src/Connected.Common.Workspace/Connected.Common.Workspace.Model.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="Events\" />
+    <Folder Include="Documents\" />
+    <Folder Include="Notifications\" />
+    <Folder Include="Tasks\" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\connected.framework\src\Connected.Entities\Connected.Entities.csproj" />
+  </ItemGroup>
+
+</Project>

src/Connected.Common.Workspace/IWorkspaceEntity.cs

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+using Connected.Common.Workspace.Messaging;
+using Connected.Entities.Consistency;
+using Connected.Security.Identity;
+
+namespace Connected.Common.Workspace;
+/// <summary>
+/// Specifies the read state of the <see cref="IWorkspaceEntity"/> entity.
+/// </summary>
+public enum ReadStatus
+{
+	/// <summary>
+	/// The entity has not been read by the <see cref="IWorkspaceEntity.IdentityId"/>.
+	/// </summary>
+	New = 0,
+	/// <summary>
+	/// The entity has been read by the <see cref="IWorkspaceEntity.IdentityId"/>.
+	/// </summary>
+	Read = 1
+}
+/// <summary>
+/// Specifies what kind of actions can be performed by the identity on each <see cref="IWorkspaceEntity"/> entity.
+/// </summary>
+[Flags]
+public enum IdentityVerbs
+{
+	/// <summary>
+	/// The entity is read only. Identity cannot perform any actions on it 
+	/// except reading.
+	/// </summary>
+	ReadOnly = 0,
+	/// <summary>
+	/// The entity can be deleted from the workspace by the identity.
+	/// </summary>
+	AllowDelete = 1
+}
+/// <summary>
+/// Represents a base entity for all workspace related entities.
+/// </summary>
+/// <remarks>
+/// Digital Workspace offers many different services serving different purposes. Each service introduces
+/// its own set of entities. All top level entities inherits from this entity, for example <see cref="IMessage"/>.
+/// </remarks>
+public interface IWorkspaceEntity : IConsistentEntity<long>
+{
+	/// <summary>
+	/// The type of identity to which workspace entity belongs to (like Recipient).
+	/// </summary>
+	/// <remarks>
+	/// The most common type of the identity entity is <see cref="IUser"/>.
+	/// </remarks>
+	string IdentityEntity { get; init; }
+	/// <summary>
+	/// The id of the identity to which workspace entity belongs. This could be the id of the user,
+	/// device, organization unit or any other entity id. 
+	/// </summary>
+	string IdentityId { get; init; }
+	/// <summary>
+	/// The date and time the workspace entity has been created.
+	/// </summary>
+	/// <remarks>
+	/// This value can represent the value when the origin entity has been created or when
+	/// the workspace entity has been created. This value is specific to the service implementation.
+	/// </remarks>
+	DateTimeOffset Created { get; init; }
+	/// <summary>
+	/// The date and time the workspace entity expires.
+	/// </summary>
+	/// <remarks>
+	/// Expired workspace entities are automatically deleted from the system. If this value is <c>null</c>,
+	/// workspace entity never expires.
+	/// </remarks>
+	DateTimeOffset? Expires { get; init; }
+	/// <summary>
+	/// The title of the entity.
+	/// </summary>
+	/// <remarks>
+	/// This should be as short as possible so user can quickly recognize the nature of the entity.
+	/// </remarks>
+	string Title { get; init; }
+	/// <summary>
+	/// The short description of the entity. Can be <c>null</c>.
+	/// </summary>
+	string? Description { get; init; }
+	/// <summary>
+	/// The read status of the entity. This serves primary for a UI purpose to enable visual feedback
+	/// to the user.
+	/// </summary>
+	ReadStatus Status { get; init; }
+	/// <summary>
+	/// The domain to which this entity belongs.
+	/// </summary>
+	/// <remarks>
+	/// Each workspace entity should have one and only one domain to which it originates.
+	/// </remarks>
+	string Domain { get; init; }
+	/// <summary>
+	/// Zero or more tags that represents additional meta data of the workspace entity.
+	/// </summary>
+	string? Tags { get; init; }
+	/// <summary>
+	/// The entity which triggered this workspace entity to be created. Can be <c>null</c> if it was
+	/// automatically generated by the underlying system.
+	/// </summary>
+	string? AuthorEntity { get; init; }
+	/// <summary>
+	/// The id of the entity which created this workspace entity. Can be <c>null</c> if it was
+	/// automatically generated by the underlying system.
+	/// </summary>
+	string? AuthorId { get; init; }
+	/// <summary>
+	/// Actions that can be performed by the identity on the workspace entity.
+	/// </summary>
+	IdentityVerbs Verbs { get; init; }
+}

src/Connected.Common.Workspace/Identities/IIdentity.cs

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+using Connected.Data;
+
+namespace Connected.Common.Workspace.Identities;
+/// <summary>
+/// Represents the workspace identity.
+/// </summary>
+/// <remarks>
+/// Workspace supports identities through the <see cref="IIdentityService"/>. There could
+/// be any number of different identities, such as users or devices which are provided via
+/// different identity providers.
+/// </remarks>
+public interface IIdentity : IPrimaryKey<string>
+{
+	/// <summary>
+	/// The display name of the identity. This should be short and descriptive.
+	/// </summary>
+	string DisplayName { get; init; }
+	/// <summary>
+	/// The Url of the identity's avatar if it is supported.
+	/// </summary>
+	string Avatar { get; init; }
+}

src/Connected.Common.Workspace/Identities/IIdentityService.cs

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+using System.Collections.Immutable;
+
+namespace Connected.Common.Workspace.Identities;
+/// <summary>
+/// The provider service used for providing identity descriptors.
+/// </summary>
+public interface IIdentityService
+{
+	/// <summary>
+	/// Queries identities for the specified set of entity types and their ids.
+	/// </summary>
+	/// <param name="args">The arguments containing entity types and their ids.</param>
+	/// <returns>The list of identities that matches the specified criteria.</returns>
+	Task<ImmutableList<IIdentity>> Query(QueryIdentitiesArgs args);
+}

src/Connected.Common.Workspace/Identities/IdentityArgs.cs

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+using Connected.Annotations;
+using Connected.ServiceModel;
+
+namespace Connected.Common.Workspace.Identities;
+public sealed class QueryIdentitiesArgs : QueryArgs
+{
+	[NonDefault]
+	public Dictionary<string, string> Items { get; set; } = default!;
+}

src/Connected.Common.Workspace/Messaging/IMessage.cs

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+namespace Connected.Common.Workspace.Messaging;
+public interface IMessage : IWorkspaceEntity
+{
+
+}

src/Connected.Common.Workspace/Messaging/IMessagesService.cs

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+using System.Collections.Immutable;
+using Connected.Notifications;
+using Connected.ServiceModel;
+
+namespace Connected.Common.Workspace.Messaging;
+public interface IMessagesService : IServiceNotifications<long>
+{
+	Task<ImmutableList<IMessage>> Query(QueryMessageArgs args);
+	Task<IMessage?> Select(PrimaryKeyArgs<long> args);
+
+	Task<long> Insert(InsertMessageArgs args);
+	Task Update(UpdateMessageArgs args);
+	Task Patch(PatchArgs<long> args);
+	Task Delete(PrimaryKeyArgs<long> args);
+}

src/Connected.Common.Workspace/Messaging/MessageArgs.cs

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+using System.ComponentModel.DataAnnotations;
+using Connected.ServiceModel;
+
+namespace Connected.Common.Workspace.Messaging;
+public sealed class QueryMessageArgs : QueryArgs
+{
+	[Required, MaxLength(128)]
+	public string IdentityEntity { get; set; } = default!;
+	[Required, MaxLength(128)]
+	public string IdentityId { get; set; } = default!;
+}
+
+public sealed class InsertMessageArgs : InsertWorkspaceArgs
+{
+
+}
+
+public sealed class UpdateMessageArgs : UpdateWorkspaceArgs
+{
+
+}

src/Connected.Common.Workspace/WorkspaceArgs.cs

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+using System.ComponentModel.DataAnnotations;
+using Connected.ServiceModel;
+
+namespace Connected.Common.Workspace;
+/// <summary>
+/// The base class for the arguments used when inserting one of the
+/// implementations of the <see cref="IWorkspaceEntity"/> entity.
+/// </summary>
+public abstract class InsertWorkspaceArgs : Dto
+{
+	/// <inheritdoc cref="IWorkspaceEntity.IdentityEntity"/>
+	[Required, MaxLength(128)]
+	public string IdentityEntity { get; set; } = default!;
+	/// <inheritdoc cref="IWorkspaceEntity.IdentityId"/>
+	[Required, MaxLength(128)]
+	public string IdentityId { get; set; } = default!;
+	/// <inheritdoc cref="IWorkspaceEntity.Created"/>
+	public DateTimeOffset? Created { get; set; }
+	/// <inheritdoc cref="IWorkspaceEntity.Expires"/>
+	public DateTimeOffset? Expires { get; set; }
+	/// <inheritdoc cref="IWorkspaceEntity.Title"/>
+	[Required, MaxLength(128)]
+	public string Title { get; set; } = default!;
+	/// <inheritdoc cref="IWorkspaceEntity.Description"/>
+	[MaxLength(256)]
+	public string? Description { get; set; }
+	/// <inheritdoc cref="IWorkspaceEntity.Status"/>
+	public ReadStatus? Status { get; set; }
+	/// <inheritdoc cref="IWorkspaceEntity.Domain"/>
+	[Required, MaxLength(128)]
+	public string Domain { get; init; } = default!;
+	/// <inheritdoc cref="IWorkspaceEntity.Tags"/>
+	[MaxLength(256)]
+	public string? Tags { get; init; }
+	/// <inheritdoc cref="IWorkspaceEntity.AuthorEntity"/>
+	[MaxLength(128)]
+	public string? AuthorEntity { get; init; }
+	/// <inheritdoc cref="IWorkspaceEntity.AuthorId"/>
+	[MaxLength(128)]
+	public string? AuthorId { get; init; }
+	/// <inheritdoc cref="IWorkspaceEntity.Verbs"/>
+	public IdentityVerbs? Verbs { get; init; }
+}
+/// <summary>
+/// The base class used when updating one of the
+/// implementations of the <see cref="IWorkspaceEntity"/> entity.
+/// </summary>
+public abstract class UpdateWorkspaceArgs : PrimaryKeyArgs<long>
+{
+	/// <inheritdoc cref="IWorkspaceEntity.Created"/>
+	public DateTimeOffset? Created { get; set; }
+	/// <inheritdoc cref="IWorkspaceEntity.Expires"/>
+	public DateTimeOffset? Expires { get; set; }
+	/// <inheritdoc cref="IWorkspaceEntity.Title"/>
+	[Required, MaxLength(128)]
+	public string Title { get; set; } = default!;
+	/// <inheritdoc cref="IWorkspaceEntity.Description"/>
+	[MaxLength(256)]
+	public string? Description { get; set; }
+	/// <inheritdoc cref="IWorkspaceEntity.Status"/>
+	public ReadStatus? Status { get; set; }
+	/// <inheritdoc cref="IWorkspaceEntity.Tags"/>
+	[MaxLength(256)]
+	public string? Tags { get; init; }
+	/// <inheritdoc cref="IWorkspaceEntity.Verbs"/>
+	public IdentityVerbs? Verbs { get; init; }
+}