Add QR code library and address QR code controller

apps/explorer_web/lib/explorer_web/controllers/address_qr_code_controller.ex

@@ -0,0 +1,7 @@
+defmodule ExplorerWeb.AddressQRCodeController do
+  use ExplorerWeb, :controller
+
+  def index(conn, %{"address_id" => id}) do
+    send_download(conn, {:binary, QRCode.to_png(id)}, "content-type": "image/png", filename: "#{id}.png")
+  end
+end

apps/explorer_web/lib/explorer_web/router.ex

@@ -80,6 +80,8 @@ defmodule ExplorerWeb.Router do
         only: [:index],
         as: :contract
       )
+
+      resources("/qrcode", AddressQRCodeController, only: [:index], as: :qr_code)
     end
 
     get("/search", ChainController, :search)

apps/explorer_web/lib/explorer_web/templates/address/overview.html.eex

@@ -69,7 +69,7 @@
             <button class="btn btn-primary" data-clipboard-text="<%= @address %>">Copy</button>
           </div>
         </div>
-        <img src="http://via.placeholder.com/300x300" alt="qr_code">
+        <%= img_tag(address_qr_code_path(@conn, :index, @conn.assigns.locale, @address), alt: "qr_code") %>
       </div>
       <div class="modal-footer">
         <button type="button" class="btn btn-primary" data-dismiss="modal">Close</button>

apps/explorer_web/mix.exs

@@ -94,7 +94,8 @@ defmodule ExplorerWeb.Mixfile do
       {:sobelow, ">= 0.0.0", only: [:dev, :test], runtime: false},
       {:timex, "~> 3.1.24"},
       {:timex_ecto, "~> 3.2.1"},
-      {:wallaby, "~> 0.20", only: [:test], runtime: false}
+      {:wallaby, "~> 0.20", only: [:test], runtime: false},
+      {:qrcode, "~> 0.1.0"}
     ]
   end
 

mix.lock

@@ -58,6 +58,7 @@
   "poison": {:hex, :poison, "3.1.0", "d9eb636610e096f86f25d9a46f35a9facac35609a7591b3be3326e99a0484665", [:mix], [], "hexpm"},
   "poolboy": {:hex, :poolboy, "1.5.1", "6b46163901cfd0a1b43d692657ed9d7e599853b3b21b95ae5ae0a777cf9b6ca8", [:rebar], [], "hexpm"},
   "postgrex": {:hex, :postgrex, "0.13.5", "3d931aba29363e1443da167a4b12f06dcd171103c424de15e5f3fc2ba3e6d9c5", [:mix], [{:connection, "~> 1.0", [hex: :connection, repo: "hexpm", optional: false]}, {:db_connection, "~> 1.1", [hex: :db_connection, repo: "hexpm", optional: false]}, {:decimal, "~> 1.0", [hex: :decimal, repo: "hexpm", optional: false]}], "hexpm"},
+  "qrcode": {:hex, :qrcode, "0.1.1", "9ca0d512a3c69a07d28e7660b046f8f3d835ef5462063814a7639a27302f7213", [:mix], [], "hexpm"},
   "ranch": {:hex, :ranch, "1.3.2", "e4965a144dc9fbe70e5c077c65e73c57165416a901bd02ea899cfd95aa890986", [:rebar3], [], "hexpm"},
   "redix": {:hex, :redix, "0.6.1", "20986b0e02f02b13e6f53c79a1ae70aa83147488c408f40275ec261f5bb0a6d0", [:mix], [{:connection, "~> 1.0", [hex: :connection, repo: "hexpm", optional: false]}], "hexpm"},
   "redix_pubsub": {:hex, :redix_pubsub, "0.4.1", "26e6a69129072ac2226be49139019bdf951bb1e9e210a773c1372acf88100936", [:mix], [{:connection, "~> 1.0", [hex: :connection, repo: "hexpm", optional: false]}, {:redix, "~> 0.6.0", [hex: :redix, repo: "hexpm", optional: false]}], "hexpm"},