feat(12-03): implement AzureBlobScanner, DOSpacesScanner, and all cloud scanner tests

- AzureBlobScanner enumerates public Azure Blob containers with XML listing
- DOSpacesScanner enumerates public DO Spaces across 5 regions (S3-compatible XML)
- httptest-based tests for all four scanners: sweep, empty registry, ctx cancel, metadata
- All sources credentialless, compile-time interface assertions

pkg/recon/sources/dospaces_test.go

@@ -0,0 +1,128 @@
+package sources
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/salvacybersec/keyhunter/pkg/providers"
+	"github.com/salvacybersec/keyhunter/pkg/recon"
+)
+
+func doSpacesTestServer() *httptest.Server {
+	mux := http.NewServeMux()
+
+	// Only testprov-keys bucket in nyc3 region is publicly listable.
+	mux.HandleFunc("/testprov-keys/nyc3/", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method == http.MethodHead {
+			w.WriteHeader(http.StatusOK)
+			return
+		}
+		w.Header().Set("Content-Type", "application/xml")
+		_, _ = w.Write([]byte(`<?xml version="1.0" encoding="UTF-8"?>
+<ListBucketResult>
+  <Contents><Key>.env.production</Key></Contents>
+  <Contents><Key>app.conf</Key></Contents>
+  <Contents><Key>logo.svg</Key></Contents>
+</ListBucketResult>`))
+	})
+
+	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusNotFound)
+	})
+
+	return httptest.NewServer(mux)
+}
+
+func TestDOSpaces_Sweep(t *testing.T) {
+	srv := doSpacesTestServer()
+	defer srv.Close()
+
+	src := &DOSpacesScanner{
+		Registry: cloudTestRegistry(),
+		BaseURL:  srv.URL + "/%s/%s/",
+		client:   NewClient(),
+	}
+
+	out := make(chan recon.Finding, 64)
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	if err := src.Sweep(ctx, "", out); err != nil {
+		t.Fatalf("Sweep error: %v", err)
+	}
+	close(out)
+
+	var findings []recon.Finding
+	for f := range out {
+		findings = append(findings, f)
+	}
+
+	// .env.production and app.conf match; logo.svg does not.
+	if len(findings) != 2 {
+		t.Fatalf("expected 2 findings, got %d: %+v", len(findings), findings)
+	}
+
+	for _, f := range findings {
+		if f.SourceType != "recon:spaces" {
+			t.Errorf("unexpected SourceType: %s", f.SourceType)
+		}
+		if f.Confidence != "medium" {
+			t.Errorf("unexpected Confidence: %s", f.Confidence)
+		}
+	}
+}
+
+func TestDOSpaces_EmptyRegistry(t *testing.T) {
+	src := &DOSpacesScanner{
+		Registry: providers.NewRegistryFromProviders(nil),
+		Limiters: recon.NewLimiterRegistry(),
+		client:   NewClient(),
+	}
+
+	out := make(chan recon.Finding, 4)
+	if err := src.Sweep(context.Background(), "", out); err != nil {
+		t.Fatalf("Sweep error: %v", err)
+	}
+	close(out)
+	if len(out) != 0 {
+		t.Fatal("expected 0 findings")
+	}
+}
+
+func TestDOSpaces_CtxCancelled(t *testing.T) {
+	srv := doSpacesTestServer()
+	defer srv.Close()
+
+	src := &DOSpacesScanner{
+		Registry: cloudTestRegistry(),
+		BaseURL:  srv.URL + "/%s/%s/",
+		client:   NewClient(),
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+
+	out := make(chan recon.Finding, 4)
+	if err := src.Sweep(ctx, "", out); err == nil {
+		t.Fatal("expected ctx error")
+	}
+}
+
+func TestDOSpaces_EnabledAndMeta(t *testing.T) {
+	d := &DOSpacesScanner{}
+	if d.Name() != "spaces" {
+		t.Fatalf("unexpected name: %s", d.Name())
+	}
+	if !d.Enabled(recon.Config{}) {
+		t.Fatal("expected Enabled=true")
+	}
+	if d.RespectsRobots() {
+		t.Fatal("expected RespectsRobots=false")
+	}
+	if d.Burst() != 3 {
+		t.Fatal("expected Burst=3")
+	}
+}