Medjobs: reveal hidden contact number via admin-ajax during crawl

The contact phone on medjobs.ir is loaded by JS only after clicking
«تماس با این آگهی» — it isn't in the page HTML, so scanning the markup
found nothing. We now replay that exact reveal request server-side:

- POST https://medjobs.ir/wp-admin/admin-ajax.php with
  action=isatis_protect_contact & id=<listingId> (no nonce needed),
  then harvest the tel: numbers from the returned HTML table.
- Listing id is pulled from the page via the WP shortlink (?p=ID),
  postid-/data-id, or the visible «کد آگهی» as a fallback.
- Numbers are appended to the ad text so the parser/AI capture them and
  they reach the published listing. Wrapped in try/catch so a failed
  reveal never breaks ingestion; uses the same (proxy-aware, brotli-
  decompressing) client as the page fetch.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/JobsMedical.Web/Services/Scraping/MedjobsListingSource.cs

@@ -60,6 +60,10 @@ public class MedjobsListingSource : IListingSource
                 {
                     var html = await client.GetStringAsync(url, ct);
                     var text = ExtractAd(html);
+                    // The contact number is hidden until clicked; replay the site's reveal call.
+                    var phones = await RevealPhonesAsync(client, html, url, ct);
+                    if (phones.Count > 0 && !phones.Any(text.Contains))
+                        text += "\nشماره تماس: " + string.Join("، ", phones);
                     if (text.Length >= 25) items.Add(new ScrapedItem("مدجابز", text, url));
                 }
                 catch (Exception ex) { _log.LogWarning(ex, "medjobs: ad {Url} failed", url); }
@@ -74,6 +78,58 @@ public class MedjobsListingSource : IListingSource
         }
     }
 
+    private const string AjaxUrl = "https://medjobs.ir/wp-admin/admin-ajax.php";
+
+    /// <summary>
+    /// medjobs hides the contact number behind a click that POSTs to admin-ajax
+    /// (action=isatis_protect_contact, id=&lt;listingId&gt;) and returns an HTML table of tel: links.
+    /// We replay that request server-side and harvest the numbers. No nonce required.
+    /// </summary>
+    private async Task<List<string>> RevealPhonesAsync(HttpClient client, string pageHtml, string adUrl, CancellationToken ct)
+    {
+        var id = ExtractListingId(pageHtml);
+        if (id is null) return new();
+        try
+        {
+            using var req = new HttpRequestMessage(HttpMethod.Post, AjaxUrl)
+            {
+                Content = new FormUrlEncodedContent(new Dictionary<string, string>
+                {
+                    ["action"] = "isatis_protect_contact",
+                    ["id"] = id,
+                }),
+            };
+            req.Headers.TryAddWithoutValidation("X-Requested-With", "XMLHttpRequest");
+            req.Headers.TryAddWithoutValidation("Referer", adUrl);
+            req.Headers.TryAddWithoutValidation("Accept", "text/html, */*; q=0.01");
+
+            using var resp = await client.SendAsync(req, ct);
+            if (!resp.IsSuccessStatusCode) return new();
+            var body = await resp.Content.ReadAsStringAsync(ct);
+            return HtmlUtil.HarvestPhones(body);
+        }
+        catch (Exception ex)
+        {
+            _log.LogWarning(ex, "medjobs: phone reveal failed for {Url}", adUrl);
+            return new();
+        }
+    }
+
+    /// <summary>The numeric listing id used by the reveal call (= «کد آگهی»).</summary>
+    private static string? ExtractListingId(string html)
+    {
+        // Most reliable: the WP shortlink (?p=ID) and the body's postid-ID class.
+        var m = Regex.Match(html, @"[?&]p=(\d{2,})");
+        if (m.Success) return m.Groups[1].Value;
+        m = Regex.Match(html, @"postid-(\d{2,})");
+        if (m.Success) return m.Groups[1].Value;
+        m = Regex.Match(html, @"data-(?:id|listing[-_]?id)=[""'](\d{2,})[""']", RegexOptions.IgnoreCase);
+        if (m.Success) return m.Groups[1].Value;
+        // Fallback: the visible «کد آگهی : ۳۹۲۳۰۵».
+        m = Regex.Match(HtmlUtil.ToLatinDigits(html), @"کد[\s\S]{0,8}?آگهی[\s\S]{0,12}?(\d{3,})");
+        return m.Success ? m.Groups[1].Value : null;
+    }
+
     private static IEnumerable<string> Locs(string xml)
         => Regex.Matches(xml, "<loc>([^<]+)</loc>").Select(m => m.Groups[1].Value.Trim());