util/termcolours.lua
author Matthew Wild <mwild1@gmail.com>
Mon, 31 Oct 2022 14:32:02 +0000
branch0.12
changeset 12794 24b55f0e2db9
parent 10427 317bcc4f25f5
child 12979 d10957394a3c
permissions -rw-r--r--
mod_http: Allow disabling CORS in the http_cors_override option and by default Fixes #1779. Due to an oversight in the logic, if the user set 'enabled' to false in an override, it would disable the item's requested CORS settings, but still apply Prosody's default CORS policy. This change ensures that 'enabled = false' will now disable CORS entirely for the requested item. Due to the new structure of the code, it was necessary to have a flag to say whether CORS is to be applied at all. Rather than hard-coding 'true' here, I chose to add a new option: 'http_default_cors_enabled'. This is a boolean that allows the operator to disable Prosody's default CORS policy entirely (the one that is used when a module or config does not override it). This makes it easier to disable CORS and then selectively enable it only on services you want it on.

-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
--
-- luacheck: ignore 213/i


local t_concat, t_insert = table.concat, table.insert;
local char, format = string.char, string.format;
local tonumber = tonumber;
local ipairs = ipairs;
local io_write = io.write;
local m_floor = math.floor;
local type = type;
local setmetatable = setmetatable;
local pairs = pairs;

local windows;
if os.getenv("WINDIR") then
	windows = require "util.windows";
end
local orig_color = windows and windows.get_consolecolor and windows.get_consolecolor();

local _ENV = nil;
-- luacheck: std none

local stylemap = {
			reset = 0; bright = 1, dim = 2, underscore = 4, blink = 5, reverse = 7, hidden = 8;
			black = 30; red = 31; green = 32; yellow = 33; blue = 34; magenta = 35; cyan = 36; white = 37;
			["black background"] = 40; ["red background"] = 41; ["green background"] = 42; ["yellow background"] = 43;
			["blue background"] = 44; ["magenta background"] = 45; ["cyan background"] = 46; ["white background"] = 47;
			bold = 1, dark = 2, underline = 4, underlined = 4, normal = 0;
		}

local winstylemap = {
	["0"] = orig_color, -- reset
	["1"] = 7+8, -- bold
	["1;33"] = 2+4+8, -- bold yellow
	["1;31"] = 4+8 -- bold red
}

local cssmap = {
	[1] = "font-weight: bold", [2] = "opacity: 0.5", [4] = "text-decoration: underline", [8] = "visibility: hidden",
	[30] = "color:black", [31] = "color:red", [32]="color:green", [33]="color:#FFD700",
	[34] = "color:blue", [35] = "color: magenta", [36] = "color:cyan", [37] = "color: white",
	[40] = "background-color:black", [41] = "background-color:red", [42]="background-color:green",
	[43]="background-color:yellow",	[44] = "background-color:blue", [45] = "background-color: magenta",
	[46] = "background-color:cyan", [47] = "background-color: white";
};

local fmt_string = char(0x1B).."[%sm%s"..char(0x1B).."[0m";
local function getstring(style, text)
	if style then
		return format(fmt_string, style, text);
	else
		return text;
	end
end

local function gray(n)
	return m_floor(n*3/32)+0xe8;
end
local function color(r,g,b)
	if r == g and g == b then
		return gray(r);
	end
	r = m_floor(r*3/128);
	g = m_floor(g*3/128);
	b = m_floor(b*3/128);
	return 0x10 + ( r * 36 ) + ( g * 6 ) + ( b );
end
local function hex2rgb(hex)
	local r = tonumber(hex:sub(1,2),16);
	local g = tonumber(hex:sub(3,4),16);
	local b = tonumber(hex:sub(5,6),16);
	return r,g,b;
end

setmetatable(stylemap, { __index = function(_, style)
	if type(style) == "string" and style:find("%x%x%x%x%x%x") == 1 then
		local g = style:sub(7) == " background" and "48;5;" or "38;5;";
		return format("%s%d", g, color(hex2rgb(style)));
	end
end } );

local csscolors = {
	red = "ff0000"; fuchsia = "ff00ff"; green = "008000"; white = "ffffff";
	lime = "00ff00"; yellow = "ffff00"; purple = "800080"; blue = "0000ff";
	aqua = "00ffff"; olive  = "808000"; black  = "000000"; navy = "000080";
	teal = "008080"; silver = "c0c0c0"; maroon = "800000"; gray = "808080";
}
for colorname, rgb in pairs(csscolors) do
	stylemap[colorname] = stylemap[colorname] or stylemap[rgb];
	colorname, rgb = colorname .. " background", rgb .. " background"
	stylemap[colorname] = stylemap[colorname] or stylemap[rgb];
end

local function getstyle(...)
	local styles, result = { ... }, {};
	for i, style in ipairs(styles) do
		style = stylemap[style];
		if style then
			t_insert(result, style);
		end
	end
	return t_concat(result, ";");
end

local last = "0";
local function setstyle(style)
	style = style or "0";
	if style ~= last then
		io_write("\27["..style.."m");
		last = style;
	end
end

if windows then
	function setstyle(style)
		style = style or "0";
		if style ~= last then
			windows.set_consolecolor(winstylemap[style] or orig_color);
			last = style;
		end
	end
	if not orig_color then
		function setstyle() end
	end
end

local function ansi2css(ansi_codes)
	if ansi_codes == "0" then return "</span>"; end
	local css = {};
	for code in ansi_codes:gmatch("[^;]+") do
		t_insert(css, cssmap[tonumber(code)]);
	end
	return "</span><span style='"..t_concat(css, ";").."'>";
end

local function tohtml(input)
	return input:gsub("\027%[(.-)m", ansi2css);
end

return {
	getstring = getstring;
	getstyle = getstyle;
	setstyle = setstyle;
	tohtml = tohtml;
};