feat: Add rate limits to graphQL API (#9771)

* feat: Add rate limits to graphQL API

* Fix tests

* Process review comments

* Update common-blockscout.env

.github/workflows/config.yml

@@ -743,6 +743,7 @@ jobs:
           ETHEREUM_JSONRPC_WEB_SOCKET_CASE: "EthereumJSONRPC.WebSocket.Case.Mox"
           CHAIN_ID: "10200"
           API_RATE_LIMIT_DISABLED: "true"
+          API_GRAPHQL_RATE_LIMIT_DISABLED: "true"
           ADMIN_PANEL_ENABLED: "true"
           ACCOUNT_ENABLED: "true"
           ACCOUNT_REDIS_URL: "redis://localhost:6379"

apps/block_scout_web/lib/block_scout_web/api_router.ex

@@ -47,6 +47,12 @@ defmodule BlockScoutWeb.ApiRouter do
     plug(RateLimit)
   end
 
+  pipeline :api_v1_graphql do
+    plug(BlockScoutWeb.Plug.Logger, application: :api)
+    plug(:accepts, ["json"])
+    plug(RateLimit, graphql?: true)
+  end
+
   alias BlockScoutWeb.Account.Api.V2.{AuthenticateController, EmailController, TagsController, UserController}
   alias BlockScoutWeb.API.V2
 
@@ -336,23 +342,27 @@ defmodule BlockScoutWeb.ApiRouter do
     end
   end
 
-  scope "/v1", as: :api_v1 do
-    pipe_through(:api)
-    alias BlockScoutWeb.API.{EthRPC, RPC, V1}
-    alias BlockScoutWeb.API.V1.{GasPriceOracleController, HealthController}
-    alias BlockScoutWeb.API.V2.SearchController
-
-    # leave the same endpoint in v1 in order to keep backward compatibility
-    get("/search", SearchController, :search)
+  scope "/v1/graphql" do
+    pipe_through(:api_v1_graphql)
 
     if Application.compile_env(:block_scout_web, Api.GraphQL)[:enabled] do
-      forward("/graphql", Absinthe.Plug,
+      forward("/", Absinthe.Plug,
         schema: BlockScoutWeb.GraphQL.Schema,
         analyze_complexity: true,
         max_complexity: Application.compile_env(:block_scout_web, Api.GraphQL)[:max_complexity],
         token_limit: Application.compile_env(:block_scout_web, Api.GraphQL)[:token_limit]
       )
     end
+  end
+
+  scope "/v1", as: :api_v1 do
+    pipe_through(:api)
+    alias BlockScoutWeb.API.{EthRPC, RPC, V1}
+    alias BlockScoutWeb.API.V1.{GasPriceOracleController, HealthController}
+    alias BlockScoutWeb.API.V2.SearchController
+
+    # leave the same endpoint in v1 in order to keep backward compatibility
+    get("/search", SearchController, :search)
 
     get("/transactions-csv", AddressTransactionController, :transactions_csv)
 

apps/block_scout_web/lib/block_scout_web/plug/rate_limit.ex

@@ -6,6 +6,19 @@ defmodule BlockScoutWeb.Plug.RateLimit do
 
   def init(opts), do: opts
 
+  def call(conn, graphql?: true) do
+    case AccessHelper.check_rate_limit(conn, graphql?: true) do
+      :ok ->
+        conn
+
+      true ->
+        conn
+
+      _ ->
+        AccessHelper.handle_rate_limit_deny(conn, true)
+    end
+  end
+
   def call(conn, _opts) do
     case AccessHelper.check_rate_limit(conn) do
       :ok ->

apps/block_scout_web/lib/block_scout_web/router.ex

@@ -1,7 +1,7 @@
 defmodule BlockScoutWeb.Router do
   use BlockScoutWeb, :router
 
-  alias BlockScoutWeb.Plug.GraphQL
+  alias BlockScoutWeb.Plug.{GraphQL, RateLimit}
   alias BlockScoutWeb.{ApiRouter, WebRouter}
 
   if Application.compile_env(:block_scout_web, :admin_panel_enabled) do
@@ -22,16 +22,26 @@ defmodule BlockScoutWeb.Router do
     plug(:accepts, ["json"])
   end
 
+  pipeline :api_v1_graphql do
+    plug(BlockScoutWeb.Plug.Logger, application: :api)
+    plug(:accepts, ["json"])
+    plug(RateLimit, graphql?: true)
+  end
+
   forward("/api", ApiRouter)
 
-  if Application.compile_env(:block_scout_web, Api.GraphQL)[:enabled] &&
-       Application.compile_env(:block_scout_web, ApiRouter)[:reading_enabled] do
-    forward("/graphiql", Absinthe.Plug.GraphiQL,
-      schema: BlockScoutWeb.GraphQL.Schema,
-      interface: :advanced,
-      default_query: GraphQL.default_query(),
-      socket: BlockScoutWeb.UserSocket
-    )
+  scope "/graphiql" do
+    pipe_through(:api_v1_graphql)
+
+    if Application.compile_env(:block_scout_web, Api.GraphQL)[:enabled] &&
+         Application.compile_env(:block_scout_web, ApiRouter)[:reading_enabled] do
+      forward("/", Absinthe.Plug.GraphiQL,
+        schema: BlockScoutWeb.GraphQL.Schema,
+        interface: :advanced,
+        default_query: GraphQL.default_query(),
+        socket: BlockScoutWeb.UserSocket
+      )
+    end
   end
 
   scope "/", BlockScoutWeb do

apps/block_scout_web/lib/block_scout_web/views/access_helper.ex

@@ -53,6 +53,42 @@ defmodule BlockScoutWeb.AccessHelper do
     |> Conn.halt()
   end
 
+  def check_rate_limit(conn, graphql?: true) do
+    rate_limit_config = Application.get_env(:block_scout_web, Api.GraphQL)
+
+    if rate_limit_config[:rate_limit_disabled?] do
+      :ok
+    else
+      check_graphql_rate_limit_inner(conn, rate_limit_config)
+    end
+  end
+
+  defp check_graphql_rate_limit_inner(conn, rate_limit_config) do
+    global_limit = rate_limit_config[:global_limit]
+    limit_by_key = rate_limit_config[:limit_by_key]
+    time_interval_limit = rate_limit_config[:time_interval_limit]
+    static_api_key = rate_limit_config[:static_api_key]
+    limit_by_ip = rate_limit_config[:limit_by_ip]
+    time_interval_by_ip = rate_limit_config[:time_interval_limit_by_ip]
+
+    ip_string = conn_to_ip_string(conn)
+    plan = get_plan(conn.query_params)
+
+    cond do
+      check_api_key(conn) && get_api_key(conn) == static_api_key ->
+        rate_limit(static_api_key, limit_by_key, time_interval_limit)
+
+      check_api_key(conn) && !is_nil(plan) ->
+        conn
+        |> get_api_key()
+        |> rate_limit(min(plan.max_req_per_second, limit_by_key), time_interval_limit)
+
+      true ->
+        rate_limit("graphql_#{ip_string}", limit_by_ip, time_interval_by_ip) == :ok &&
+          rate_limit("graphql", global_limit, time_interval_limit) == :ok
+    end
+  end
+
   def check_rate_limit(conn) do
     rate_limit_config = Application.get_env(:block_scout_web, :api_rate_limit)
 

config/runtime.exs

@@ -107,6 +107,8 @@ config :block_scout_web, :api_rate_limit,
   api_v2_token_ttl_seconds: ConfigHelper.parse_integer_env_var("API_RATE_LIMIT_UI_V2_TOKEN_TTL_IN_SECONDS", 18000),
   eth_json_rpc_max_batch_size: ConfigHelper.parse_integer_env_var("ETH_JSON_RPC_MAX_BATCH_SIZE", 5)
 
+default_graphql_rate_limit = 10
+
 config :block_scout_web, Api.GraphQL,
   default_transaction_hash:
     System.get_env(
@@ -116,7 +118,14 @@ config :block_scout_web, Api.GraphQL,
   enabled: ConfigHelper.parse_bool_env_var("API_GRAPHQL_ENABLED", "true"),
   token_limit: ConfigHelper.parse_integer_env_var("API_GRAPHQL_TOKEN_LIMIT", 1000),
   # Needs to be 215 to support the schema introspection for graphiql
-  max_complexity: ConfigHelper.parse_integer_env_var("API_GRAPHQL_MAX_COMPLEXITY", 215)
+  max_complexity: ConfigHelper.parse_integer_env_var("API_GRAPHQL_MAX_COMPLEXITY", 215),
+  rate_limit_disabled?: ConfigHelper.parse_bool_env_var("API_GRAPHQL_RATE_LIMIT_DISABLED"),
+  global_limit: ConfigHelper.parse_integer_env_var("API_GRAPHQL_RATE_LIMIT", default_graphql_rate_limit),
+  limit_by_key: ConfigHelper.parse_integer_env_var("API_GRAPHQL_RATE_LIMIT_BY_KEY", default_graphql_rate_limit),
+  time_interval_limit: ConfigHelper.parse_time_env_var("API_GRAPHQL_RATE_LIMIT_TIME_INTERVAL", "1s"),
+  limit_by_ip: ConfigHelper.parse_integer_env_var("API_GRAPHQL_RATE_LIMIT_BY_IP", 500),
+  time_interval_limit_by_ip: ConfigHelper.parse_time_env_var("API_GRAPHQL_RATE_LIMIT_BY_IP_TIME_INTERVAL", "5m"),
+  static_api_key: System.get_env("API_GRAPHQL_RATE_LIMIT_STATIC_API_KEY")
 
 # Configures History
 price_chart_config =

docker-compose/envs/common-blockscout.env

@@ -67,7 +67,6 @@ HEART_BEAT_TIMEOUT=30
 # BLOCKSCOUT_VERSION=
 RELEASE_LINK=
 BLOCK_TRANSFORMER=base
-# GRAPHIQL_TRANSACTION=
 # BLOCK_RANGES=
 # FIRST_BLOCK=
 # LAST_BLOCK=
@@ -126,6 +125,17 @@ API_RATE_LIMIT_WHITELISTED_IPS=
 API_RATE_LIMIT_STATIC_API_KEY=
 API_RATE_LIMIT_UI_V2_WITH_TOKEN=5
 API_RATE_LIMIT_BY_IP=3000
+# API_GRAPHQL_ENABLED=
+# API_GRAPHQL_MAX_COMPLEXITY=
+# API_GRAPHQL_TOKEN_LIMIT=
+# API_GRAPHQL_DEFAULT_TRANSACTION_HASH=
+# API_GRAPHQL_RATE_LIMIT_DISABLED=
+# API_GRAPHQL_RATE_LIMIT=
+# API_GRAPHQL_RATE_LIMIT_BY_KEY=
+# API_GRAPHQL_RATE_LIMIT_TIME_INTERVAL=
+# API_GRAPHQL_RATE_LIMIT_BY_IP=
+# API_GRAPHQL_RATE_LIMIT_BY_IP_TIME_INTERVAL=
+# API_GRAPHQL_RATE_LIMIT_STATIC_API_KEY=
 DISABLE_INDEXER=false
 DISABLE_REALTIME_INDEXER=false
 DISABLE_CATCHUP_INDEXER=false