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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more
Current section
Files
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Current section
Files
lib/modules/storage/audit.ex
defmodule PhoenixKit.Modules.Storage.Audit do
@moduledoc """
The "who changed what" half of Media's history
(`dev_docs/plans/2026-10-03-job-runs.md`, §7): every change to the site's storage
*configuration* is written to the Activity log, and the action names live here, in
one place. Settings → Media → **History** reads them back, together with the
entries of the storage job runs.
| action | resource |
|---|---|
| `storage.profile.created` / `updated` / `deleted` | `storage_profile` |
| `storage.profile.bucket_added` / `bucket_changed` / `bucket_removed` | `storage_profile` |
| `storage.library.created` / `renamed` / `deleted` | `storage_library` |
| `storage.library.profile_changed` / `variant_set_changed` / `setting_changed` | `storage_library` |
| `storage.variant_set.created` / `updated` / `deleted` / `remade` | `storage_variant_set` |
| `storage.variant_set.size_created` / `size_updated` / `size_deleted` / `sizes_reset` | `storage_variant_set` |
| `storage.bucket.created` / `updated` / `deleted` | `storage_bucket` |
An entry carries the acting user (`actor_uuid:` in the context's options; the
LiveViews pass `PhoenixKitWeb.Actor.opts(socket)`), a mode (`manual` when a person
acted, `auto` when nothing did) and, for a change, the Activity log's own
`"changes"` shape — `%{"copies_originals" => %{"from" => 1, "to" => 2}}` — which the
feed already renders as "from → to". Entries are **permanent**: they are not pruned
by `activity_retention_days`, because "who changed this bucket last year" is exactly
what an audit is asked.
Only the **site's** configuration is recorded. A user's own library, profile and
bucket (V203–V206) are theirs and private; their changes are not written here. And
nothing secret is ever put in an entry: bucket changes name only the fields in
`bucket_fields/0`, never a key or a secret.
"""
import Ecto.Query
require Logger
alias PhoenixKit.Activity
alias PhoenixKit.Modules.Storage.Endpoint
@module_key "storage"
@bucket_fields ~w(name provider region endpoint bucket_name enabled priority integration_uuid cdn_url access_type max_size_mb)a
@entries_key {__MODULE__, :entries}
@callbacks_key {__MODULE__, :callbacks}
@external_key {__MODULE__, :external_transaction}
@doc "The Activity module key every storage entry (configuration and runs) is filed under."
@spec module_key() :: String.t()
def module_key, do: @module_key
@doc "The bucket fields whose changes are recorded: never a key or a secret."
@spec bucket_fields() :: [atom()]
def bucket_fields, do: @bucket_fields
@doc """
Runs a configuration mutation and its audit inserts in one transaction, then
announces the entries after commit. Nested audited mutations share the entries.
A failed mutation or audit insert rolls everything back.
Inside a caller's own repo transaction, entries commit with that transaction
but are not announced: this module cannot know when the caller commits. The
History tab's periodic refresh picks them up. Call this wrapper at the outer
boundary when immediate announcements are wanted.
"""
@spec transaction((-> result)) :: result | {:error, term()} when result: var
def transaction(fun) do
if Process.get(@entries_key), do: fun.(), else: transact(fun)
end
defp transact(fun) do
nested? = repo().in_transaction?()
result =
repo().transaction(fn ->
Process.put(@entries_key, [])
Process.put(@callbacks_key, [])
Process.put(@external_key, nested?)
try do
case fun.() do
{:error, reason} ->
repo().rollback(reason)
value ->
{value, Enum.reverse(Process.get(@entries_key)),
Enum.reverse(Process.get(@callbacks_key))}
end
after
Process.delete(@entries_key)
Process.delete(@callbacks_key)
Process.delete(@external_key)
end
end)
case result do
{:ok, {value, entries, callbacks}} ->
Enum.each(callbacks, &run_callback/1)
unless nested?, do: Enum.each(entries, &Activity.broadcast/1)
value
{:error, reason} ->
{:error, reason}
end
end
@doc """
Defers a cache invalidation or compatibility-settings sync until this module's
outer transaction commits. Callbacks are best effort. Inside a caller-owned
repo transaction it retains the callback's existing immediate behavior; callers
needing commit ordering must use `transaction/1` as their outer boundary.
"""
@spec after_commit((-> term())) :: :ok
def after_commit(fun) do
if Process.get(@callbacks_key) && not Process.get(@external_key) do
Process.put(@callbacks_key, [fun | Process.get(@callbacks_key)])
else
run_callback(fun)
end
:ok
end
defp run_callback(fun) do
fun.()
rescue
error ->
Logger.warning("Storage audit post-commit callback failed: #{Exception.message(error)}")
catch
:exit, reason ->
Logger.warning("Storage audit post-commit callback exited: #{inspect(reason)}")
end
@doc "Locks and reloads an audited resource so diffs describe its actual preceding state."
@spec change(struct(), (struct() -> result)) :: result | {:error, term()} when result: var
def change(%{__struct__: schema, uuid: uuid}, fun) do
transaction(fn ->
case repo().one(from(r in schema, where: r.uuid == ^uuid, lock: "FOR NO KEY UPDATE")) do
nil -> {:error, :not_found}
current -> fun.(current)
end
end)
end
@doc """
Writes one configuration entry. Insert failures roll back an enclosing audited
mutation; a standalone call returns the error. Entries are announced only after
the transaction owned by this module commits.
`opts` are the context call's: `:actor_uuid`, and `:mode` (default `"manual"` with an
actor, `"auto"` without). `audit: false` writes nothing (`:skipped`) — for a change
one context makes to another's rows as a consequence of the one that is recorded.
`metadata` is a map of string keys.
"""
@spec log(String.t(), String.t(), String.t() | nil, keyword(), map()) ::
{:ok, PhoenixKit.Activity.Entry.t()} | {:error, term()} | :skipped
def log(action, resource_type, resource_uuid, opts, metadata \\ %{}) do
if Keyword.get(opts, :audit, true),
do: transaction(fn -> write(action, resource_type, resource_uuid, opts, metadata) end),
else: :skipped
rescue
error -> failed(error)
catch
:exit, reason -> failed(reason)
end
defp write(action, resource_type, resource_uuid, opts, metadata) do
actor = Keyword.get(opts, :actor_uuid)
%{
module: @module_key,
action: action,
actor_uuid: actor,
mode: Keyword.get(opts, :mode, if(actor, do: "manual", else: "auto")),
resource_type: resource_type,
resource_uuid: resource_uuid && to_string(resource_uuid),
metadata: metadata,
permanent: true
}
|> Activity.entry_changeset()
|> repo().insert(mode: :savepoint)
|> case do
{:ok, entry} ->
Process.put(@entries_key, [entry | Process.get(@entries_key)])
{:ok, entry}
{:error, reason} ->
repo().rollback(reason)
end
end
defp failed(reason) do
if Process.get(@entries_key), do: repo().rollback(reason), else: {:error, reason}
end
defp repo, do: PhoenixKit.RepoHelper.repo()
@doc """
The `"changes"` map of an update: for each of `fields` that the changeset changes,
`%{"field" => %{"from" => old, "to" => new}}` (values made loggable). Empty when
nothing in `fields` changed.
"""
@spec changes(Ecto.Changeset.t(), [atom()]) :: %{String.t() => map()}
def changes(%Ecto.Changeset{} = changeset, fields) do
for field <- fields, Map.has_key?(changeset.changes, field), into: %{} do
{Atom.to_string(field),
%{
"from" => loggable(field, Map.get(changeset.data, field)),
"to" => loggable(field, Map.fetch!(changeset.changes, field))
}}
end
end
@doc """
The `"changes"` map between two values of the same struct (`before`, `after`) for
`fields`. Empty when none differs.
"""
@spec diff(map(), map(), [atom()]) :: %{String.t() => map()}
def diff(before, later, fields) do
for field <- fields, Map.get(before, field) != Map.get(later, field), into: %{} do
{Atom.to_string(field),
%{
"from" => loggable(field, Map.get(before, field)),
"to" => loggable(field, Map.get(later, field))
}}
end
end
@doc "Logs an update, when `changes` is not empty; `extra` is merged into the metadata."
@spec log_update(String.t(), String.t(), String.t() | nil, keyword(), map(), map()) :: :ok
def log_update(action, resource_type, uuid, opts, changes, extra \\ %{})
def log_update(_action, _type, _uuid, _opts, changes, _extra) when map_size(changes) == 0,
do: :ok
def log_update(action, resource_type, uuid, opts, changes, extra) do
log(action, resource_type, uuid, opts, Map.put(extra, Activity.changes_key(), changes))
:ok
end
defp loggable(:endpoint, value), do: Endpoint.audit_value(value)
defp loggable(:cdn_url, value), do: Endpoint.audit_value(value, local_path: false)
defp loggable(_field, value), do: loggable(value)
# Keep lists as JSON arrays rather than inspected Elixir source.
defp loggable(value) when is_list(value), do: Enum.map(value, &loggable/1)
defp loggable(nil), do: nil
defp loggable(value) when is_boolean(value) or is_number(value) or is_binary(value), do: value
defp loggable(value) when is_atom(value), do: Atom.to_string(value)
defp loggable(value), do: inspect(value)
end