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Preserve redirect with /_/ path prefix (#13)

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This adds a straightforward way of preserving Farside's redirecting
behavior in the user's browser history. That way if an instance becomes
unavailable between the 5 min scans, the user can opt to navigate back
one page and be taken to a new instance.

This is accomplished using a single line of JS, and could potentially
work as the default behavior of Farside (with the current default
behavior requiring a path prefix instead). This should be revisited down
the road when more people are using this service.
This commit is contained in:
Ben Busby 2022-01-27 11:57:41 -07:00 • committed by GitHub
parent 724a995fd9
commit 932f3bbcab
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2
.gitignore vendored
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@ -11,3 +11,5 @@ erl_crash.dump
# Ignore results from update script
.update-result*
*.rdb

7
README.md
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@ -55,6 +55,13 @@ Farside's routing is very minimal, with only the following routes:
URL>/r/popular`
- Note that a path is not required. `/libreddit` for example will still
redirect the user to a working libreddit instance
- `/_/:service/*glob`
- Achieves the same redirect as the main `/:service/*glob` endpoint, but
preserves a short landing page in the browser's history to allow quickly
jumping between instances by navigating back.
- Ex: `/_/nitter` -> nitter instance A -> (navigate back one page) -> nitter
instance B -> ...
- *Note: Uses Javascript to preserve the page in history*
When a service is requested with the `/:service/...` endpoint, Farside requests
the list of working instances from Redis and returns a random one from the list

1
config/config.exs
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@ -9,6 +9,7 @@ config :farside,
previous_suffix: "-previous",
services_json: "services.json",
index: "index.eex",
route: "route.eex",
headers: [
{"User-Agent", "Mozilla/5.0 (Linux x86_64; rv:94.0) Gecko/20100101 Firefox/94.0"},
{"Accept", "text/html"},

14
lib/farside/router.ex
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@ -1,5 +1,6 @@
defmodule Farside.Router do
@index Application.fetch_env!(:farside, :index)
@route Application.fetch_env!(:farside, :route)
use Plug.Router
@ -24,6 +25,19 @@ defmodule Farside.Router do
send_resp(conn, 200, resp)
end
get "/_/:service/*glob" do
r_path = String.slice(conn.request_path, 2..-1)
resp =
EEx.eval_file(
@route,
service: service,
instance_url: r_path
)
send_resp(conn, 200, resp)
end
get "/:service/*glob" do
path = Enum.join(glob, "/")
instance = Farside.pick_instance(service)

10
route.eex Normal file
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@ -0,0 +1,10 @@
<head>
<title>Farside Redirect - <%= service %></title>
<meta http-equiv="refresh" content="1; url=<%= instance_url %>">
<script>
history.pushState({page: 1}, "Farside Redirect");
</script>
</head>
<body>
<span>Redirecting to <%= service %> instance...
</body>