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defmodule Farside do
@service_prefix Application.compile_env!(:farside, :service_prefix)
@fallback_suffix Application.compile_env!(:farside, :fallback_suffix)
@previous_suffix Application.compile_env!(:farside, :previous_suffix)
# Define relation between available services and their parent service.
# This enables Farside to redirect with links such as:
# farside.link/https://www.youtube.com/watch?v=dQw4w9WgXcQ
@youtube_regex ~r/youtu(.be|be.com)|invidious|piped/
@reddit_regex ~r/reddit.com|libreddit|teddit/
@instagram_regex ~r/instagram.com|bibliogram/
@twitter_regex ~r/twitter.com|nitter/
@wikipedia_regex ~r/wikipedia.org|wikiless/
@medium_regex ~r/medium.com|scribe/
@odysee_regex ~r/odysee.com|librarian/
@imgur_regex ~r/imgur.com|rimgo/
@gtranslate_regex ~r/translate.google.com|lingva/
@tiktok_regex ~r/tiktok.com|proxitok/
@imdb_regex ~r/imdb.com|libremdb/
@quora_regex ~r/quora.com|quetre/
@gsearch_regex ~r/google.com\/search|whoogle/
@fandom_regex ~r/fandom.com|breezewiki/
@stackoverflow_regex ~r/stackoverflow.com|anonymousoverflow/
@parent_services %{
@youtube_regex => ["invidious", "piped"],
@reddit_regex => ["libreddit", "teddit"],
@instagram_regex => ["bibliogram"],
@twitter_regex => ["nitter"],
@wikipedia_regex => ["wikiless"],
@medium_regex => ["scribe"],
@odysee_regex => ["librarian"],
@imgur_regex => ["rimgo"],
@gtranslate_regex => ["lingva"],
@tiktok_regex => ["proxitok"],
@imdb_regex => ["libremdb"],
@quora_regex => ["quetre"],
@gsearch_regex => ["whoogle"],
@fandom_regex => ["breezewiki"],
@stackoverflow_regex => ["anonymousoverflow"]
}
def get_services_map do
service_list = CubDB.select(CubDB)
|> Stream.map(fn {key, _value} -> key end)
|> Stream.filter(fn key -> String.starts_with?(key, @service_prefix) end)
|> Enum.to_list
# Match service name to list of available instances
Enum.reduce(service_list, %{}, fn service, acc ->
instance_list = CubDB.get(CubDB, service)
Map.put(
acc,
String.replace_prefix(
service,
@service_prefix,
""
),
instance_list
)
end)
end
def get_service(service) do
# Check if service has an entry in the db, otherwise try to
# match against available parent services
service_name = cond do
!check_service(service) ->
Enum.find_value(
@parent_services,
fn {k, v} ->
String.match?(service, k) && Enum.random(v)
end)
true ->
service
end
service_name
end
def check_service(service) do
# Checks to see if a specific service has instances available
instances = CubDB.get(CubDB, "#{@service_prefix}#{service}")
instances != nil && Enum.count(instances) > 0
end
def last_instance(service) do
# Fetches the last selected instance for a particular service
CubDB.get(CubDB, "#{service}#{@previous_suffix}")
end
def pick_instance(service) do
instances = CubDB.get(CubDB, "#{@service_prefix}#{service}")
# Either pick a random available instance,
# or fall back to the default one
instance =
if instances != nil && Enum.count(instances) > 0 do
if Enum.count(instances) == 1 do
# If there's only one instance, just return that one...
List.first(instances)
else
# ...otherwise pick a random one from the list, ensuring
# that the same instance is never picked twice in a row.
instance =
Enum.filter(instances, &(&1 != last_instance(service)))
|> Enum.random()
CubDB.put(CubDB, "#{service}#{@previous_suffix}", instance)
instance
end
else
CubDB.get(CubDB, "#{service}#{@fallback_suffix}")
end
instance
end
def amend_instance(instance, service, path) do
cond do
String.match?(service, @instagram_regex) ->
# Bibliogram doesn't have a 1:1 matching to Instagram URLs for users,
# so a "/u" is appended if the requested path doesn't explicitly include
# "/p" for a post or an empty path for the home page.
if String.length(path) > 0 and
!String.starts_with?(path, "p/") and
!String.starts_with?(path, "u/") do
"#{instance}/u"
else
instance
end
String.match?(service, @fandom_regex) ->
# Fandom links require the subdomain to be preserved, otherwise the
# requested path won't work.
if String.contains?(service, ".fandom.com") do
wiki = String.replace(service, ".fandom.com", "")
"#{instance}/#{wiki}"
else
instance
end
true ->
instance
end
end
def get_last_updated do
CubDB.get(CubDB, "last_updated")
end
end
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