Merge pull request #1467 from davotoula/prevent-resource-leaks-with-streams

Prevent resource leaks with streams

quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip03Timestamp/ots/http/Request.kt

@@ -50,8 +50,8 @@ class Request(
 
         try {
             val httpURLConnection = url.openConnection() as HttpURLConnection
-            httpURLConnection.setReadTimeout(10000)
-            httpURLConnection.setConnectTimeout(10000)
+            httpURLConnection.readTimeout = 10000
+            httpURLConnection.connectTimeout = 10000
             httpURLConnection.setRequestProperty("User-Agent", "OpenTimestamps Java")
             httpURLConnection.setRequestProperty("Accept", "application/json")
             httpURLConnection.setRequestProperty("Accept-Encoding", "gzip")
@@ -62,17 +62,17 @@ class Request(
 
             if (data != null) {
                 httpURLConnection.setDoOutput(true)
-                httpURLConnection.setRequestMethod("POST")
+                httpURLConnection.requestMethod = "POST"
                 httpURLConnection.setRequestProperty(
                     "Content-Length",
                     "" + this.data!!.size.toString(),
                 )
-                val wr = DataOutputStream(httpURLConnection.getOutputStream())
-                wr.write(this.data, 0, this.data!!.size)
-                wr.flush()
-                wr.close()
+                DataOutputStream(httpURLConnection.getOutputStream()).use { wr ->
+                    wr.write(this.data, 0, this.data!!.size)
+                    wr.flush()
+                }
             } else {
-                httpURLConnection.setRequestMethod("GET")
+                httpURLConnection.requestMethod = "GET"
             }
 
             httpURLConnection.connect()
@@ -84,7 +84,7 @@ class Request(
             response.status = responseCode
             response.fromUrl = url.toString()
             var `is` = httpURLConnection.getInputStream()
-            if ("gzip" == httpURLConnection.getContentEncoding()) {
+            if ("gzip" == httpURLConnection.contentEncoding) {
                 `is` = GZIPInputStream(`is`)
             }
             response.setStream(`is`)

quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip03Timestamp/ots/http/Response.kt

@@ -23,6 +23,7 @@ package com.vitorpamplona.quartz.nip03Timestamp.ots.http
 import com.fasterxml.jackson.databind.JsonNode
 import com.fasterxml.jackson.databind.json.JsonMapper
 import java.io.ByteArrayOutputStream
+import java.io.Closeable
 import java.io.IOException
 import java.io.InputStream
 import java.nio.charset.StandardCharsets
@@ -30,7 +31,7 @@ import java.nio.charset.StandardCharsets
 /**
  * Holds the response from an HTTP request.
  */
-class Response {
+class Response : Closeable {
     private var stream: InputStream? = null
 
     var fromUrl: String? = null
@@ -53,7 +54,7 @@ class Response {
 
     @get:Throws(IOException::class)
     val string: String
-        get() = kotlin.text.String(this.bytes, StandardCharsets.UTF_8)
+        get() = String(this.bytes, StandardCharsets.UTF_8)
 
     @get:Throws(IOException::class)
     val bytes: ByteArray
@@ -79,4 +80,9 @@ class Response {
                 JsonMapper.builder().build()
             return builder.readTree(jsonString)
         }
+
+    override fun close() {
+        stream?.close()
+        stream = null
+    }
 }

quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip03Timestamp/ots/op/OpCrypto.kt

@@ -62,7 +62,7 @@ abstract class OpCrypto internal constructor() : OpUnary() {
         val digest = MessageDigest.getInstance(this.hashLibName())
         var chunk = ctx.read(1048576)
 
-        while (chunk != null && chunk.size > 0) {
+        while (chunk.isNotEmpty()) {
             digest.update(chunk)
             chunk = ctx.read(1048576)
         }
@@ -73,7 +73,7 @@ abstract class OpCrypto internal constructor() : OpUnary() {
     }
 
     @Throws(IOException::class, NoSuchAlgorithmException::class)
-    fun hashFd(file: File?): ByteArray = hashFd(FileInputStream(file))
+    fun hashFd(file: File?): ByteArray = FileInputStream(file).use { inputStream -> hashFd(inputStream) }
 
     @Throws(IOException::class, NoSuchAlgorithmException::class)
     fun hashFd(bytes: ByteArray): ByteArray {
@@ -93,6 +93,7 @@ abstract class OpCrypto internal constructor() : OpUnary() {
             count = inputStream.read(chunk, 0, 1048576)
         }
 
+        // TODO: Is this needed? Closing of stream should be callers responsibility?
         inputStream.close()
         val hash = digest.digest()