Implement identity verification feature with image upload and token management

FoodsharingSiegen.Server/Data/Service/ProspectService.cs

@@ -111,7 +111,10 @@ namespace FoodsharingSiegen.Server.Data.Service
         {
             try
             {
-                var prospectsQuery = Context.Prospects!.AsNoTracking().Include(x => x.Interactions.OrderBy(i => i.Date)).ThenInclude(x => x.User).OrderBy(x => x.Name).AsQueryable();
+                var prospectsQuery = Context.Prospects!.AsNoTracking()
+                    .Include(x => x.Images)
+                    .Include(x => x.Interactions.OrderBy(i => i.Date)).ThenInclude(x => x.User)
+                    .OrderBy(x => x.Name).AsQueryable();
                 
                 if(parameter.MustHaveInteractions != null && parameter.MustHaveInteractions.Any()) 
                     prospectsQuery = prospectsQuery.Where(x => x.Interactions.Any(i => parameter.MustHaveInteractions.Contains(i.Type)));
@@ -206,5 +209,138 @@ namespace FoodsharingSiegen.Server.Data.Service
         }
 
         #endregion
+
+        #region Image Upload Features
+
+        public async Task<OperationResult<Guid>> GenerateVerificationTokenAsync(Guid prospectId)
+        {
+            try
+            {
+                var prospect = await Context.Prospects!
+                    .Include(x => x.Interactions)
+                    .FirstOrDefaultAsync(x => x.Id == prospectId);
+                
+                if (prospect == null) return new(new Exception("Prospect not found"));
+
+                if (prospect.Interactions.Any(x => x.Type == InteractionType.Verify))
+                    return new(new Exception("Die Identitätsprüfung wurde bereits abgeschlossen. Es kann kein neuer Token generiert werden."));
+
+                prospect.VerificationToken = Guid.NewGuid();
+                prospect.Modified = DateTime.UtcNow;
+
+                await Context.SaveChangesAsync();
+                return new(prospect.VerificationToken.Value);
+            }
+            catch (Exception e)
+            {
+                return new(e);
+            }
+        }
+
+        public async Task<OperationResult<Prospect>> GetProspectByVerificationTokenAsync(Guid token)
+        {
+            try
+            {
+                var prospect = await Context.Prospects!
+                    .Include(x => x.Interactions)
+                    .AsNoTracking()
+                    .FirstOrDefaultAsync(x => x.VerificationToken == token);
+                
+                if (prospect == null) return new(new Exception("Ungültiger oder abgelaufener Token."));
+                
+                if (prospect.Interactions.Any(x => x.Type == InteractionType.Verify))
+                    return new(new Exception("Die Identitätsprüfung wurde bereits abgeschlossen. Ein Hochladen weiterer Bilder ist nicht mehr möglich."));
+
+                return new(prospect);
+            }
+            catch (Exception e)
+            {
+                return new(e);
+            }
+        }
+
+        public async Task<OperationResult> AddVerificationImageAsync(Guid prospectId, byte[] imageData, string contentType)
+        {
+            try
+            {
+                var prospect = await Context.Prospects!
+                    .Include(x => x.Interactions)
+                    .AsNoTracking()
+                    .FirstOrDefaultAsync(x => x.Id == prospectId);
+
+                if (prospect == null) return new(new Exception("Foodsaver nicht gefunden."));
+                
+                if (prospect.Interactions.Any(x => x.Type == InteractionType.Verify))
+                    return new(new Exception("Die Identitätsprüfung wurde bereits abgeschlossen. Ein Hochladen weiterer Bilder ist nicht mehr möglich."));
+
+                // Verify max 5 images
+                var imgCount = await Context.ProspectImages!.CountAsync(x => x.ProspectId == prospectId);
+                if (imgCount >= 5) return new(new Exception("Maximum 5 images allowed"));
+
+                var image = new ProspectImage
+                {
+                    Id = Guid.NewGuid(),
+                    ProspectId = prospectId,
+                    ImageData = imageData,
+                    ContentType = contentType,
+                    Created = DateTime.UtcNow
+                };
+
+                await Context.ProspectImages!.AddAsync(image);
+                await Context.SaveChangesAsync();
+
+                return new();
+            }
+            catch (Exception e)
+            {
+                return new(e);
+            }
+        }
+
+        public async Task<OperationResult<List<ProspectImage>>> GetVerificationImagesAsync(Guid prospectId)
+        {
+            try
+            {
+                var images = await Context.ProspectImages!
+                    .AsNoTracking()
+                    .Where(x => x.ProspectId == prospectId)
+                    .OrderBy(x => x.Created)
+                    .ToListAsync();
+
+                return new(images);
+            }
+            catch (Exception e)
+            {
+                return new(e);
+            }
+        }
+
+        public async Task<OperationResult> DeleteVerificationImagesAsync(Guid prospectId)
+        {
+            try
+            {
+                var images = await Context.ProspectImages!.Where(x => x.ProspectId == prospectId).ToListAsync();
+                if (images.Any())
+                {
+                    Context.ProspectImages!.RemoveRange(images);
+                    
+                    var prospect = await Context.Prospects!.FirstOrDefaultAsync(x => x.Id == prospectId);
+                    if (prospect != null)
+                    {
+                        prospect.VerificationToken = null; // Clear token when images are deleted
+                    }
+
+                    await Context.SaveChangesAsync();
+                }
+
+                return new();
+            }
+            catch (Exception e)
+            {
+                return new(e);
+            }
+        }
+
+        #endregion
     }
 }