modlib/web/uri.lua

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2022-01-19 17:24:29 +01:00
-- URI escaping utilities
-- See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURI
local uri_unescaped_chars = {}
for char in ("-_.!~*'()"):gmatch(".") do
uri_unescaped_chars[char] = true
end
local function add_unescaped_range(from, to)
for byte = from:byte(), to:byte() do
uri_unescaped_chars[string.char(byte)] = true
end
end
add_unescaped_range("0", "9")
add_unescaped_range("a", "z")
add_unescaped_range("A", "Z")
local uri_allowed_chars = table.copy(uri_unescaped_chars)
for char in (";,/?:@&=+$#"):gmatch(".") do
-- Reserved characters are allowed
uri_allowed_chars[char] = true
end
local function encode(text, allowed_chars)
return text:gsub(".", function(char)
if allowed_chars[char] then
return char
end
return ("%%%02X"):format(char:byte())
end)
end
local uri = {}
function uri.encode_component(text)
return encode(text, uri_unescaped_chars)
end
function uri.encode(text)
return encode(text, uri_allowed_chars)
end
return uri