cesnimda
81 lines
4.5 KiB
C#
81 lines
4.5 KiB
C#
using System.Net.Http.Headers;
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using System.Text.Json;
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using JobTrackerApi.Models;
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using Microsoft.Extensions.Caching.Memory;
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namespace JobTrackerApi.Services;
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public interface IJobDiscoverySearchService
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{
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Task<IReadOnlyList<DiscoveredJob>> SearchAsync(string? query, string? location, CancellationToken cancellationToken);
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}
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public sealed class NavJobDiscoverySearchService(
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IHttpClientFactory clients,
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IConfiguration configuration,
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IMemoryCache cache,
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TimeProvider timeProvider) : IJobDiscoverySearchService
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{
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private const string BaseUrl = "https://pam-stilling-feed.nav.no";
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public async Task<IReadOnlyList<DiscoveredJob>> SearchAsync(string? query, string? location, CancellationToken cancellationToken)
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{
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var retrievedAt = timeProvider.GetUtcNow();
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var token = await GetTokenAsync(cancellationToken);
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var client = clients.CreateClient();
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var entries = new Dictionary<string, DiscoveredJob>(StringComparer.OrdinalIgnoreCase);
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var next = "/api/v1/feed";
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for (var page = 0; page < 20 && !string.IsNullOrWhiteSpace(next); page++)
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{
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using var request = new HttpRequestMessage(HttpMethod.Get, BaseUrl + next);
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request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);
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request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
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if (page == 0) request.Headers.IfModifiedSince = timeProvider.GetUtcNow().AddDays(-14);
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using var response = await client.SendAsync(request, cancellationToken);
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response.EnsureSuccessStatusCode();
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using var json = JsonDocument.Parse(await response.Content.ReadAsStreamAsync(cancellationToken));
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next = json.RootElement.TryGetProperty("next_url", out var nextElement) ? nextElement.GetString() ?? "" : "";
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foreach (var item in json.RootElement.GetProperty("items").EnumerateArray())
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{
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var feed = item.GetProperty("_feed_entry");
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var jobId = feed.GetProperty("uuid").GetString();
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if (string.IsNullOrWhiteSpace(jobId)) continue;
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var status = feed.TryGetProperty("status", out var statusElement) ? statusElement.GetString() : null;
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if (!string.Equals(status, "ACTIVE", StringComparison.OrdinalIgnoreCase)) { entries.Remove(jobId); continue; }
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entries[jobId] = new DiscoveredJob(jobId,
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feed.TryGetProperty("title", out var title) ? title.GetString() ?? "" : "",
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feed.TryGetProperty("businessName", out var company) ? company.GetString() : null,
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feed.TryGetProperty("municipal", out var municipal) ? municipal.GetString() : null,
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item.TryGetProperty("date_modified", out var modified) && modified.TryGetDateTimeOffset(out var date) ? date : null,
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feed.TryGetProperty("applicationDue", out var due) && due.TryGetDateTimeOffset(out var deadline) ? deadline : null,
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$"https://arbeidsplassen.nav.no/stillinger/stilling/{jobId}", "nav", "NAV Arbeidsplassen", "searched", retrievedAt, "NO");
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}
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}
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var term = (query ?? "").Trim();
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var place = (location ?? "").Trim();
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return entries.Values.Where(job => Contains(job.Title, term) || Contains(job.Company, term))
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.Where(job => Contains(job.Location, place)).OrderByDescending(job => job.ModifiedAt).Take(100).ToList();
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}
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private async Task<string> GetTokenAsync(CancellationToken cancellationToken)
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{
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var configured = configuration["NavJobs:Token"]?.Trim();
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if (!string.IsNullOrWhiteSpace(configured)) return configured;
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return await cache.GetOrCreateAsync("nav-jobs-public-token", async entry =>
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{
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entry.AbsoluteExpirationRelativeToNow = TimeSpan.FromMinutes(30);
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var text = await clients.CreateClient().GetStringAsync(BaseUrl + "/api/publicToken", cancellationToken);
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var start = text.IndexOf("eyJ", StringComparison.Ordinal);
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if (start < 0) throw new InvalidOperationException("NAV public token was not returned.");
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var token = text[start..].Trim();
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var end = token.IndexOfAny(['\r', '\n', ' ', '\t']);
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return end < 0 ? token : token[..end];
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}) ?? throw new InvalidOperationException("NAV public token was not returned.");
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}
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private static bool Contains(string? value, string filter) =>
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filter.Length == 0 || (value?.Contains(filter, StringComparison.OrdinalIgnoreCase) ?? false);
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}
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