add token transfers csv endpoint

apps/block_scout_web/lib/block_scout_web/controllers/address_transaction_controller.ex

@@ -10,6 +10,7 @@ defmodule BlockScoutWeb.AddressTransactionController do
 
   alias BlockScoutWeb.TransactionView
   alias Explorer.{Chain, Market}
+  alias Explorer.Chain.AddressTokenTransferCsvExporter
   alias Explorer.ExchangeRates.Token
   alias Indexer.Fetcher.CoinBalanceOnDemand
   alias Phoenix.View
@@ -106,4 +107,24 @@ defmodule BlockScoutWeb.AddressTransactionController do
         not_found(conn)
     end
   end
+
+  def token_transfers_csv(conn, %{"address_id" => address_hash_string}) do
+    with {:ok, address_hash} <- Chain.string_to_address_hash(address_hash_string),
+         {:ok, address} <- Chain.hash_to_address(address_hash) do
+      address
+      |> AddressTokenTransferCsvExporter.export()
+      |> Enum.into(
+        conn
+        |> put_resp_content_type("application/csv")
+        |> put_resp_header("content-disposition", "attachment; filename=transactions.csv")
+        |> send_chunked(200)
+      )
+    else
+      :error ->
+        unprocessable_entity(conn)
+
+      {:error, :not_found} ->
+        not_found(conn)
+    end
+  end
 end

apps/block_scout_web/lib/block_scout_web/router.ex

@@ -244,6 +244,8 @@ defmodule BlockScoutWeb.Router do
 
     get("/token_autocomplete", ChainController, :token_autocomplete)
 
+    get("/token_transfers_csv", AddressTransactionController, :token_transfers_csv)
+
     get("/chain_blocks", ChainController, :chain_blocks, as: :chain_blocks)
 
     get("/api_docs", APIDocsController, :index)

apps/block_scout_web/test/block_scout_web/controllers/address_transaction_controller_test.exs

@@ -132,4 +132,22 @@ defmodule BlockScoutWeb.AddressTransactionControllerTest do
              end)
     end
   end
+
+  describe "GET token_transfers_csv/2" do
+    test "exports token transfers to csv", %{conn: conn} do
+      address = insert(:address)
+
+      transaction =
+        :transaction
+        |> insert(from_address: address)
+        |> with_block()
+
+      insert(:token_transfer, transaction: transaction, from_address: address)
+      insert(:token_transfer, transaction: transaction, to_address: address)
+
+      conn = get(conn, "/token_transfers_csv", %{"address_id" => to_string(address.hash)})
+
+      assert conn.resp_body |> String.split("\n") |> Enum.count() == 4
+    end
+  end
 end