From cb40602a167f4637dc6df6633ec2dfe33f774177 Mon Sep 17 00:00:00 2001
From: Maksim Pechnikov <parallel588@gmail.com>
Date: Fri, 15 May 2020 21:34:46 +0300
Subject: [PATCH 1/6] added media proxy invalidation

---
 config/config.exs                             |  7 +++
 lib/pleroma/object.ex                         | 34 ++++++++-----
 lib/pleroma/web/media_proxy/invalidation.ex   | 19 +++++++
 .../web/media_proxy/invalidations/nginx.ex    | 12 +++++
 .../web/media_proxy/invalidations/script.ex   | 10 ++++
 .../workers/attachments_cleanup_worker.ex     | 49 ++++++++++++-------
 6 files changed, 101 insertions(+), 30 deletions(-)
 create mode 100644 lib/pleroma/web/media_proxy/invalidation.ex
 create mode 100644 lib/pleroma/web/media_proxy/invalidations/nginx.ex
 create mode 100644 lib/pleroma/web/media_proxy/invalidations/script.ex

diff --git a/config/config.exs b/config/config.exs
index e703c1632..5394c7c7a 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -378,6 +378,13 @@ config :pleroma, :rich_media,
 
 config :pleroma, :media_proxy,
   enabled: false,
+  invalidation: [
+    enabled: false,
+    provider: Pleroma.Web.MediaProxy.Invalidation.Script,
+    options: %{
+      script_path: ""
+    }
+  ],
   proxy_opts: [
     redirect_on_failure: false,
     max_body_length: 25 * 1_048_576,
diff --git a/lib/pleroma/object.ex b/lib/pleroma/object.ex
index e678fd415..66b233498 100644
--- a/lib/pleroma/object.ex
+++ b/lib/pleroma/object.ex
@@ -9,11 +9,13 @@ defmodule Pleroma.Object do
   import Ecto.Changeset
 
   alias Pleroma.Activity
+  alias Pleroma.Config
   alias Pleroma.Object
   alias Pleroma.Object.Fetcher
   alias Pleroma.ObjectTombstone
   alias Pleroma.Repo
   alias Pleroma.User
+  alias Pleroma.Workers.AttachmentsCleanupWorker
 
   require Logger
 
@@ -183,27 +185,37 @@ defmodule Pleroma.Object do
   def delete(%Object{data: %{"id" => id}} = object) do
     with {:ok, _obj} = swap_object_with_tombstone(object),
          deleted_activity = Activity.delete_all_by_object_ap_id(id),
-         {:ok, true} <- Cachex.del(:object_cache, "object:#{id}"),
-         {:ok, _} <- Cachex.del(:web_resp_cache, URI.parse(id).path) do
-      with true <- Pleroma.Config.get([:instance, :cleanup_attachments]) do
-        {:ok, _} =
-          Pleroma.Workers.AttachmentsCleanupWorker.enqueue("cleanup_attachments", %{
-            "object" => object
-          })
-      end
+         {:ok, _} <- invalid_object_cache(object) do
+      cleanup_attachments(
+        Config.get([:instance, :cleanup_attachments]),
+        %{"object" => object}
+      )
 
       {:ok, object, deleted_activity}
     end
   end
 
-  def prune(%Object{data: %{"id" => id}} = object) do
+  @spec cleanup_attachments(boolean(), %{required(:object) => map()}) ::
+          {:ok, Oban.Job.t() | nil}
+  def cleanup_attachments(true, %{"object" => _} = params) do
+    AttachmentsCleanupWorker.enqueue("cleanup_attachments", params)
+  end
+
+  def cleanup_attachments(_, _), do: {:ok, nil}
+
+  def prune(%Object{data: %{"id" => _id}} = object) do
     with {:ok, object} <- Repo.delete(object),
-         {:ok, true} <- Cachex.del(:object_cache, "object:#{id}"),
-         {:ok, _} <- Cachex.del(:web_resp_cache, URI.parse(id).path) do
+         {:ok, _} <- invalid_object_cache(object) do
       {:ok, object}
     end
   end
 
+  def invalid_object_cache(%Object{data: %{"id" => id}}) do
+    with {:ok, true} <- Cachex.del(:object_cache, "object:#{id}") do
+      Cachex.del(:web_resp_cache, URI.parse(id).path)
+    end
+  end
+
   def set_cache(%Object{data: %{"id" => ap_id}} = object) do
     Cachex.put(:object_cache, "object:#{ap_id}", object)
     {:ok, object}
diff --git a/lib/pleroma/web/media_proxy/invalidation.ex b/lib/pleroma/web/media_proxy/invalidation.ex
new file mode 100644
index 000000000..dd9a53a27
--- /dev/null
+++ b/lib/pleroma/web/media_proxy/invalidation.ex
@@ -0,0 +1,19 @@
+defmodule Pleroma.Web.MediaProxy.Invalidation do
+  @callback purge(list(String.t()), map()) :: {:ok, String.t()} | {:error, String.t()}
+
+  alias Pleroma.Config
+
+  def purge(urls) do
+    [:media_proxy, :invalidation, :enabled]
+    |> Config.get()
+    |> do_purge(urls)
+  end
+
+  defp do_purge(true, urls) do
+    config = Config.get([:media_proxy, :invalidation])
+    config[:provider].purge(urls, config[:options])
+    :ok
+  end
+
+  defp do_purge(_, _), do: :ok
+end
diff --git a/lib/pleroma/web/media_proxy/invalidations/nginx.ex b/lib/pleroma/web/media_proxy/invalidations/nginx.ex
new file mode 100644
index 000000000..5bfdd505c
--- /dev/null
+++ b/lib/pleroma/web/media_proxy/invalidations/nginx.ex
@@ -0,0 +1,12 @@
+defmodule Pleroma.Web.MediaProxy.Invalidation.Nginx do
+  @behaviour Pleroma.Web.MediaProxy.Invalidation
+
+  @impl Pleroma.Web.MediaProxy.Invalidation
+  def purge(urls, _opts) do
+    Enum.each(urls, fn url ->
+      Pleroma.HTTP.request(:purge, url, "", [], [])
+    end)
+
+    {:ok, "success"}
+  end
+end
diff --git a/lib/pleroma/web/media_proxy/invalidations/script.ex b/lib/pleroma/web/media_proxy/invalidations/script.ex
new file mode 100644
index 000000000..f458845a0
--- /dev/null
+++ b/lib/pleroma/web/media_proxy/invalidations/script.ex
@@ -0,0 +1,10 @@
+defmodule Pleroma.Web.MediaProxy.Invalidation.Script do
+  @behaviour Pleroma.Web.MediaProxy.Invalidation
+
+  @impl Pleroma.Web.MediaProxy.Invalidation
+  def purge(urls, %{script_path: script_path} = options) do
+    script_args = List.wrap(Map.get(options, :script_args, []))
+    System.cmd(Path.expand(script_path), [urls] ++ script_args)
+    {:ok, "success"}
+  end
+end
diff --git a/lib/pleroma/workers/attachments_cleanup_worker.ex b/lib/pleroma/workers/attachments_cleanup_worker.ex
index 3c5820a86..49352db2a 100644
--- a/lib/pleroma/workers/attachments_cleanup_worker.ex
+++ b/lib/pleroma/workers/attachments_cleanup_worker.ex
@@ -27,8 +27,20 @@ defmodule Pleroma.Workers.AttachmentsCleanupWorker do
 
     uploader = Pleroma.Config.get([Pleroma.Upload, :uploader])
 
+    prefix =
+      case Pleroma.Config.get([Pleroma.Upload, :base_url]) do
+        nil -> "media"
+        _ -> ""
+      end
+
+    base_url =
+      String.trim_trailing(
+        Pleroma.Config.get([Pleroma.Upload, :base_url], Pleroma.Web.base_url()),
+        "/"
+      )
+
     # find all objects for copies of the attachments, name and actor doesn't matter here
-    delete_ids =
+    object_ids_and_hrefs =
       from(o in Object,
         where:
           fragment(
@@ -67,29 +79,28 @@ defmodule Pleroma.Workers.AttachmentsCleanupWorker do
       |> Enum.map(fn {href, %{id: id, count: count}} ->
         # only delete files that have single instance
         with 1 <- count do
-          prefix =
-            case Pleroma.Config.get([Pleroma.Upload, :base_url]) do
-              nil -> "media"
-              _ -> ""
-            end
+          href
+          |> String.trim_leading("#{base_url}/#{prefix}")
+          |> uploader.delete_file()
 
-          base_url =
-            String.trim_trailing(
-              Pleroma.Config.get([Pleroma.Upload, :base_url], Pleroma.Web.base_url()),
-              "/"
-            )
-
-          file_path = String.trim_leading(href, "#{base_url}/#{prefix}")
-
-          uploader.delete_file(file_path)
+          {id, href}
+        else
+          _ -> {id, nil}
         end
-
-        id
       end)
 
-    from(o in Object, where: o.id in ^delete_ids)
+    object_ids = Enum.map(object_ids_and_hrefs, fn {id, _} -> id end)
+
+    from(o in Object, where: o.id in ^object_ids)
     |> Repo.delete_all()
+
+    object_ids_and_hrefs
+    |> Enum.filter(fn {_, href} -> not is_nil(href) end)
+    |> Enum.map(&elem(&1, 1))
+    |> Pleroma.Web.MediaProxy.Invalidation.purge()
+
+    {:ok, :success}
   end
 
-  def perform(%{"op" => "cleanup_attachments", "object" => _object}, _job), do: :ok
+  def perform(%{"op" => "cleanup_attachments", "object" => _object}, _job), do: {:ok, :skip}
 end

From 3f8d68bdf3224cd6023b3d7f8e64221222872820 Mon Sep 17 00:00:00 2001
From: Maksim Pechnikov <parallel588@gmail.com>
Date: Sat, 16 May 2020 15:16:33 +0300
Subject: [PATCH 2/6] added example cache purge script

---
 config/config.exs                             |  2 +-
 installation/nginx-cache-purge.example        | 39 +++++++++++++++++++
 .../web/media_proxy/invalidations/http.ex     | 16 ++++++++
 .../web/media_proxy/invalidations/nginx.ex    | 12 ------
 .../web/media_proxy/invalidations/script.ex   | 11 ++++--
 5 files changed, 64 insertions(+), 16 deletions(-)
 create mode 100755 installation/nginx-cache-purge.example
 create mode 100644 lib/pleroma/web/media_proxy/invalidations/http.ex
 delete mode 100644 lib/pleroma/web/media_proxy/invalidations/nginx.ex

diff --git a/config/config.exs b/config/config.exs
index 5394c7c7a..882d25069 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -382,7 +382,7 @@ config :pleroma, :media_proxy,
     enabled: false,
     provider: Pleroma.Web.MediaProxy.Invalidation.Script,
     options: %{
-      script_path: ""
+      script_path: "./installation/nginx-cache-purge.example"
     }
   ],
   proxy_opts: [
diff --git a/installation/nginx-cache-purge.example b/installation/nginx-cache-purge.example
new file mode 100755
index 000000000..12dfa733c
--- /dev/null
+++ b/installation/nginx-cache-purge.example
@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# A simple Bash script to delete an media from the Nginx cache.
+
+SCRIPTNAME=${0##*/}
+
+# NGINX cache directory 
+CACHE_DIRECTORY="/tmp/pleroma-media-cache"
+
+function get_cache_files() {
+    local max_parallel=${3-16}
+    find $2 -maxdepth 1 -type d | xargs -P $max_parallel -n 1 grep -ERl "^KEY:.*$1" | sort -u
+}
+
+function purge_item() {
+  local cache_files
+  cache_files=$(get_cache_files "$1" "$2")
+
+  if [ -n "$cache_files" ]; then
+    for i in $cache_files; do
+      [ -f $i ] || continue
+      echo "Deleting $i from $2."
+      rm $i
+    done
+  else
+    echo "$1 is not cached."
+  fi  
+}
+
+function purge() {
+  for url in "$@"
+  do
+    echo "$SCRIPTNAME delete $url from cache ($CACHE_DIRECTORY)"
+    purge_item $url $CACHE_DIRECTORY
+  done
+
+}
+
+purge $1 
diff --git a/lib/pleroma/web/media_proxy/invalidations/http.ex b/lib/pleroma/web/media_proxy/invalidations/http.ex
new file mode 100644
index 000000000..40c624efc
--- /dev/null
+++ b/lib/pleroma/web/media_proxy/invalidations/http.ex
@@ -0,0 +1,16 @@
+defmodule Pleroma.Web.MediaProxy.Invalidation.Http do
+  @behaviour Pleroma.Web.MediaProxy.Invalidation
+
+  @impl Pleroma.Web.MediaProxy.Invalidation
+  def purge(urls, opts) do
+    method = Map.get(opts, :http_method, :purge)
+    headers = Map.get(opts, :http_headers, [])
+    options = Map.get(opts, :http_options, [])
+
+    Enum.each(urls, fn url ->
+      Pleroma.HTTP.request(method, url, "", headers, options)
+    end)
+
+    {:ok, "success"}
+  end
+end
diff --git a/lib/pleroma/web/media_proxy/invalidations/nginx.ex b/lib/pleroma/web/media_proxy/invalidations/nginx.ex
deleted file mode 100644
index 5bfdd505c..000000000
--- a/lib/pleroma/web/media_proxy/invalidations/nginx.ex
+++ /dev/null
@@ -1,12 +0,0 @@
-defmodule Pleroma.Web.MediaProxy.Invalidation.Nginx do
-  @behaviour Pleroma.Web.MediaProxy.Invalidation
-
-  @impl Pleroma.Web.MediaProxy.Invalidation
-  def purge(urls, _opts) do
-    Enum.each(urls, fn url ->
-      Pleroma.HTTP.request(:purge, url, "", [], [])
-    end)
-
-    {:ok, "success"}
-  end
-end
diff --git a/lib/pleroma/web/media_proxy/invalidations/script.ex b/lib/pleroma/web/media_proxy/invalidations/script.ex
index f458845a0..94c79511a 100644
--- a/lib/pleroma/web/media_proxy/invalidations/script.ex
+++ b/lib/pleroma/web/media_proxy/invalidations/script.ex
@@ -2,9 +2,14 @@ defmodule Pleroma.Web.MediaProxy.Invalidation.Script do
   @behaviour Pleroma.Web.MediaProxy.Invalidation
 
   @impl Pleroma.Web.MediaProxy.Invalidation
-  def purge(urls, %{script_path: script_path} = options) do
-    script_args = List.wrap(Map.get(options, :script_args, []))
-    System.cmd(Path.expand(script_path), [urls] ++ script_args)
+  def purge(urls, %{script_path: script_path} = _options) do
+    args =
+      urls
+      |> List.wrap()
+      |> Enum.uniq()
+      |> Enum.join(" ")
+
+    System.cmd(Path.expand(script_path), [args])
     {:ok, "success"}
   end
 end

From c33a4315fb09e67d0ed5f644877054a3fb7b1fe1 Mon Sep 17 00:00:00 2001
From: Maksim Pechnikov <parallel588@gmail.com>
Date: Mon, 18 May 2020 06:48:19 +0300
Subject: [PATCH 3/6] updated docs

---
 config/config.exs                             |  5 +----
 docs/configuration/cheatsheet.md              | 20 +++++++++++++++++++
 lib/pleroma/web/media_proxy/invalidation.ex   |  5 +++--
 .../web/media_proxy/invalidations/http.ex     |  6 +++---
 4 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/config/config.exs b/config/config.exs
index 882d25069..25cf2a9b9 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -380,10 +380,7 @@ config :pleroma, :media_proxy,
   enabled: false,
   invalidation: [
     enabled: false,
-    provider: Pleroma.Web.MediaProxy.Invalidation.Script,
-    options: %{
-      script_path: "./installation/nginx-cache-purge.example"
-    }
+    provider: Pleroma.Web.MediaProxy.Invalidation.Script
   ],
   proxy_opts: [
     redirect_on_failure: false,
diff --git a/docs/configuration/cheatsheet.md b/docs/configuration/cheatsheet.md
index 1078c4e87..aaea3f46c 100644
--- a/docs/configuration/cheatsheet.md
+++ b/docs/configuration/cheatsheet.md
@@ -249,6 +249,26 @@ This section describe PWA manifest instance-specific values. Currently this opti
 * `base_url`: The base URL to access a user-uploaded file. Useful when you want to proxy the media files via another host/CDN fronts.
 * `proxy_opts`: All options defined in `Pleroma.ReverseProxy` documentation, defaults to `[max_body_length: (25*1_048_576)]`.
 * `whitelist`: List of domains to bypass the mediaproxy
+* `invalidation`: options for remove media from cache after delete object:
+    * `enabled`: Enables purge cache
+    * `provider`: Which one of  the [purge cache strategy](#purge-cache-strategy) to use.
+
+### Purge cache strategy
+
+#### Pleroma.Web.MediaProxy.Invalidation.Script
+
+This strategy allow perform external bash script to purge cache.
+Urls of attachments pass to script as arguments.
+
+* `script_path`: path to external script.
+
+#### Pleroma.Web.MediaProxy.Invalidation.Http
+
+This strategy allow perform custom http request to purge cache.
+
+* `method`: http method. default is `purge`
+* `headers`: http headers. default is empty
+* `options`: request options. default is empty
 
 ## Link previews
 
diff --git a/lib/pleroma/web/media_proxy/invalidation.ex b/lib/pleroma/web/media_proxy/invalidation.ex
index dd9a53a27..371aa8ae0 100644
--- a/lib/pleroma/web/media_proxy/invalidation.ex
+++ b/lib/pleroma/web/media_proxy/invalidation.ex
@@ -10,8 +10,9 @@ defmodule Pleroma.Web.MediaProxy.Invalidation do
   end
 
   defp do_purge(true, urls) do
-    config = Config.get([:media_proxy, :invalidation])
-    config[:provider].purge(urls, config[:options])
+    provider = Config.get([:media_proxy, :invalidation, :provider])
+    options = Config.get(provider)
+    provider.purge(urls, options)
     :ok
   end
 
diff --git a/lib/pleroma/web/media_proxy/invalidations/http.ex b/lib/pleroma/web/media_proxy/invalidations/http.ex
index 40c624efc..66fafa7ba 100644
--- a/lib/pleroma/web/media_proxy/invalidations/http.ex
+++ b/lib/pleroma/web/media_proxy/invalidations/http.ex
@@ -3,9 +3,9 @@ defmodule Pleroma.Web.MediaProxy.Invalidation.Http do
 
   @impl Pleroma.Web.MediaProxy.Invalidation
   def purge(urls, opts) do
-    method = Map.get(opts, :http_method, :purge)
-    headers = Map.get(opts, :http_headers, [])
-    options = Map.get(opts, :http_options, [])
+    method = Map.get(opts, :method, :purge)
+    headers = Map.get(opts, :headers, [])
+    options = Map.get(opts, :options, [])
 
     Enum.each(urls, fn url ->
       Pleroma.HTTP.request(method, url, "", headers, options)

From 5f0a3ac74d51333a778e6be26876fe26b0ff625b Mon Sep 17 00:00:00 2001
From: Maksim Pechnikov <parallel588@gmail.com>
Date: Mon, 18 May 2020 09:22:26 +0300
Subject: [PATCH 4/6] added tests

---
 docs/configuration/cheatsheet.md              | 14 ++++++++
 lib/pleroma/web/media_proxy/invalidation.ex   |  8 ++++-
 .../web/media_proxy/invalidations/http.ex     | 26 +++++++++++++-
 .../web/media_proxy/invalidations/script.ex   | 30 ++++++++++++++--
 .../media_proxy/invalidations/http_test.exs   | 35 +++++++++++++++++++
 .../media_proxy/invalidations/script_test.exs | 20 +++++++++++
 6 files changed, 129 insertions(+), 4 deletions(-)
 create mode 100644 test/web/media_proxy/invalidations/http_test.exs
 create mode 100644 test/web/media_proxy/invalidations/script_test.exs

diff --git a/docs/configuration/cheatsheet.md b/docs/configuration/cheatsheet.md
index aaea3f46c..ddea6a4fb 100644
--- a/docs/configuration/cheatsheet.md
+++ b/docs/configuration/cheatsheet.md
@@ -262,6 +262,12 @@ Urls of attachments pass to script as arguments.
 
 * `script_path`: path to external script.
 
+Example:
+```elixir
+config :pleroma, Pleroma.Web.MediaProxy.Invalidation.Script,
+  script_path: "./installation/nginx-cache-purge.example"
+```
+
 #### Pleroma.Web.MediaProxy.Invalidation.Http
 
 This strategy allow perform custom http request to purge cache.
@@ -270,6 +276,14 @@ This strategy allow perform custom http request to purge cache.
 * `headers`: http headers. default is empty
 * `options`: request options. default is empty
 
+Example:
+```elixir
+config :pleroma, Pleroma.Web.MediaProxy.Invalidation.Http,
+  method: :purge,
+  headers: [],
+  options: []
+```
+
 ## Link previews
 
 ### Pleroma.Web.Metadata (provider)
diff --git a/lib/pleroma/web/media_proxy/invalidation.ex b/lib/pleroma/web/media_proxy/invalidation.ex
index 371aa8ae0..c037ff13e 100644
--- a/lib/pleroma/web/media_proxy/invalidation.ex
+++ b/lib/pleroma/web/media_proxy/invalidation.ex
@@ -1,8 +1,15 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.Web.MediaProxy.Invalidation do
+  @moduledoc false
+
   @callback purge(list(String.t()), map()) :: {:ok, String.t()} | {:error, String.t()}
 
   alias Pleroma.Config
 
+  @spec purge(list(String.t())) :: {:ok, String.t()} | {:error, String.t()}
   def purge(urls) do
     [:media_proxy, :invalidation, :enabled]
     |> Config.get()
@@ -13,7 +20,6 @@ defmodule Pleroma.Web.MediaProxy.Invalidation do
     provider = Config.get([:media_proxy, :invalidation, :provider])
     options = Config.get(provider)
     provider.purge(urls, options)
-    :ok
   end
 
   defp do_purge(_, _), do: :ok
diff --git a/lib/pleroma/web/media_proxy/invalidations/http.ex b/lib/pleroma/web/media_proxy/invalidations/http.ex
index 66fafa7ba..07248df6e 100644
--- a/lib/pleroma/web/media_proxy/invalidations/http.ex
+++ b/lib/pleroma/web/media_proxy/invalidations/http.ex
@@ -1,16 +1,40 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.Web.MediaProxy.Invalidation.Http do
+  @moduledoc false
   @behaviour Pleroma.Web.MediaProxy.Invalidation
 
+  require Logger
+
   @impl Pleroma.Web.MediaProxy.Invalidation
   def purge(urls, opts) do
     method = Map.get(opts, :method, :purge)
     headers = Map.get(opts, :headers, [])
     options = Map.get(opts, :options, [])
 
+    Logger.debug("Running cache purge: #{inspect(urls)}")
+
     Enum.each(urls, fn url ->
-      Pleroma.HTTP.request(method, url, "", headers, options)
+      with {:error, error} <- do_purge(method, url, headers, options) do
+        Logger.error("Error while cache purge: url - #{url}, error: #{inspect(error)}")
+      end
     end)
 
     {:ok, "success"}
   end
+
+  defp do_purge(method, url, headers, options) do
+    case Pleroma.HTTP.request(method, url, "", headers, options) do
+      {:ok, %{status: status} = env} when 400 <= status and status < 500 ->
+        {:error, env}
+
+      {:error, error} = error ->
+        error
+
+      _ ->
+        {:ok, "success"}
+    end
+  end
 end
diff --git a/lib/pleroma/web/media_proxy/invalidations/script.ex b/lib/pleroma/web/media_proxy/invalidations/script.ex
index 94c79511a..6be782132 100644
--- a/lib/pleroma/web/media_proxy/invalidations/script.ex
+++ b/lib/pleroma/web/media_proxy/invalidations/script.ex
@@ -1,6 +1,14 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.Web.MediaProxy.Invalidation.Script do
+  @moduledoc false
+
   @behaviour Pleroma.Web.MediaProxy.Invalidation
 
+  require Logger
+
   @impl Pleroma.Web.MediaProxy.Invalidation
   def purge(urls, %{script_path: script_path} = _options) do
     args =
@@ -9,7 +17,25 @@ defmodule Pleroma.Web.MediaProxy.Invalidation.Script do
       |> Enum.uniq()
       |> Enum.join(" ")
 
-    System.cmd(Path.expand(script_path), [args])
-    {:ok, "success"}
+    path = Path.expand(script_path)
+
+    Logger.debug("Running cache purge: #{inspect(urls)}, #{path}")
+
+    case do_purge(path, [args]) do
+      {result, exit_status} when exit_status > 0 ->
+        Logger.error("Error while cache purge: #{inspect(result)}")
+        {:error, inspect(result)}
+
+      _ ->
+        {:ok, "success"}
+    end
+  end
+
+  def purge(_, _), do: {:error, "not found script path"}
+
+  defp do_purge(path, args) do
+    System.cmd(path, args)
+  rescue
+    error -> {inspect(error), 1}
   end
 end
diff --git a/test/web/media_proxy/invalidations/http_test.exs b/test/web/media_proxy/invalidations/http_test.exs
new file mode 100644
index 000000000..8a3b4141c
--- /dev/null
+++ b/test/web/media_proxy/invalidations/http_test.exs
@@ -0,0 +1,35 @@
+defmodule Pleroma.Web.MediaProxy.Invalidation.HttpTest do
+  use ExUnit.Case
+  alias Pleroma.Web.MediaProxy.Invalidation
+
+  import ExUnit.CaptureLog
+  import Tesla.Mock
+
+  test "logs hasn't error message when request is valid" do
+    mock(fn
+      %{method: :purge, url: "http://example.com/media/example.jpg"} ->
+        %Tesla.Env{status: 200}
+    end)
+
+    refute capture_log(fn ->
+             assert Invalidation.Http.purge(
+                      ["http://example.com/media/example.jpg"],
+                      %{}
+                    ) == {:ok, "success"}
+           end) =~ "Error while cache purge"
+  end
+
+  test "it write error message in logs when request invalid" do
+    mock(fn
+      %{method: :purge, url: "http://example.com/media/example1.jpg"} ->
+        %Tesla.Env{status: 404}
+    end)
+
+    assert capture_log(fn ->
+             assert Invalidation.Http.purge(
+                      ["http://example.com/media/example1.jpg"],
+                      %{}
+                    ) == {:ok, "success"}
+           end) =~ "Error while cache purge: url - http://example.com/media/example1.jpg"
+  end
+end
diff --git a/test/web/media_proxy/invalidations/script_test.exs b/test/web/media_proxy/invalidations/script_test.exs
new file mode 100644
index 000000000..1358963ab
--- /dev/null
+++ b/test/web/media_proxy/invalidations/script_test.exs
@@ -0,0 +1,20 @@
+defmodule Pleroma.Web.MediaProxy.Invalidation.ScriptTest do
+  use ExUnit.Case
+  alias Pleroma.Web.MediaProxy.Invalidation
+
+  import ExUnit.CaptureLog
+
+  test "it logger error when script not found" do
+    assert capture_log(fn ->
+             assert Invalidation.Script.purge(
+                      ["http://example.com/media/example.jpg"],
+                      %{script_path: "./example"}
+                    ) == {:error, "\"%ErlangError{original: :enoent}\""}
+           end) =~ "Error while cache purge: \"%ErlangError{original: :enoent}\""
+
+    assert Invalidation.Script.purge(
+             ["http://example.com/media/example.jpg"],
+             %{}
+           ) == {:error, "not found script path"}
+  end
+end

From b5b9d161cddd1b6650cde00cf0f3cbf56ab7a4a3 Mon Sep 17 00:00:00 2001
From: Maksim Pechnikov <parallel588@gmail.com>
Date: Wed, 20 May 2020 06:56:04 +0300
Subject: [PATCH 5/6] update purge script

---
 installation/nginx-cache-purge.example    | 39 ----------------------
 installation/nginx-cache-purge.sh.example | 40 +++++++++++++++++++++++
 2 files changed, 40 insertions(+), 39 deletions(-)
 delete mode 100755 installation/nginx-cache-purge.example
 create mode 100755 installation/nginx-cache-purge.sh.example

diff --git a/installation/nginx-cache-purge.example b/installation/nginx-cache-purge.example
deleted file mode 100755
index 12dfa733c..000000000
--- a/installation/nginx-cache-purge.example
+++ /dev/null
@@ -1,39 +0,0 @@
-#!/bin/bash
-
-# A simple Bash script to delete an media from the Nginx cache.
-
-SCRIPTNAME=${0##*/}
-
-# NGINX cache directory 
-CACHE_DIRECTORY="/tmp/pleroma-media-cache"
-
-function get_cache_files() {
-    local max_parallel=${3-16}
-    find $2 -maxdepth 1 -type d | xargs -P $max_parallel -n 1 grep -ERl "^KEY:.*$1" | sort -u
-}
-
-function purge_item() {
-  local cache_files
-  cache_files=$(get_cache_files "$1" "$2")
-
-  if [ -n "$cache_files" ]; then
-    for i in $cache_files; do
-      [ -f $i ] || continue
-      echo "Deleting $i from $2."
-      rm $i
-    done
-  else
-    echo "$1 is not cached."
-  fi  
-}
-
-function purge() {
-  for url in "$@"
-  do
-    echo "$SCRIPTNAME delete $url from cache ($CACHE_DIRECTORY)"
-    purge_item $url $CACHE_DIRECTORY
-  done
-
-}
-
-purge $1 
diff --git a/installation/nginx-cache-purge.sh.example b/installation/nginx-cache-purge.sh.example
new file mode 100755
index 000000000..aaa195324
--- /dev/null
+++ b/installation/nginx-cache-purge.sh.example
@@ -0,0 +1,40 @@
+#!/bin/sh
+
+# A simple shell script to delete a media from the Nginx cache.
+
+SCRIPTNAME=${0##*/}
+
+# NGINX cache directory
+CACHE_DIRECTORY="/tmp/pleroma-media-cache"
+
+## Return the files where the items are cached.
+## $1 - the filename, can be a pattern .
+## $2 - the cache directory.
+## $3 - (optional) the number of parallel processes to run for grep.
+get_cache_files() {
+    local max_parallel=${3-16}
+    find $2 -maxdepth 2 -type d | xargs -P $max_parallel -n 1 grep -ERl "^KEY:.*$1" | sort -u
+}
+
+## Removes an item from the given cache zone.
+## $1 - the filename, can be a pattern .
+## $2 - the cache directory.
+purge_item() {
+  for f in $(get_cache_files $1 $2); do
+      echo "found file: $f"
+      [ -f $f ] || continue
+      echo "Deleting $f from $2."
+      rm $f
+  done
+} # purge_item
+
+purge() {
+  for url in "$@"
+  do
+    echo "$SCRIPTNAME delete \`$url\` from cache ($CACHE_DIRECTORY)"
+    purge_item $url $CACHE_DIRECTORY
+  done
+
+}
+
+purge $1

From 376147fb828a75b5000262a376cee173bfc98551 Mon Sep 17 00:00:00 2001
From: Maksim <parallel588@gmail.com>
Date: Wed, 20 May 2020 04:12:21 +0000
Subject: [PATCH 6/6] Apply suggestion to
 installation/nginx-cache-purge.sh.example

---
 installation/nginx-cache-purge.sh.example | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/installation/nginx-cache-purge.sh.example b/installation/nginx-cache-purge.sh.example
index aaa195324..b2915321c 100755
--- a/installation/nginx-cache-purge.sh.example
+++ b/installation/nginx-cache-purge.sh.example
@@ -13,7 +13,7 @@ CACHE_DIRECTORY="/tmp/pleroma-media-cache"
 ## $3 - (optional) the number of parallel processes to run for grep.
 get_cache_files() {
     local max_parallel=${3-16}
-    find $2 -maxdepth 2 -type d | xargs -P $max_parallel -n 1 grep -ERl "^KEY:.*$1" | sort -u
+    find $2 -maxdepth 2 -type d | xargs -P $max_parallel -n 1 grep -E Rl "^KEY:.*$1" | sort -u
 }
 
 ## Removes an item from the given cache zone.