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Credo, add some inline comments

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This commit is contained in:
Mark Felder 2021-01-26 13:50:25 -06:00
parent f44e11c7ab
commit a55c6de32b
1 changed files with 18 additions and 2 deletions
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18
lib/pleroma/web/activity_pub/mrf/dns_rbl_policy.ex
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@ -10,8 +10,14 @@ defmodule Pleroma.Web.ActivityPub.MRF.DnsRblPolicy do
defp check_rbl(%{host: actor_host} = _actor_info, object) do
rblconfig = Config.get([:mrf_dnsrbl])
# :nameserver is the RBL server we want to query
rblhost = rblconfig[:nameserver]
# We have to query the nameserver's by IP, so look it up if an IP address wasn't
# provided in the config.
# You may want this to be a hostname with round-robin A records for basic load
# balancing, so we try that.
{:ok, rblnsip} =
case rblhost |> String.to_charlist() |> :inet_parse.address() do
{:ok, _} -> rblhost |> String.to_charlist() |> :inet_parse.address()
@ -20,10 +26,20 @@ defmodule Pleroma.Web.ActivityPub.MRF.DnsRblPolicy do
rblport = rblconfig[:port]
# If the provided nameserver was an IP, we also need to know the zone because we can't
# derive it from the hostname. If the DNSRBL server software is configured to use "bl.pleroma.com"
# -- irrespective of the actual hostname/IP used to reach it -- we need to know this as all queries
# are nested under the zone. e.g., if you're checking the status of pleroma.host you are querying for:
# dig @nameserverip pleroma.host.bl.pleroma.com. in A
rblzone = rblconfig[:zone] || rblhost
query = (actor_host <> "." <> rblzone) |> String.to_charlist()
# concatenate the host we're checking with the zone, e.g., "pleroma.host" <> . <> "bl.pleroma.com" <> .
query = (actor_host <> "." <> rblzone <> ".") |> String.to_charlist()
# Timeout of 1s, retry 1
# We will only be using UDP for queries, so I think if the DNSRBL server is > 500ms away it won't work
# with these values, but you also wouldn't want it to be so far away or it will slow things down.
# I think we should probably try to cache entries in cachex too, maybe 300s TTL ?
rbl_response =
:inet_res.lookup(query, :in, :a, nameservers: [{rblnsip, rblport}], timeout: 1000, retry: 1)