Refactor Verification module structure (#5570)

* detector.js

* refactor: organize modules better

* Renaming (Elixir + JS)

* lib/plausible/verification -> lib/plausible/installation_support
* test/plausible/verification -> test/plausible/installation_support
* priv/tracker/verifier -> priv/tracker/installation_support
* tracker/verifier -> tracker/installation_support
* tracker/test/verifier -> tracker/test/installation-support

* rename remaining test modules

* add documentation

* dialyzer: remove module refs that do not exist yet

* Fix CI

* fix tracker CI

* fix tracker CI for good

.gitignore

@@ -92,7 +92,7 @@ plausible-report.xml
 
 # Auto-generated tracker files
 /priv/tracker/js/plausible*.js*
-/priv/tracker/verifier/*.js
+/priv/tracker/installation_support/*.js
 
 # Docker volumes
 .clickhouse_db_vol*

config/runtime.exs

@@ -937,7 +937,7 @@ config :plausible, Plausible.PromEx,
   grafana: :disabled,
   metrics_server: :disabled
 
-config :plausible, Plausible.Verification.Checks.Installation,
+config :plausible, Plausible.InstallationSupport,
   token: get_var_from_path_or_env(config_dir, "BROWSERLESS_TOKEN", "dummy_token"),
   endpoint: get_var_from_path_or_env(config_dir, "BROWSERLESS_ENDPOINT", "http://0.0.0.0:3000")
 

config/test.exs

@@ -34,14 +34,14 @@ config :plausible, Plausible.Ingestion.Counters, enabled: false
 
 config :plausible, Oban, testing: :manual
 
-config :plausible, Plausible.Verification.Checks.FetchBody,
+config :plausible, Plausible.InstallationSupport.Checks.FetchBody,
   req_opts: [
-    plug: {Req.Test, Plausible.Verification.Checks.FetchBody}
+    plug: {Req.Test, Plausible.InstallationSupport.Checks.FetchBody}
   ]
 
-config :plausible, Plausible.Verification.Checks.Installation,
+config :plausible, Plausible.InstallationSupport.Checks.Installation,
   req_opts: [
-    plug: {Req.Test, Plausible.Verification.Checks.Installation}
+    plug: {Req.Test, Plausible.InstallationSupport.Checks.Installation}
   ]
 
 config :plausible, Plausible.HelpScout,

lib/plausible/ingestion/event.ex

@@ -21,7 +21,7 @@ defmodule Plausible.Ingestion.Event do
             salts: nil,
             changeset: nil
 
-  @verification_user_agent Plausible.Verification.user_agent()
+  @verification_user_agent Plausible.InstallationSupport.user_agent()
 
   @type drop_reason() ::
           :bot

lib/plausible/installation_support/check.ex

@@ -0,0 +1,39 @@
+defmodule Plausible.InstallationSupport.Check do
+  @moduledoc """
+  Behaviour to be implemented by a specific installation support check.
+
+  `report_progress_as()` doesn't necessarily reflect the actual check
+  description, it serves as a user-facing message grouping mechanism,
+  to prevent frequent message flashing when checks rotate often.
+
+  Each check operates on `%Plausible.InstallationSupport.State{}` and is
+  expected to return it, optionally modified, by all means. `perform_safe/1`
+  is used to guarantee no exceptions are thrown by faulty implementations,
+  not to interrupt LiveView.
+  """
+  @type state() :: Plausible.InstallationSupport.State.t()
+  @callback report_progress_as() :: String.t()
+  @callback perform(state()) :: state()
+
+  defmacro __using__(_) do
+    quote do
+      import Plausible.InstallationSupport.State
+      alias Plausible.InstallationSupport.State
+
+      require Logger
+
+      @behaviour Plausible.InstallationSupport.Check
+
+      def perform_safe(state) do
+        perform(state)
+      catch
+        _, e ->
+          Logger.error(
+            "Error running check #{inspect(__MODULE__)} on #{state.url}: #{inspect(e)}"
+          )
+
+          put_diagnostics(state, service_error: e)
+      end
+    end
+  end
+end

lib/plausible/installation_support/check_runner.ex

@@ -0,0 +1,60 @@
+defmodule Plausible.InstallationSupport.CheckRunner do
+  @moduledoc """
+  Takes two arguments:
+
+  1. A `%Plausible.InstallationSupport.State{}` struct - the `diagnostics`
+     field is a struct representing the set of diagnostics shared between
+     all the checks in this flow.
+
+  2. A list of modules implementing `Plausible.InstallationSupport.Check`
+     behaviour.
+
+  Checks are normally run asynchronously, except when synchronous
+  execution is optionally required for tests. Slowdowns can be optionally
+  added, the user doesn't benefit from running the checks too quickly.
+  """
+
+  def run(state, checks, opts) do
+    async? = Keyword.get(opts, :async?, true)
+    slowdown = Keyword.get(opts, :slowdown, 500)
+
+    if async? do
+      Task.start_link(fn -> do_run(state, checks, slowdown) end)
+    else
+      do_run(state, checks, slowdown)
+    end
+  end
+
+  defp do_run(state, checks, slowdown) do
+    state =
+      Enum.reduce(
+        checks,
+        state,
+        fn check, state ->
+          state
+          |> notify_check_start(check, slowdown)
+          |> check.perform_safe()
+        end
+      )
+
+    notify_all_checks_done(state, slowdown)
+  end
+
+  defp notify_check_start(state, check, slowdown) do
+    if is_pid(state.report_to) do
+      if is_integer(slowdown) and slowdown > 0, do: :timer.sleep(slowdown)
+      send(state.report_to, {:check_start, {check, state}})
+    end
+
+    state
+  end
+
+  defp notify_all_checks_done(state, slowdown) do
+    if is_pid(state.report_to) do
+      if is_integer(slowdown) and slowdown > 0, do: :timer.sleep(slowdown)
+      send(state.report_to, {:all_checks_done, state})
+    end
+
+    state
+  end
+end

lib/plausible/installation_support/checks/csp.ex

@@ -1,9 +1,9 @@
-defmodule Plausible.Verification.Checks.CSP do
+defmodule Plausible.InstallationSupport.Checks.CSP do
   @moduledoc """
   Scans the Content Security Policy header to ensure that the Plausible domain is allowed.
-  See `Plausible.Verification.Checks` for the execution sequence.
+  See `Plausible.InstallationSupport.LegacyVerification.Checks` for the execution sequence.
   """
-  use Plausible.Verification.Check
+  use Plausible.InstallationSupport.Check
 
   @impl true
   def report_progress_as, do: "We're visiting your site to ensure that everything is working"

lib/plausible/installation_support/checks/fetch_body.ex

@@ -1,15 +1,16 @@
-defmodule Plausible.Verification.Checks.FetchBody do
+defmodule Plausible.InstallationSupport.Checks.FetchBody do
   @moduledoc """
   Fetches the body of the site and extracts the HTML document, if available, for
-  further processing.
+  further processing. See `Plausible.InstallationSupport.LegacyVerification.Checks`
-  See `Plausible.Verification.Checks` for the execution sequence.
+  for the execution sequence.
   """
-  use Plausible.Verification.Check
+  use Plausible.InstallationSupport.Check
 
   @impl true
   def report_progress_as, do: "We're visiting your site to ensure that everything is working"
 
   @impl true
+
   def perform(%State{url: "https://" <> _ = url} = state) do
     fetch_body_opts = Application.get_env(:plausible, __MODULE__)[:req_opts] || []
 

lib/plausible/installation_support/checks/installation.ex

@@ -1,12 +1,12 @@
-defmodule Plausible.Verification.Checks.Installation do
+defmodule Plausible.InstallationSupport.Checks.Installation do
   require Logger
 
-  path = Application.app_dir(:plausible, "priv/tracker/verifier/verifier-v1.js")
+  path = Application.app_dir(:plausible, "priv/tracker/installation_support/verifier-v1.js")
   # On CI, the file might not be present for static checks so we create an empty one
   File.touch!(path)
 
   @verifier_code File.read!(path)
-  @external_resource "priv/tracker/verifier/verifier-v1.js"
+  @external_resource "priv/tracker/installation_support/verifier-v1.js"
 
   # Puppeteer wrapper function that executes the vanilla JS verifier code
   @puppeteer_wrapper_code """
@@ -45,7 +45,7 @@ defmodule Plausible.Verification.Checks.Installation do
 
   - `data.callbackStatus` - integer. 202 indicates that the server acknowledged the test event.
                             The test event ingestion is discarded based on user-agent, see:
-                            `Plausible.Verification.user_agent/0`
+                            `Plausible.InstallationSupport.user_agent/0`
 
   - `data.dataDomainMismatch` - whether or not script[data-domain] mismatched with site.domain
 
@@ -63,7 +63,7 @@ defmodule Plausible.Verification.Checks.Installation do
 
   - `data.cookieBannerLikely` - whether or not there's a cookie banner blocking Plausible
   """
-  use Plausible.Verification.Check
+  use Plausible.InstallationSupport.Check
 
   @impl true
   def report_progress_as, do: "We're verifying that your visitors are being counted correctly"
@@ -77,8 +77,8 @@ defmodule Plausible.Verification.Checks.Installation do
           code: @puppeteer_wrapper_code,
           context: %{
             expectedDataDomain: data_domain,
-            url: Plausible.Verification.URL.bust_url(url),
+            url: Plausible.InstallationSupport.URL.bust_url(url),
-            userAgent: Plausible.Verification.user_agent(),
+            userAgent: Plausible.InstallationSupport.user_agent(),
             debug: Application.get_env(:plausible, :environment) == "dev"
           }
         }),
@@ -90,7 +90,7 @@ defmodule Plausible.Verification.Checks.Installation do
     extra_opts = Application.get_env(:plausible, __MODULE__)[:req_opts] || []
     opts = Keyword.merge(opts, extra_opts)
 
-    case Req.post(verification_endpoint(), opts) do
+    case Req.post(Plausible.InstallationSupport.browserless_function_api_endpoint(), opts) do
       {:ok, %{status: 200, body: %{"data" => %{"completed" => true} = js_data}}} ->
         emit_telemetry_and_log(state.diagnostics, js_data, data_domain)
 
@@ -159,11 +159,4 @@ defmodule Plausible.Verification.Checks.Installation do
 
     :telemetry.execute(telemetry_event(any_diff?), %{})
   end
-
-  defp verification_endpoint() do
-    config = Application.fetch_env!(:plausible, __MODULE__)
-    token = Keyword.fetch!(config, :token)
-    endpoint = Keyword.fetch!(config, :endpoint)
-    Path.join(endpoint, "function?token=#{token}&stealth")
-  end
 end

lib/plausible/installation_support/checks/scan_body.ex

@@ -1,8 +1,8 @@
-defmodule Plausible.Verification.Checks.ScanBody do
+defmodule Plausible.InstallationSupport.Checks.ScanBody do
   @moduledoc """
   Naive way of detecting GTM and WordPress powered sites.
   """
-  use Plausible.Verification.Check
+  use Plausible.InstallationSupport.Check
 
   @impl true
   def report_progress_as, do: "We're visiting your site to ensure that everything is working"

lib/plausible/installation_support/checks/snippet.ex

@@ -1,10 +1,10 @@
-defmodule Plausible.Verification.Checks.Snippet do
+defmodule Plausible.InstallationSupport.Checks.Snippet do
   @moduledoc """
   The check looks for Plausible snippets and tries to address the common
   integration issues, such as bad placement, data-domain typos, unknown
   attributes frequently added by performance optimization plugins, etc.
   """
-  use Plausible.Verification.Check
+  use Plausible.InstallationSupport.Check
 
   @impl true
   def report_progress_as, do: "We're looking for the Plausible snippet on your site"

lib/plausible/installation_support/checks/snippet_cache_bust.ex

@@ -1,12 +1,15 @@
-defmodule Plausible.Verification.Checks.SnippetCacheBust do
+defmodule Plausible.InstallationSupport.Checks.SnippetCacheBust do
   @moduledoc """
   A naive way of trying to figure out whether the latest site contents
   is wrapped with some CDN/caching layer.
-  In case no snippets were found, we'll try to bust the cache by appending a random query parameter
+
-  and re-run `Plausible.Verification.Checks.FetchBody` and `Plausible.Verification.Checks.Snippet` checks.
+  In case no snippets were found, we'll try to bust the cache by appending
+  a random query parameter and re-run `FetchBody` and `Snippet` checks.
   If the result is different this time, we'll assume cache likely.
   """
-  use Plausible.Verification.Check
+  use Plausible.InstallationSupport.Check
+
+  alias Plausible.InstallationSupport.{LegacyVerification, Checks, URL}
 
   @impl true
   def report_progress_as, do: "We're looking for the Plausible snippet on your site"
@@ -15,7 +18,7 @@ defmodule Plausible.Verification.Checks.SnippetCacheBust do
   def perform(
         %State{
           url: url,
-          diagnostics: %Diagnostics{
+          diagnostics: %LegacyVerification.Diagnostics{
             snippets_found_in_head: 0,
             snippets_found_in_body: 0,
             body_fetched?: true
@@ -23,10 +26,10 @@ defmodule Plausible.Verification.Checks.SnippetCacheBust do
         } = state
       ) do
     state2 =
-      %{state | url: Plausible.Verification.URL.bust_url(url)}
+      %{state | url: URL.bust_url(url)}
-      |> Plausible.Verification.Checks.FetchBody.perform()
+      |> Checks.FetchBody.perform()
-      |> Plausible.Verification.Checks.ScanBody.perform()
+      |> Checks.ScanBody.perform()
-      |> Plausible.Verification.Checks.Snippet.perform()
+      |> Checks.Snippet.perform()
 
     if state2.diagnostics.snippets_found_in_head > 0 or
          state2.diagnostics.snippets_found_in_body > 0 do

lib/plausible/installation_support/installation_support.ex

@@ -0,0 +1,32 @@
+defmodule Plausible.InstallationSupport do
+  @moduledoc """
+  This top level module is the middle ground between pre-installation
+  site scans and verification of whether Plausible has been installed
+  correctly.
+
+  Defines the user-agent used by Elixir-native HTTP requests as well
+  as headless browser checks on the client side via Browserless.
+  """
+  use Plausible
+
+  on_ee do
+    def user_agent() do
+      "Plausible Verification Agent - if abused, contact support@plausible.io"
+    end
+
+    def browserless_function_api_endpoint() do
+      config = Application.fetch_env!(:plausible, __MODULE__)
+      token = Keyword.fetch!(config, :token)
+      endpoint = Keyword.fetch!(config, :endpoint)
+      Path.join(endpoint, "function?token=#{token}&stealth")
+    end
+  else
+    def browserless_function_api_endpoint() do
+      "Browserless API should not be called on Community Edition"
+    end
+
+    def user_agent() do
+      "Plausible Community Edition"
+    end
+  end
+end

lib/plausible/installation_support/legacy_verification/checks.ex

@@ -0,0 +1,48 @@
+defmodule Plausible.InstallationSupport.LegacyVerification.Checks do
+  @moduledoc """
+  Checks that are performed during v1 site verification.
+
+  In async execution, each check notifies the caller by sending a message to it.
+  """
+  alias Plausible.InstallationSupport.LegacyVerification
+  alias Plausible.InstallationSupport.{State, CheckRunner, Checks}
+
+  require Logger
+
+  @checks [
+    Checks.FetchBody,
+    Checks.CSP,
+    Checks.ScanBody,
+    Checks.Snippet,
+    Checks.SnippetCacheBust,
+    Checks.Installation
+  ]
+
+  def run(url, data_domain, opts \\ []) do
+    checks = Keyword.get(opts, :checks, @checks)
+    report_to = Keyword.get(opts, :report_to, self())
+    async? = Keyword.get(opts, :async?, true)
+    slowdown = Keyword.get(opts, :slowdown, 500)
+
+    init_state =
+      %State{
+        url: url,
+        data_domain: data_domain,
+        report_to: report_to,
+        diagnostics: %LegacyVerification.Diagnostics{}
+      }
+
+    CheckRunner.run(init_state, checks,
+      async?: async?,
+      report_to: report_to,
+      slowdown: slowdown
+    )
+  end
+
+  def interpret_diagnostics(%State{} = state) do
+    LegacyVerification.Diagnostics.interpret(
+      state.diagnostics,
+      state.url
+    )
+  end
+end

lib/plausible/installation_support/legacy_verification/diagnostics.ex

@@ -1,10 +1,10 @@
-defmodule Plausible.Verification.Diagnostics do
+defmodule Plausible.InstallationSupport.LegacyVerification.Diagnostics do
   @moduledoc """
   Module responsible for translating diagnostics to user-friendly errors and recommendations.
   """
   require Logger
 
-  @errors Plausible.Verification.Errors.all()
+  @errors Plausible.InstallationSupport.LegacyVerification.Errors.all()
 
   defstruct plausible_installed?: false,
             snippets_found_in_head: 0,

lib/plausible/installation_support/legacy_verification/errors.ex

@@ -1,6 +1,6 @@
-defmodule Plausible.Verification.Errors do
+defmodule Plausible.InstallationSupport.LegacyVerification.Errors do
   @moduledoc """
-  A go-to definition of all verification errors
+  A go-to definition of all legacy verification errors
   """
 
   @errors %{

lib/plausible/installation_support/state.ex

@@ -1,17 +1,26 @@
-defmodule Plausible.Verification.State do
+defmodule Plausible.InstallationSupport.State do
   @moduledoc """
-  The struct and interface describing the state of the site verification process.
+  The state to be shared across check during site installation support.
-  Assigns are meant to be used to communicate between checks, while diagnostics
+
-  are later on interpreted (translated into user-friendly messages and recommendations)
+  Assigns are meant to be used to communicate between checks, while
-  via `Plausible.Verification.Diagnostics` module.
+  `diagnostics` are specific to the check group being executed.
   """
+
   defstruct url: nil,
             data_domain: nil,
             report_to: nil,
             assigns: %{},
-            diagnostics: %Plausible.Verification.Diagnostics{}
+            diagnostics: %{}
 
-  @type t() :: %__MODULE__{}
+  @type diagnostics_type :: Plausible.InstallationSupport.LegacyVerification.Diagnostics.t()
+
+  @type t :: %__MODULE__{
+          url: String.t() | nil,
+          data_domain: String.t() | nil,
+          report_to: pid() | nil,
+          assigns: map(),
+          diagnostics: diagnostics_type()
+        }
 
   def assign(%__MODULE__{} = state, assigns) do
     %{state | assigns: Map.merge(state.assigns, Enum.into(assigns, %{}))}

lib/plausible/installation_support/url.ex

@@ -1,6 +1,6 @@
-defmodule Plausible.Verification.URL do
+defmodule Plausible.InstallationSupport.URL do
   @moduledoc """
-  Busting some caches by appending ?plausible_verification=12345 to it.
+  URL utilities for installation support, including cache busting functionality.
   """
 
   def bust_url(url) do

lib/plausible/telemetry/plausible_metrics.ex

@@ -124,11 +124,13 @@ defmodule Plausible.PromEx.Plugins.PlausibleMetrics do
         ),
         counter(
           metric_prefix ++ [:verification, :js_elixir_diff],
-          event_name: Plausible.Verification.Checks.Installation.telemetry_event(_diff = true)
+          event_name:
+            Plausible.InstallationSupport.Checks.Installation.telemetry_event(_diff = true)
         ),
         counter(
           metric_prefix ++ [:verification, :js_elixir_match],
-          event_name: Plausible.Verification.Checks.Installation.telemetry_event(_diff = false)
+          event_name:
+            Plausible.InstallationSupport.Checks.Installation.telemetry_event(_diff = false)
         )
       ]
     )

lib/plausible/verification.ex

@@ -1,16 +0,0 @@
-defmodule Plausible.Verification do
-  @moduledoc """
-  Module defining the user-agent used for site verification.
-  """
-  use Plausible
-
-  on_ee do
-    def user_agent() do
-      "Plausible Verification Agent - if abused, contact support@plausible.io"
-    end
-  else
-    def user_agent() do
-      "Plausible Community Edition"
-    end
-  end
-end

lib/plausible/verification/check.ex

@@ -1,37 +0,0 @@
-defmodule Plausible.Verification.Check do
-  @moduledoc """
-  Behaviour to be implemented by specific site verification checks.
-  `report_progress_as()` doesn't necessarily reflect the actual check description,
-  it serves as a user-facing message grouping mechanism, to prevent frequent message flashing when checks rotate often.
-  Each check operates on `state()` and is expected to return it, optionally modified, by all means.
-  `perform_safe/1` is used to guarantee no exceptions are thrown by faulty implementations, not to interrupt LiveView.
-  """
-  @type state() :: Plausible.Verification.State.t()
-  @callback report_progress_as() :: String.t()
-  @callback perform(state()) :: state()
-
-  defmacro __using__(_) do
-    quote do
-      import Plausible.Verification.State
-
-      alias Plausible.Verification.Checks
-      alias Plausible.Verification.State
-      alias Plausible.Verification.Diagnostics
-
-      require Logger
-
-      @behaviour Plausible.Verification.Check
-
-      def perform_safe(state) do
-        perform(state)
-      catch
-        _, e ->
-          Logger.error(
-            "Error running check #{inspect(__MODULE__)} on #{state.url}: #{inspect(e)}"
-          )
-
-          put_diagnostics(state, service_error: e)
-      end
-    end
-  end
-end

lib/plausible/verification/checks.ex

@@ -1,75 +0,0 @@
-defmodule Plausible.Verification.Checks do
-  @moduledoc """
-  Checks that are performed during site verification.
-  Each module defined in `@checks` implements the `Plausible.Verification.Check` behaviour.
-  Checks are normally run asynchronously, except when synchronous execution is optionally required
-  for tests. Slowdowns can be optionally added, the user doesn't benefit from running the checks too quickly.
-
-  In async execution, each check notifies the caller by sending a message to it.
-  """
-  alias Plausible.Verification.Checks
-  alias Plausible.Verification.State
-
-  require Logger
-
-  @checks [
-    Checks.FetchBody,
-    Checks.CSP,
-    Checks.ScanBody,
-    Checks.Snippet,
-    Checks.SnippetCacheBust,
-    Checks.Installation
-  ]
-
-  def run(url, data_domain, opts \\ []) do
-    checks = Keyword.get(opts, :checks, @checks)
-    report_to = Keyword.get(opts, :report_to, self())
-    async? = Keyword.get(opts, :async?, true)
-    slowdown = Keyword.get(opts, :slowdown, 500)
-
-    if async? do
-      Task.start_link(fn -> do_run(url, data_domain, checks, report_to, slowdown) end)
-    else
-      do_run(url, data_domain, checks, report_to, slowdown)
-    end
-  end
-
-  def interpret_diagnostics(%State{} = state) do
-    Plausible.Verification.Diagnostics.interpret(state.diagnostics, state.url)
-  end
-
-  defp do_run(url, data_domain, checks, report_to, slowdown) do
-    init_state = %State{url: url, data_domain: data_domain, report_to: report_to}
-
-    state =
-      Enum.reduce(
-        checks,
-        init_state,
-        fn check, state ->
-          state
-          |> notify_start(check, slowdown)
-          |> check.perform_safe()
-        end
-      )
-
-    notify_verification_end(state, slowdown)
-  end
-
-  defp notify_start(state, check, slowdown) do
-    if is_pid(state.report_to) do
-      if is_integer(slowdown) and slowdown > 0, do: :timer.sleep(slowdown)
-      send(state.report_to, {:verification_check_start, {check, state}})
-    end
-
-    state
-  end
-
-  defp notify_verification_end(state, slowdown) do
-    if is_pid(state.report_to) do
-      if is_integer(slowdown) and slowdown > 0, do: :timer.sleep(slowdown)
-      send(state.report_to, {:verification_end, state})
-    end
-
-    state
-  end
-end

lib/plausible_web/live/components/verification.ex

@@ -7,6 +7,7 @@ defmodule PlausibleWeb.Live.Components.Verification do
   use Plausible
 
   alias PlausibleWeb.Router.Helpers, as: Routes
+  alias Plausible.InstallationSupport.{State, LegacyVerification}
 
   import PlausibleWeb.Components.Generic
 
@@ -19,8 +20,8 @@ defmodule PlausibleWeb.Live.Components.Verification do
   attr(:super_admin?, :boolean, default: false)
   attr(:finished?, :boolean, default: false)
   attr(:success?, :boolean, default: false)
-  attr(:verification_state, Plausible.Verification.State, default: nil)
+  attr(:verification_state, State, default: nil)
-  attr(:interpretation, Plausible.Verification.Diagnostics.Result, default: nil)
+  attr(:interpretation, LegacyVerification.Diagnostics.Result, default: nil)
   attr(:attempts, :integer, default: 0)
   attr(:flow, :string, default: "")
   attr(:installation_type, :string, default: nil)

lib/plausible_web/live/installation.ex

@@ -3,7 +3,7 @@ defmodule PlausibleWeb.Live.Installation do
   User assistance module around Plausible installation instructions/onboarding
   """
   use PlausibleWeb, :live_view
-  alias Plausible.Verification.{Checks, State}
+  alias Plausible.InstallationSupport.{State, Checks, LegacyVerification}
 
   @script_extension_params %{
     "outbound_links" => "outbound-links",
@@ -60,7 +60,7 @@ defmodule PlausibleWeb.Live.Installation do
         end)
 
       if connected?(socket) and is_nil(installation_type) do
-        Checks.run("https://#{domain}", domain,
+        LegacyVerification.Checks.run("https://#{domain}", domain,
           checks: [
             Checks.FetchBody,
             Checks.ScanBody
@@ -86,7 +86,7 @@ defmodule PlausibleWeb.Live.Installation do
     end
   end
 
-  def handle_info({:verification_end, %State{} = state}, socket) do
+  def handle_info({:all_checks_done, %State{} = state}, socket) do
     installation_type =
       case state.diagnostics do
         %{wordpress_likely?: true} -> "wordpress"

lib/plausible_web/live/installationv2.ex

@@ -3,8 +3,8 @@ defmodule PlausibleWeb.Live.InstallationV2 do
   User assistance module around Plausible installation instructions/onboarding
   """
   alias PlausibleWeb.Flows
+  alias Plausible.InstallationSupport.{State, Checks, LegacyVerification}
   use PlausibleWeb, :live_view
-  alias Plausible.Verification.{Checks, State}
 
   def mount(
         %{"domain" => domain} = params,
@@ -34,7 +34,7 @@ defmodule PlausibleWeb.Live.InstallationV2 do
       connected?(socket) and flow == Flows.provisioning() and !params["type"]
 
     if detect_installation_type? do
-      Checks.run("https://#{site.domain}", site.domain,
+      LegacyVerification.Checks.run("https://#{site.domain}", site.domain,
         checks: [
           Checks.FetchBody,
           Checks.ScanBody
@@ -62,7 +62,7 @@ defmodule PlausibleWeb.Live.InstallationV2 do
      )}
   end
 
-  def handle_info({:verification_end, %State{} = state}, socket) do
+  def handle_info({:all_checks_done, %State{} = state}, socket) do
     installation_type =
       case state.diagnostics do
         %{wordpress_likely?: true} -> "wordpress"
@@ -77,7 +77,7 @@ defmodule PlausibleWeb.Live.InstallationV2 do
      )}
   end
 
-  def handle_info({:verification_check_start, _}, socket) do
+  def handle_info({:check_start, _}, socket) do
     {:noreply, socket}
   end
 

lib/plausible_web/live/verification.ex

@@ -7,7 +7,7 @@ defmodule PlausibleWeb.Live.Verification do
   use Plausible
   use PlausibleWeb, :live_view
 
-  alias Plausible.Verification.{Checks, State}
+  alias Plausible.InstallationSupport.{State, LegacyVerification}
 
   @component PlausibleWeb.Live.Components.Verification
   @slowdown_for_frequent_checking :timer.seconds(5)
@@ -132,7 +132,7 @@ defmodule PlausibleWeb.Live.Verification do
       end
 
       {:ok, pid} =
-        Checks.run(
+        LegacyVerification.Checks.run(
           "https://#{socket.assigns.domain}",
           socket.assigns.domain,
           report_to: report_to,
@@ -143,7 +143,7 @@ defmodule PlausibleWeb.Live.Verification do
     end
   end
 
-  def handle_info({:verification_check_start, {check, _state}}, socket) do
+  def handle_info({:check_start, {check, _state}}, socket) do
     update_component(socket,
       message: check.report_progress_as()
     )
@@ -151,8 +151,8 @@ defmodule PlausibleWeb.Live.Verification do
     {:noreply, socket}
   end
 
-  def handle_info({:verification_end, %State{} = state}, socket) do
+  def handle_info({:all_checks_done, %State{} = state}, socket) do
-    interpretation = Checks.interpret_diagnostics(state)
+    interpretation = LegacyVerification.Checks.interpret_diagnostics(state)
 
     if not socket.assigns.has_pageviews? do
       schedule_pageviews_check(socket)

test/plausible/ingestion/event_test.exs

@@ -80,7 +80,7 @@ defmodule Plausible.Ingestion.EventTest do
     assert_receive :telemetry_handled
   end
 
-  test "drops verification agent" do
+  test "drops installation support user agent" do
     site = new_site()
 
     payload = %{
@@ -90,7 +90,7 @@ defmodule Plausible.Ingestion.EventTest do
 
     conn =
       build_conn(:post, "/api/events", payload)
-      |> Plug.Conn.put_req_header("user-agent", Plausible.Verification.user_agent())
+      |> Plug.Conn.put_req_header("user-agent", Plausible.InstallationSupport.user_agent())
 
     assert {:ok, request} = Request.build(conn)
 

test/plausible/installation_support/checks/csp_test.exs

@@ -1,17 +1,18 @@
-defmodule Plausible.Verification.Checks.CSPTest do
+defmodule Plausible.InstallationSupport.Checks.CSPTest do
   use Plausible.DataCase, async: true
 
-  alias Plausible.Verification.State
+  alias Plausible.InstallationSupport.{State, LegacyVerification}
 
-  @check Plausible.Verification.Checks.CSP
+  @check Plausible.InstallationSupport.Checks.CSP
+  @default_state %State{diagnostics: %LegacyVerification.Diagnostics{}}
 
   test "skips no headers" do
-    state = %State{}
+    state = @default_state
     assert ^state = @check.perform(state)
   end
 
   test "skips no headers 2" do
-    state = %State{} |> State.assign(headers: %{})
+    state = @default_state |> State.assign(headers: %{})
     assert ^state = @check.perform(state)
   end
 
@@ -19,7 +20,7 @@ defmodule Plausible.Verification.Checks.CSPTest do
     headers = %{"content-security-policy" => ["default-src 'self' foo.local; example.com"]}
 
     state =
-      %State{}
+      @default_state
       |> State.assign(headers: headers)
       |> @check.perform()
 
@@ -30,7 +31,7 @@ defmodule Plausible.Verification.Checks.CSPTest do
     headers = %{"content-security-policy" => ["default-src 'self' example.com; localhost"]}
 
     state =
-      %State{}
+      @default_state
       |> State.assign(headers: headers)
       |> @check.perform()
 

test/plausible/installation_support/checks/fetch_body_test.exs

@@ -1,9 +1,11 @@
-defmodule Plausible.Verification.Checks.FetchBodyTest do
+defmodule Plausible.InstallationSupport.Checks.FetchBodyTest do
   use Plausible.DataCase, async: true
 
   import Plug.Conn
 
-  @check Plausible.Verification.Checks.FetchBody
+  alias Plausible.InstallationSupport.{State, Checks, LegacyVerification}
+
+  @check Checks.FetchBody
 
   @normal_body """
   <html>
@@ -16,8 +18,9 @@ defmodule Plausible.Verification.Checks.FetchBodyTest do
 
   setup do
     {:ok,
-     state: %Plausible.Verification.State{
+     state: %State{
-       url: "https://example.com"
+       url: "https://example.com",
+       diagnostics: %LegacyVerification.Diagnostics{}
      }}
   end
 

test/plausible/installation_support/checks/scan_body_test.exs

@@ -1,18 +1,18 @@
-defmodule Plausible.Verification.Checks.ScanBodyTest do
+defmodule Plausible.InstallationSupport.Checks.ScanBodyTest do
   use Plausible.DataCase, async: true
 
-  alias Plausible.Verification.State
+  alias Plausible.InstallationSupport.{State, Checks, LegacyVerification}
 
-  @check Plausible.Verification.Checks.ScanBody
+  @check Checks.ScanBody
+  @default_state %State{diagnostics: %LegacyVerification.Diagnostics{}}
 
   test "skips on no raw body" do
-    state = %State{}
+    assert @default_state = @check.perform(@default_state)
-    assert ^state = @check.perform(state)
   end
 
   test "detects nothing" do
     state =
-      %State{}
+      @default_state
       |> State.assign(raw_body: "...")
       |> @check.perform()
 
@@ -22,7 +22,7 @@ defmodule Plausible.Verification.Checks.ScanBodyTest do
 
   test "detects GTM" do
     state =
-      %State{}
+      @default_state
       |> State.assign(raw_body: "...googletagmanager.com/gtm.js...")
       |> @check.perform()
 
@@ -33,7 +33,7 @@ defmodule Plausible.Verification.Checks.ScanBodyTest do
 
   test "detects GTM and cookie banner" do
     state =
-      %State{}
+      @default_state
       |> State.assign(raw_body: "...googletagmanager.com/gtm.js...cookiebot...")
       |> @check.perform()
 
@@ -45,7 +45,7 @@ defmodule Plausible.Verification.Checks.ScanBodyTest do
   for signature <- ["wp-content", "wp-includes", "wp-json"] do
     test "detects WordPress: #{signature}" do
       state =
-        %State{}
+        @default_state
         |> State.assign(raw_body: "...#{unquote(signature)}...")
         |> @check.perform()
 
@@ -57,7 +57,7 @@ defmodule Plausible.Verification.Checks.ScanBodyTest do
 
   test "detects GTM and WordPress" do
     state =
-      %State{}
+      @default_state
       |> State.assign(raw_body: "...googletagmanager.com/gtm.js....wp-content...")
       |> @check.perform()
 
@@ -72,7 +72,7 @@ defmodule Plausible.Verification.Checks.ScanBodyTest do
 
   test "detects official plugin" do
     state =
-      %State{}
+      @default_state
       |> State.assign(raw_body: @d, document: Floki.parse_document!(@d))
       |> @check.perform()
 

test/plausible/installation_support/checks/snippet_test.exs

@@ -1,12 +1,13 @@
-defmodule Plausible.Verification.Checks.SnippetTest do
+defmodule Plausible.InstallationSupport.Checks.SnippetTest do
   use Plausible.DataCase, async: true
 
-  alias Plausible.Verification.State
+  alias Plausible.InstallationSupport.{State, Checks, LegacyVerification}
 
-  @check Plausible.Verification.Checks.Snippet
+  @check Checks.Snippet
+  @default_state %State{diagnostics: %LegacyVerification.Diagnostics{}}
 
   test "skips when there's no document" do
-    state = %State{}
+    state = @default_state
     assert ^state = @check.perform(state)
   end
 
@@ -156,7 +157,7 @@ defmodule Plausible.Verification.Checks.SnippetTest do
       [data_domain: "example.com"]
       |> Keyword.merge(opts)
 
-    State
+    @default_state
     |> struct!(opts)
     |> State.assign(document: doc)
   end

test/plausible/installation_support/checks_test.exs

@@ -1,14 +1,12 @@
-defmodule Plausible.Verification.ChecksTest do
+defmodule Plausible.InstallationSupport.LegacyVerification.ChecksTest do
   use Plausible.DataCase, async: true
 
-  alias Plausible.Verification.Checks
+  alias Plausible.InstallationSupport.{State, Checks, LegacyVerification}
-  alias Plausible.Verification.Diagnostics
-  alias Plausible.Verification.State
 
   import ExUnit.CaptureLog
   import Plug.Conn
 
-  @errors Plausible.Verification.Errors.all()
+  @errors LegacyVerification.Errors.all()
 
   describe "successful verification" do
     @normal_body """
@@ -25,7 +23,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation()
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_ok()
     end
 
@@ -33,7 +31,7 @@ defmodule Plausible.Verification.ChecksTest do
       ref = :counters.new(1, [:atomics])
       test = self()
 
-      Req.Test.stub(Plausible.Verification.Checks.FetchBody, fn conn ->
+      Req.Test.stub(Checks.FetchBody, fn conn ->
         if :counters.get(ref, 1) < 2 do
           :counters.add(ref, 1, 1)
           send(test, :redirect_sent)
@@ -51,7 +49,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation()
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_ok()
 
       assert_receive :redirect_sent
@@ -76,7 +74,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation()
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_ok()
     end
 
@@ -94,7 +92,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation()
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_ok()
     end
 
@@ -107,7 +105,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(true, 202))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_ok()
     end
 
@@ -124,7 +122,7 @@ defmodule Plausible.Verification.ChecksTest do
       ref = :counters.new(1, [:atomics])
       test = self()
 
-      Req.Test.stub(Plausible.Verification.Checks.FetchBody, fn conn ->
+      Req.Test.stub(Checks.FetchBody, fn conn ->
         if :counters.get(ref, 1) == 0 do
           :counters.add(ref, 1, 1)
           send(test, :redirect_sent)
@@ -142,7 +140,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation()
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_ok()
 
       assert_receive :redirect_sent
@@ -155,7 +153,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(400, %{})
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.temporary)
     end
 
@@ -167,7 +165,7 @@ defmodule Plausible.Verification.ChecksTest do
       {_, log} =
         with_log(fn ->
           run_checks()
-          |> Checks.interpret_diagnostics()
+          |> LegacyVerification.Checks.interpret_diagnostics()
           |> assert_ok()
         end)
 
@@ -190,7 +188,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation()
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.unreachable, url: "https://example.com")
 
       assert_receive :redirect_sent
@@ -217,7 +215,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation()
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.snippet_in_body)
     end
 
@@ -242,7 +240,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation()
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.multiple_snippets)
     end
 
@@ -262,7 +260,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(false))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.no_snippet)
     end
 
@@ -283,7 +281,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation()
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_ok()
     end
 
@@ -315,7 +313,7 @@ defmodule Plausible.Verification.ChecksTest do
       end)
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.cache_general)
     end
 
@@ -357,7 +355,7 @@ defmodule Plausible.Verification.ChecksTest do
       end)
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.cache_wp_no_plugin)
     end
 
@@ -400,7 +398,7 @@ defmodule Plausible.Verification.ChecksTest do
       end)
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.cache_wp_plugin)
     end
 
@@ -409,7 +407,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(false))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.no_snippet)
     end
 
@@ -429,13 +427,13 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(false))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.no_snippet_wp)
     end
 
     test "a check that raises" do
       defmodule FaultyCheckRaise do
-        use Plausible.Verification.Check
+        use Plausible.InstallationSupport.Check
 
         @impl true
         def report_progress_as, do: "Faulty check"
@@ -450,16 +448,16 @@ defmodule Plausible.Verification.ChecksTest do
         end)
 
       assert log =~
-               ~s|Error running check Plausible.Verification.ChecksTest.FaultyCheckRaise on https://example.com: %RuntimeError{message: "boom"}|
+               ~s|Error running check Plausible.InstallationSupport.LegacyVerification.ChecksTest.FaultyCheckRaise on https://example.com: %RuntimeError{message: "boom"}|
 
       result
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.unreachable, url: "https://example.com")
     end
 
     test "a check that throws" do
       defmodule FaultyCheckThrow do
-        use Plausible.Verification.Check
+        use Plausible.InstallationSupport.Check
 
         @impl true
         def report_progress_as, do: "Faulty check"
@@ -474,10 +472,10 @@ defmodule Plausible.Verification.ChecksTest do
         end)
 
       assert log =~
-               ~s|Error running check Plausible.Verification.ChecksTest.FaultyCheckThrow on https://example.com: :boom|
+               ~s|Error running check Plausible.InstallationSupport.LegacyVerification.ChecksTest.FaultyCheckThrow on https://example.com: :boom|
 
       result
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.unreachable, url: "https://example.com")
     end
 
@@ -492,7 +490,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(false))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.csp)
     end
 
@@ -507,7 +505,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(false))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.no_snippet)
     end
 
@@ -517,13 +515,15 @@ defmodule Plausible.Verification.ChecksTest do
 
       final_state = run_checks(report_to: self())
 
-      assert_receive {:verification_check_start, {Checks.FetchBody, %State{}}}
+      assert_receive {:check_start, {Checks.FetchBody, %State{}}}
-      assert_receive {:verification_check_start, {Checks.CSP, %State{}}}
+      assert_receive {:check_start, {Checks.CSP, %State{}}}
-      assert_receive {:verification_check_start, {Checks.ScanBody, %State{}}}
+      assert_receive {:check_start, {Checks.ScanBody, %State{}}}
-      assert_receive {:verification_check_start, {Checks.Snippet, %State{}}}
+      assert_receive {:check_start, {Checks.Snippet, %State{}}}
-      assert_receive {:verification_check_start, {Checks.SnippetCacheBust, %State{}}}
+
-      assert_receive {:verification_check_start, {Checks.Installation, %State{}}}
+      assert_receive {:check_start, {Checks.SnippetCacheBust, %State{}}}
-      assert_receive {:verification_end, %State{} = ^final_state}
+
+      assert_receive {:check_start, {Checks.Installation, %State{}}}
+      assert_receive {:all_checks_done, %State{} = ^final_state}
       refute_receive _
     end
 
@@ -555,7 +555,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(false))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.csp)
     end
 
@@ -564,7 +564,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(false))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.gtm)
     end
 
@@ -591,7 +591,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(false))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.gtm_cookie_banner)
     end
 
@@ -605,7 +605,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(false))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.unreachable, url: "https://example.com")
     end
 
@@ -614,7 +614,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(true, 0))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.proxy_misconfigured)
     end
 
@@ -633,7 +633,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(false, 0))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.proxy_wp_no_plugin)
     end
 
@@ -642,13 +642,13 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(false, 0))
 
       result = run_checks()
-      interpretation = Checks.interpret_diagnostics(result)
+      interpretation = LegacyVerification.Checks.interpret_diagnostics(result)
 
       refute interpretation.ok?
       assert interpretation.errors == ["We encountered an error with your Plausible proxy"]
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.proxy_general)
     end
 
@@ -657,7 +657,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(true, 0))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.unknown)
     end
 
@@ -675,7 +675,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(false, 0))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.illegal_attrs_general)
     end
 
@@ -694,7 +694,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(false, 0))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.illegal_attrs_wp_no_plugin)
     end
 
@@ -714,7 +714,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(false, 0))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.illegal_attrs_wp_plugin)
     end
 
@@ -723,7 +723,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(true, -1))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.generic)
     end
 
@@ -732,7 +732,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(true, -1))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.old_script_wp_no_plugin)
     end
 
@@ -741,7 +741,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(true, -1))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.old_script_wp_plugin)
     end
 
@@ -750,7 +750,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation(200, plausible_installed(true, 500))
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.unknown)
     end
 
@@ -759,7 +759,7 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation()
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.different_data_domain, domain: "example.com")
     end
 
@@ -780,14 +780,14 @@ defmodule Plausible.Verification.ChecksTest do
       stub_installation()
 
       run_checks()
-      |> Checks.interpret_diagnostics()
+      |> LegacyVerification.Checks.interpret_diagnostics()
       |> assert_error(@errors.different_data_domain, domain: "example.com")
     end
   end
 
   describe "unhhandled cases from sentry" do
     test "APP-58: 4b1435e3f8a048eb949cc78fa578d1e4" do
-      %Plausible.Verification.Diagnostics{
+      %LegacyVerification.Diagnostics{
         plausible_installed?: true,
         snippets_found_in_head: 0,
         snippets_found_in_body: 0,
@@ -810,7 +810,7 @@ defmodule Plausible.Verification.ChecksTest do
     end
 
     test "service timeout" do
-      %Plausible.Verification.Diagnostics{
+      %LegacyVerification.Diagnostics{
         plausible_installed?: false,
         snippets_found_in_head: 1,
         snippets_found_in_body: 0,
@@ -833,7 +833,7 @@ defmodule Plausible.Verification.ChecksTest do
     end
 
     test "malformed snippet code, that headless somewhat accepts" do
-      %Plausible.Verification.Diagnostics{
+      %LegacyVerification.Diagnostics{
         plausible_installed?: true,
         snippets_found_in_head: 0,
         snippets_found_in_body: 0,
@@ -856,7 +856,7 @@ defmodule Plausible.Verification.ChecksTest do
     end
 
     test "gtm+wp detected, but likely script id attribute interfering" do
-      %Plausible.Verification.Diagnostics{
+      %LegacyVerification.Diagnostics{
         plausible_installed?: false,
         snippets_found_in_head: 1,
         snippets_found_in_body: 0,
@@ -881,12 +881,12 @@ defmodule Plausible.Verification.ChecksTest do
 
   defp interpret_sentry_case(diagnostics) do
     diagnostics
-    |> Diagnostics.interpret("example.com")
+    |> LegacyVerification.Diagnostics.interpret("example.com")
     |> refute_unhandled()
   end
 
   defp run_checks(extra_opts \\ []) do
-    Checks.run(
+    LegacyVerification.Checks.run(
       "https://example.com",
       "example.com",
       Keyword.merge([async?: false, report_to: nil, slowdown: 0], extra_opts)
@@ -894,11 +894,11 @@ defmodule Plausible.Verification.ChecksTest do
   end
 
   defp stub_fetch_body(f) when is_function(f, 1) do
-    Req.Test.stub(Plausible.Verification.Checks.FetchBody, f)
+    Req.Test.stub(Checks.FetchBody, f)
   end
 
   defp stub_installation(f) when is_function(f, 1) do
-    Req.Test.stub(Plausible.Verification.Checks.Installation, f)
+    Req.Test.stub(Checks.Installation, f)
   end
 
   defp stub_fetch_body(status, body) do

test/plausible_web/live/components/verification_test.exs

@@ -3,6 +3,8 @@ defmodule PlausibleWeb.Live.Components.VerificationTest do
   import Phoenix.LiveViewTest, only: [render_component: 2]
   import Plausible.Test.Support.HTML
 
+  alias Plausible.InstallationSupport.{State, LegacyVerification}
+
   @component PlausibleWeb.Live.Components.Verification
   @progress ~s|#progress-indicator p#progress|
 
@@ -36,8 +38,9 @@ defmodule PlausibleWeb.Live.Components.VerificationTest do
 
   test "renders diagnostic interpretation" do
     interpretation =
-      Plausible.Verification.Checks.interpret_diagnostics(%Plausible.Verification.State{
+      LegacyVerification.Checks.interpret_diagnostics(%State{
-        url: "example.com"
+        url: "example.com",
+        diagnostics: %LegacyVerification.Diagnostics{}
       })
 
     html =
@@ -58,12 +61,13 @@ defmodule PlausibleWeb.Live.Components.VerificationTest do
   end
 
   test "renders super-admin report" do
-    state = %Plausible.Verification.State{
+    state = %State{
-      url: "example.com"
+      url: "example.com",
+      diagnostics: %LegacyVerification.Diagnostics{}
     }
 
     interpretation =
-      Plausible.Verification.Checks.interpret_diagnostics(state)
+      LegacyVerification.Checks.interpret_diagnostics(state)
 
     html =
       render_component(@component,

test/plausible_web/live/installation_test.exs

@@ -355,7 +355,7 @@ defmodule PlausibleWeb.Live.InstallationTest do
   end
 
   defp stub_fetch_body(f) when is_function(f, 1) do
-    Req.Test.stub(Plausible.Verification.Checks.FetchBody, f)
+    Req.Test.stub(Plausible.InstallationSupport.Checks.FetchBody, f)
   end
 
   defp stub_fetch_body(status, body) do

test/plausible_web/live/installationv2_test.exs

@@ -279,7 +279,7 @@ defmodule PlausibleWeb.Live.InstallationV2Test do
   end
 
   defp stub_fetch_body(f) when is_function(f, 1) do
-    Req.Test.stub(Plausible.Verification.Checks.FetchBody, f)
+    Req.Test.stub(Plausible.InstallationSupport.Checks.FetchBody, f)
   end
 
   defp stub_fetch_body(status, body) do

test/plausible_web/live/verification_test.exs

@@ -184,11 +184,11 @@ defmodule PlausibleWeb.Live.VerificationTest do
   end
 
   defp stub_fetch_body(f) when is_function(f, 1) do
-    Req.Test.stub(Plausible.Verification.Checks.FetchBody, f)
+    Req.Test.stub(Plausible.InstallationSupport.Checks.FetchBody, f)
   end
 
   defp stub_installation(f) when is_function(f, 1) do
-    Req.Test.stub(Plausible.Verification.Checks.Installation, f)
+    Req.Test.stub(Plausible.InstallationSupport.Checks.Installation, f)
   end
 
   defp stub_fetch_body(status, body) do

tracker/ARCHITECTURE.md

@@ -3,6 +3,16 @@
 This document describes the design goals informing the architecture of the Plausible tracker script codebase as well as a map
 to how the code is laid out.
 
+## Installation Support
+
+The tracker subdirectory also includes site verification and pre-installation checks that are run in headless browser, via
+browserless.io. These files live under the `/tracker/installation-support/` director and are meant to provide Plausible
+installation support - checking the site for what technologies to recommend and verifying whether Plausible has been
+installed correctly. Please see `lib/plausible/installation_support/checks/installation.ex` for the Elixir context and how
+this JS code ends up being used.
+
+While this logic could be separated from the tracker script, it's convenient for installation support to reuse the Playwright test structure and JS compilation logic without introducing yet another subdirectory with its own dependencies.
+
 ## Design goals
 
 We want to provide users a javascript suite to capture page views and activities done on the web page.

tracker/compiler/variants.json

@@ -31,10 +31,16 @@
       },
       "npm_package": "esm"
     },
+    {
+      "name": "detector.js",
+      "entry_point": "installation_support/detector.js",
+      "output_path": "priv/tracker/installation_support/detector.js",
+      "globals": {}
+    },
     {
       "name": "verifier-v1.js",
-      "entry_point": "verifier/verifier-v1.js",
+      "entry_point": "installation_support/verifier-v1.js",
-      "output_path": "priv/tracker/verifier/verifier-v1.js",
+      "output_path": "priv/tracker/installation_support/verifier-v1.js",
       "globals": {}
     }
   ],

tracker/installation_support/detector.js

@@ -0,0 +1,35 @@
+import { waitForSnippetsV1 } from "./snippet-checks"
+import { checkWordPress } from "./check-wordpress"
+import { checkGTM } from "./check-gtm"
+
+window.scanPageBeforePlausibleInstallation = async function(detectV1, debug) {
+  function log(message) {
+    if (debug) console.log('[Plausible Verification]', message)
+  }
+
+  const {wordpressPlugin, wordpressLikely} = checkWordPress(document)
+  log(`wordpressPlugin: ${wordpressPlugin}`)
+  log(`wordpressLikely: ${wordpressLikely}`)
+
+  const gtmLikely = checkGTM(document)
+  log(`gtmLikely: ${gtmLikely}`)
+
+  // Cannot implement yet: we should detect the WP plugin version here and
+  // decide `v1Detected` based on that. For now we assume WP plugin is v1.
+  let v1Detected = wordpressPlugin
+
+  if (!v1Detected && detectV1) {
+    const snippetData = await waitForSnippetsV1(log)
+    v1Detected = snippetData.counts.all > 0
+  }
+
+  return {
+    data: {
+      completed: true,
+      v1Detected: v1Detected,
+      wordpressPlugin: wordpressPlugin,
+      wordpressLikely: wordpressLikely,
+      gtmLikely: gtmLikely,
+    }
+  }
+}

tracker/playwright.config.js

@@ -15,7 +15,11 @@ export default defineConfig({
   retries: process.env.CI ? 1 : 0,
   /* Reporter to use. See https://playwright.dev/docs/test-reporters */
   reporter: 'list',
-  /* Shared settings for all the projects below. See https://playwright.dev/docs/api/class-testoptions. */
+  /*
+  Shared settings for all the projects below. See https://playwright.dev/docs/api/class-testoptions.
+  NOTE: We run the installation support tests on Chrome only because the Browserless /function API
+  runs a Chromium-based browser environment.
+  */
   projects: [
     {
       name: 'chromium',
@@ -25,13 +29,13 @@ export default defineConfig({
     {
       name: 'firefox',
       use: { ...devices['Desktop Firefox'] },
-      testIgnore: 'test/verifier/**',
+      testIgnore: 'test/installation_support/**',
     },
 
     {
       name: 'webkit',
       use: { ...devices['Desktop Safari'] },
-      testIgnore: 'test/verifier/**',
+      testIgnore: 'test/installation_support/**',
     },
   ],
   webServer: {

tracker/test/installation_support/check-data-domain-mismatch.spec.js

@@ -1,5 +1,5 @@
 import { test, expect } from '@playwright/test'
-import { checkDataDomainMismatch } from '../../verifier/check-data-domain-mismatch'
+import { checkDataDomainMismatch } from '../../installation_support/check-data-domain-mismatch'
 
 function mockSnippet(dataDomain) {
   return { getAttribute: _ => dataDomain }

tracker/test/installation_support/check-gtm.spec.js

@@ -1,5 +1,5 @@
 import { test, expect } from '@playwright/test'
-import { checkGTM } from '../../verifier/check-gtm'
+import { checkGTM } from '../../installation_support/check-gtm'
 
 function mockDocument(html) {
   return {

tracker/test/installation_support/check-manual-extension.spec.js

@@ -1,5 +1,5 @@
 import { test, expect } from '@playwright/test'
-import { checkManualExtension } from '../../verifier/check-manual-extension'
+import { checkManualExtension } from '../../installation_support/check-manual-extension'
 
 function mockSnippet(dataDomain) {
   return { getAttribute: _ => dataDomain }

tracker/test/installation_support/check-proxy-likely.spec.js

@@ -1,5 +1,5 @@
 import { test, expect } from '@playwright/test'
-import { checkProxyLikely } from '../../verifier/check-proxy-likely'
+import { checkProxyLikely } from '../../installation_support/check-proxy-likely'
 
 function mockSnippet(src) {
   return { getAttribute: _ => src }

tracker/test/installation_support/check-unknown-attributes.test.js

@@ -1,5 +1,5 @@
 import { test, expect } from '@playwright/test'
-import { checkUnknownAttributes } from '../../verifier/check-unknown-attributes.js'
+import { checkUnknownAttributes } from '../../installation_support/check-unknown-attributes.js'
 
 test.describe('checkUnknownAttributes', () => {
   test('returns false when no snippets', () => {

tracker/test/installation_support/check-wp.spec.js

@@ -1,5 +1,5 @@
 import { test, expect } from '@playwright/test'
-import { checkWordPress, WORDPRESS_PLUGIN_VERSION_SELECTOR } from '../../verifier/check-wordpress'
+import { checkWordPress, WORDPRESS_PLUGIN_VERSION_SELECTOR } from '../../installation_support/check-wordpress'
 
 function mockDocument(html, hasMetaTag) {
   return {

tracker/test/installation_support/detector.spec.js

@@ -0,0 +1,56 @@
+import { test, expect } from '@playwright/test'
+import { detect } from '../support/installation-support-playwright-wrappers'
+import { initializePageDynamically } from '../support/initialize-page-dynamically'
+
+test.describe('detector.js (basic diagnostics)', () => {
+  test('skips v1 snippet detection by default', async ({ page }, { testId }) => {
+    const { url } = await initializePageDynamically(page, {
+      testId,
+      response: `
+        <html>
+          <head>
+            <script src="" data-domain=""></script>
+          </head>
+        </html>
+      `
+    })
+
+    const result = await detect(page, {url: url, detectV1: false})
+
+    expect(result.data.v1Detected).toBe(false)
+  })
+
+  test('detects WP plugin, WP and GTM', async ({ page }, { testId }) => {
+    const { url } = await initializePageDynamically(page, {
+      testId,
+      response: `
+        <html>
+          <head>
+            <link rel="icon" href="https://example.com/wp-content/uploads/favicon.ico" sizes="32x32">
+            <meta name="plausible-analytics-version" content="2.3.1">
+            <script async src="https://www.googletagmanager.com/gtm.js?id=GTM-123"></script>
+          </head>
+        </html>
+      `
+    })
+
+    const result = await detect(page, {url: url, detectV1: false})
+
+    expect(result.data.wordpressPlugin).toBe(true)
+    expect(result.data.wordpressLikely).toBe(true)
+    expect(result.data.gtmLikely).toBe(true)
+  })
+
+  test('No WP plugin, WP or GTM', async ({ page }, { testId }) => {
+    const { url } = await initializePageDynamically(page, {
+      testId,
+      response: '<html><head></head></html>'
+    })
+
+    const result = await detect(page, {url: url, detectV1: false})
+
+    expect(result.data.wordpressPlugin).toBe(false)
+    expect(result.data.wordpressLikely).toBe(false)
+    expect(result.data.gtmLikely).toBe(false)
+  })
+})

tracker/test/installation_support/verifier-v1.spec.js

@@ -1,5 +1,5 @@
 import { test, expect } from '@playwright/test'
-import verify from '../support/verify-playwright-wrapper'
+import { verify } from '../support/installation-support-playwright-wrappers'
 import { delay } from '../support/test-utils'
 import { initializePageDynamically } from '../support/initialize-page-dynamically'
 import { compileFile } from '../../compiler'

tracker/test/support/installation-support-playwright-wrappers.js

@@ -0,0 +1,33 @@
+import { compileFile } from '../../compiler/index.js'
+import variantsFile from '../../compiler/variants.json' with { type: 'json' }
+
+const VERIFIER_V1_JS_VARIANT = variantsFile.manualVariants.find(variant => variant.name === 'verifier-v1.js')
+const DETECTOR_JS_VARIANT = variantsFile.manualVariants.find(variant => variant.name === 'detector.js')
+
+export async function verify(page, context) {
+  const {url, expectedDataDomain} = context
+  const debug = context.debug ? true : false
+
+  const verifierCode = await compileFile(VERIFIER_V1_JS_VARIANT, { returnCode: true })
+
+  await page.goto(url)
+  await page.evaluate(verifierCode)
+
+  return await page.evaluate(async ({expectedDataDomain, debug}) => {
+    return await window.verifyPlausibleInstallation(expectedDataDomain, debug)
+  }, {expectedDataDomain, debug})
+}
+
+export async function detect(page, context) {
+  const {url, detectV1} = context
+  const debug = context.debug ? true : false
+
+  const detectorCode = await compileFile(DETECTOR_JS_VARIANT, { returnCode: true })
+
+  await page.goto(url)
+  await page.evaluate(detectorCode)
+
+  return await page.evaluate(async ({detectV1, debug}) => {
+    return await window.scanPageBeforePlausibleInstallation(detectV1, debug)
+  }, {detectV1, debug})
+}

tracker/test/support/verify-playwright-wrapper.js

@@ -1,18 +0,0 @@
-import { compileFile } from '../../compiler/index.js'
-import variantsFile from '../../compiler/variants.json' with { type: 'json' }
-
-const VARIANT = variantsFile.manualVariants.find(variant => variant.name === 'verifier-v1.js')
-
-export default async function verify(page, context) {
-  const {url, expectedDataDomain} = context
-  const debug = context.debug ? true : false
-
-  const verifierCode = await compileFile(VARIANT, { returnCode: true })
-
-  await page.goto(url)
-  await page.evaluate(verifierCode)
-
-  return await page.evaluate(async ({expectedDataDomain, debug}) => {
-    return await window.verifyPlausibleInstallation(expectedDataDomain, debug)
-  }, {expectedDataDomain, debug})
-}