Replace Logging with Serilog; add new configurations

Replaced the `Logging` configuration in both `appsettings.json`
and `appsettings.Development.json` with Serilog, enabling
structured logging with configurable sinks and enrichment.

Added `DocumentOperatorSettings` to manage temporary files
and logging details. Introduced `RedisSettings` for Redis
integration, including connection string and cache settings.

Added `ApiKeySettings` to support tenant-specific API key
validation with detailed configuration for each tenant.

These changes improve logging, caching, and configuration
management for better maintainability and extensibility.

DocumentOperator.API/Configuration/SerilogConfiguration.cs

@@ -0,0 +1,6 @@
+namespace DocumentOperator.API.Configuration
+{
+    public class SerilogConfiguration
+    {
+    }
+}

DocumentOperator.API/Configuration/SwaggerConfiguration.cs

@@ -0,0 +1,6 @@
+namespace DocumentOperator.API.Configuration
+{
+    public class SwaggerConfiguration
+    {
+    }
+}

DocumentOperator.API/DocumentOperator.API.csproj

@@ -7,6 +7,9 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Asp.Versioning.Http" Version="8.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Caching.StackExchangeRedis" Version="8.0.28" />
+    <PackageReference Include="Serilog.AspNetCore" Version="10.0.0" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.6.2" />
   </ItemGroup>
 
@@ -16,8 +19,4 @@
     <ProjectReference Include="..\DocumentOperator.Infrastructure\DocumentOperator.Infrastructure.csproj" />
   </ItemGroup>
 
-  <ItemGroup>
-    <Folder Include="Controllers\" />
-  </ItemGroup>
-
 </Project>

DocumentOperator.API/Endpoints/v1/DocumentEndpoints.cs

@@ -0,0 +1,6 @@
+namespace DocumentOperator.API.Endpoints.v1
+{
+    public class DocumentEndpoints
+    {
+    }
+}

DocumentOperator.API/Middleware/ExceptionHandlingMiddleware.cs

@@ -0,0 +1,6 @@
+namespace DocumentOperator.API.Middleware
+{
+    public class ExceptionHandlingMiddleware
+    {
+    }
+}

DocumentOperator.API/Middleware/RequestLoggingMiddleware.cs

@@ -0,0 +1,6 @@
+namespace DocumentOperator.API.Middleware
+{
+    public class RequestLoggingMiddleware
+    {
+    }
+}

DocumentOperator.API/Middleware/TenantResolutionMiddleware.cs

@@ -0,0 +1,6 @@
+namespace DocumentOperator.API.Middleware
+{
+    public class TenantResolutionMiddleware
+    {
+    }
+}

DocumentOperator.API/appsettings.Development.json

@@ -1,8 +1,16 @@
 {
-  "Logging": {
-    "LogLevel": {
-      "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
-    }
+  "Serilog": {
+    "MinimumLevel": {
+      "Default": "Debug"
+    }
+  },
+
+  "DocumentOperatorSettings": {
+    "TempFolderPath": "C:\\Temp\\DocumentOperator\\Dev",
+    "EnableDetailedLogging": true
+  },
+
+  "RedisSettings": {
+    "ConnectionString": "localhost:6379"
   }
 }

DocumentOperator.API/appsettings.json

@@ -5,5 +5,62 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+
+  "Serilog": {
+    "MinimumLevel": {
+      "Default": "Information",
+      "Override": {
+        "Microsoft": "Warning",
+        "Microsoft.AspNetCore": "Warning",
+        "System": "Warning"
+      }
+    },
+    "WriteTo": [
+      {
+        "Name": "Console",
+        "Args": {
+          "outputTemplate": "[{Timestamp:HH:mm:ss} {Level:u3}] {Message:lj} {Properties:j}{NewLine}{Exception}"
+        }
+      },
+      {
+        "Name": "File",
+        "Args": {
+          "path": "Logs/log-.txt",
+          "rollingInterval": "Day",
+          "outputTemplate": "{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} [{Level:u3}] {Message:lj} {Properties:j}{NewLine}{Exception}"
+        }
+      }
+    ],
+    "Enrich": [ "FromLogContext", "WithMachineName", "WithThreadId" ]
+  },
+
+  "DocumentOperatorSettings": {
+    "TempFolderPath": "C:\\Temp\\DocumentOperator",
+    "TempFileRetentionHours": 24,
+    "MaxPdfSizeMB": 50,
+    "EnableDetailedLogging": true
+  },
+
+  "RedisSettings": {
+    "ConnectionString": "localhost:6379",
+    "InstanceName": "DocumentOperator:",
+    "CacheExpirationMinutes": 60
+  },
+
+  "ApiKeySettings": {
+    "EnableValidation": true,
+    "Keys": {
+      "customer-a-key-12345": {
+        "TenantId": "customer-a",
+        "TenantName": "Customer A GmbH",
+        "IsActive": true
+      },
+      "customer-b-key-67890": {
+        "TenantId": "customer-b",
+        "TenantName": "Customer B AG",
+        "IsActive": true
+      }
+    }
+  }
 }

DocumentOperator.Application/DocumentOperator.Application.csproj

@@ -6,8 +6,28 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Ardalis.Result" Version="10.1.0" />
+    <PackageReference Include="FluentValidation" Version="12.1.1" />
+    <PackageReference Include="FluentValidation.DependencyInjectionExtensions" Version="12.1.1" />
+    <PackageReference Include="MediatR" Version="14.1.0" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\DocumentOperator.Domain\DocumentOperator.Domain.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Folder Include="Common\Interfaces\" />
+    <Folder Include="Common\Behaviors\" />
+    <Folder Include="Common\DTOs\" />
+    <Folder Include="Common\Mappings\" />
+    <Folder Include="DependencyInjection\" />
+    <Folder Include="Features\Documents\ExtractAttachments\" />
+    <Folder Include="Features\Documents\ConcatenatePdfs\" />
+    <Folder Include="Features\Documents\ApplyStamp\" />
+    <Folder Include="Features\Documents\EmbedCertificate\" />
+    <Folder Include="Features\Documents\ValidatePdf\" />
+  </ItemGroup>
+
 </Project>

DocumentOperator.Application/Features/Documents/ProcessDocument/ProcessDocumentCommand.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DocumentOperator.Application.Features.Documents.ProcessDocument
+{
+    internal class ProcessDocumentCommand
+    {
+    }
+}

DocumentOperator.Application/Features/Documents/ProcessDocument/ProcessDocumentHandler.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DocumentOperator.Application.Features.Documents.ProcessDocument
+{
+    internal class ProcessDocumentHandler
+    {
+    }
+}

DocumentOperator.Application/Features/Documents/ProcessDocument/ProcessDocumentValidator.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DocumentOperator.Application.Features.Documents.ProcessDocument
+{
+    internal class ProcessDocumentValidator
+    {
+    }
+}

DocumentOperator.Domain/DocumentOperator.Domain.csproj

@@ -6,4 +6,12 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <Folder Include="Common\Exceptions\" />
+    <Folder Include="Common\Results\" />
+    <Folder Include="Constants\" />
+    <Folder Include="Models\Enums\" />
+    <Folder Include="Models\ValueObjects\" />
+  </ItemGroup>
+
 </Project>

DocumentOperator.Infrastructure/DocumentOperator.Infrastructure.csproj

@@ -6,9 +6,22 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="DevExpress.Pdf.Core" Version="25.2.8" />
+    <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="8.0.0" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\DocumentOperator.Application\DocumentOperator.Application.csproj" />
     <ProjectReference Include="..\DocumentOperator.Domain\DocumentOperator.Domain.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Folder Include="Configuration\" />
+    <Folder Include="DependencyInjection\" />
+    <Folder Include="Services\FileStorage\" />
+    <Folder Include="Services\DocumentValidation\" />
+    <Folder Include="Services\PdfProcessing\" />
+  </ItemGroup>
+
 </Project>