feat: add link creation and lookup

finally has the bare minimum functionality to say that it works!

src/tools/env.ts

@@ -35,3 +35,53 @@ export function getString(
 	return process.env[keyName];
 }
 
+/**
+ * Get the environmental boolean from .env.
+ * Supports rewriting names to UPPER_SNAKE_CASE if isGlobal is set.
+ *
+ * @param      {string}               key              The key
+ * @param      {boolean}              [isGlobal=true]  Indicates if global
+ * @return     {(boolean|undefined)}  The environment boolean.
+ */
+export function getBool(
+	key: string,
+	isGlobal: boolean = true
+): boolean | undefined {
+	
+	const valueRead: string | undefined = getString(key, isGlobal);
+	if (valueRead === undefined) return undefined;
+	if (valueRead.toLowerCase() === 'true')
+		return true;
+
+	return false;
+}
+
+/**
+ * Processes public url, returning protocol, fqdn and path.
+ * proto://fqdn/path/ = fullPublicUrl
+ * @return     {RewriteStrings}  The rewrite strings.
+ */
+export function getRewriteStrings(): RewriteStrings {
+	const fullPublicUrl: string = getString('publicUrl', true)!;
+
+	const url = new URL(fullPublicUrl);
+	const proto = url.protocol.slice(0, -1); // https: -> https
+	const fqdn = url.host;
+	const path = url.pathname.replace(/\/+$/, '') + '/'; // /abc -> /abc/
+
+	const result: RewriteStrings = {
+		fullPublicUrl,
+		proto,
+		fqdn,
+		path
+	};
+
+	return result;
+};
+
+export type RewriteStrings = {
+	fullPublicUrl: string;
+	proto: string;
+	fqdn: string;
+	path: string;
+};