api: Add go files

I know this is a huge commit, but I can't be bothered to check
this in part by part.

api/markdown_html_test.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestMarkdownToHtmlBasics(t *testing.T) {
+	failTestOnError(t, setupTestEnv())
+
+	// basic markdown and expected html tests
+	tests := map[string]string{
+		"Foo": "<p>Foo</p>",
+
+		"Foo\n\nBar": "<p>Foo</p>\n\n<p>Bar</p>",
+
+		"XSS: <script src='http://example.com/script.js'></script> Foo": "<p>XSS:  Foo</p>",
+
+		"Regular [Link](http://example.com)": "<p>Regular <a href=\"http://example.com\" rel=\"nofollow\">Link</a></p>",
+
+		"XSS [Link](data:text/html;base64,PHNjcmlwdD5hbGVydCgxKTwvc2NyaXB0Pgo=)": "<p>XSS <tt>Link</tt></p>",
+
+		"![Images disallowed](http://example.com/image.jpg)": "<p></p>",
+
+		"**bold** *italics*": "<p><strong>bold</strong> <em>italics</em></p>",
+
+		"http://example.com/autolink": "<p><a href=\"http://example.com/autolink\" rel=\"nofollow\">http://example.com/autolink</a></p>",
+
+		"<b>not bold</b>": "<p>not bold</p>",
+	}
+
+	for in, out := range tests {
+		html := strings.TrimSpace(markdownToHtml(in))
+		if html != out {
+			t.Errorf("for in=[%s] expected out=[%s] got out=[%s]", in, out, html)
+			return
+		}
+	}
+}