proxy: add JWT request signing support (#19)

- Refactored middleware and request hander logging.
- Request refactored to use context.Context.
- Add helper (based on Alice) to allow middleware chaining.
- Add helper scripts to generate elliptic curve self-signed certificate that can be used to sign JWT.
- Changed LetsEncrypt scripts to use acme instead of certbot.
- Add script to have LetsEncrypt sign an RSA based certificate.
- Add documentation to explain how to verify headers.
- Refactored internal/cryptutil signer's code to expect a valid EC priv key.
- Changed JWT expiries to use default leeway period.
- Update docs and add screenshots.
- Replaced logging handler logic to use context.Context.
- Removed specific XML error handling.
- Refactored handler function signatures to prefer standard go idioms.

docs/.vuepress/config.js

@@ -9,7 +9,7 @@ module.exports = {
 		docsDir: "docs",
 		editLinkText: "Edit this page on GitHub",
 		lastUpdated: "Last Updated",
-		nav: [{text: "Guide", link: "/guide/"}],
+		nav: [{ text: "Guide", link: "/guide/" }],
 		sidebar: {
 			"/guide/": genSidebarConfig("Guide")
 		}
@@ -21,7 +21,7 @@ function genSidebarConfig(title) {
 		{
 			title,
 			collapsable: false,
-			children: ["", "identity-providers"]
+			children: ["", "identity-providers", "signed-headers"]
 		}
 	];
 }