From 543e9402d64bce556f85294f91dc690c9acec51f Mon Sep 17 00:00:00 2001
From: Alex Gleason <alex@alexgleason.me>
Date: Fri, 14 May 2021 08:38:23 -0500
Subject: [PATCH] Support blurhash

---
 lib/pleroma/upload.ex                          | 7 +++++--
 lib/pleroma/upload/filter/set_meta.ex          | 9 +++++++++
 lib/pleroma/web/activity_pub/transmogrifier.ex | 1 +
 mix.exs                                        | 3 +++
 mix.lock                                       | 1 +
 5 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/lib/pleroma/upload.ex b/lib/pleroma/upload.ex
index 4d58abd48..5570ed104 100644
--- a/lib/pleroma/upload.ex
+++ b/lib/pleroma/upload.ex
@@ -25,6 +25,7 @@ defmodule Pleroma.Upload do
   path as the temporary file is also tracked by `Plug.Upload{}` and automatically deleted once the request is over.
   * `:width` - width of the media in pixels
   * `:height` - height of the media in pixels
+  * `:blurhash` - string hash of the image encoded with the blurhash algorithm (https://blurha.sh/)
 
   Related behaviors:
 
@@ -58,9 +59,10 @@ defmodule Pleroma.Upload do
           content_type: String.t(),
           width: integer(),
           height: integer(),
+          blurhash: String.t(),
           path: String.t()
         }
-  defstruct [:id, :name, :tempfile, :content_type, :width, :height, :path]
+  defstruct [:id, :name, :tempfile, :content_type, :width, :height, :blurhash, :path]
 
   defp get_description(opts, upload) do
     case {opts[:description], Pleroma.Config.get([Pleroma.Upload, :default_description])} do
@@ -98,7 +100,8 @@ defmodule Pleroma.Upload do
            |> Maps.put_if_present("height", upload.height)
          ],
          "name" => description
-       }}
+       }
+       |> Maps.put_if_present("blurhash", upload.blurhash)}
     else
       {:description_limit, _} ->
         {:error, :description_too_long}
diff --git a/lib/pleroma/upload/filter/set_meta.ex b/lib/pleroma/upload/filter/set_meta.ex
index cccb6c371..81c48228a 100644
--- a/lib/pleroma/upload/filter/set_meta.ex
+++ b/lib/pleroma/upload/filter/set_meta.ex
@@ -23,6 +23,7 @@ defmodule Pleroma.Upload.Filter.SetMeta do
         upload
         |> Map.put(:width, image.width)
         |> Map.put(:height, image.height)
+        |> Map.put(:blurhash, get_blurhash(file))
 
       {:ok, :filtered, upload}
     rescue
@@ -33,4 +34,12 @@ defmodule Pleroma.Upload.Filter.SetMeta do
   end
 
   def filter(_), do: {:ok, :noop}
+
+  defp get_blurhash(file) do
+    with {:ok, blurhash} <- :eblurhash.magick(file) do
+      blurhash
+    else
+      _ -> nil
+    end
+  end
 end
diff --git a/lib/pleroma/web/activity_pub/transmogrifier.ex b/lib/pleroma/web/activity_pub/transmogrifier.ex
index acb4f4b3e..f601d6111 100644
--- a/lib/pleroma/web/activity_pub/transmogrifier.ex
+++ b/lib/pleroma/web/activity_pub/transmogrifier.ex
@@ -973,6 +973,7 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
         }
         |> Maps.put_if_present("width", url["width"])
         |> Maps.put_if_present("height", url["height"])
+        |> Maps.put_if_present("blurhash", data["blurhash"])
       end)
 
     Map.put(object, "attachment", attachments)
diff --git a/mix.exs b/mix.exs
index 436381f32..08581824a 100644
--- a/mix.exs
+++ b/mix.exs
@@ -198,6 +198,9 @@ defmodule Pleroma.Mixfile do
       {:open_api_spex,
        git: "https://git.pleroma.social/pleroma/elixir-libraries/open_api_spex.git",
        ref: "f296ac0924ba3cf79c7a588c4c252889df4c2edd"},
+      {:eblurhash,
+       git: "https://github.com/zotonic/eblurhash.git",
+       ref: "04a0b76eadf4de1be17726f39b6313b88708fd12"},
 
       ## dev & test
       {:ex_doc, "~> 0.22", only: :dev, runtime: false},
diff --git a/mix.lock b/mix.lock
index 99be81826..d24f9c699 100644
--- a/mix.lock
+++ b/mix.lock
@@ -29,6 +29,7 @@
   "deep_merge": {:hex, :deep_merge, "1.0.0", "b4aa1a0d1acac393bdf38b2291af38cb1d4a52806cf7a4906f718e1feb5ee961", [:mix], [], "hexpm", "ce708e5f094b9cd4e8f2be4f00d2f4250c4095be93f8cd6d018c753894885430"},
   "earmark": {:hex, :earmark, "1.4.3", "364ca2e9710f6bff494117dbbd53880d84bebb692dafc3a78eb50aa3183f2bfd", [:mix], [], "hexpm", "8cf8a291ebf1c7b9539e3cddb19e9cef066c2441b1640f13c34c1d3cfc825fec"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.10", "6603d7a603b9c18d3d20db69921527f82ef09990885ed7525003c7fe7dc86c56", [:mix], [], "hexpm", "8e2d5370b732385db2c9b22215c3f59c84ac7dda7ed7e544d7c459496ae519c0"},
+  "eblurhash": {:git, "https://github.com/zotonic/eblurhash.git", "04a0b76eadf4de1be17726f39b6313b88708fd12", [ref: "04a0b76eadf4de1be17726f39b6313b88708fd12"]},
   "ecto": {:hex, :ecto, "3.4.6", "08f7afad3257d6eb8613309af31037e16c36808dfda5a3cd0cb4e9738db030e4", [:mix], [{:decimal, "~> 1.6 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "6f13a9e2a62e75c2dcfc7207bfc65645ab387af8360db4c89fee8b5a4bf3f70b"},
   "ecto_enum": {:hex, :ecto_enum, "1.4.0", "d14b00e04b974afc69c251632d1e49594d899067ee2b376277efd8233027aec8", [:mix], [{:ecto, ">= 3.0.0", [hex: :ecto, repo: "hexpm", optional: false]}, {:ecto_sql, "> 3.0.0", [hex: :ecto_sql, repo: "hexpm", optional: false]}, {:mariaex, ">= 0.0.0", [hex: :mariaex, repo: "hexpm", optional: true]}, {:postgrex, ">= 0.0.0", [hex: :postgrex, repo: "hexpm", optional: true]}], "hexpm", "8fb55c087181c2b15eee406519dc22578fa60dd82c088be376d0010172764ee4"},
   "ecto_sql": {:hex, :ecto_sql, "3.4.5", "30161f81b167d561a9a2df4329c10ae05ff36eca7ccc84628f2c8b9fa1e43323", [:mix], [{:db_connection, "~> 2.2", [hex: :db_connection, repo: "hexpm", optional: false]}, {:ecto, "~> 3.4.3", [hex: :ecto, repo: "hexpm", optional: false]}, {:myxql, "~> 0.3.0 or ~> 0.4.0", [hex: :myxql, repo: "hexpm", optional: true]}, {:postgrex, "~> 0.15.0", [hex: :postgrex, repo: "hexpm", optional: true]}, {:tds, "~> 2.1.0", [hex: :tds, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "31990c6a3579b36a3c0841d34a94c275e727de8b84f58509da5f1b2032c98ac2"},
-- 
2.45.2