hotfix: token balances in testnet

lib/starknet_explorer/token.ex

@@ -2,7 +2,7 @@ defmodule StarknetExplorer.Token do
   defstruct [:address, :name, :symbol]
   alias StarknetExplorer.Rpc
 
-  @whitelisted_tokens %{
+  @whitelisted_tokens_mainnet %{
     "0x049d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7" => %{
       address: "0x049d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7",
       name: "StarkGate: ETH",
@@ -40,16 +40,56 @@ defmodule StarknetExplorer.Token do
     }
   }
 
-  @whitelisted_token_addresses Map.keys(@whitelisted_tokens)
+  @whitelisted_tokens_testnet %{
+    "0x049d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7" => %{
+      address: "0x049d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7",
+      name: "StarkGate: ETH",
+      symbol: "ETH"
+    },
+    "0x03e85bfbb8e2a42b7bead9e88e9a1b19dbccf661471061807292120462396ec9" => %{
+      address: "0x03e85bfbb8e2a42b7bead9e88e9a1b19dbccf661471061807292120462396ec9",
+      name: "StarkGate: DAI",
+      symbol: "DAI"
+    },
+    "0x005a643907b9a4bc6a55e9069c4fd5fd1f5c79a22470690f75556c4736e34426" => %{
+      address: "0x005a643907b9a4bc6a55e9069c4fd5fd1f5c79a22470690f75556c4736e34426",
+      name: "StarkGate: USDC",
+      symbol: "USDC"
+    },
+    "0x0386e8d061177f19b3b485c20e31137e6f6bc497cc635ccdfcab96fadf5add6a" => %{
+      address: "0x0386e8d061177f19b3b485c20e31137e6f6bc497cc635ccdfcab96fadf5add6a",
+      name: "StarkGate: USDT",
+      symbol: "USDT"
+    },
+    "0x012d537dc323c439dc65c976fad242d5610d27cfb5f31689a0a319b8be7f3d56" => %{
+      address: "0x012d537dc323c439dc65c976fad242d5610d27cfb5f31689a0a319b8be7f3d56",
+      name: "StarkGate: wBTC",
+      symbol: "WBTC"
+    },
+    "0x002133188109385fedaac0b1bf9de1134e271b88efcd21e2ea0dac460639fbe2" => %{
+      address: "0x002133188109385fedaac0b1bf9de1134e271b88efcd21e2ea0dac460639fbe2",
+      name: "StarkGate: rETH",
+      symbol: "rETH"
+    }
+  }
 
   # starknet_keccak("balanceOf")
   @balanceOf_selector "0x2e4263afad30923c891518314c3c95dbe830a16874e8abc5777a9a20b54c76e"
 
-  def contract_portfolio(address, network) do
-    @whitelisted_token_addresses
+  def contract_portfolio(address, :mainnet),
+    do: fetch_portfolio(address, :mainnet, @whitelisted_tokens_mainnet)
+
+  def contract_portfolio(address, :testnet),
+    do: fetch_portfolio(address, :testnet, @whitelisted_tokens_testnet)
+
+  def contract_portfolio(_, _), do: []
+
+  defp fetch_portfolio(address, network, tokens) do
+    tokens
+    |> Map.keys()
     |> Enum.map(fn token_address ->
       {:ok, [balance_in_wei, _]} = token_balance(token_address, address, network)
-      {@whitelisted_tokens[token_address], balance_in_wei}
+      {tokens[token_address], balance_in_wei}
     end)
     |> Enum.filter(fn {_, balance_in_wei} -> balance_in_wei != "0x0" end)
   end