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diff --git a/lib/pleroma/uploaders/s3.ex b/lib/pleroma/uploaders/s3.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Uploaders.S3 do
+  @behaviour Pleroma.Uploaders.Uploader
+  require Logger
+
+  alias Pleroma.Config
+
+  # The file name is re-encoded with S3's constraints here to comply with previous
+  # links with less strict filenames
+  @impl true
+  def get_file(file) do
+    {:ok,
+     {:url,
+      Path.join([
+        Pleroma.Upload.base_url(),
+        strict_encode(URI.decode(file))
+      ])}}
+  end
+
+  @impl true
+  def put_file(%Pleroma.Upload{} = upload) do
+    config = Config.get([__MODULE__])
+    bucket = Keyword.get(config, :bucket)
+    streaming = Keyword.get(config, :streaming_enabled)
+
+    s3_name = strict_encode(upload.path)
+
+    op =
+      if streaming do
+        op =
+          upload.tempfile
+          |> ExAws.S3.Upload.stream_file()
+          |> ExAws.S3.upload(bucket, s3_name, [
+            {:acl, :public_read},
+            {:content_type, upload.content_type}
+          ])
+
+        if Application.get_env(:tesla, :adapter) == Tesla.Adapter.Gun do
+          # set s3 upload timeout to respect :upload pool timeout
+          # timeout should be slightly larger, so s3 can retry upload on fail
+          timeout = Pleroma.HTTP.AdapterHelper.Gun.pool_timeout(:upload) + 1_000
+          opts = Keyword.put(op.opts, :timeout, timeout)
+          Map.put(op, :opts, opts)
+        else
+          op
+        end
+      else
+        {:ok, file_data} = File.read(upload.tempfile)
+
+        ExAws.S3.put_object(bucket, s3_name, file_data, [
+          {:acl, :public_read},
+          {:content_type, upload.content_type}
+        ])
+      end
+
+    case ExAws.request(op) do
+      {:ok, _} ->
+        {:ok, {:file, s3_name}}
+
+      error ->
+        Logger.error("#{__MODULE__}: #{inspect(error)}")
+        {:error, "S3 Upload failed"}
+    end
+  end
+
+  @impl true
+  def delete_file(file) do
+    [__MODULE__, :bucket]
+    |> Config.get()
+    |> ExAws.S3.delete_object(file)
+    |> ExAws.request()
+    |> case do
+      {:ok, %{status_code: 204}} -> :ok
+      error -> {:error, inspect(error)}
+    end
+  end
+
+  @regex Regex.compile!("[^0-9a-zA-Z!.*/'()_-]")
+  def strict_encode(name) do
+    String.replace(name, @regex, "-")
+  end
+end