Set body-parser size limits to 10MB (#1386)

changelog.txt

@@ -3,4 +3,5 @@
 * Fixes bug in Firestore emulator where property paths with special characters would cause errors due to ClassNotFound exceptions.
 * Fixes bug in Firestore emulator where auto-id allocation only worked once per collection.
 * Adds REST API to Firestore emulator for setting security rules.
-* Fixes bug where `firebase emulators:exec` would succeed even if the script failed.
+* Functions emulator now limits request sizes to 10MB.
+* Fixes bug where `firebase emulators:exec` would succeed even if the script failed.

src/emulator/functionsEmulatorRuntime.ts

@@ -545,10 +545,28 @@ async function ProcessHTTPS(frb: FunctionsRuntimeBundle, trigger: EmulatedTrigge
     };
 
     ephemeralServer.enable("trust proxy");
-    ephemeralServer.use(bodyParser.json({}));
-    ephemeralServer.use(bodyParser.text({}));
-    ephemeralServer.use(bodyParser.urlencoded({ extended: true }));
-    ephemeralServer.use(bodyParser.raw({ type: "*/*" }));
+    ephemeralServer.use(
+      bodyParser.json({
+        limit: "10mb",
+      })
+    );
+    ephemeralServer.use(
+      bodyParser.text({
+        limit: "10mb",
+      })
+    );
+    ephemeralServer.use(
+      bodyParser.urlencoded({
+        extended: true,
+        limit: "10mb",
+      })
+    );
+    ephemeralServer.use(
+      bodyParser.raw({
+        type: "*/*",
+        limit: "10mb",
+      })
+    );
 
     ephemeralServer.all("/*", handler);