History 564 Commits
.github		.github
sites		sites
src		src
systemd		systemd
.dockerignore		.dockerignore
.gitignore		.gitignore
CHANGELOG.md		CHANGELOG.md
Cargo.lock		Cargo.lock
Cargo.toml		Cargo.toml
Dockerfile		Dockerfile
LICENSE		LICENSE
README.md		README.md
build.rs		build.rs

License

EdJoPaTo/website-stalker

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Website Stalker

Install

Usage

GitHub Actions

Locally

Config Example

Global Options

from

Per Site Options

url

accept_invalid_certs

http1_only

ignore_error

filename

headers

Editors

css_remove

css_select

html_markdownify

html_prettify

html_sanitize

html_textify

html_url_canonicalize

json_prettify

regex_replace

rss

Alternatives

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`from`

`url`

`accept_invalid_certs`

`http1_only`

`ignore_error`

`filename`

`headers`

`css_remove`

`css_select`

`html_markdownify`

`html_prettify`

`html_sanitize`

`html_textify`

`html_url_canonicalize`

`json_prettify`

`regex_replace`

`rss`