File

util/jsonpointer.lua @ 13260:da21185fd026

net.http.server: Support setting Content-Type of uncaught HTTP errors mod_http_errors normally sets the Content-Type header via the response object, which isn't available when handling these uncaught errors. Without a Content-Type header the browser is forced to guess, which may or may not result in something sensible.
author Kim Alvefur <zash@zash.se>
date Fri, 22 Sep 2023 01:47:21 +0200 (15 months ago)
parent 12781:22066b02887f
line wrap: on
line source
local m_type = math.type;

local function unescape_token(escaped_token)
	local unescaped = escaped_token:gsub("~1", "/"):gsub("~0", "~")
	return unescaped
end

local function resolve_json_pointer(ref, path)
	local ptr_len = #path + 1
	for part, pos in path:gmatch("/([^/]*)()") do
		local token = unescape_token(part)
		if not (type(ref) == "table") then
			return nil
		end
		local idx = next(ref)
		local new_ref

		if type(idx) == "string" then
			new_ref = ref[token]
		elseif m_type(idx) == "integer" then
			local i = tonumber(token)
			if token == "-" then
				i = #ref + 1
			end
			new_ref = ref[i + 1]
		else
			return nil, "invalid-table"
		end

		if pos == ptr_len then
			return new_ref
		elseif type(new_ref) == "table" then
			ref = new_ref
		elseif not (type(ref) == "table") then
			return nil, "invalid-path"
		end

	end
	return ref
end

return { resolve = resolve_json_pointer }