add corner intensities and mime type hooks

lib/philomena/intensities.ex

@@ -0,0 +1,23 @@
+defmodule Philomena.Intensities do
+  @doc """
+  Gets the corner intensities of the given image file.
+  The image file must be in the PNG or JPEG format.
+  """
+  @spec file(String.t()) :: {:ok, map()} | :error
+  def file(input) do
+    System.cmd("image-intensities", [input])
+    |> case do
+      {output, 0} ->
+        [nw, ne, sw, se] =
+          output
+          |> String.trim()
+          |> String.split("\t")
+          |> Enum.map(&String.to_float/1)
+
+        {:ok, %{nw: nw, ne: ne, sw: sw, se: se}}
+
+      _error ->
+        :error
+    end
+  end
+end

lib/philomena/mime.ex

@@ -0,0 +1,16 @@
+defmodule Philomena.Mime do
+  @doc """
+  Gets the MIME type of the given pathname.
+  """
+  @spec file(String.t()) :: {:ok, binary()} | :error
+  def file(path) do
+    System.cmd("file", ["-b", "--mime-type", path])
+    |> case do
+      {output, 0} ->
+        {:ok, String.trim(output)}
+
+      _error ->
+        :error
+    end
+  end
+end

vagrant/install.bash

@@ -54,11 +54,21 @@ apt-get update
 if ! install_packages build-essential postgresql-11 libpq-dev nginx nodejs \
                       elasticsearch esl-erlang elixir inotify-tools git \
                       redis-server automake libtool zlib1g-dev ffmpeg \
-                      libavutil-dev libavcodec-dev libavformat-dev ; then
+                      libavutil-dev libavcodec-dev libavformat-dev \
+                      libmagic-dev libpng-dev; then
     >&2 echo "Installation of dependencies failed."
     exit 1
 fi
 
+if [ ! -f /usr/local/bin/image-intensities ]; then
+    pushd .
+    cd /tmp
+    git clone https://github.com/derpibooru/cli_intensities
+    cd cli_intensities
+    make install
+    popd
+fi
+
 sed -i -e 's/\(-Xm[sx]\)1g/\1256m/' /etc/elasticsearch/jvm.options
 systemctl enable elasticsearch 2>/dev/null
 service elasticsearch start