Connections API | GET connections/users & Connections API | GET /resource/instances/users

src/apps/Altinn.AccessManagement/src/Altinn.AccessManagement.Api.Enduser/Controllers/ConnectionsController.cs

@@ -89,6 +89,45 @@ public async Task<IActionResult> GetConnections(
         return Ok(PaginatedResult.Create(result.Value, null));
     }
 
+    /// <summary>
+    /// Gets all available users who already have some access from the specified party and are available to receive new delegations.
+    /// </summary>
+    [HttpGet("users")]
+    [Authorize(Policy = AuthzConstants.POLICY_INSTANCE_DELEGATION)]
+    [ProducesResponseType<PaginatedResult<SimplifiedConnectionDto>>(StatusCodes.Status200OK, MediaTypeNames.Application.Json)]
+    [ProducesResponseType<AltinnProblemDetails>(StatusCodes.Status400BadRequest, MediaTypeNames.Application.Json)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    public async Task<IActionResult> GetAvailableUsers(
+        [Required][FromQuery(Name = "party")] Guid party,
+        [FromQuery, FromHeader] PagingInput paging,
+        CancellationToken cancellationToken = default)
+    {
+        var validationErrors = ValidationComposer.Validate(ConnectionValidation.ValidateReadConnection(party.ToString(), party.ToString(), null));
+        if (validationErrors is { })
+        {
+            return validationErrors.ToActionResult();
+        }
+
+        var result = await ConnectionService.Get(
+            party,
+            party,
+            null,
+            includeClientDelegations: true,
+            includeAgentConnections: true,
+            ConfigureConnections,
+            cancellationToken
+        );
+
+        if (result.IsProblem)
+        {
+            return result.Problem.ToActionResult();
+        }
+
+        var simplifiedConnections = DtoMapper.ToSimplifiedConnections(result.Value);
+        return Ok(PaginatedResult.Create(simplifiedConnections, null));
+    }
+
     #region Assignment
 
     /// <summary>
@@ -1072,5 +1111,61 @@ public async Task<IActionResult> CheckInstance(
         return Ok(result.Value);
     }
 
+    /// <summary>
+    /// Gets all users who have access to a specific instance.
+    /// </summary>
+    [HttpGet("resources/instances/users")]
+    [Authorize(Policy = AuthzConstants.POLICY_INSTANCE_DELEGATION)]
+    [ProducesResponseType<PaginatedResult<SimplifiedPartyDto>>(StatusCodes.Status200OK, MediaTypeNames.Application.Json)]
+    [ProducesResponseType<AltinnProblemDetails>(StatusCodes.Status400BadRequest, MediaTypeNames.Application.Json)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    public async Task<IActionResult> GetInstanceUsers(
+        [Required][FromQuery(Name = "party")] Guid party,
+        [Required][FromQuery(Name = "resource")] string resource,
+        [Required][FromQuery(Name = "instance")] string instance,
+        [FromQuery, FromHeader] PagingInput paging,
+        CancellationToken cancellationToken = default)
+    {
+        var validationErrors = ValidationComposer.Validate(ParameterValidation.InstanceUrn(instance));
+        if (validationErrors is { })
+        {
+            return validationErrors.ToActionResult();
+        }
+
+        var resourceObj = await resourceService.GetResource(resource, cancellationToken);
+        if (resourceObj is null)
+        {
+            ProblemDetails problem = Core.Errors.Problems.InvalidResource.ToProblemDetails();
+            problem.Extensions["resource"] = resource;
+            problem.Extensions["instance"] = instance;
+            return problem.ToActionResult();
+        }
+
+        var result = await ConnectionService.GetResourceInstances(
+            party,
+            fromId: party,
+            toId: null,
+            resourceId: resourceObj.Id,
+            instanceId: instance,
+            configureConnections: ConfigureConnections,
+            cancellationToken: cancellationToken
+        );
+
+        if (result.IsProblem)
+        {
+            return result.Problem.ToActionResult();
+        }
+
+        var users = result.Value
+            .SelectMany(inst => inst.Permissions ?? Enumerable.Empty<PermissionDto>())
+            .Where(perm => perm.To != null)
+            .Select(perm => DtoMapper.ToSimplifiedParty(perm.To))
+            .DistinctBy(p => p.Id)
+            .ToList();
+
+        return Ok(PaginatedResult.Create(users, null));
+    }
+
     #endregion
 }

src/apps/Altinn.AccessManagement/src/Altinn.AccessMgmt.Core/Utils/Mappers/DtoMapper.Simplified.cs

@@ -0,0 +1,64 @@
+using Altinn.AccessMgmt.PersistenceEF.Models;
+using Altinn.Authorization.Api.Contracts.AccessManagement;
+
+namespace Altinn.AccessMgmt.Core.Utils;
+
+/// <summary>
+/// Mapper extension for simplified connections
+/// </summary>
+public partial class DtoMapper
+{
+    /// <summary>
+    /// Converts a CompactEntityDto to SimplifiedPartyDto, excluding sensitive personal information
+    /// </summary>
+    /// <param name="entity">The entity to convert</param>
+    /// <returns>A simplified party DTO without PersonIdentifier/SSN, or null if entity is null</returns>
+    /// <remarks>This method explicitly excludes PersonIdentifier to comply with data privacy requirements</remarks>
+    public static SimplifiedPartyDto? ToSimplifiedParty(CompactEntityDto? entity)
+    {
+        if (entity is null)
+        {
+            return null;
+        }
+
+        return new SimplifiedPartyDto
+        {
+            Id = entity.Id,
+            Name = entity.Name,
+            Type = entity.Type,
+            Variant = entity.Variant,
+            OrganizationIdentifier = entity.OrganizationIdentifier,
+            IsDeleted = entity.IsDeleted,
+            DeletedAt = entity.DeletedAt
+        };
+    }
+
+    /// <summary>
+    /// Converts a ConnectionDto to SimplifiedConnectionDto
+    /// </summary>
+    /// <param name="connection">The connection to convert</param>
+    /// <returns>A simplified connection DTO, or null if connection is null</returns>
+    public static SimplifiedConnectionDto? ToSimplifiedConnection(ConnectionDto? connection)
+    {
+        if (connection is null)
+        {
+            return null;
+        }
+
+        return new SimplifiedConnectionDto
+        {
+            Party = ToSimplifiedParty(connection.Party),
+            Connections = connection.Connections?.Select(ToSimplifiedConnection).ToList() ?? []
+        };
+    }
+
+    /// <summary>
+    /// Converts a collection of ConnectionDto to simplified connections
+    /// </summary>
+    /// <param name="connections">The connections to convert</param>
+    /// <returns>A collection of simplified connection DTOs</returns>
+    public static IEnumerable<SimplifiedConnectionDto> ToSimplifiedConnections(IEnumerable<ConnectionDto>? connections)
+    {
+        return connections?.Select(ToSimplifiedConnection) ?? Enumerable.Empty<SimplifiedConnectionDto>();
+    }
+}

src/libs/Altinn.Authorization.Api.Contracts/src/Altinn.Authorization.Api.Contracts/AccessManagement/SimplifiedConnectionDto.cs

@@ -0,0 +1,21 @@
+using System.Text.Json.Serialization;
+
+namespace Altinn.Authorization.Api.Contracts.AccessManagement;
+
+/// <summary>
+/// Simplified connection for listing available users
+/// </summary>
+public class SimplifiedConnectionDto
+{
+    /// <summary>
+    /// The party information
+    /// </summary>
+    [JsonPropertyName("party")]
+    public SimplifiedPartyDto Party { get; set; }
+
+    /// <summary>
+    /// Sub-connections (nested users under this party)
+    /// </summary>
+    [JsonPropertyName("connections")]
+    public List<SimplifiedConnectionDto> Connections { get; set; } = new();
+}

src/libs/Altinn.Authorization.Api.Contracts/src/Altinn.Authorization.Api.Contracts/AccessManagement/SimplifiedPartyDto.cs

@@ -0,0 +1,51 @@
+using System.Text.Json.Serialization;
+
+namespace Altinn.Authorization.Api.Contracts.AccessManagement;
+
+/// <summary>
+/// Simplified party information for connections API responses
+/// </summary>
+public class SimplifiedPartyDto
+{
+    /// <summary>
+    /// The unique identifier for the party
+    /// </summary>
+    [JsonPropertyName("id")]
+    public Guid Id { get; set; }
+
+    /// <summary>
+    /// The name of the party
+    /// </summary>
+    [JsonPropertyName("name")]
+    public string Name { get; set; }
+
+    /// <summary>
+    /// The type of party (Person, Organization, etc.)
+    /// </summary>
+    [JsonPropertyName("type")]
+    public string Type { get; set; }
+
+    /// <summary>
+    /// The variant/subtype of the party
+    /// </summary>
+    [JsonPropertyName("variant")]
+    public string Variant { get; set; }
+
+    /// <summary>
+    /// Organization number (only for organizations)
+    /// </summary>
+    [JsonPropertyName("organizationIdentifier")]
+    public string? OrganizationIdentifier { get; set; }
+
+    /// <summary>
+    /// Indicates if the party is deleted
+    /// </summary>
+    [JsonPropertyName("isDeleted")]
+    public bool IsDeleted { get; set; }
+
+    /// <summary>
+    /// The timestamp when the party was deleted
+    /// </summary>
+    [JsonPropertyName("deletedAt")]
+    public DateTimeOffset? DeletedAt { get; set; }
+}