Add plug for source favicons

assets/js/dashboard/stats/sources/source-list.js

@@ -59,7 +59,7 @@ class AllSources extends React.Component {
               to={{search: query.toString()}}
             >
               <img
-                src={`https://icons.duckduckgo.com/ip3/${referrer.url}.ico`}
+                src={`/favicon/sources/${referrer.name}`}
                 referrerPolicy="no-referrer"
                 className="inline w-4 h-4 mr-2 -mt-px align-middle"
               />
@@ -172,7 +172,7 @@ class UTMSources extends React.Component {
           maxWidthDeduction="4rem"
         >
           <span className="flex px-2 py-1.5 dark:text-gray-300 relative z-9 break-words">
-            <Link 
+            <Link
               className="block hover:underline"
               to={{search: query.toString()}}
             >

lib/mix/tasks/generate_referrer_favicons.ex

@@ -0,0 +1,29 @@
+defmodule Mix.Tasks.GenerateReferrerFavicons do
+  use Mix.Task
+  use Plausible.Repo
+  require Logger
+
+  # coveralls-ignore-start
+
+  def run(_) do
+    entries =
+      :yamerl_constr.file(Application.app_dir(:plausible, "priv/ref_inspector/referers.yml"))
+      |> List.first()
+      |> Enum.map(fn {_key, val} -> val end)
+      |> Enum.concat()
+
+    domains =
+      Enum.reduce(entries, %{}, fn {key, val}, domains ->
+        domain =
+          Enum.into(val, %{})['domains']
+          |> List.first()
+
+        Map.put_new(domains, List.to_string(key), List.to_string(domain))
+      end)
+
+    File.write!(
+      Application.app_dir(:plausible, "priv/referer_favicon_domains.json"),
+      Jason.encode!(domains)
+    )
+  end
+end

lib/plausible_web/endpoint.ex

@@ -7,6 +7,7 @@ defmodule PlausibleWeb.Endpoint do
   # You should set gzip to true if you are running phx.digest
   # when deploying your static files in production.
   plug PlausibleWeb.Tracker
+  plug PlausibleWeb.Favicon
 
   plug Plug.Static,
     at: "/",

lib/plausible_web/plugs/favicon.ex

@@ -0,0 +1,37 @@
+defmodule PlausibleWeb.Favicon do
+  import Plug.Conn
+
+  def init(_) do
+    domains =
+      case File.read(Application.app_dir(:plausible, "priv/referer_favicon_domains.json")) do
+        {:ok, contents} ->
+          Jason.decode!(contents)
+
+        _ ->
+          %{}
+      end
+
+    [favicon_domains: domains]
+  end
+
+  def call(conn, favicon_domains: favicon_domains) do
+    case conn.path_info do
+      ["favicon", "sources", source] ->
+        clean_source = URI.decode_www_form(source)
+        domain = Map.get(favicon_domains, clean_source, clean_source)
+        res = HTTPoison.get!("https://icons.duckduckgo.com/ip3/#{domain}.ico")
+
+        conn =
+          Enum.filter(res.headers, fn {key, _val} -> key != "Transfer-Encoding" end)
+          |> Enum.reduce(conn, fn {key, val}, conn ->
+            put_resp_header(conn, key, val)
+          end)
+
+        send_resp(conn, 200, res.body)
+        |> halt
+
+      _ ->
+        conn
+    end
+  end
+end