1 files changed, 77 insertions, 0 deletions
diff --git a/plugins/mod_http_errors.lua b/plugins/mod_http_errors.lua
new file mode 100644
index 00000000..c7bcbbc1
--- /dev/null
+++ b/plugins/mod_http_errors.lua
@@ -0,0 +1,77 @@
+module:set_global();
+module:depends("http");
+
+local server = require "net.http.server";
+local codes = require "net.http.codes";
+local termcolours = require "util.termcolours";
+
+local show_private = module:get_option_boolean("http_errors_detailed", false);
+local always_serve = module:get_option_boolean("http_errors_always_show", true);
+local default_message = { module:get_option_string("http_errors_default_message", "That's all I know.") };
+local default_messages = {
+	[400] = { "What kind of request do you call that??" };
+	[403] = { "You're not allowed to do that." };
+	[404] = { "Whatever you were looking for is not here. %";
+		"Where did you put it?", "It's behind you.", "Keep looking." };
+	[500] = { "% Check your error log for more info.";
+		"Gremlins.", "It broke.", "Don't look at me." };
+};
+
+local messages = setmetatable(module:get_option("http_errors_messages", {}), { __index = default_messages });
+
+local html = [[
+<!DOCTYPE html>
+<html>
+<head>
+	<meta charset="utf-8">
+	<style>
+		body{
+			margin-top:14%;
+			text-align:center;
+			background-color:#F8F8F8;
+			font-family:sans-serif;
+		}
+		h1{
+			font-size:xx-large;
+		}
+		p{
+			font-size:x-large;
+		}
+		p+p { font-size: large; font-family: courier }
+        </style>
+</head>
+<body>
+        <h1>$title</h1>
+        <p>$message</p>
+        <p>$extra</p>
+</body>
+</html>]];
+html = html:gsub("%s%s+", "");
+
+local entities = {
+	["<"] = "&lt;", [">"] = "&gt;", ["&"] = "&amp;",
+	["'"] = "&apos;", ["\""] = "&quot;", ["\n"] = "<br/>",
+};
+
+local function tohtml(plain)
+	return (plain:gsub("[<>&'\"\n]", entities));
+	
+end
+
+local function get_page(code, extra)
+	local message = messages[code];
+	if always_serve or message then
+		message = message or default_message;
+		return (html:gsub("$(%a+)", {
+			title = rawget(codes, code) or ("Code "..tostring(code));
+			message = message[1]:gsub("%%", function ()
+				return message[math.random(2, math.max(#message,2))];
+			end);
+			extra = tohtml(extra or "");
+		}));
+	end
+end
+
+module:hook_object_event(server, "http-error", function (event)
+	return get_page(event.code, (show_private and event.private_message) or event.message);
+end);