Support authenticated sites

[James Blair]

webshot() should support screenshots of authenticated sites. A potential workflow could follow the pattern of token_fetch() from the gargle package:

1. webshot("auth.website.url") detects that there’s an authentication layer in place (not sure if this is possible, but most auth sites will redirect to a login page if credentials are missing, so maybe check for that re-direct)
2. Offers to cache cookies
3. Opens a browser for the user to perform sign-in
4. Captures and optionally caches cookies
5. Continues on with capturing the screenshot

It may also be helpful to provide a cookies argument to webshot() so that authenticated sites can be accessed programmatically.

[Maëlle Salmon]

I miss the eval argument that webshot::webshot() has (and that I used to authenticate).

[Winston Chang]

@maelle Can you file a new issue about eval?

[Vincent Nijs]

Is there a way to use webshot with pages that require authentication now?

[Maëlle Salmon]

Just noting that you can do screenshots with chromote https://github.com/rstudio/chromote whose interface lets you perform actions on the page more easily.

[Vincent Nijs]

Thanks @maelle. I had not heard about chromote. Great tool.