feat: added implementation of HeadHunter hook for user registration

JOBot.Backend/Services/HeadHunterService.cs

@@ -0,0 +1,106 @@
+using System.Text.Json;
+using JOBot.Backend.DAL.Context;
+using JOBot.Backend.DTOs.HeadHunterHook;
+using JOBot.Backend.Infrastructure.Config;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
+
+namespace JOBot.Backend.Services;
+
+public class HeadHunterService(ILogger<HeadHunterService> logger, IOptions<HeadHunterConfig> config, AppDbContext dbContext)
+{
+    private readonly HeadHunterConfig _config = config.Value;
+
+    /// <summary>
+    /// Generate HeadHunter oauth authorization link
+    /// </summary>
+    /// <param name="userId">Telegram UserId</param>
+    /// <returns>Link for auth</returns>
+    public string GenerateAuthLink(int userId)
+    {
+        var redirectUri = new UriBuilder(_config.Links.HookDomain)
+        {
+            Port = -1,
+            Scheme = "https",
+            Path = _config.Links.HookRoute,
+            Query = $"?userId={userId}"
+        }.ToString();
+        
+        return string.Format(_config.Links.AuthLink, [_config.ClientId, userId, redirectUri]);
+    }
+
+    public async Task<Status> AuthUser(int userId, string authorizationCode, string? error)
+    {
+        logger.LogInformation($"Authorization for user {userId} in process...");
+        
+        if (!string.IsNullOrEmpty(error))
+        {
+            logger.LogWarning($"User {userId} auth completed with error {error}");
+            return Status.UserAuthRejectedError;
+        }
+
+        using var client = new HttpClient();
+        var form = new Dictionary<string, string>
+        {
+            { "client-id", _config.ClientId },
+            { "client_secret", _config.Secret },
+            { "code", authorizationCode },
+            { "grant_type", "authorization_code" }
+        };
+        client.BaseAddress = new UriBuilder(_config.Links.HeadHunterApiDomain)
+        {
+            Port = -1,
+            Scheme = "https"
+        }.Uri;
+        client.DefaultRequestHeaders.UserAgent.ParseAdd("Jobot BackEnd Service");
+
+        using var res = await client.SendAsync(
+            new HttpRequestMessage(
+                HttpMethod.Post,
+                _config.Links.HeadHunterTokenRoute)
+            {
+                Content = new FormUrlEncodedContent(form)
+            });
+
+        if (!res.IsSuccessStatusCode)
+        {
+            logger.LogWarning($"Response of HttpRequest ${_config.Links.HeadHunterApiDomain} " +
+                              $"${_config.Links.HeadHunterTokenRoute} has unsuccessful status code {res.StatusCode}");
+            return Status.HeadHunterAuthRejectedError;
+        }
+        
+        var responseDto = JsonSerializer.Deserialize<HeadHunterTokenResponseDto>(await res.Content.ReadAsStringAsync());
+
+        if (responseDto == null)
+        {
+            logger.LogWarning($"User {userId} auth completed with error " +
+                              $"{nameof(Status.HeadHunterResponseDeserializationFailedError)}");
+            return Status.HeadHunterResponseDeserializationFailedError;
+        }
+        
+        var user = await dbContext.Users.FirstOrDefaultAsync(x => x.UserId == userId);
+
+        if (user == null)
+        {
+            logger.LogWarning($"User {userId} search completed with error {nameof(Status.UserNotFoundError)}");
+            return Status.UserNotFoundError;
+        }
+        
+        user.AccessToken = responseDto.AccessToken;
+        user.RefreshToken = responseDto.RefreshToken;
+        
+        await dbContext.SaveChangesAsync();
+        
+        logger.LogInformation($"User {userId} auth completed!");
+        return Status.Success;
+    }
+
+    public enum Status
+    {
+        UserAuthRejectedError,
+        HeadHunterAuthRejectedError,
+        UserNotFoundError,
+        HeadHunterResponseDeserializationFailedError,
+        Success
+    }
+}