1 files changed, 41 insertions, 0 deletions
diff --git a/internal/render/readme.go b/internal/render/readme.go
new file mode 100644
index 0000000..aecd2f7
--- /dev/null
+++ b/internal/render/readme.go
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+// SPDX-FileCopyrightText: Copyright (c) 2025 Runxi Yu <https://runxiyu.org>
+
+package render
+
+import (
+	"bytes"
+	"html"
+	"html/template"
+	"strings"
+
+	"github.com/microcosm-cc/bluemonday"
+	"github.com/niklasfasching/go-org/org"
+	"github.com/yuin/goldmark"
+	"github.com/yuin/goldmark/extension"
+	"go.lindenii.runxiyu.org/forge/internal/misc"
+)
+
+var markdownConverter = goldmark.New(goldmark.WithExtensions(extension.GFM))
+
+// renderReadme renders and sanitizes README content from a byte slice and filename.
+func Readme(data []byte, filename string) (string, template.HTML) {
+	switch strings.ToLower(filename) {
+	case "readme":
+		return "README", template.HTML("<pre>" + html.EscapeString(misc.BytesToString(data)) + "</pre>") //#nosec G203
+	case "readme.md":
+		var buf bytes.Buffer
+		if err := markdownConverter.Convert(data, &buf); err != nil {
+			return "Error fetching README", EscapeHTML("Unable to render README: " + err.Error())
+		}
+		return "README.md", template.HTML(bluemonday.UGCPolicy().SanitizeBytes(buf.Bytes())) //#nosec G203
+	case "readme.org":
+		htmlStr, err := org.New().Parse(strings.NewReader(misc.BytesToString(data)), filename).Write(org.NewHTMLWriter())
+		if err != nil {
+			return "Error fetching README", EscapeHTML("Unable to render README: " + err.Error())
+		}
+		return "README.org", template.HTML(bluemonday.UGCPolicy().Sanitize(htmlStr)) //#nosec G203
+	default:
+		return filename, template.HTML("<pre>" + html.EscapeString(misc.BytesToString(data)) + "</pre>") //#nosec G203
+	}
+}