To use it paste the following code into any page. I’ve put mine under Library/Me/Script/sitemap. You can change the defaults if you want, but it’s not required.
Question for anyone viewing this, is there any better way to access JS-land from Space Lua? I’m doing an export default foobar encoded into a data URI, and then using js.import but that feels very hacky.
---
tags: meta
---
```space-lua
do
local defaults = {
domain = "o.stag.lol"; -- base absolute domain (fallback if not in http header)
cf = "weekly"; -- default for <changefreq>
cfname = "changefreq"; -- frontmatter attribute to be used
}
-- js: export default encodeURIComponent
local encodeURI = js.import("data:text/javascript,export%20default%20encodeURIComponent")
local function gensitemap(host)
local sitemap = ""
for page in each(space.listPages()) do
if not (
page.name:startsWith("Library/") or
page.name == page.name:upper()
) then
sitemap = sitemap + spacelua.interpolate([[
<url>
<loc>https://${host}/${encodeURI(page.name)}</loc>
<lastmod>${page.lastModified}</lastmod>
<changefreq>${page[defaults.cfname] or defaults.cf}</changefreq>
</url>
]], {host=host;encodeURI=encodeURI;page=page;defaults=defaults})
end
end
return spacelua.interpolate([[
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
${sitemap}
</urlset>
]], {sitemap=sitemap})
end
event.listen {
name = "http:request:/sitemap.xml";
run = function(event)
local stat, res = pcall(function()
return gensitemap(event.data.headers.host or defaults.domain)
end)
return {
status = 200;
headers = {
["Content-Type"] = stat and "application/xml" or "text/plain";
};
body = stat and res or "Error: " .. res;
}
end;
}
end
```
No wonder it feels hacky, I’m impressed you made it work! If I understand correctly, a big reason of introducing Lua was to prevent access to arbitrary JavaScript from Space Scripts, and instead only allow Plugs to do it. Since working with URLs seems a reasonably popular thing to do in a web app, maybe we’ll get the function as built-in one day?
I raise you an even hackier (or not?) solution: the algorithms for UTF-8 or URI encoding aren’t terribly complicated and they have good documentation…
encodeURIComponent reimplemented in Space Lua
function encodeURIComponent(uriComponent)
-- this works better on v2
local text, count = string.gsub(uriComponent, "([^A-Za-z0-9\\\\\\-_.!~*'()])", function(character)
local c = string.byte(character)
local bytes = {}
if c <= 127 then -- c <= 0x7F, regular ASCII
bytes[1] = c
elseif c <= 2047 then -- c <= 0x7FF
bytes[2] = 128 + (c % 64) -- 0x80 + c & 0x3F
c = c // 64 -- c = c >> 6
bytes[1] = 192 + c -- 0xC0 + c
elseif c <= 65535 then -- c <= 0xFFFF
bytes[3] = 128 + (c % 64)
c = c // 64
bytes[2] = 128 + (c % 64)
c = c // 64
bytes[1] = 224 + c -- 0xE0 + c
elseif c <= 1114111 then -- c <= 0x10FFFF
bytes[4] = 128 + (c % 64)
c = c // 64
bytes[3] = 128 + (c % 64)
c = c // 64
bytes[2] = 128 + (c % 64)
c = c // 64
bytes[1] = 240 + c -- 0xF0 + c
end
local out = ""
for _, b in ipairs(bytes) do
out = out .. string.format("%%%02X", b)
end
return out
end)
return text
end
That’s weird. Try double checking these lines are correct:
event.listen {
name = "http:request:/sitemap.xml";
and that you’re accessing it at silverbullet/_/sitemap.xml.
Maybe the event listener isn’t being registered for some reason, check that it’s in a space-lua block. Also, logs from DevTools (ctrl+shift+i) will be helpful.
