feat(16-03): add RapidAPI recon source

- RapidAPISource searches public API listings for leaked keys
- Scrapes HTML search pages with ciLogKeyPattern matching
- Credentialless, httptest-based tests

pkg/recon/sources/rapidapi.go

@@ -0,0 +1,95 @@
+package sources
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"time"
+
+	"golang.org/x/time/rate"
+
+	"github.com/salvacybersec/keyhunter/pkg/providers"
+	"github.com/salvacybersec/keyhunter/pkg/recon"
+)
+
+// RapidAPISource searches public RapidAPI listings for exposed API keys.
+// API listings often include code snippets and example requests where
+// developers may accidentally paste real credentials. Credentialless.
+type RapidAPISource struct {
+	BaseURL  string
+	Registry *providers.Registry
+	Limiters *recon.LimiterRegistry
+	Client   *Client
+}
+
+var _ recon.ReconSource = (*RapidAPISource)(nil)
+
+func (s *RapidAPISource) Name() string              { return "rapidapi" }
+func (s *RapidAPISource) RateLimit() rate.Limit      { return rate.Every(3 * time.Second) }
+func (s *RapidAPISource) Burst() int                 { return 3 }
+func (s *RapidAPISource) RespectsRobots() bool       { return false }
+func (s *RapidAPISource) Enabled(_ recon.Config) bool { return true }
+
+func (s *RapidAPISource) Sweep(ctx context.Context, query string, out chan<- recon.Finding) error {
+	base := s.BaseURL
+	if base == "" {
+		base = "https://rapidapi.com"
+	}
+	client := s.Client
+	if client == nil {
+		client = NewClient()
+	}
+
+	queries := BuildQueries(s.Registry, "rapidapi")
+	if len(queries) == 0 {
+		return nil
+	}
+
+	for _, q := range queries {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+
+		if s.Limiters != nil {
+			if err := s.Limiters.Wait(ctx, s.Name(), s.RateLimit(), s.Burst(), false); err != nil {
+				return err
+			}
+		}
+
+		// Search RapidAPI public listings. The search page renders HTML with
+		// code examples and descriptions that may contain leaked keys.
+		searchURL := fmt.Sprintf(
+			"%s/search/%s?sortBy=ByRelevance&page=1",
+			base, url.PathEscape(q),
+		)
+
+		req, err := http.NewRequestWithContext(ctx, http.MethodGet, searchURL, nil)
+		if err != nil {
+			continue
+		}
+
+		resp, err := client.Do(ctx, req)
+		if err != nil {
+			continue
+		}
+
+		data, err := io.ReadAll(io.LimitReader(resp.Body, 512*1024))
+		_ = resp.Body.Close()
+		if err != nil {
+			continue
+		}
+
+		if ciLogKeyPattern.Match(data) {
+			out <- recon.Finding{
+				ProviderName: q,
+				Source:       fmt.Sprintf("https://rapidapi.com/search/%s", url.PathEscape(q)),
+				SourceType:   "recon:rapidapi",
+				Confidence:   "low",
+				DetectedAt:   time.Now(),
+			}
+		}
+	}
+	return nil
+}