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/utils_sanitise_test.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestStripEmailBasics(t *testing.T) {
+	tests := map[string]string{
+		"test@example.com":              "test@example.com",
+		"test+strip@example.com":        "test@example.com",
+		"test+strip+strip2@example.com": "test@example.com",
+	}
+
+	for in, out := range tests {
+		if stripEmail(in) != out {
+			t.Errorf("for in=%s expected out=%s got out=%s", in, out, stripEmail(in))
+			return
+		}
+	}
+}