Escape SFTP passwords correctly (#6)

This commit changes how we handle the SFTP URI. Currently we don't
escape anything, and that might lead to failures. What this commit does
is use java.net.URI class and it's uri-escaping-properties to mitigate
this possibility, and fix this issue.

src/main/kotlin/br/com/guiabolso/sftptos3connector/internal/sftp/SftpFileStreamer.kt

@@ -18,15 +18,16 @@ package br.com.guiabolso.sftptos3connector.internal.sftp
 
 import br.com.guiabolso.sftptos3connector.config.SftpConfig
 import org.apache.commons.vfs2.VFS
+import java.net.URI
 
 internal class SftpFileStreamer(sftpConfig: SftpConfig) {
-    private val baseConnectionURI = sftpConfig.run { "sftp://$username:$password@$host:$port" }
+    private val baseConnectionURI = sftpConfig.run { URI("sftp", "$username:$password", host, port, null, null, null) }
     private val fileSystemManager = VFS.getManager()
-    
+
     fun getSftpFile(filePath: String): SftpFile {
         return getInputStreamWithContentLength(filePath)
     }
-    
+
     private fun getInputStreamWithContentLength(filePath: String): SftpFile {
         val remoteFile = fileSystemManager.resolveFile("$baseConnectionURI/$filePath")
         return SftpFile(remoteFile.content.inputStream, remoteFile.content.size)

src/test/kotlin/br/com/guiabolso/sftptos3connector/internal/sftp/SftpFileStreamerTest.kt

@@ -41,4 +41,12 @@ class SftpFileStreamerTest : FunSpec({
             fileInfo.contentLength shouldBe sftpFileContent.encodeToByteArray().size.toLong()
         }
     }
+
+    test("Escape uri characters") {
+        withConfiguredSftpServer("unsafe%%,,..&") { server ->
+            val target = SftpFileStreamer(SftpConfig("localhost", server.port, sftpUsername, "unsafe%%,,..&"))
+
+            target.getSftpFile(sftpFilePath)
+        }
+    }
 })

src/test/kotlin/br/com/guiabolso/sftptos3connector/internal/sftp/SftpServer.kt

@@ -25,10 +25,13 @@ val sftpFilePath = "path/to/file"
 val sftpFileContent = "FileContent\nMoreContent"
 
 
-fun withConfiguredSftpServer(block: (FakeSftpServer) -> Unit) = FakeSftpServer.withSftpServer { server ->
+fun withConfiguredSftpServer(
+    password: String = sftpPassword,
+    block: (FakeSftpServer) -> Unit
+) = FakeSftpServer.withSftpServer { server ->
     server.port = obtainRandomAvailablePort()
     server.putFile(sftpFilePath, sftpFileContent, Charsets.UTF_8)
-    server.addUser(sftpUsername, sftpPassword)
+    server.addUser(sftpUsername, password)
     block(server)
 }