Prepare for improve of input validation

We now check application and config files before starting provisioning
process. We also check serverType and target validity before starting.
This happens in unified manner in the main function.

src/main/kotlin/org/domaindrivenarchitecture/provs/server/application/Application.kt

@@ -1,9 +1,11 @@
 package org.domaindrivenarchitecture.provs.server.application
 
 import org.domaindrivenarchitecture.provs.framework.core.cli.createProvInstance
+import org.domaindrivenarchitecture.provs.server.domain.ServerCliCommand
 import org.domaindrivenarchitecture.provs.server.domain.ServerType
 import org.domaindrivenarchitecture.provs.server.domain.k3s.K3sCliCommand
 import org.domaindrivenarchitecture.provs.server.domain.k3s.provisionK3s
+import org.domaindrivenarchitecture.provs.server.infrastructure.genericFileExistenceCheck
 import kotlin.system.exitProcess
 
 
@@ -18,13 +20,26 @@ fun main(args: Array<String>) {
     val checkedArgs = if (args.isEmpty()) arrayOf("-h") else args
 
     val cmd = CliArgumentsParser("provs-server.jar subcommand target").parseCommand(checkedArgs)
-    if (!cmd.isValid()) {
-        println("Arguments are not valid, pls try -h for help.")
+
+    // input validation
+    if (!cmd.isValidTarget()) {
+        println("Remote or localhost not valid, please try -h for help.")
+        exitProcess(1)
+    }
+    if (!cmd.isValidConfigFileName()) {
+        println("Config file not found. Please check if path is correct.")
         exitProcess(1)
     }
+    if (!(cmd as K3sCliCommand).isValidApplicationFileName()) {
+        println("Application file not found. Please check if path is correct.")
+        exitProcess(1)
+    }
+
     val prov = createProvInstance(cmd.target)
-    when(cmd.serverType) {
-        ServerType.K3S -> prov.provisionK3s(cmd as K3sCliCommand)
-        else -> { throw RuntimeException("Unknown serverType") }
+
+    if (!cmd.isValidServerType()) {
+        throw RuntimeException("Unknown serverType. Currently only k3s is accepted.")
+    } else {
+        prov.provisionK3s(cmd as K3sCliCommand)
     }
 }

src/main/kotlin/org/domaindrivenarchitecture/provs/server/domain/ServerCliCommand.kt

@@ -2,6 +2,7 @@ package org.domaindrivenarchitecture.provs.server.domain
 
 import org.domaindrivenarchitecture.provs.configuration.domain.ConfigFileName
 import org.domaindrivenarchitecture.provs.configuration.domain.TargetCliCommand
+import org.domaindrivenarchitecture.provs.server.infrastructure.genericFileExistenceCheck
 
 enum class ServerType {
     K3D, K3S
@@ -12,7 +13,16 @@ open class ServerCliCommand(
     val target: TargetCliCommand,
     val configFileName: ConfigFileName?,)
 {
-    fun isValid(): Boolean {
+    fun isValidServerType(): Boolean {
+        return serverType == ServerType.K3S
+    }
+    fun isValidTarget(): Boolean {
         return target.isValid()
     }
+    fun isValidConfigFileName(): Boolean {
+        if (configFileName == null) {
+            return true
+        }
+        return genericFileExistenceCheck(configFileName.fileName)
+    }
 }

src/main/kotlin/org/domaindrivenarchitecture/provs/server/domain/k3s/K3sCliCommand.kt

@@ -4,6 +4,7 @@ import org.domaindrivenarchitecture.provs.configuration.domain.ConfigFileName
 import org.domaindrivenarchitecture.provs.configuration.domain.TargetCliCommand
 import org.domaindrivenarchitecture.provs.server.domain.ServerCliCommand
 import org.domaindrivenarchitecture.provs.server.domain.ServerType
+import org.domaindrivenarchitecture.provs.server.infrastructure.genericFileExistenceCheck
 
 class K3sCliCommand(
     serverType: ServerType,
@@ -12,7 +13,15 @@ class K3sCliCommand(
     val applicationFileName: ApplicationFileName?,
     val submodules: List<String>? = null,
     val reprovision: Reprovision = false
-) :
-    ServerCliCommand(
-        serverType, target, configFileName
-    )
+) : ServerCliCommand(
+    serverType,
+    target,
+    configFileName
+) {
+    fun isValidApplicationFileName(): Boolean {
+        if (applicationFileName == null) {
+            return true
+        }
+        return genericFileExistenceCheck(applicationFileName.fileName)
+    }
+}

src/main/kotlin/org/domaindrivenarchitecture/provs/server/infrastructure/CliConvenience.kt

@@ -8,7 +8,6 @@ fun Prov.provisionServerCliConvenience() = task {
 }
 
 fun Prov.provisionKubectlCompletionAndAlias(): ProvResult = task {
-
     cmd("kubectl completion bash | sudo tee /etc/bash_completion.d/kubectl > /dev/null")
     cmd("echo 'alias k=kubectl' >>~/.bashrc")
     cmd("echo 'complete -o default -F __start_kubectl k' >>~/.bashrc")

src/main/kotlin/org/domaindrivenarchitecture/provs/server/infrastructure/localFiles.kt

@@ -0,0 +1,12 @@
+package org.domaindrivenarchitecture.provs.server.infrastructure
+
+import java.io.File
+
+fun genericFileExistenceCheck(fileName: String): Boolean {
+    if (fileName.isEmpty()) {
+        return false
+    } else if ((!File(fileName).exists())) {
+        return false
+    }
+    return true
+}

src/test/kotlin/org/domaindrivenarchitecture/provs/server/application/CliArgumentParserTest.kt

@@ -19,8 +19,9 @@ internal class CliArgumentParserTest {
         val result = parser.parseCommand(args = arrayOf("k3s", "local", "-c", "config.yaml"))
 
         // then
-        assertTrue(result.isValid())
-        assertEquals(ServerType.K3S, result.serverType)
+        assertTrue(result.isValidServerType())
+        assertTrue(result.isValidTarget())
+        assertTrue(result.isValidConfigFileName())
     }
 
     @Test
@@ -32,8 +33,9 @@ internal class CliArgumentParserTest {
         val result: K3sCliCommand = parser.parseCommand(args = arrayOf("k3s", "local", "-o", "grafana")) as K3sCliCommand
 
         // then
-        assertTrue(result.isValid())
-        assertEquals(ServerType.K3S, result.serverType)
+        assertTrue(result.isValidServerType())
+        assertTrue(result.isValidTarget())
+        assertTrue(result.isValidConfigFileName())
         assertEquals(listOf("grafana"), result.submodules)
         assertEquals(TargetCliCommand("local"), result.target)
     }
@@ -47,8 +49,8 @@ internal class CliArgumentParserTest {
         val result: K3sCliCommand = parser.parseCommand(args = arrayOf("k3s", "user@host.com", "-a", "app.yaml")) as K3sCliCommand
 
         // then
-        assertTrue(result.isValid())
-        assertEquals(ServerType.K3S, result.serverType)
+        assertTrue(result.isValidTarget())
+        assertTrue(result.isValidServerType())
         assertEquals(ApplicationFileName("app.yaml"), result.applicationFileName)
         assertEquals(TargetCliCommand("user@host.com"), result.target)
     }