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package mountain_pass
import (
"crypto/md5"
"encoding/hex"
"net/http"
"net/http/httptest"
"os"
"path/filepath"
"strings"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
// osmd5Hex mirrors the production helper in the test so the expected checksum
// served by the fake geofabrik server is derived independently of pbfMD5.
func osmd5Hex(data []byte) string {
sum := md5.Sum(data)
return hex.EncodeToString(sum[:])
}
// fakeGeofabrik serves a PBF payload and an optional .md5 sibling.
func fakeGeofabrik(t *testing.T, pbf []byte, md5Body string) *httptest.Server {
t.Helper()
mux := http.NewServeMux()
mux.HandleFunc("/france-latest.osm.pbf", func(w http.ResponseWriter, r *http.Request) {
w.Write(pbf)
})
mux.HandleFunc("/france-latest.osm.pbf.md5", func(w http.ResponseWriter, r *http.Request) {
if md5Body == "" {
http.Error(w, "not found", http.StatusNotFound)
return
}
w.Write([]byte(md5Body))
})
srv := httptest.NewServer(mux)
t.Cleanup(srv.Close)
return srv
}
func TestFetchFrancePBFDownloadsAndVerifies(t *testing.T) {
pbf := []byte("some-valid-pbf-content-1")
srv := fakeGeofabrik(t, pbf, osmd5Hex(pbf)+" france-latest.osm.pbf\n")
dest := filepath.Join(t.TempDir(), "france-latest.osm.pbf")
err := fetchFrancePBF(srv.Client(), srv.URL+"/france-latest.osm.pbf", dest)
require.NoError(t, err)
got, err := os.ReadFile(dest)
require.NoError(t, err)
assert.Equal(t, pbf, got)
}
func TestFetchFrancePBFMismatchRetainsFile(t *testing.T) {
pbf := []byte("some-valid-pbf-content-2")
srv := fakeGeofabrik(t, pbf, strings.Repeat("0", 32)+" france-latest.osm.pbf\n")
dest := filepath.Join(t.TempDir(), "france-latest.osm.pbf")
err := fetchFrancePBF(srv.Client(), srv.URL+"/france-latest.osm.pbf", dest)
require.Error(t, err)
assert.Contains(t, err.Error(), "checksum mismatch")
// The corrupt file is kept for inspection, not deleted.
got, readErr := os.ReadFile(dest)
require.NoError(t, readErr)
assert.Equal(t, pbf, got)
}
func TestFetchFrancePBFAlreadyCompleteVerified(t *testing.T) {
pbf := []byte("some-valid-pbf-content-3")
srv := fakeGeofabrik(t, pbf, osmd5Hex(pbf)+" france-latest.osm.pbf\n")
dest := filepath.Join(t.TempDir(), "france-latest.osm.pbf")
require.NoError(t, os.WriteFile(dest, pbf, 0o644))
err := fetchFrancePBF(srv.Client(), srv.URL+"/france-latest.osm.pbf", dest)
require.NoError(t, err)
got, _ := os.ReadFile(dest)
assert.Equal(t, pbf, got)
}
func TestFetchFrancePBFAlreadyCompleteCorrupt(t *testing.T) {
pbf := []byte("the-real-content")
corrupt := []byte(strings.Repeat("x", len(pbf)))
require.Equal(t, len(pbf), len(corrupt), "same length to prove size-only check is not enough")
srv := fakeGeofabrik(t, pbf, osmd5Hex(pbf)+" france-latest.osm.pbf\n")
dest := filepath.Join(t.TempDir(), "france-latest.osm.pbf")
require.NoError(t, os.WriteFile(dest, corrupt, 0o644))
err := fetchFrancePBF(srv.Client(), srv.URL+"/france-latest.osm.pbf", dest)
require.Error(t, err)
assert.Contains(t, err.Error(), "checksum mismatch")
got, _ := os.ReadFile(dest)
assert.Equal(t, corrupt, got, "corrupt file retained for inspection")
}
func TestFetchFrancePBFSkipsVerificationWhenChecksumUnreachable(t *testing.T) {
pbf := []byte("some-valid-pbf-content-4")
srv := fakeGeofabrik(t, pbf, "") // md5 endpoint returns 404
dest := filepath.Join(t.TempDir(), "france-latest.osm.pbf")
err := fetchFrancePBF(srv.Client(), srv.URL+"/france-latest.osm.pbf", dest)
require.NoError(t, err)
got, _ := os.ReadFile(dest)
assert.Equal(t, pbf, got)
}
func TestPBFMD5(t *testing.T) {
data := []byte("known-content-for-md5-test")
expected := osmd5Hex(data)
path := filepath.Join(t.TempDir(), "sample.bin")
require.NoError(t, os.WriteFile(path, data, 0o644))
got, err := pbfMD5(path)
require.NoError(t, err)
assert.Equal(t, expected, got)
}
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