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-- Copyright (C) by Yichun Zhang (agentzh)
-- Copyright (C) by OpenResty Inc.
local ffi = require("ffi")
local base = require("resty.core.base")
local ffi_str = ffi.string
local type = type
local C = ffi.C
local NGX_ERROR = ngx.ERROR
local _M = { version = base.version }
ffi.cdef[[
typedef intptr_t ngx_int_t;
void ngx_encode_base64url(ngx_str_t *dst, ngx_str_t *src);
ngx_int_t ngx_decode_base64url(ngx_str_t *dst, ngx_str_t *src);
]]
local get_string_buf = base.get_string_buf
local dst_str_t = ffi.new("ngx_str_t[1]")
local src_str_t = ffi.new("ngx_str_t[1]")
local function base64_encoded_length(len)
return ((len + 2) / 3) * 4
end
local function base64_decoded_length(len)
return ((len + 3) / 4) * 3
end
function _M.encode_base64url(s)
if type(s) ~= "string" then
return nil, "must provide a string"
end
local len = #s
local trans_len = base64_encoded_length(len)
local src = src_str_t[0]
local dst = dst_str_t[0]
src.data = s
src.len = len
dst.data = get_string_buf(trans_len)
dst.len = trans_len
C.ngx_encode_base64url(dst_str_t, src_str_t)
return ffi_str(dst.data, dst.len)
end
function _M.decode_base64url(s)
if type(s) ~= "string" then
return nil, "must provide a string"
end
local len = #s
local trans_len = base64_decoded_length(len)
local src = src_str_t[0]
local dst = dst_str_t[0]
src.data = s
src.len = len
dst.data = get_string_buf(trans_len)
dst.len = trans_len
local ret = C.ngx_decode_base64url(dst_str_t, src_str_t)
if ret == NGX_ERROR then
return nil, "invalid input"
end
return ffi_str(dst.data, dst.len)
end
return _M
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