add csv reading, routing

internal/redirect.go

@@ -0,0 +1,24 @@
+package internal
+
+type Redirect struct {
+	From       string
+	To         string
+	StatusCode int
+}
+
+func (r *Redirect) Match(from string) bool {
+	return from == r.From
+}
+
+type Redirects []*Redirect
+
+func (rs Redirects) Find(from string) *Redirect {
+	for i := 0; i < len(rs); i++ {
+		redirect := rs[i]
+		if redirect.Match(from) {
+			return redirect
+		}
+	}
+
+	return nil
+}