From 98f083dc9a11ca4f29db2590ca0045804766d215 Mon Sep 17 00:00:00 2001
From: Marcin Jakuszko <137152553+mjakuszko-punks@users.noreply.github.com>
Date: Mon, 6 Jan 2025 21:54:36 +0100
Subject: [PATCH] feat: Add configuration parameter for request body size
 (#1565)

---
 README.md                                 | 1 +
 src/App.ts                                | 3 +--
 src/SidecarConfig.ts                      | 1 +
 src/Specs.ts                              | 8 ++++++++
 src/main.ts                               | 2 +-
 src/types/sidecar-config/CONFIG.ts        | 1 +
 src/types/sidecar-config/SidecarConfig.ts | 1 +
 7 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index dcbc2e815..28634e4d2 100644
--- a/README.md
+++ b/README.md
@@ -164,6 +164,7 @@ For more information on our configuration manager visit its readme [here](https:
 - `SAS_EXPRESS_BIND_HOST`: address on which the server will be listening, defaults to `127.0.0.1`.
 - `SAS_EXPRESS_PORT`: port on which the server will be listening, defaults to `8080`.
 - `SAS_EXPRESS_KEEP_ALIVE_TIMEOUT`: Set the `keepAliveTimeout` in express.
+- `SAS_EXPRESS_MAX_BODY`: Set the size of request body payload, defaults to `100kb`
 
 ### Substrate node
 
diff --git a/src/App.ts b/src/App.ts
index 32f540fd9..f80c2abbe 100644
--- a/src/App.ts
+++ b/src/App.ts
@@ -14,8 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-import express from 'express';
-import { Application, ErrorRequestHandler, Request, RequestHandler, Response } from 'express';
+import express, { Application, ErrorRequestHandler, Request, RequestHandler, Response } from 'express';
 import { Server } from 'http';
 
 import packageJson from '../package.json';
diff --git a/src/SidecarConfig.ts b/src/SidecarConfig.ts
index 25374fa7d..c22aa6c52 100644
--- a/src/SidecarConfig.ts
+++ b/src/SidecarConfig.ts
@@ -54,6 +54,7 @@ export class SidecarConfig {
 				HOST: config.Get(MODULES.EXPRESS, CONFIG.BIND_HOST) as string,
 				PORT: config.Get(MODULES.EXPRESS, CONFIG.PORT) as number,
 				KEEP_ALIVE_TIMEOUT: config.Get(MODULES.EXPRESS, CONFIG.KEEP_ALIVE_TIMEOUT) as number,
+				MAX_BODY: config.Get(MODULES.EXPRESS, CONFIG.MAX_BODY) as string,
 			},
 			SUBSTRATE: {
 				URL: config.Get(MODULES.SUBSTRATE, CONFIG.URL) as string,
diff --git a/src/Specs.ts b/src/Specs.ts
index 8e057b20b..21d054ce7 100644
--- a/src/Specs.ts
+++ b/src/Specs.ts
@@ -87,6 +87,14 @@ export class Specs {
 				type: 'number',
 			}),
 		);
+
+		this._specs.appendSpec(
+			MODULES.EXPRESS,
+			this._specs.getSpec(CONFIG.MAX_BODY, 'Max size of request payload body. It will default to 100kb.', {
+				default: '100kb',
+				type: 'string',
+			}),
+		);
 	}
 
 	/**
diff --git a/src/main.ts b/src/main.ts
index 9a80334dc..f2253f5a6 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -65,7 +65,7 @@ async function main() {
 
 	startUpPrompt(config.SUBSTRATE.URL, chainName.toString(), implName.toString());
 
-	const preMiddlewares = [json(), middleware.httpLoggerCreate(logger)];
+	const preMiddlewares = [json({ limit: config.EXPRESS.MAX_BODY }), middleware.httpLoggerCreate(logger)];
 
 	if (config.METRICS.ENABLED) {
 		// Create Metrics App
diff --git a/src/types/sidecar-config/CONFIG.ts b/src/types/sidecar-config/CONFIG.ts
index fe5f0bc6a..8e197a214 100644
--- a/src/types/sidecar-config/CONFIG.ts
+++ b/src/types/sidecar-config/CONFIG.ts
@@ -41,4 +41,5 @@ export enum CONFIG {
 	PROM_HOST = 'PROM_HOST',
 	LOKI_PORT = 'LOKI_PORT',
 	INCLUDE_QUERYPARAMS = 'INCLUDE_QUERYPARAMS',
+	MAX_BODY = 'MAX_BODY',
 }
diff --git a/src/types/sidecar-config/SidecarConfig.ts b/src/types/sidecar-config/SidecarConfig.ts
index 3c13f4f21..c1693f5b3 100644
--- a/src/types/sidecar-config/SidecarConfig.ts
+++ b/src/types/sidecar-config/SidecarConfig.ts
@@ -37,6 +37,7 @@ interface ISidecarConfigExpress {
 	HOST: string;
 	PORT: number;
 	KEEP_ALIVE_TIMEOUT: number;
+	MAX_BODY: string;
 }
 
 interface ISidecarConfigLog {