Introduction to SdI

.gitattributes

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+* text=auto eol=lf

.github/PULL_REQUEST_TEMPLATE.md

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+## Pull Request Summary
+
+<!-- Briefly describe the problem you are solving. -->
+
+## Feedback
+
+<!-- You can describe your doubts, thoughts and questions. -->

sdi/README.md

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+# SdI (Sistema di Interscambio)
+
+## SDICoop Web Service
+
+### Test
+
+- [Test URI](https://testservizi.fatturapa.it/)
+
+### Production
+
+- [Production URI](https://fatturapa.it/)
+
+## Links
+
+- [Manage the channel](https://sdi.fatturapa.gov.it/SdI2FatturaPAWebSpa/GestireCanaleAction.do)

sdi/cert/README.md

@@ -0,0 +1,32 @@
+# Certificates
+
+[Source link](https://www.fatturapa.gov.it/it/norme-e-regole/DocumentazioneSDI/)
+
+## Test Certificates
+
+Contents of the `test` folder:
+
+- `testservizi.fatturapa.it.cer`: SERVER certificate exposed by
+   the test services of SdI (Sistema di Interscambio)
+- `SistemaInterscambioFatturaPATest.cer`: Public part of the CLIENT certificate
+   used by SdI (Sistema di Interscambio) to invoke the test services exposed by you
+
+## Production Certificates
+
+Contents of the `production` folder:
+
+- `servizi.fatturapa.it.cer`: SERVER certificate exposed by
+  the services of SdI (Sistema di Interscambio)
+- `Sistema_Interscambio_Fattura_PA.cer`: Public part of the CLIENT certificate
+  used by SdI (Sistema di Interscambio) to invoke the services exposed by you
+
+## CA Certificates
+
+Contents of the `ca` folder:
+
+- `caentrate.cer`: CA certificate for the production environment
+- `CAEntratetest.cer`: CA certificate to validate the test SdI certificate
+- `Sectigo RSA.cer`: CA certificate for servizi.fatturapa.it.cer
+  for the production environment
+- `UserTrustCA.cer`: CA certificate for servizi.fatturapa.it.cer
+  for the production environment

sdi/cert/ca/CAEntratetest.cer

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+R+Y=
+-----END CERTIFICATE-----

sdi/cert/ca/Sectigo RSA.cer

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sdi/cert/ca/caentrate.cer

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sdi/cert/production/Sistema_Interscambio_Fattura_PA.cer

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+UPHQOUeB+XN51YkrB+xYm69cpXPq1aO23foOMomuv23WDVa+4+UU+uB59/9OBlNR
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+Jnles755gFodRCYm2ovVHS7N3F0ABt4fIjpijQLTFKQmu/umfUWo0s3mCoqaFZf4
+CVKxUfU=
+-----END CERTIFICATE-----

sdi/cert/production/servizi.fatturapa.it.cer

@@ -0,0 +1,37 @@
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sdi/cert/test/SistemaInterscambioFatturaPATest.cer

@@ -0,0 +1,29 @@
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+NXrHNA04h0Q2

sdi/cert_pool.go

@@ -0,0 +1,44 @@
+package sdi
+
+import (
+	"crypto/x509"
+	"log"
+	"os"
+	"path/filepath"
+)
+
+func loadCACertFromFile(certPath string) (*x509.Certificate, error) {
+	caCert, err := os.ReadFile(certPath)
+	if err != nil {
+		return nil, err
+	}
+
+	cert, err := x509.ParseCertificate(caCert)
+	if err != nil {
+		return nil, err
+	}
+
+	return cert, nil
+}
+
+// PrepareCertPoolFromDir returns caCertPool from selected folder
+func PrepareCertPoolFromDir(dir string) (*x509.CertPool, error) {
+	caCertPool := x509.NewCertPool()
+
+	// Find files matching the "*.pem" pattern in the directory
+	matches, err := filepath.Glob(filepath.Join(dir, "*.cer"))
+	if err != nil {
+		return nil, err
+	}
+
+	for _, match := range matches {
+		cert, err := loadCACertFromFile(match)
+		if err != nil {
+			log.Printf("Error reading certificate %s: %v", match, err)
+			continue
+		}
+		caCertPool.AddCert(cert)
+	}
+
+	return caCertPool, nil
+}

sdi/cert_pool_test.go

@@ -0,0 +1,22 @@
+package sdi_test
+
+import (
+	"crypto/x509"
+	"testing"
+
+	sdi "github.com/invopop/gobl.fatturapa/sdi"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestPrepareCertPoolFromDir(t *testing.T) {
+	t.Run("should return empty Cert Pool when folder has no cert files", func(t *testing.T) {
+		expectedCertPool := x509.NewCertPool()
+		caCertPool, err := sdi.PrepareCertPoolFromDir(".")
+
+		require.NoError(t, err)
+		assert.Equal(t, expectedCertPool, caCertPool)
+		assert.Equal(t, 0, len(caCertPool.Subjects())) // nolint:staticcheck //
+	})
+}

sdi/http_client.go

@@ -0,0 +1,21 @@
+package sdi
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"net/http"
+	"time"
+)
+
+// HTTPClient returns HTTP client with Cert Pool
+func HTTPClient(caCertPool *x509.CertPool) *http.Client {
+	httpClient := &http.Client{
+		Timeout: 2500 * time.Millisecond,
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{
+				RootCAs: caCertPool,
+			},
+		},
+	}
+	return httpClient
+}