feat(16-02): add APKMirror and crt.sh ReconSource modules

- APKMirrorSource searches APK metadata pages for key patterns
- CrtShSource discovers subdomains via CT logs and probes config endpoints
- Both credentialless, emit findings on ciLogKeyPattern match

pkg/recon/sources/crtsh_test.go

@@ -0,0 +1,139 @@
+package sources
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/salvacybersec/keyhunter/pkg/recon"
+)
+
+func TestCrtSh_Name(t *testing.T) {
+	s := &CrtShSource{}
+	if s.Name() != "crtsh" {
+		t.Fatalf("expected crtsh, got %s", s.Name())
+	}
+}
+
+func TestCrtSh_Enabled(t *testing.T) {
+	s := &CrtShSource{}
+	if !s.Enabled(recon.Config{}) {
+		t.Fatal("CrtShSource should always be enabled")
+	}
+}
+
+func TestCrtSh_Sweep_SkipsKeywords(t *testing.T) {
+	s := &CrtShSource{Client: NewClient()}
+
+	out := make(chan recon.Finding, 10)
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	// "sk-proj-" has no dot -- should be skipped as a keyword.
+	err := s.Sweep(ctx, "sk-proj-", out)
+	close(out)
+	if err != nil {
+		t.Fatalf("Sweep error: %v", err)
+	}
+	var findings []recon.Finding
+	for f := range out {
+		findings = append(findings, f)
+	}
+	if len(findings) != 0 {
+		t.Fatalf("expected no findings for keyword query, got %d", len(findings))
+	}
+}
+
+func TestCrtSh_Sweep(t *testing.T) {
+	// Mux handles both crt.sh API and probe endpoints.
+	mux := http.NewServeMux()
+
+	// crt.sh subdomain lookup.
+	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Query().Get("output") == "json" {
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = w.Write([]byte(`[
+				{"name_value":"api.example.com","common_name":"api.example.com"},
+				{"name_value":"staging.example.com","common_name":"staging.example.com"}
+			]`))
+			return
+		}
+		http.NotFound(w, r)
+	})
+
+	crtSrv := httptest.NewServer(mux)
+	defer crtSrv.Close()
+
+	// Probe server: serves /.env with key-like content.
+	probeMux := http.NewServeMux()
+	probeMux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		if strings.HasSuffix(r.URL.Path, "/.env") {
+			_, _ = w.Write([]byte(`API_KEY = "sk-proj-ABCDEF1234567890abcdef"`))
+			return
+		}
+		http.NotFound(w, r)
+	})
+	probeSrv := httptest.NewServer(probeMux)
+	defer probeSrv.Close()
+
+	s := &CrtShSource{
+		BaseURL:      crtSrv.URL,
+		Client:       NewClient(),
+		ProbeBaseURL: probeSrv.URL,
+	}
+
+	out := make(chan recon.Finding, 20)
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	err := s.Sweep(ctx, "example.com", out)
+	close(out)
+	if err != nil {
+		t.Fatalf("Sweep error: %v", err)
+	}
+
+	var findings []recon.Finding
+	for f := range out {
+		findings = append(findings, f)
+	}
+	if len(findings) == 0 {
+		t.Fatal("expected at least one finding from crt.sh probe")
+	}
+	if findings[0].SourceType != "recon:crtsh" {
+		t.Fatalf("expected recon:crtsh, got %s", findings[0].SourceType)
+	}
+}
+
+func TestCrtSh_Sweep_NoSubdomains(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`[]`))
+	}))
+	defer srv.Close()
+
+	s := &CrtShSource{
+		BaseURL: srv.URL,
+		Client:  NewClient(),
+	}
+
+	out := make(chan recon.Finding, 10)
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	err := s.Sweep(ctx, "empty.example.com", out)
+	close(out)
+	if err != nil {
+		t.Fatalf("Sweep error: %v", err)
+	}
+
+	var findings []recon.Finding
+	for f := range out {
+		findings = append(findings, f)
+	}
+	if len(findings) != 0 {
+		t.Fatalf("expected no findings, got %d", len(findings))
+	}
+}