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Use EXIF data of image to prefill image description

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During attachment upload Pleroma returns a "description" field. Pleroma-fe has an MR to use that to pre-fill the image description field, <https://git.pleroma.social/pleroma/pleroma-fe/-/merge_requests/1399>

* This MR allows Pleroma to read the EXIF data during upload and return the description to the FE
    * If a description is already present (e.g. because a previous module added it), it will use that
    * Otherwise it will read from the EXIF data. First it will check -ImageDescription, if that's empty, it will check -iptc:Caption-Abstract
    * If no description is found, it will simply return nil, just like before
* When people set up a new instance, they will be asked if they want to read metadata and this module will be activated if so

This was taken from an MR i did on Pleroma and isn't finished yet.
This commit is contained in:
Ilja 2022-02-14 13:14:25 +01:00
commit cd316d7269
11 changed files with 219 additions and 14 deletions
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25
lib/pleroma/upload.ex
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@ -60,12 +60,23 @@ defmodule Pleroma.Upload do
width: integer(),
height: integer(),
blurhash: String.t(),
description: String.t(),
path: String.t()
}
defstruct [:id, :name, :tempfile, :content_type, :width, :height, :blurhash, :path]
defstruct [
:id,
:name,
:tempfile,
:content_type,
:width,
:height,
:blurhash,
:description,
:path
]
defp get_description(opts, upload) do
case {opts[:description], Pleroma.Config.get([Pleroma.Upload, :default_description])} do
defp get_description(upload) do
case {upload.description, Pleroma.Config.get([Pleroma.Upload, :default_description])} do
{description, _} when is_binary(description) -> description
{_, :filename} -> upload.name
{_, str} when is_binary(str) -> str
@ -81,7 +92,7 @@ defmodule Pleroma.Upload do
with {:ok, upload} <- prepare_upload(upload, opts),
upload = %__MODULE__{upload | path: upload.path || "#{upload.id}/#{upload.name}"},
{:ok, upload} <- Pleroma.Upload.Filter.filter(opts.filters, upload),
description = get_description(opts, upload),
description = get_description(upload),
{_, true} <-
{:description_limit,
String.length(description) <= Pleroma.Config.get([:instance, :description_limit])},
@ -152,7 +163,8 @@ defmodule Pleroma.Upload do
id: UUID.generate(),
name: file.filename,
tempfile: file.path,
content_type: file.content_type
content_type: file.content_type,
description: opts.description
}}
end
end
@ -172,7 +184,8 @@ defmodule Pleroma.Upload do
id: UUID.generate(),
name: hash <> "." <> ext,
tempfile: tmp_path,
content_type: content_type
content_type: content_type,
description: opts.description
}}
end
end