Add basic metadata to opengraph preview

Also refactor datetime & address utils

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mobilizon/cldr.ex

@@ -5,6 +5,7 @@ defmodule Mobilizon.Cldr do
 
   use Cldr,
     locales: Application.get_env(:mobilizon, :cldr)[:locales],
+    add_fallback_locales: true,
     gettext:
       if(Application.fetch_env!(:mobilizon, :env) == :prod,
         do: Mobilizon.Web.Gettext,

lib/service/address/address.ex

@@ -0,0 +1,95 @@
+defmodule Mobilizon.Service.Address do
+  @moduledoc """
+  Module to render an `Mobilizon.Addresses.Address` struct to a string
+  """
+
+  alias Mobilizon.Addresses.Address, as: AddressModel
+
+  @type address :: %{name: String.t(), alternative_name: String.t()}
+
+  def render_address(%AddressModel{} = address) do
+    %{name: name, alternative_name: alternative_name} = render_names(address)
+
+    cond do
+      defined?(alternative_name) && defined?(name) ->
+        "#{name}, #{alternative_name}"
+
+      defined?(name) ->
+        name
+
+      defined?(alternative_name) ->
+        alternative_name
+
+      true ->
+        raise ArgumentError, message: "Invalid address"
+    end
+  end
+
+  @spec render_names(AddressModel.t()) :: address()
+  def render_names(%AddressModel{type: nil} = address) do
+    render_names(%AddressModel{address | type: "house"})
+  end
+
+  def render_names(%AddressModel{
+        type: type,
+        description: description,
+        postal_code: postal_code,
+        locality: locality,
+        country: country
+      })
+      when type in ["house", "street", "secondary"] do
+    %{
+      name: description,
+      alternative_name: [postal_code, locality, country] |> Enum.filter(& &1) |> Enum.join(", ")
+    }
+  end
+
+  def render_names(%AddressModel{
+        type: type,
+        description: description,
+        postal_code: postal_code,
+        locality: locality,
+        country: country
+      })
+      when type in ["zone", "city", "administrative"] do
+    %{
+      name: if(defined?(postal_code), do: "#{description} (#{postal_code})", else: description),
+      alternative_name:
+        [locality, country]
+        |> Enum.filter(& &1)
+        |> Enum.filter(&(&1 != description))
+        |> Enum.join(", ")
+    }
+  end
+
+  def render_names(%AddressModel{
+        description: description,
+        street: street,
+        region: region,
+        locality: locality,
+        country: country
+      }) do
+    alternative_name =
+      cond do
+        defined?(street) ->
+          if defined?(locality), do: "#{street} (#{locality})", else: street
+
+        defined?(locality) ->
+          "#{locality}, #{region}, #{country}"
+
+        defined?(region) ->
+          "#{region}, #{country}"
+
+        defined?(country) ->
+          country
+
+        true ->
+          nil
+      end
+
+    %{name: description, alternative_name: alternative_name}
+  end
+
+  defp defined?(string) when is_binary(string), do: String.trim(string) != ""
+  defp defined?(_), do: false
+end

lib/service/date_time/date_time.ex

@@ -0,0 +1,41 @@
+defmodule Mobilizon.Service.DateTime do
+  @moduledoc """
+  Module to represent a datetime in a given locale
+  """
+  alias Cldr.DateTime.Relative
+
+  def datetime_to_string(%DateTime{} = datetime, locale \\ "en", format \\ :medium) do
+    Mobilizon.Cldr.DateTime.to_string!(datetime, format: format, locale: locale_or_default(locale))
+  end
+
+  def datetime_to_time_string(%DateTime{} = datetime, locale \\ "en", format \\ :short) do
+    Mobilizon.Cldr.Time.to_string!(datetime, format: format, locale: locale_or_default(locale))
+  end
+
+  @spec datetime_tz_convert(DateTime.t(), String.t()) :: DateTime.t()
+  def datetime_tz_convert(%DateTime{} = datetime, timezone) do
+    case DateTime.shift_zone(datetime, timezone) do
+      {:ok, datetime_with_user_tz} ->
+        datetime_with_user_tz
+
+      _ ->
+        datetime
+    end
+  end
+
+  @spec datetime_relative(DateTime.t(), String.t()) :: String.t()
+  def datetime_relative(%DateTime{} = datetime, locale \\ "en") do
+    Relative.to_string!(datetime, Mobilizon.Cldr,
+      relative_to: DateTime.utc_now(),
+      locale: locale_or_default(locale)
+    )
+  end
+
+  defp locale_or_default(locale) do
+    if Mobilizon.Cldr.known_locale_name(locale) do
+      locale
+    else
+      "en"
+    end
+  end
+end

lib/service/metadata/event.ex

@@ -1,19 +1,22 @@
 defimpl Mobilizon.Service.Metadata, for: Mobilizon.Events.Event do
   alias Phoenix.HTML
   alias Phoenix.HTML.Tag
+  alias Mobilizon.Addresses.Address
   alias Mobilizon.Events.Event
   alias Mobilizon.Web.JsonLD.ObjectView
-  import Mobilizon.Service.Metadata.Utils, only: [process_description: 2, strip_tags: 1]
+
+  import Mobilizon.Service.Metadata.Utils,
+    only: [process_description: 2, strip_tags: 1, datetime_to_string: 2, render_address: 1]
 
   def build_tags(%Event{} = event, locale \\ "en") do
-    event = Map.put(event, :description, process_description(event.description, locale))
+    formatted_description = description(event, locale)
 
     tags = [
       Tag.content_tag(:title, event.title <> " - Mobilizon"),
-      Tag.tag(:meta, name: "description", content: event.description),
+      Tag.tag(:meta, name: "description", content: process_description(event.description, locale)),
       Tag.tag(:meta, property: "og:title", content: event.title),
       Tag.tag(:meta, property: "og:url", content: event.url),
-      Tag.tag(:meta, property: "og:description", content: event.description),
+      Tag.tag(:meta, property: "og:description", content: formatted_description),
       Tag.tag(:meta, property: "og:type", content: "website"),
       # Tell Search Engines what's the origin
       Tag.tag(:link, rel: "canonical", href: event.url)
@@ -45,4 +48,25 @@ defimpl Mobilizon.Service.Metadata, for: Mobilizon.Events.Event do
     |> ObjectView.render(%{event: %{event | title: strip_tags(title)}})
     |> Jason.encode!()
   end
+
+  defp description(
+         %Event{
+           description: description,
+           begins_on: begins_on,
+           physical_address: %Address{} = address
+         },
+         locale
+       ) do
+    "#{datetime_to_string(begins_on, locale)} - #{render_address(address)} - #{process_description(description, locale)}"
+  end
+
+  defp description(
+         %Event{
+           description: description,
+           begins_on: begins_on
+         },
+         locale
+       ) do
+    "#{datetime_to_string(begins_on, locale)} - #{process_description(description, locale)}"
+  end
 end

lib/service/metadata/utils.ex

@@ -3,6 +3,7 @@ defmodule Mobilizon.Service.Metadata.Utils do
   Tools to convert tags to string.
   """
 
+  alias Mobilizon.Service.{Address, DateTime}
   alias Mobilizon.Service.Formatter.HTML, as: HTMLFormatter
   alias Phoenix.HTML
   import Mobilizon.Web.Gettext
@@ -52,6 +53,9 @@ defmodule Mobilizon.Service.Metadata.Utils do
     gettext("The event organizer didn't add any description.")
   end
 
+  defdelegate datetime_to_string(datetime, locale \\ "en", format \\ :medium), to: DateTime
+  defdelegate render_address(address), to: Address
+
   defp maybe_slice(description, limit) do
     if String.length(description) > limit do
       description

lib/web/views/email_view.ex

@@ -1,39 +1,15 @@
 defmodule Mobilizon.Web.EmailView do
   use Mobilizon.Web, :view
 
-  alias Cldr.DateTime.Relative
+  alias Mobilizon.Service.DateTime, as: DateTimeRenderer
   import Mobilizon.Web.Gettext
 
-  def datetime_to_string(%DateTime{} = datetime, locale \\ "en", format \\ :medium) do
-    with {:ok, string} <-
-           Mobilizon.Cldr.DateTime.to_string(datetime, format: format, locale: locale) do
-      string
-    end
-  end
+  defdelegate datetime_to_string(datetime, locale \\ "en", format \\ :medium),
+    to: DateTimeRenderer
 
-  def datetime_to_time_string(%DateTime{} = datetime, locale \\ "en", format \\ :hm) do
-    with {:ok, string} <-
-           Mobilizon.Cldr.DateTime.to_string(datetime, format: format, locale: locale) do
-      string
-    end
-  end
+  defdelegate datetime_to_time_string(datetime, locale \\ "en", format \\ :short),
+    to: DateTimeRenderer
 
-  @spec datetime_tz_convert(DateTime.t(), String.t()) :: DateTime.t()
-  def datetime_tz_convert(%DateTime{} = datetime, timezone) do
-    case DateTime.shift_zone(datetime, timezone) do
-      {:ok, datetime_with_user_tz} ->
-        datetime_with_user_tz
-
-      _ ->
-        datetime
-    end
-  end
-
-  @spec datetime_relative(DateTime.t(), String.t()) :: String.t()
-  def datetime_relative(%DateTime{} = datetime, locale \\ "en") do
-    Relative.to_string!(datetime, Mobilizon.Cldr,
-      relative_to: DateTime.utc_now(),
-      locale: locale
-    )
-  end
+  defdelegate datetime_tz_convert(datetime, timezone), to: DateTimeRenderer
+  defdelegate datetime_relative(datetime, locale \\ "en"), to: DateTimeRenderer
 end

test/service/address/address_test.exs

@@ -0,0 +1,58 @@
+defmodule Mobilizon.Service.AddressTest do
+  @moduledoc """
+  Test representing addresses
+  """
+  use Mobilizon.DataCase
+  alias Mobilizon.Addresses.Address
+  alias Mobilizon.Service.Address, as: AddressRenderer
+  import Mobilizon.Factory
+
+  describe "render an address" do
+    test "basic" do
+      %Address{} = address = insert(:address)
+
+      assert AddressRenderer.render_address(address) ==
+               "#{address.description}, #{address.postal_code}, #{address.locality}, #{address.country}"
+    end
+
+    test "a house" do
+      assert AddressRenderer.render_address(%Address{
+               description: "somewhere",
+               type: "house",
+               postal_code: "35000",
+               locality: "Rennes"
+             }) ==
+               "somewhere, 35000, Rennes"
+    end
+
+    test "a city" do
+      assert AddressRenderer.render_address(%Address{
+               description: "Rennes",
+               type: "city",
+               postal_code: "35000",
+               locality: "Rennes"
+             }) ==
+               "Rennes (35000)"
+    end
+
+    test "a region" do
+      assert AddressRenderer.render_address(%Address{
+               description: "Ille et Vilaine",
+               type: "administrative",
+               postal_code: "",
+               locality: ""
+             }) ==
+               "Ille et Vilaine"
+    end
+
+    test "only with description" do
+      assert AddressRenderer.render_address(%Address{description: "somewhere"}) == "somewhere"
+    end
+
+    test "with no data" do
+      assert_raise ArgumentError, "Invalid address", fn ->
+        AddressRenderer.render_address(%Address{})
+      end
+    end
+  end
+end

test/service/date_time/date_time.exs

@@ -0,0 +1,71 @@
+defmodule Mobilizon.Service.DateTimeTest do
+  @moduledoc """
+  Test representing datetimes in defined locale
+  """
+  use Mobilizon.DataCase
+  alias Mobilizon.Service.DateTime, as: DateTimeRenderer
+
+  @datetime "2021-06-22T15:25:29.531539Z"
+
+  describe "render a datetime to string" do
+    test "standard datetime" do
+      {:ok, datetime, _} = DateTime.from_iso8601(@datetime)
+      assert DateTimeRenderer.datetime_to_string(datetime) == "Jun 22, 2021, 3:25:29 PM"
+      assert DateTimeRenderer.datetime_to_string(datetime, "fr") == "22 juin 2021, 15:25:29"
+
+      assert DateTimeRenderer.datetime_to_string(datetime, "fr", :long) ==
+               "22 juin 2021 à 15:25:29 UTC"
+    end
+
+    test "non existing or loaded locale fallbacks to english" do
+      {:ok, datetime, _} = DateTime.from_iso8601(@datetime)
+
+      assert DateTimeRenderer.datetime_to_string(datetime, "es") == "Jun 22, 2021, 3:25:29 PM"
+    end
+  end
+
+  describe "render a time to string" do
+    test "standard time" do
+      {:ok, datetime, _} = DateTime.from_iso8601(@datetime)
+      assert DateTimeRenderer.datetime_to_time_string(datetime) == "3:25 PM"
+      assert DateTimeRenderer.datetime_to_time_string(datetime, "fr") == "15:25"
+    end
+
+    test "non existing or loaded locale fallbacks to english" do
+      {:ok, datetime, _} = DateTime.from_iso8601(@datetime)
+
+      assert DateTimeRenderer.datetime_to_time_string(datetime, "pl") == "3:25 PM"
+    end
+  end
+
+  describe "convert a datetime with a timezone" do
+    test "with an existing tz" do
+      {:ok, datetime, _} = DateTime.from_iso8601(@datetime)
+      converted_datetime = DateTimeRenderer.datetime_tz_convert(datetime, "Europe/Paris")
+
+      assert %DateTime{time_zone: "Europe/Paris", utc_offset: 3600} = converted_datetime
+      assert converted_datetime |> DateTime.to_unix() == datetime |> DateTime.to_unix()
+    end
+
+    test "with an non existing tz" do
+      {:ok, datetime, _} = DateTime.from_iso8601(@datetime)
+      converted_datetime = DateTimeRenderer.datetime_tz_convert(datetime, "Planet/Mars")
+
+      assert converted_datetime == datetime
+    end
+  end
+
+  describe "gets relative time to a datetime" do
+    test "standard time" do
+      then = DateTime.add(DateTime.utc_now(), 3600 * -5)
+      assert DateTimeRenderer.datetime_relative(then) == "5 hours ago"
+      assert DateTimeRenderer.datetime_relative(then, "fr") == "il y a 5 heures"
+    end
+
+    test "non existing or loaded locale fallbacks to english" do
+      then = DateTime.add(DateTime.utc_now(), 3600 * -4)
+
+      assert DateTimeRenderer.datetime_relative(then, "pl") == "4 hours ago"
+    end
+  end
+end

test/service/metadata/metadata_test.exs

@@ -6,6 +6,7 @@ defmodule Mobilizon.Service.MetadataTest do
   alias Mobilizon.Service.Metadata
   alias Mobilizon.Tombstone
   alias Mobilizon.Web.Endpoint
+  alias Mobilizon.Web.JsonLD.ObjectView
   alias Mobilizon.Web.Router.Helpers, as: Routes
   use Mobilizon.DataCase
   import Mobilizon.Factory
@@ -37,29 +38,81 @@ defmodule Mobilizon.Service.MetadataTest do
   end
 
   describe "build_tags/2 for an event" do
+    @long_description """
+    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer malesuada commodo nunc, dictum dignissim erat aliquet quis. Morbi iaculis scelerisque magna eu dapibus. Morbi ultricies mollis arcu, vel auctor enim dapibus ut. Cras tempus sapien eu lacus blandit suscipit. Fusce tincidunt fringilla velit non elementum. Etiam pretium venenatis placerat. Suspendisse interdum, justo efficitur faucibus commodo, dolor elit vehicula lacus, eu molestie nulla mi vel dolor. Nullam fringilla at lorem a gravida. Praesent viverra, ante eu porttitor rutrum, ex leo condimentum felis, vitae vestibulum neque turpis in nunc. Nullam aliquam rhoncus ornare. Suspendisse finibus finibus est sed eleifend. Nam a massa vestibulum, mollis lorem vel, placerat purus. Nam ex nunc, hendrerit ut lacinia ac, pellentesque eu est.</p>
+
+    <p>Fusce nec odio tellus. Aliquam at fermentum turpis, ut dictum tellus. Fusce ac nibh vehicula, imperdiet ipsum sit amet, pellentesque dui. Vivamus venenatis efficitur elementum. Quisque mattis dui ac faucibus mollis. Nullam ac malesuada nisi, vitae scelerisque nisi. Nulla placerat nunc non convallis sollicitudin. Donec sed pulvinar leo, quis tristique eros. Nulla pretium elit ante, consectetur aliquam sapien varius nec. Donec cursus, orci quis suscipit placerat, mi lectus convallis sem, et scelerisque urna libero nec sapien. Nam quis justo ante. Nulla placerat est nec suscipit euismod.</p>
+    """
+    @truncated_description "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer malesuada commodo nunc, dictum dignissim erat aliquet quis. Morbi iaculis scelerisque magna eu dapibus. Morbi ultricies mollis arcu, vel…"
+
     test "gives tags" do
-      alias Mobilizon.Web.Endpoint
+      %Event{} = event = insert(:event, description: @long_description)
 
-      %Event{} = event = insert(:event)
+      tags_output = event |> Metadata.build_tags() |> Metadata.Utils.stringify_tags()
+      {:ok, document} = Floki.parse_fragment(tags_output)
+      assert "#{event.title} - Mobilizon" == document |> Floki.find("title") |> Floki.text()
 
-      # Because the description in Schema.org data is double-escaped
-      a = "\n"
-      b = "\\n"
+      assert @truncated_description ==
+               document
+               |> Floki.find("meta[name=\"description\"]")
+               |> Floki.attribute("content")
+               |> hd
 
-      assert event
-             |> Metadata.build_tags()
-             |> Metadata.Utils.stringify_tags() ==
-               String.trim("""
-               <title>#{event.title} - Mobilizon</title><meta content="#{event.description}" name="description"><meta content="#{event.title}" property="og:title"><meta content="#{event.url}" property="og:url"><meta content="#{event.description}" property="og:description"><meta content="website" property="og:type"><link href="#{event.url}" rel="canonical"><meta content="#{event.picture.file.url}" property="og:image"><meta content="summary_large_image" property="twitter:card"><script type="application/ld+json">{"@context":"https://schema.org","@type":"Event","description":"#{String.replace(event.description, a, b)}","endDate":"#{DateTime.to_iso8601(event.ends_on)}","eventStatus":"https://schema.org/EventScheduled","image":["#{event.picture.file.url}"],"location":{"@type":"Place","address":{"@type":"PostalAddress","addressCountry":"My Country","addressLocality":"My Locality","addressRegion":"My Region","postalCode":"My Postal Code","streetAddress":"My Street Address"},"name":"#{event.physical_address.description}"},"name":"#{event.title}","organizer":{"@type":"Person","name":"#{event.organizer_actor.preferred_username}"},"performer":{"@type":"Person","name":"#{event.organizer_actor.preferred_username}"},"startDate":"#{DateTime.to_iso8601(event.begins_on)}"}</script>
-               """)
+      assert event.title ==
+               document
+               |> Floki.find("meta[property=\"og:title\"]")
+               |> Floki.attribute("content")
+               |> hd
 
-      assert event
-             |> Map.put(:picture, nil)
-             |> Metadata.build_tags()
-             |> Metadata.Utils.stringify_tags() ==
-               String.trim("""
-               <title>#{event.title} - Mobilizon</title><meta content="#{event.description}" name="description"><meta content="#{event.title}" property="og:title"><meta content="#{event.url}" property="og:url"><meta content="#{event.description}" property="og:description"><meta content="website" property="og:type"><link href="#{event.url}" rel="canonical"><meta content="summary_large_image" property="twitter:card"><script type="application/ld+json">{"@context":"https://schema.org","@type":"Event","description":"#{String.replace(event.description, a, b)}","endDate":"#{DateTime.to_iso8601(event.ends_on)}","eventStatus":"https://schema.org/EventScheduled","image":["#{"#{Endpoint.url()}/img/mobilizon_default_card.png"}"],"location":{"@type":"Place","address":{"@type":"PostalAddress","addressCountry":"My Country","addressLocality":"My Locality","addressRegion":"My Region","postalCode":"My Postal Code","streetAddress":"My Street Address"},"name":"#{event.physical_address.description}"},"name":"#{event.title}","organizer":{"@type":"Person","name":"#{event.organizer_actor.preferred_username}"},"performer":{"@type":"Person","name":"#{event.organizer_actor.preferred_username}"},"startDate":"#{DateTime.to_iso8601(event.begins_on)}"}</script>
-               """)
+      assert event.url ==
+               document
+               |> Floki.find("meta[property=\"og:url\"]")
+               |> Floki.attribute("content")
+               |> hd
+
+      assert document
+             |> Floki.find("meta[property=\"og:description\"]")
+             |> Floki.attribute("content")
+             |> hd =~ @truncated_description
+
+      assert "website" ==
+               document
+               |> Floki.find("meta[property=\"og:type\"]")
+               |> Floki.attribute("content")
+               |> hd
+
+      assert event.url ==
+               document
+               |> Floki.find("link[rel=\"canonical\"]")
+               |> Floki.attribute("href")
+               |> hd
+
+      assert event.picture.file.url ==
+               document
+               |> Floki.find("meta[property=\"og:image\"]")
+               |> Floki.attribute("content")
+               |> hd
+
+      assert "summary_large_image" ==
+               document
+               |> Floki.find("meta[property=\"twitter:card\"]")
+               |> Floki.attribute("content")
+               |> hd
+
+      assert "event.json" |> ObjectView.render(%{event: event}) |> Jason.encode!() ==
+               document
+               |> Floki.find("script[type=\"application/ld+json\"]")
+               |> Floki.text(js: true)
+
+      tags_output =
+        event
+        |> Map.put(:picture, nil)
+        |> Metadata.build_tags()
+        |> Metadata.Utils.stringify_tags()
+
+      {:ok, document} = Floki.parse_fragment(tags_output)
+
+      assert [] == Floki.find(document, "meta[property=\"og:image\"]")
     end
   end