A redirecting service for FOSS alternative frontends.

Farside provides links that automatically redirect to working instances of privacy-oriented alternative frontends, such as Nitter, Libreddit, etc. This allows for users to have more reliable access to the available public instances for a particular service, while also helping to distribute traffic more evenly across all instances and avoid performance bottlenecks and rate-limiting.

Demo

Farside's links work with the following structure: farside.link/<service>/<path>

For example:

Service	Page	Farside Link
Libreddit	/r/popular	https://farside.link/libreddit/r/popular
Teddit	/r/popular	https://farside.link/teddit/r/popular
Nitter	User Profile	https://farside.link/nitter/josevalim
Invidious	Home Page	https://farside.link/invidious
Piped	Video Page	https://farside.link/piped/watch?v=eBGIQ7ZuuiU
Bibliogram	User Profile	https://farside.link/bibliogram/u/kbdfans
Whoogle	Search "Elixir"	https://farside.link/whoogle/search?q=elixir&lang_interface=en
Searx	Search "Redis"	https://farside.link/searx/search?q=redis
SimplyTranslate	Translate "hola"	https://farside.link/simplytranslate/?engine=google&text=hola
Lingva	Translate "bonjour"	https://farside.link/lingva/auto/en/bonjour
Rimgo	View photo album	https://farside.link/rimgo/a/H8M4rcp

How It Works

The app runs with an internally scheduled cron task that queries all instances for services defined in services.json every 5 minutes. For each instance, as long as the instance takes <5 seconds to respond and returns a successful response code, the instance is added to a list of available instances for that particular service. If not, it is discarded until the next update period.

Farside's routing is very minimal, with only the following routes:

• /
  • The app home page, displaying all live instances for every service
• /ping
  • A passthrough "ping" to redis to ensure both app and redis are working
• /:service/*glob
  • The main endpoint for redirecting a user to a working instance of a particular service with the specified path
  • Ex: /libreddit/r/popular would navigate to <libreddit instance 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 and adds that instance as a new entry in Redis to remove from subsequent requests for that service. For example:

A user navigates to /nitter and is redirected to nitter.net. The next user to request /nitter will be guaranteed to not be directed to nitter.net, and will instead be redirected to a separate (random) working instance. That instance will now take the place of nitter.net as the "reserved" instance, and nitter.net will be returned to the list of available Nitter instances.

This "reserving" of previously chosen instances is performed in an attempt to ensure better distribution of traffic to available instances for each service.

Farside also has built-in IP ratelimiting for all requests, enforcing only one request per second per IP.

Development

• Install redis
• Install elixir
• Start redis: redis-server /usr/local/etc/redis.conf
• Install dependencies: mix deps.get
• Initialize redis contents: mix run -e Farside.Instances.sync
• Run Farside: mix run --no-halt
  • Uses localhost:4001

Environment Variables

Name	Purpose
FARSIDE_TEST	If enabled, bypasses the instance availability check and adds all instances to the pool.