Added backend functions

.gitlab-ci.yml

@@ -9,7 +9,7 @@ install-mobile:
   stage: install
   image: node:lts-alpine
   before_script:
-    - cd src/WorkTime.Mobile
+    - cd src/WorkTime.WebMobile
   script:
     - npm install --prefer-offline
   cache:
@@ -30,7 +30,7 @@ lint-mobile:
   image: node:lts-alpine
   needs: ["install-mobile"]
   before_script:
-    - cd src/WorkTime.Mobile
+    - cd src/WorkTime.WebMobile
   script:
     - npm run lint
   cache:
@@ -46,7 +46,7 @@ build-mobile:
   image: node:lts-alpine
   needs: ["lint-mobile"]
   before_script:
-    - cd src/WorkTime.Mobile
+    - cd src/WorkTime.WebMobile
   script:
     - npm run build
   artifacts:
@@ -90,7 +90,7 @@ publish-mobile:
     - name: docker:dind
       alias: docker
   before_script:
-    - cd src/WorkTime.Mobile
+    - cd src/WorkTime.WebMobile
   script:
     - export VERSION=$(echo $CI_COMMIT_TAG | sed 's/^v//')
     - docker login -u leon.hoppe -p ${CI_REGISTRY_PASSWORD} registry.leon-hoppe.de

WorkTime.sln

@@ -6,6 +6,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WorkTime.Host", "src\WorkTi
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WorkTime.ServiceDefaults", "src\WorkTime.ServiceDefaults\WorkTime.ServiceDefaults.csproj", "{B66AA463-03D5-4814-B1D4-71663804248C}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WorkTime.Shared", "src\WorkTime.Shared\WorkTime.Shared.csproj", "{E6A73E21-39B8-4FA7-8D6D-D5DDB8FB8AF0}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WorkTime.Api", "src\WorkTime.Api\WorkTime.Api.csproj", "{CED653D6-A0B6-432B-9C36-FBB58EEA8229}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -14,6 +18,8 @@ Global
 	GlobalSection(NestedProjects) = preSolution
 		{6F5D4D47-1484-44EA-A5DD-D00AAD2F2F68} = {25C5A6B2-A1F9-4244-9538-18E3FE76D382}
 		{B66AA463-03D5-4814-B1D4-71663804248C} = {25C5A6B2-A1F9-4244-9538-18E3FE76D382}
+		{E6A73E21-39B8-4FA7-8D6D-D5DDB8FB8AF0} = {25C5A6B2-A1F9-4244-9538-18E3FE76D382}
+		{CED653D6-A0B6-432B-9C36-FBB58EEA8229} = {25C5A6B2-A1F9-4244-9538-18E3FE76D382}
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
 		{6F5D4D47-1484-44EA-A5DD-D00AAD2F2F68}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
@@ -24,5 +30,13 @@ Global
 		{B66AA463-03D5-4814-B1D4-71663804248C}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{B66AA463-03D5-4814-B1D4-71663804248C}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{B66AA463-03D5-4814-B1D4-71663804248C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E6A73E21-39B8-4FA7-8D6D-D5DDB8FB8AF0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E6A73E21-39B8-4FA7-8D6D-D5DDB8FB8AF0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E6A73E21-39B8-4FA7-8D6D-D5DDB8FB8AF0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E6A73E21-39B8-4FA7-8D6D-D5DDB8FB8AF0}.Release|Any CPU.Build.0 = Release|Any CPU
+		{CED653D6-A0B6-432B-9C36-FBB58EEA8229}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CED653D6-A0B6-432B-9C36-FBB58EEA8229}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CED653D6-A0B6-432B-9C36-FBB58EEA8229}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{CED653D6-A0B6-432B-9C36-FBB58EEA8229}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal

src/WorkTime.Api/AuthHandler.cs

@@ -0,0 +1,60 @@
+using System.Security.Claims;
+using System.Text.Encodings.Web;
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.AspNetCore.OpenApi;
+using Microsoft.Extensions.Options;
+using Microsoft.OpenApi.Models;
+using WorkTime.Shared.Services;
+
+namespace WorkTime.Api;
+
+public class AuthHandler(
+    IOptionsMonitor<AuthenticationSchemeOptions> options,
+    ILoggerFactory logger,
+    UrlEncoder encoder,
+    IAuthService authService)
+    : AuthenticationHandler<AuthenticationSchemeOptions>(options, logger, encoder) {
+
+    protected override async Task<AuthenticateResult> HandleAuthenticateAsync() {
+        if (! await authService.IsAuthenticated()) {
+            return AuthenticateResult.Fail("Invalid or missing Guid.");
+        }
+
+        var guid = await authService.GetCurrentUserId();
+
+        var claims = new[] { new Claim(ClaimTypes.NameIdentifier, guid.ToString()) };
+        var identity = new ClaimsIdentity(claims, Scheme.Name);
+        var principal = new ClaimsPrincipal(identity);
+        var ticket = new AuthenticationTicket(principal, Scheme.Name);
+
+        return AuthenticateResult.Success(ticket);
+    }
+
+    public static Task ConfigureOpenApi(OpenApiDocument document, OpenApiDocumentTransformerContext transformerContext, CancellationToken token) {
+        document.Components ??= new OpenApiComponents();
+        document.Components.SecuritySchemes ??= new Dictionary<string, OpenApiSecurityScheme>();
+        document.SecurityRequirements ??= new List<OpenApiSecurityRequirement>();
+        
+        document.Components.SecuritySchemes.Add(nameof(AuthHandler), new OpenApiSecurityScheme {
+            Type = SecuritySchemeType.Http,
+            In = ParameterLocation.Header,
+            Name = IAuthService.HeaderName,
+            Scheme = "Bearer",
+            Description = "GUID Authorization header using a custom scheme.\nExample: \"Authorization: {GUID}\""
+        });
+
+        //TODO: only add security requirement to authorized endpoints
+        document.SecurityRequirements.Add(new() {
+            {
+                new() {
+                    Reference = new OpenApiReference {
+                        Type = ReferenceType.SecurityScheme,
+                        Id = nameof(AuthHandler)
+                    }
+                }, []
+            }
+        });
+
+        return Task.CompletedTask;
+    }
+}

src/WorkTime.Api/Controllers/AuthController.cs

@@ -0,0 +1,13 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace WorkTime.Api.Controllers;
+
+[ApiController, Route("auth")]
+public class AuthController : ControllerBase {
+
+    [HttpGet("register")]
+    public ActionResult<Guid> Register() {
+        return Ok(Guid.NewGuid().ToString());
+    }
+    
+}

src/WorkTime.Api/Controllers/EntryController.cs

@@ -0,0 +1,35 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using WorkTime.Api.Logic;
+using WorkTime.Shared.Models;
+
+namespace WorkTime.Api.Controllers;
+
+[ApiController, Route("entries"), Authorize]
+public class EntryController(EntryLogic logic) : ControllerBase {
+
+    [HttpGet("{id:guid}")]
+    public async Task<IResult> GetAllEntries(Guid id) {
+        var result = await logic.GetAllEntries(id);
+        return result.MapResult();
+    }
+
+    [HttpGet("{id:guid}/{day:datetime}")]
+    public async Task<IResult> GetEntries(Guid id, DateTime day) {
+        var result = await logic.GetEntries(id, DateOnly.FromDateTime(day));
+        return result.MapResult();
+    }
+
+    [HttpPost]
+    public async Task<IResult> AddEntry(TimeEntry entry) {
+        var result = await logic.AddEntry(entry);
+        return result.MapResult();
+    }
+
+    [HttpDelete("{id:int}")]
+    public async Task<IResult> DeleteEntry(int id) {
+        var result = await logic.DeleteEntry(id);
+        return result.MapResult();
+    }
+    
+}

src/WorkTime.Api/DatabaseContext.cs

@@ -0,0 +1,10 @@
+using Microsoft.EntityFrameworkCore;
+using WorkTime.Shared.Models;
+
+namespace WorkTime.Api;
+
+public class DatabaseContext(DbContextOptions<DatabaseContext> options) : DbContext(options) {
+
+    public DbSet<TimeEntry> Entries { get; set; }
+    
+}

src/WorkTime.Api/Dockerfile

@@ -0,0 +1,23 @@
+FROM mcr.microsoft.com/dotnet/aspnet:9.0 AS base
+USER $APP_UID
+WORKDIR /app
+EXPOSE 8080
+EXPOSE 8081
+
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
+ARG BUILD_CONFIGURATION=Release
+WORKDIR /src
+COPY ["src/WorkTime.Api/WorkTime.Api.csproj", "src/WorkTime.Api/"]
+RUN dotnet restore "src/WorkTime.Api/WorkTime.Api.csproj"
+COPY . .
+WORKDIR "/src/src/WorkTime.Api"
+RUN dotnet build "WorkTime.Api.csproj" -c $BUILD_CONFIGURATION -o /app/build
+
+FROM build AS publish
+ARG BUILD_CONFIGURATION=Release
+RUN dotnet publish "WorkTime.Api.csproj" -c $BUILD_CONFIGURATION -o /app/publish /p:UseAppHost=false
+
+FROM base AS final
+WORKDIR /app
+COPY --from=publish /app/publish .
+ENTRYPOINT ["dotnet", "WorkTime.Api.dll"]

src/WorkTime.Api/Logic/EntryLogic.cs

@@ -0,0 +1,57 @@
+using Microsoft.AspNetCore.Http.HttpResults;
+using WorkTime.ServiceDefaults.Results;
+using WorkTime.Shared.Models;
+using WorkTime.Shared.Repositories;
+using WorkTime.Shared.Services;
+
+namespace WorkTime.Api.Logic;
+
+public class EntryLogic(IEntryRepository entryRepository, IAuthService authService) {
+
+    public async Task<LogicResult<TimeEntry[]>> GetAllEntries(Guid owner) {
+        if (!await authService.IsAuthenticated())
+            return new(Results.Unauthorized());
+
+        if (await authService.GetCurrentUserId() != owner)
+            return new(Results.Unauthorized());
+
+        return await entryRepository.GetAllEntries(owner);
+    }
+
+    public async Task<LogicResult<TimeEntry[]>> GetEntries(Guid owner, DateOnly date) {
+        if (!await authService.IsAuthenticated())
+            return new(Results.Unauthorized());
+
+        if (await authService.GetCurrentUserId() != owner)
+            return new(Results.Unauthorized());
+
+        return await entryRepository.GetEntries(owner, date);
+    }
+
+    public async Task<LogicResult> AddEntry(TimeEntry entry) {
+        if (!await authService.IsAuthenticated())
+            return new(Results.Unauthorized());
+
+        if (await authService.GetCurrentUserId() != entry.Owner)
+            return new(Results.Unauthorized());
+
+        await entryRepository.AddEntry(entry);
+        return new();
+    }
+
+    public async Task<LogicResult> DeleteEntry(int id) {
+        if (!await authService.IsAuthenticated())
+            return new(Results.Unauthorized());
+
+        var entry = await entryRepository.GetEntry(id);
+        if (entry is null)
+            return new(Results.NotFound());
+
+        if (await authService.GetCurrentUserId() != entry.Owner)
+            return new(Results.Unauthorized());
+
+        await entryRepository.DeleteEntry(entry);
+        return new();
+    }
+    
+}

src/WorkTime.Api/Program.cs

@@ -0,0 +1,56 @@
+using MartinCostello.OpenApi;
+using Microsoft.AspNetCore.Authentication;
+using WorkTime.Api;
+using WorkTime.Api.Logic;
+using WorkTime.Api.Repositories;
+using WorkTime.Api.Services;
+using WorkTime.Shared.Repositories;
+using WorkTime.Shared.Services;
+
+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+// Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
+builder.Services.AddOpenApi(options => {
+    options.AddDocumentTransformer(AuthHandler.ConfigureOpenApi);
+});
+builder.Services.AddOpenApiExtensions(options => {
+    options.AddServerUrls = true;
+});
+
+builder.AddServiceDefaults();
+builder.Services.AddControllers();
+builder.Services.AddProblemDetails();
+builder.Services.AddHttpContextAccessor();
+
+builder.Services.AddNpgsql<DatabaseContext>(builder.Configuration.GetConnectionString("data"));
+builder.Services.AddScoped<IEntryRepository, EntryRepository>();
+builder.Services.AddScoped<IAuthService, AuthService>();
+
+builder.Services.AddScoped<EntryLogic>();
+
+builder.Services.AddAuthentication(nameof(AuthHandler))
+    .AddScheme<AuthenticationSchemeOptions, AuthHandler>(nameof(AuthHandler), _ => { });
+builder.Services.AddAuthorization();
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+if (app.Environment.IsDevelopment()) {
+    app.MapOpenApi();
+    app.UseSwaggerUI(options => {
+        options.SwaggerEndpoint("/openapi/v1.json", "WorkTime.Api");
+    });
+
+    await using var scope = app.Services.CreateAsyncScope();
+    var db = scope.ServiceProvider.GetRequiredService<DatabaseContext>();
+    db.Database.EnsureCreated();
+}
+
+app.UseHttpsRedirection();
+app.UseAuthentication();
+app.UseAuthorization();
+
+app.MapControllers();
+
+app.Run();

src/WorkTime.Api/Properties/launchSettings.json

@@ -0,0 +1,23 @@
+{
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": false,
+      "applicationUrl": "http://localhost:5212",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "https": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": false,
+      "applicationUrl": "https://localhost:7091;http://localhost:5212",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

src/WorkTime.Api/Repositories/EntryRepository.cs

@@ -0,0 +1,39 @@
+using Microsoft.EntityFrameworkCore;
+using WorkTime.Shared.Models;
+using WorkTime.Shared.Repositories;
+
+namespace WorkTime.Api.Repositories;
+
+internal class EntryRepository(DatabaseContext context) : IEntryRepository {
+    
+    public async Task<TimeEntry[]> GetAllEntries(Guid owner) {
+        return await context.Entries
+            .Where(entry => entry.Owner == owner)
+            .OrderBy(entry => entry.Timestamp)
+            .ToArrayAsync();
+    }
+    
+    public async Task<TimeEntry[]> GetEntries(Guid owner, DateOnly date) {
+        return await context.Entries
+            .Where(entry => entry.Owner == owner)
+            .Where(entry => DateOnly.FromDateTime(entry.Timestamp) == date)
+            .OrderBy(entry => entry.Timestamp)
+            .ToArrayAsync();
+    }
+
+    public async Task<TimeEntry?> GetEntry(int id) {
+        return await context.Entries
+            .FindAsync(id);
+    }
+
+    public async Task AddEntry(TimeEntry entry) {
+        await context.Entries.AddAsync(entry);
+        await context.SaveChangesAsync();
+    }
+    
+    public async Task DeleteEntry(TimeEntry entry) {
+        context.Entries.Remove(entry);
+        await context.SaveChangesAsync();
+    }
+    
+}

src/WorkTime.Api/Services/AuthService.cs

@@ -0,0 +1,29 @@
+using WorkTime.Shared.Services;
+
+namespace WorkTime.Api.Services;
+
+internal class AuthService(IHttpContextAccessor accessor) : IAuthService {
+    
+    public Task<bool> IsAuthenticated() {
+        var header = accessor.HttpContext?.Request.Headers[IAuthService.HeaderName];
+        if (header is not { Count: 1 })
+            return Task.FromResult(false);
+
+        var value = header.Value[0]!.Replace("Bearer ", "");
+        if (Guid.TryParse(value, out var guid))
+            return Task.FromResult(false);
+
+        return Task.FromResult(guid != Guid.Empty);
+    }
+    
+    public async Task<Guid> GetCurrentUserId() {
+        if (!await IsAuthenticated())
+            return Guid.Empty;
+
+        var header = accessor.HttpContext?.Request.Headers[IAuthService.HeaderName]!;
+        var value = header.Value[0]!.Replace("Bearer ", "");
+        
+        return Guid.Parse(value);
+    }
+    
+}

src/WorkTime.Api/WorkTime.Api.csproj

@@ -0,0 +1,28 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+    <PropertyGroup>
+        <TargetFramework>net9.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Aspire.Npgsql.EntityFrameworkCore.PostgreSQL" Version="9.1.0" />
+        <PackageReference Include="MartinCostello.OpenApi.Extensions" Version="1.0.0" />
+        <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.0"/>
+        <PackageReference Include="Swashbuckle.AspNetCore.SwaggerUI" Version="7.3.1" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <Content Include="..\..\.dockerignore">
+        <Link>.dockerignore</Link>
+      </Content>
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\WorkTime.ServiceDefaults\WorkTime.ServiceDefaults.csproj" />
+      <ProjectReference Include="..\WorkTime.Shared\WorkTime.Shared.csproj" />
+    </ItemGroup>
+
+</Project>

src/WorkTime.Api/appsettings.Development.json

@@ -0,0 +1,8 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

src/WorkTime.Api/appsettings.json

@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}

src/WorkTime.Host/Program.cs

@@ -3,6 +3,8 @@ var builder = DistributedApplication.CreateBuilder(args);
 var db = builder.AddPostgres("db")
     .WithDataVolume();
 
-
+builder.AddProject<Projects.WorkTime_Api>("api")
+    .WithReference(db.AddDatabase("data"))
+    .WaitFor(db);
 
 builder.Build().Run();

src/WorkTime.Host/WorkTime.Host.csproj

@@ -16,4 +16,8 @@
         <PackageReference Include="Aspire.Hosting.PostgreSQL" Version="9.1.0" />
     </ItemGroup>
 
+    <ItemGroup>
+      <ProjectReference Include="..\WorkTime.Api\WorkTime.Api.csproj" />
+    </ItemGroup>
+
 </Project>

src/WorkTime.ServiceDefaults/Results/LogicResult.cs

@@ -0,0 +1,98 @@
+using Microsoft.AspNetCore.Http;
+
+namespace WorkTime.ServiceDefaults.Results;
+
+public interface ILogicResult<TResult, TError> {
+
+    public TResult? Result { get; init; }
+
+    public TError? Error { get; init; }
+    
+    public bool IsSuccessful => Result is not null && Error is null;
+
+    IResult MapResult();
+
+}
+
+public interface ILogicResult<TResult> : ILogicResult<TResult, IResult>;
+
+public interface ILogicResult : ILogicResult<object>;
+
+public readonly struct LogicResult<TResult, TError> : ILogicResult<TResult, TError> {
+    
+    public TResult? Result { get; init; }
+    public TError? Error { get; init; }
+    
+    public bool IsSuccessful => Result is not null && Error is null;
+
+    public static implicit operator LogicResult<TResult, TError>(TResult result) {
+        return new LogicResult<TResult, TError> {
+            Result = result
+        };
+    }
+
+    public static implicit operator LogicResult<TResult, TError>(TError error) {
+        return new LogicResult<TResult, TError> {
+            Error = error
+        };
+    }
+    
+    public IResult MapResult() {
+        if (!IsSuccessful)
+            return Microsoft.AspNetCore.Http.Results.Problem();
+        
+        return Microsoft.AspNetCore.Http.Results.Ok(Result);
+    }
+    
+}
+
+public readonly struct LogicResult<TResult> : ILogicResult<TResult> {
+    
+    public TResult? Result { get; init; }
+    public IResult? Error { get; init; }
+    
+    public bool IsSuccessful => Error is null;
+    
+    public static implicit operator LogicResult<TResult>(TResult result) {
+        return new LogicResult<TResult> {
+            Result = result
+        };
+    }
+
+    public LogicResult() { }
+
+    public LogicResult(IResult error) {
+        Error = error;
+    }
+
+    public IResult MapResult() {
+        if (!IsSuccessful) {
+            return Error!;
+        }
+
+        return Microsoft.AspNetCore.Http.Results.Ok(Result);
+    }
+    
+}
+
+public readonly struct LogicResult : ILogicResult {
+    
+    public object? Result { get; init; }
+    public IResult? Error { get; init; }
+    
+    public bool IsSuccessful => Error is null;
+    
+    public LogicResult() { }
+
+    public LogicResult(IResult error) {
+        Error = error;
+    }
+    
+    public IResult MapResult() {
+        if (!IsSuccessful) {
+            return Error!;
+        }
+
+        return Microsoft.AspNetCore.Http.Results.Ok(Result);
+    }
+}

src/WorkTime.Shared/Models/TimeEntry.cs

@@ -0,0 +1,24 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace WorkTime.Shared.Models;
+
+public class TimeEntry {
+    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+    public int Id { get; set; }
+
+    public required Guid Owner { get; set; }
+
+    public required TimeEntryType Type { get; set; }
+
+    public DateTime Timestamp { get; set; } = DateTime.Now;
+
+    public bool IsMoba { get; set; }
+}
+
+public enum TimeEntryType {
+    Login,
+    Logout,
+    LoginDrive,
+    LogoutDrive
+}

src/WorkTime.Shared/Repositories/IEntryRepository.cs

@@ -0,0 +1,17 @@
+using WorkTime.Shared.Models;
+
+namespace WorkTime.Shared.Repositories;
+
+public interface IEntryRepository {
+
+    Task<TimeEntry[]> GetAllEntries(Guid owner);
+
+    Task<TimeEntry[]> GetEntries(Guid owner, DateOnly date);
+
+    Task<TimeEntry?> GetEntry(int id);
+
+    Task AddEntry(TimeEntry entry);
+
+    Task DeleteEntry(TimeEntry entry);
+
+}

src/WorkTime.Shared/Services/IAuthService.cs

@@ -0,0 +1,11 @@
+namespace WorkTime.Shared.Services;
+
+public interface IAuthService {
+
+    public const string HeaderName = "Authentication";
+
+    public Task<bool> IsAuthenticated();
+
+    public Task<Guid> GetCurrentUserId();
+
+}

src/WorkTime.Shared/WorkTime.Shared.csproj

@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.2" />
+    </ItemGroup>
+
+</Project>