git-annex/doc/design/assistant/webapp.mdwn

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The webapp is a web server that displays a shiny interface.
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## performance
Having the webapp open while transfers are
running uses significant CPU just for the browser to update the progress
bar. Unsurprising, since the webapp is sending the browser a new `<div>`
each time. Updating the DOM instead from javascript would avoid that;
the webapp just needs to send the javascript either a full `<div>` or a
changed percentage and quantity complete to update a single progress bar.
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## other features
* there could be a UI to export a file, which would make it be served up
over http by the web app
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* there could be a UI (some javascript thing) in the web browser to
submit urls to the web app to be added to the annex and downloaded.
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See: [[todo/wishlist:_an_"assistant"_for_web-browsing_--_tracking_the_sources_of_the_downloads]]
* Display the `inotify max_user_watches` exceeded message. **done**
* Display something sane when kqueue runs out of file descriptors.
* allow removing git remotes **done**
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* allow disabling syncing to here, which should temporarily disable all
local syncing. **done**
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## first start **done**
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* make git repo **done**
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* generate a nice description like "joey@hostname Desktop/annex" **done**
* record repository that was made, and use it next time run **done**
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* write a pid file, to prevent more than one first-start process running
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at once **done**
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## security **acceptable/done**
* Listen only to localhost. **done**
* Instruct the user's web browser to open an url that contains a secret
token. This guards against other users on the same system. **done**
(I would like to avoid passwords or other authentication methods,
it's your local system.)
* Don't pass the url with secret token directly to the web browser,
as that exposes it to `ps`. Instead, write a html file only the user can read,
that redirects to the webapp. **done**
* Alternative for Linux at least would be to write a small program using
GTK+ Webkit, that runs the webapp, and can know what user ran it, avoiding
needing authentication.