feat(15-03): add Elasticsearch, Kibana, and Splunk ReconSource implementations

- ElasticsearchSource: POST _search API with query_string, parse hits._source
- KibanaSource: GET saved_objects/_find API with kbn-xsrf header
- SplunkSource: GET search/jobs/export API with newline-delimited JSON parsing
- All sources use ciLogKeyPattern for key detection
- Tests use httptest mocks for each API endpoint

pkg/recon/sources/splunk_test.go

@@ -0,0 +1,110 @@
+package sources
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/salvacybersec/keyhunter/pkg/providers"
+	"github.com/salvacybersec/keyhunter/pkg/recon"
+)
+
+func TestSplunk_Name(t *testing.T) {
+	s := &SplunkSource{}
+	if s.Name() != "splunk" {
+		t.Fatalf("expected splunk, got %s", s.Name())
+	}
+}
+
+func TestSplunk_Enabled(t *testing.T) {
+	s := &SplunkSource{}
+	if !s.Enabled(recon.Config{}) {
+		t.Fatal("SplunkSource should always be enabled")
+	}
+}
+
+func TestSplunk_Sweep(t *testing.T) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/services/search/jobs/export", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		// Splunk returns newline-delimited JSON.
+		_, _ = w.Write([]byte(`{"result":{"_raw":"Setting secret_key = sk-proj-ABCDEF1234567890abcdef"},"_raw":"Setting secret_key = sk-proj-ABCDEF1234567890abcdef"}
+{"result":{"_raw":"normal log line no keys here"},"_raw":"normal log line no keys here"}
+`))
+	})
+
+	srv := httptest.NewServer(mux)
+	defer srv.Close()
+
+	reg := providers.NewRegistryFromProviders([]providers.Provider{
+		{Name: "openai", Keywords: []string{"sk-proj-"}},
+	})
+
+	s := &SplunkSource{
+		BaseURL:  srv.URL,
+		Registry: reg,
+		Client:   NewClient(),
+	}
+
+	out := make(chan recon.Finding, 10)
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	err := s.Sweep(ctx, "", 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 Splunk")
+	}
+	if findings[0].SourceType != "recon:splunk" {
+		t.Fatalf("expected recon:splunk, got %s", findings[0].SourceType)
+	}
+}
+
+func TestSplunk_Sweep_NoResults(t *testing.T) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/services/search/jobs/export", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(``))
+	})
+
+	srv := httptest.NewServer(mux)
+	defer srv.Close()
+
+	reg := providers.NewRegistryFromProviders([]providers.Provider{
+		{Name: "openai", Keywords: []string{"sk-proj-"}},
+	})
+
+	s := &SplunkSource{
+		BaseURL:  srv.URL,
+		Registry: reg,
+		Client:   NewClient(),
+	}
+
+	out := make(chan recon.Finding, 10)
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	err := s.Sweep(ctx, "", 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))
+	}
+}