feat: add first volunteer skill endpoint (add_skill) along with dtos

WebApp/DTOs/SingleSkillDto.cs

@@ -0,0 +1,8 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace WebApp.DTOs;
+
+public record class SingleSkillDto
+(
+    [Required] int Skill
+);

WebApp/DTOs/SkillSummaryDto.cs

@@ -0,0 +1,9 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace WebApp.DTOs;
+
+public record class SkillSummaryDto
+(
+    [Required] int SkillId,
+    [Required] string SkillName
+);

WebApp/Endpoints/AuthEndpoints.cs

@@ -1,5 +1,6 @@
 using Microsoft.AspNetCore.Http.HttpResults;
 using Microsoft.EntityFrameworkCore;
+using System.Runtime.Intrinsics.Arm;
 using System.Security.Cryptography;
 using System.Text;
 using WebApp.Data;
@@ -123,6 +124,42 @@ namespace WebApp.Endpoints
 
             });
 
+            group.MapPost("/add_skill", async (SingleSkillDto dto, HttpContext httpContext, ApplicationDbContext context, GeneralUseHelpers guh) =>
+            {
+                // Uzyskaj użytkownika z tokenu
+                Token? token = await guh.GetTokenFromHTTPContext(httpContext);
+                User? user = await guh.GetUserFromToken(token);
+
+                // Tylko wolontariusze powinno móc dodawać swoje skille
+                if (user == null || user.IsOrganisation) {
+                    return Results.Json(new { message = "Unauthorized" }, statusCode: 401);
+                }
+
+                // Szukamy skilla w bazie o ID takim, jak w otrzymanym DTO
+                Skill? skill = await context.Skills.FindAsync(dto.Skill);
+                if (skill is null)
+                {
+                    return Results.Json(new { message = "Skill not found" }, statusCode: 404);
+                }
+
+                // Sprawdzamy, czy ten użytkownik nie ma już takiego skilla. Jeżeli ma, nie ma sensu dodawać go kilkukrotnie.
+                VolunteerSkill? vs = await context.VolunteerSkills.FirstOrDefaultAsync(v => v.UserId == user.UserId && v.SkillId == dto.Skill);
+                if (vs is null)
+                {
+                    // Nie ma - zatem musimy dodać nowy VolunteerSkill do bazy
+                    VolunteerSkill newVs = dto.ToVolunteerSkillEntity(user.UserId);
+                    context.VolunteerSkills.Add(newVs);
+                    await context.SaveChangesAsync();
+
+                } else
+                {
+                    // Ma - (ta para UserId <-> SkillId już istnieje w bazie) użytkownik już ma ten skill
+                    return Results.Json(new { message = "User already has this skill" }, statusCode: 400);
+                }
+
+                return Results.Json(new { message = "Skill added successfully!" }, statusCode: 201);
+            });
+
             return group;
         }
         

WebApp/Mapping/SkillMapping.cs

@@ -0,0 +1,25 @@
+using WebApp.DTOs;
+using WebApp.Entities;
+
+namespace WebApp.Mapping
+{
+    public static class SkillMapping
+    {
+        public static Skill ToSkillEntity(this SingleSkillDto SSDto, string name)
+        {
+            return new Skill()
+            {
+                SkillId = SSDto.Skill,
+                Name = name
+            };
+        }
+
+        public static SkillSummaryDto ToSkillSummaryDto(this Skill s)
+        {
+            return new SkillSummaryDto(
+                s.SkillId,
+                s.Name
+            );
+        }
+    }
+}

WebApp/Mapping/VolunteerSkillMapping.cs

@@ -0,0 +1,17 @@
+using WebApp.DTOs;
+using WebApp.Entities;
+
+namespace WebApp.Mapping
+{
+    public static class VolunteerSkillMapping
+    {
+        public static VolunteerSkill ToVolunteerSkillEntity(this SingleSkillDto SSDto, int uid)
+        {
+            return new VolunteerSkill()
+            {
+                UserId = uid,
+                SkillId = SSDto.Skill,
+            };
+        }
+    }
+}