Added EInvoiceValidator to validate eInvoice files

README.md

@@ -29,6 +29,18 @@ val mailsWithEInvoices = mailReader.listAllMessagesWithEInvoice(MailAccount(
 ))
 ```
 
+### Validate eInvoice
+
+```kotlin
+val validator = EInvoiceValidator()
+val invoiceFile = File("ZUGFeRD.pdf") // or XRechnung,xml, ...
+
+val result = validator.validate(invoiceFile)
+
+println("Is valid? ${result.isValid}")
+println(result.report)
+```
+
 ## Create eInvoice
 
 ```kotlin

e-invoicing-domain/build.gradle.kts

@@ -20,6 +20,7 @@ val logbackVersion: String by project
 
 dependencies {
     implementation("org.mustangproject:library:$mustangVersion")
+    implementation("org.mustangproject:validator:$mustangVersion")
 
     implementation("org.eclipse.angus:angus-mail:$angusMailVersion")
 

e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/validation/EInvoiceValidator.kt

@@ -0,0 +1,20 @@
+package net.codinux.invoicing.validation
+
+import org.mustangproject.validator.ZUGFeRDValidator
+import java.io.File
+
+class EInvoiceValidator {
+
+    fun validate(fileToValidate: File, disableNotices: Boolean = false): InvoiceValidationResult {
+        val validator = ZUGFeRDValidator()
+        if (disableNotices) {
+            validator.disableNotices()
+        }
+
+        // TODO: this is far from ideal to have to report only as string and not the single failures as objects
+        val report = validator.validate(fileToValidate.absolutePath)
+
+        return InvoiceValidationResult(validator.wasCompletelyValid(), report)
+    }
+
+}

e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/validation/InvoiceValidationResult.kt

@@ -0,0 +1,11 @@
+package net.codinux.invoicing.validation
+
+class InvoiceValidationResult(
+    val isValid: Boolean,
+    val report: String
+) {
+    override fun toString() = when (isValid) {
+        true -> "Valid: $report"
+        false -> "Invalid: $report"
+    }
+}

e-invoicing-domain/src/test/kotlin/net/codinux/invoicing/Demonstration.kt

@@ -7,6 +7,7 @@ import net.codinux.invoicing.model.Invoice
 import net.codinux.invoicing.model.LineItem
 import net.codinux.invoicing.model.Party
 import net.codinux.invoicing.reader.EInvoiceReader
+import net.codinux.invoicing.validation.EInvoiceValidator
 import java.io.File
 import java.math.BigDecimal
 import java.time.LocalDate
@@ -34,6 +35,17 @@ class Demonstration {
         ))
     }
 
+    fun validate() {
+        val validator = EInvoiceValidator()
+        val invoiceFile = File("ZUGFeRD.pdf") // or XRechnung,xml, ...
+
+        val result = validator.validate(invoiceFile)
+
+        println("Is valid? ${result.isValid}")
+        println(result.report)
+    }
+
+
     fun create() {
         val invoice = createInvoice()
         val pdfResultFile = File.createTempFile("Zugferd", ".pdf")

e-invoicing-domain/src/test/kotlin/net/codinux/invoicing/validation/EInvoiceValidatorTest.kt

@@ -0,0 +1,49 @@
+package net.codinux.invoicing.validation
+
+import assertk.assertThat
+import assertk.assertions.isFalse
+import assertk.assertions.isNotEmpty
+import assertk.assertions.isTrue
+import java.io.File
+import kotlin.test.Test
+
+class EInvoiceValidatorTest {
+
+    private val underTest = EInvoiceValidator()
+
+
+    @Test
+    fun validateXRechnung() {
+        val testFile = getTestFile("XRechnung.xml")
+
+        val result = underTest.validate(testFile)
+
+        assertThat(result.isValid).isFalse() // TODO: add required properties to XRechnung.xml
+        assertThat(result.report).isNotEmpty()
+    }
+
+    @Test
+    fun validateZugferdPdf() {
+        val testFile = getTestFile("ZUGFeRD.pdf")
+
+        val result = underTest.validate(testFile)
+
+        assertThat(result.isValid).isTrue()
+        assertThat(result.report).isNotEmpty()
+    }
+
+    @Test
+    fun validateZugferdXml() {
+        val testFile = getTestFile("ZUGFeRD.xml")
+
+        val result = underTest.validate(testFile)
+
+        assertThat(result.isValid).isTrue()
+        assertThat(result.report).isNotEmpty()
+    }
+
+
+    private fun getTestFile(filename: String): File =
+        File(this.javaClass.classLoader.getResource("files/$filename")!!.toURI())
+
+}