Replace go-bindata with Go embed

Co-authored-by: nrwiersma <nick@wiersma.co.za>

pkg/api/dashboard/dashboard_test.go

@@ -0,0 +1,114 @@
+package dashboard
+
+import (
+	"errors"
+	"io/fs"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"testing/fstest"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_safePrefix(t *testing.T) {
+	testCases := []struct {
+		desc     string
+		value    string
+		expected string
+	}{
+		{
+			desc:     "host",
+			value:    "https://example.com",
+			expected: "",
+		},
+		{
+			desc:     "host with path",
+			value:    "https://example.com/foo/bar?test",
+			expected: "",
+		},
+		{
+			desc:     "path",
+			value:    "/foo/bar",
+			expected: "/foo/bar",
+		},
+		{
+			desc:     "path without leading slash",
+			value:    "foo/bar",
+			expected: "foo/bar",
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			req, err := http.NewRequest(http.MethodGet, "http://localhost", nil)
+			require.NoError(t, err)
+
+			req.Header.Set("X-Forwarded-Prefix", test.value)
+
+			prefix := safePrefix(req)
+
+			assert.Equal(t, test.expected, prefix)
+		})
+	}
+}
+
+func Test_ContentSecurityPolicy(t *testing.T) {
+	testCases := []struct {
+		desc     string
+		handler  Handler
+		expected int
+	}{
+		{
+			desc: "OK",
+			handler: Handler{
+				assets: fstest.MapFS{"foobar.html": &fstest.MapFile{
+					Mode:    0755,
+					ModTime: time.Now(),
+				}},
+			},
+			expected: http.StatusOK,
+		},
+		{
+			desc: "Not found",
+			handler: Handler{
+				assets: fstest.MapFS{},
+			},
+			expected: http.StatusNotFound,
+		},
+		{
+			desc: "Internal server error",
+			handler: Handler{
+				assets: errorFS{},
+			},
+			expected: http.StatusInternalServerError,
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			req := httptest.NewRequest(http.MethodGet, "/foobar.html", nil)
+
+			rw := httptest.NewRecorder()
+
+			test.handler.ServeHTTP(rw, req)
+
+			assert.Equal(t, test.expected, rw.Code)
+			assert.Equal(t, "frame-src 'self' https://traefik.io https://*.traefik.io;", rw.Result().Header.Get("Content-Security-Policy"))
+		})
+	}
+}
+
+type errorFS struct{}
+
+func (e errorFS) Open(name string) (fs.File, error) {
+	return nil, errors.New("oops")
+}