Refactor contact info handling in PDF signing

Replaced the `ContactInfo` property with separate `Email` and `Phone` fields in `PdfSignOptionsDto` and `PdfSignatureCheckItemDto` for better granularity. Updated the `PdfDigitalSignatureService` to handle the new fields, introducing `BuildContactInfo` and `ParseContactInfo` methods for constructing and parsing contact information.

Modified the `PdfSignatureController` to reflect these changes, updating request models and the `SignPdfAsync` method. Updated the `README.md` to document the new structure. These changes improve the clarity and structure of contact information handling.

EnvelopeGenerator.Infrastructure.Crypt/README.md

@@ -239,7 +239,7 @@ Sicherheitsregel:
   - `SignPdfAsync(...)`, `CheckPdfSignatureAsync(...)`, `ExtractOriginalPdfAsync(...)`
 - `IPkcs11SelfTestStatusProvider`
 - `PdfSignOptionsDto`
-  - `UUID`, `Reason`, `Name`, `Location`, `ContactInfo`, `SigningTime`, `CertificationLevel`
+  - `UUID`, `Reason`, `Name`, `Location`, `Email`, `Phone`, `CertificationLevel`
 - `PdfSignatureCheckResultDto` / `PdfSignatureCheckItemDto`
   - inklusive `BusinessReason`, `UUID`, `OriginalDocumentSha256`
 - `Pkcs11SelfTestStatusDto`

EnvelopeGenerator.Infrastructure.Crypt/Services/PdfDigitalSignatureService.cs

@@ -42,7 +42,7 @@ public sealed class PdfDigitalSignatureService(IOptions<Pkcs11Options> options)
             Name = request.Name ?? pkcs11Options.CertificateLabel,
             Reason = reasonWithMeta,
             Location = request.Location,
-            ContactInfo = request.ContactInfo,
+            ContactInfo = BuildContactInfo(request.Email, request.Phone),
             SigningTime = pkcs11Options.UseUtcSigningTime ? DateTimeOffset.UtcNow : DateTimeOffset.Now,
             ApplicationName = pkcs11Options.ApplicationName,
             CertificationLevel = ToDevExpressCertificationLevel(request.CertificationLevel)
@@ -108,6 +108,7 @@ public sealed class PdfDigitalSignatureService(IOptions<Pkcs11Options> options)
                 var issuedTo = ParsePrincipal(certificate?.Subject);
                 var issuedBy = ParsePrincipal(certificate?.Issuer);
                 var reasonMeta = ParseReasonMeta(signature.Reason);
+                var contact = ParseContactInfo(signature.ContactInfo);
 
                 items.Add(new PdfSignatureCheckItemDto(
                     CoversWholeDoc: coversWholeDocument,
@@ -116,6 +117,8 @@ public sealed class PdfDigitalSignatureService(IOptions<Pkcs11Options> options)
                     Location: signature.Location,
                     DeclaredName: signature.SignerName,
                     ContactInfo: signature.ContactInfo,
+                    Email: contact.Email,
+                    Phone: contact.Phone,
                     DigestAlgorithm: InferDigestAlgorithm(certificate),
                     SignatureAlgorithm: InferSignatureAlgorithm(certificate),
                     SignerName: issuedTo.CommonName ?? signature.SignerName,
@@ -140,6 +143,7 @@ public sealed class PdfDigitalSignatureService(IOptions<Pkcs11Options> options)
             catch (Exception ex)
             {
                 var reasonMeta = ParseReasonMeta(signature.Reason);
+                var contact = ParseContactInfo(signature.ContactInfo);
 
                 items.Add(new PdfSignatureCheckItemDto(
                     CoversWholeDoc: false,
@@ -148,6 +152,8 @@ public sealed class PdfDigitalSignatureService(IOptions<Pkcs11Options> options)
                     Location: signature.Location,
                     DeclaredName: signature.SignerName,
                     ContactInfo: signature.ContactInfo,
+                    Email: contact.Email,
+                    Phone: contact.Phone,
                     DigestAlgorithm: null,
                     SignatureAlgorithm: null,
                     SignerName: signature.SignerName,
@@ -463,6 +469,60 @@ public sealed class PdfDigitalSignatureService(IOptions<Pkcs11Options> options)
         return $"{prefix}| SFMETA:v1;doc={uuid};sha256={sourceHashHex}";
     }
 
+    private static string? BuildContactInfo(string? email, string? phone)
+    {
+        var normalizedEmail = string.IsNullOrWhiteSpace(email) ? null : email.Trim();
+        var normalizedPhone = string.IsNullOrWhiteSpace(phone) ? null : phone.Trim();
+
+        if (normalizedEmail is null && normalizedPhone is null)
+            return null;
+
+        if (normalizedEmail is null)
+            return $"tel:{normalizedPhone}";
+
+        if (normalizedPhone is null)
+            return $"mailto:{normalizedEmail}";
+
+        return $"mailto:{normalizedEmail};tel:{normalizedPhone}";
+    }
+
+    private static (string? Email, string? Phone) ParseContactInfo(string? contactInfo)
+    {
+        if (string.IsNullOrWhiteSpace(contactInfo))
+            return (null, null);
+
+        string? email = null;
+        string? phone = null;
+
+        foreach (var part in contactInfo.Split(';', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries))
+        {
+            if (part.StartsWith("mailto:", StringComparison.OrdinalIgnoreCase))
+            {
+                email = part[7..].Trim();
+                continue;
+            }
+
+            if (part.StartsWith("tel:", StringComparison.OrdinalIgnoreCase))
+            {
+                phone = part[4..].Trim();
+                continue;
+            }
+
+            if (email is null && part.Contains('@', StringComparison.Ordinal))
+            {
+                email = part.Trim();
+                continue;
+            }
+
+            if (phone is null)
+                phone = part.Trim();
+        }
+
+        return (
+            string.IsNullOrWhiteSpace(email) ? null : email,
+            string.IsNullOrWhiteSpace(phone) ? null : phone);
+    }
+
     private static (string? BusinessReason, string? UUID, string? OriginalDocumentSha256) ParseReasonMeta(string? reason)
     {
         if (string.IsNullOrWhiteSpace(reason))