KTOR-6851 Parsing Content-Length to Long instead of Int to prevent Nu… (

#4008)

* KTOR-6851 Parse Content-Length to Long instead of Int to prevent NumberFormatException for lengths more than Int.MAX_VALUE

(cherry picked from commit 5513dcf)

ktor-server/ktor-server-cio/jvmAndNix/src/io/ktor/server/cio/CIOApplicationEngine.kt

@@ -151,7 +151,7 @@ public class CIOApplicationEngine(
     }
 
     private fun hasBody(request: CIOApplicationRequest): Boolean {
-        val contentLength = request.headers[HttpHeaders.ContentLength]?.toInt()
+        val contentLength = request.headers[HttpHeaders.ContentLength]?.toLong()
         val transferEncoding = request.headers[HttpHeaders.TransferEncoding]
         return transferEncoding != null || (contentLength != null && contentLength > 0)
     }

ktor-server/ktor-server-test-suites/jvm/src/io/ktor/server/testing/suites/ContentTestSuite.kt

@@ -744,4 +744,29 @@ abstract class ContentTestSuite<TEngine : ApplicationEngine, TConfiguration : Ap
             assertEquals("Hello", bodyAsText())
         }
     }
+
+    @Test
+    fun testReceivingBodyWithContentLengthMoreThanMaxInt() {
+        createAndStartServer {
+            post("/") {
+                call.receiveChannel()
+                call.respondText { "OK" }
+            }
+        }
+
+        withUrl(
+            "/",
+            {
+                method = HttpMethod.Post
+                headers.append("Content-Length", (Int.MAX_VALUE.toLong() + 1).toString())
+            }
+        ) {
+            assertEquals(200, status.value)
+            assertEquals("OK", bodyAsText())
+        }
+    }
+
+    companion object {
+        const val classesDir: String = "build/classes/"
+    }
 }