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88211d3 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | defmodule PlausibleWeb.TrackerPlug do
@moduledoc """
Plug to serve the Plausible tracker script.
"""
import Plug.Conn
use Agent
use Plausible
base_variants = [
"hash",
"outbound-links",
"exclusions",
"compat",
"local",
"manual",
"file-downloads",
"pageview-props",
"tagged-events",
"revenue",
"pageleave"
]
# Generates Power Set of all variants
legacy_variants =
1..Enum.count(base_variants)
|> Enum.map(fn x ->
Combination.combine(base_variants, x)
|> Enum.map(fn y -> Enum.sort(y) |> Enum.join(".") end)
end)
|> List.flatten()
@base_legacy_filenames ["plausible", "script", "analytics"]
@files_available ["plausible.js", "p.js"] ++
Enum.map(legacy_variants, fn v -> "plausible.#{v}.js" end)
def init(opts) do
Keyword.merge(opts, files_available: MapSet.new(@files_available))
end
def call(conn, files_available: files_available) do
case conn.request_path do
"/js/pa-" <> path ->
if String.ends_with?(path, ".js") do
id = String.replace_trailing(path, ".js", "")
request_tracker_script("pa-" <> id, conn)
else
conn
end
"/js/p.js" ->
legacy_request_file("p.js", files_available, conn)
"/js/" <> requested_filename ->
sorted_script_variant(requested_filename) |> legacy_request_file(files_available, conn)
_ ->
conn
end
end
def telemetry_event(name), do: [:plausible, :tracker_script, :request, name]
defp request_tracker_script(id, conn) do
case PlausibleWeb.Tracker.get_plausible_main_script(id) do
script_tag when is_binary(script_tag) ->
:telemetry.execute(
telemetry_event(:v2),
%{},
%{status: 200}
)
conn
|> put_resp_header("content-type", "application/javascript")
|> put_resp_header("x-content-type-options", "nosniff")
|> put_resp_header("cross-origin-resource-policy", "cross-origin")
|> put_resp_header("access-control-allow-origin", "*")
|> put_resp_header("cache-control", "public, max-age=60, no-transform")
# CDN-Tag is used by BunnyCDN to tag cached resources. This allows us to purge
# specific tracker scripts from the CDN cache.
|> put_resp_header("cdn-tag", "tracker_script::#{id}")
|> send_resp(200, script_tag)
|> halt()
nil ->
:telemetry.execute(
telemetry_event(:v2),
%{},
%{status: 404}
)
conn
|> send_resp(404, "Not found")
|> halt()
end
end
defp legacy_request_file(filename, files_available, conn) do
if filename && MapSet.member?(files_available, filename) do
location = Application.app_dir(:plausible, "priv/tracker/js/" <> filename)
:telemetry.execute(
telemetry_event(:legacy),
%{},
%{status: 200}
)
conn
|> put_resp_header("content-type", "application/javascript")
|> put_resp_header("x-content-type-options", "nosniff")
|> put_resp_header("cross-origin-resource-policy", "cross-origin")
|> put_resp_header("access-control-allow-origin", "*")
|> put_resp_header("cache-control", "public, max-age=86400, must-revalidate")
|> send_file(200, location)
|> halt()
else
conn
end
end
# Variants which do not factor into output
@ignore_variants ["js", "pageleave"]
defp sorted_script_variant(requested_filename) do
case String.split(requested_filename, ".") do
[base_filename | rest] when base_filename in @base_legacy_filenames ->
sorted_variants =
rest
|> Enum.reject(&(&1 in @ignore_variants))
|> Enum.sort()
Enum.join(["plausible"] ++ sorted_variants ++ ["js"], ".")
_ ->
nil
end
end
end
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