Introduce avatar and banner and fetch Gravatar to fill avatar during registration

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

typo

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

Rename avatar to avatar_url, same with header.

Add a comment to explain why the tweak with HTTPoison and TLS1.2

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

Rename avatar to avatar_url

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

rename old avatar properties in front-end to avatar_url

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

fix change gravatar from ?d= to ?default=

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

reorganize aliases and imports

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

set avatar url only when gravatar exists, add a test for that case

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

lib/eventos/accounts/accounts.ex

@@ -4,8 +4,9 @@ defmodule Eventos.Accounts do
   """
 
   import Ecto.Query, warn: false
-  alias Eventos.Repo
+  import Exgravatar
 
+  alias Eventos.Repo
   alias Eventos.Accounts.Account
 
   @doc """
@@ -173,6 +174,19 @@ defmodule Eventos.Accounts do
     end
   end
 
+  @doc """
+  Fetch gravatar url for email and set it as avatar if it exists
+  """
+  defp gravatar(email) do
+    url = gravatar_url(email, default: "404")
+    case HTTPoison.get(url, [], [ssl: [{:versions, [:'tlsv1.2']}]]) do # See https://github.com/edgurgel/httpoison#note-about-broken-ssl-in-erlang-19
+      {:ok, %HTTPoison.Response{status_code: 200}} ->
+        url
+      _ -> # User doesn't have a gravatar email, or other issues
+        nil
+    end
+  end
+
   @doc """
   Register user
   """
@@ -180,13 +194,15 @@ defmodule Eventos.Accounts do
     {:ok, {privkey, pubkey}} = RsaEx.generate_keypair("4096")
 
 
+    avatar = gravatar(email)
     account = Eventos.Accounts.Account.registration_changeset(%Eventos.Accounts.Account{}, %{
       username: username,
       domain: nil,
       private_key: privkey,
       public_key: pubkey,
       uri: "h",
-      url: "h"
+      url: "h",
+      avatar_url: avatar,
     })
 
     user = Eventos.Accounts.User.registration_changeset(%Eventos.Accounts.User{}, %{
@@ -207,7 +223,6 @@ defmodule Eventos.Accounts do
     end
   end
 
-
   @doc """
   Creates a user.