From de585747f658e0cd261f49eb9971b10847f3aca5 Mon Sep 17 00:00:00 2001
From: Stefan Majewsky <majewsky@gmx.net>
Date: Thu, 14 Aug 2025 23:29:32 +0200
Subject: add package assetembed

---
 assetembed/assetembed_test.go | 101 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 assetembed/assetembed_test.go

(limited to 'assetembed/assetembed_test.go')

diff --git a/assetembed/assetembed_test.go b/assetembed/assetembed_test.go
new file mode 100644
index 0000000..d652ac5
--- /dev/null
+++ b/assetembed/assetembed_test.go
@@ -0,0 +1,101 @@
+// SPDX-FileCopyrightText: 2025 Stefan Majewsky <majewsky@gmx.net>
+// SPDX-License-Identifier: Apache-2.0
+
+package assetembed_test
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"strconv"
+	"strings"
+	"testing"
+	"testing/fstest"
+	"time"
+
+	"github.com/majewsky/gg/assetembed"
+	. "github.com/majewsky/gg/internal/test"
+	. "github.com/majewsky/gg/option"
+)
+
+func TestAssetembed(t *testing.T) {
+	const (
+		fooTxt    = "hello world"
+		fooSHA384 = "/b2OdaZ/KfcBpOBAOF4uI5hjA+oQI5IRr5B/y7g1eLPkF8txzmRu/QgZ3YwIjeG9"
+		barJS     = "alert('hello')"
+		barSHA384 = "nK45OZX/RRKGmhPEj7lSXYQ3NDNNqiBUgbymhjhJ/jpCg0eAyZQ5UuzakE/UFcBd"
+	)
+	h, err := assetembed.NewHandler(fstest.MapFS{
+		"foo.txt": &fstest.MapFile{
+			Data:    []byte(fooTxt),
+			Mode:    0644,
+			ModTime: time.Unix(1, 0),
+		},
+		"res/assets/bar.js": &fstest.MapFile{
+			Data:    []byte(barJS),
+			Mode:    0644,
+			ModTime: time.Unix(2, 0),
+		},
+	})
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	// test Handler.AssetPath()
+	urlSafe := func(base64str string) string {
+		base64str = strings.ReplaceAll(base64str, "+", "-")
+		base64str = strings.ReplaceAll(base64str, "/", "_")
+		return base64str
+	}
+	fooTxtPath := fmt.Sprintf("foo-%s.txt", urlSafe(fooSHA384))
+	AssertEqual(t, h.AssetPath("foo.txt"), Some(fooTxtPath))
+	barJSPath := fmt.Sprintf("res/assets/bar-%s.js", urlSafe(barSHA384))
+	AssertEqual(t, h.AssetPath("res/assets/bar.js"), Some(barJSPath))
+	AssertEqual(t, h.AssetPath("res/assets/unknown.css"), None[string]())
+
+	// test Handler.SubresourceIntegrity()
+	AssertEqual(t, h.SubresourceIntegrity("foo.txt"), Some("sha384-"+fooSHA384))
+	AssertEqual(t, h.SubresourceIntegrity("res/assets/bar.js"), Some("sha384-"+barSHA384))
+	AssertEqual(t, h.SubresourceIntegrity("res/assets/unknown.css"), None[string]())
+
+	// test HTTP handler
+	for _, method := range []string{http.MethodHead, http.MethodGet} {
+		t.Logf("testing with method = %q", method)
+		probe := func(path string) *httptest.ResponseRecorder {
+			req := httptest.NewRequest(method, path, http.NoBody)
+			resp := httptest.NewRecorder()
+			h.ServeHTTP(resp, req)
+			return resp
+		}
+		ifGet := func(payload string) string {
+			if method == http.MethodGet {
+				return payload
+			} else {
+				return ""
+			}
+		}
+
+		resp := probe("/" + fooTxtPath)
+		AssertEqual(t, resp.Code, http.StatusOK)
+		AssertEqual(t, resp.Header().Get("Content-Type"), "text/plain; charset=utf-8")
+		AssertEqual(t, resp.Header().Get("Content-Length"), strconv.Itoa(len(fooTxt)))
+		AssertEqual(t, resp.Body.String(), ifGet(fooTxt))
+
+		resp = probe("/" + barJSPath)
+		AssertEqual(t, resp.Code, http.StatusOK)
+		AssertEqual(t, resp.Header().Get("Content-Type"), "text/javascript; charset=utf-8")
+		AssertEqual(t, resp.Header().Get("Content-Length"), strconv.Itoa(len(barJS)))
+		AssertEqual(t, resp.Body.String(), ifGet(barJS))
+
+		resp = probe("/foo.txt") // without digest!
+		AssertEqual(t, resp.Code, http.StatusNotFound)
+
+		resp = probe("/res/assets/unknown.css") // entirely unknown file
+		AssertEqual(t, resp.Code, http.StatusNotFound)
+	}
+
+	req := httptest.NewRequest(http.MethodPut, "/"+fooTxtPath, http.NoBody)
+	resp := httptest.NewRecorder()
+	h.ServeHTTP(resp, req)
+	AssertEqual(t, resp.Code, http.StatusMethodNotAllowed)
+}
-- 
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