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-- Copyright (C) Yichun Zhang (agentzh)
local ffi = require 'ffi'
local base = require "resty.core.base"
require "resty.core.phase" -- for ngx.get_phase
local C = ffi.C
local ffi_str = ffi.string
local FFI_AGAIN = base.FFI_AGAIN
local FFI_OK = base.FFI_OK
local get_request = base.get_request
local get_string_buf = base.get_string_buf
local getmetatable = getmetatable
local ngx = ngx
local ngx_phase = ngx.get_phase
local _M = {
version = base.version
}
ffi.cdef[[
typedef unsigned char u_char;
void ngx_http_lua_ffi_get_setby_param(ngx_http_request_t *r, int idx,
u_char **data, size_t *len);
int ngx_http_lua_ffi_get_body_filter_param_eof(ngx_http_request_t *r);
int ngx_http_lua_ffi_get_body_filter_param_body(ngx_http_request_t *r,
u_char **data_p, size_t *len_p);
int ngx_http_lua_ffi_copy_body_filter_param_body(ngx_http_request_t *r,
u_char *data);
]]
local data_p = ffi.new("unsigned char*[1]")
local len_p = ffi.new("size_t[1]")
local function get_setby_param(r, idx)
C.ngx_http_lua_ffi_get_setby_param(r, idx, data_p, len_p)
if len_p[0] == 0 then
return nil
end
return ffi_str(data_p[0], len_p[0])
end
local function get_body_filter_param(r, idx)
if idx == 1 then
data_p[0] = nil
local rc = C.ngx_http_lua_ffi_get_body_filter_param_body(r, data_p,
len_p)
if rc == FFI_AGAIN then
local buf = get_string_buf(len_p[0])
assert(C.ngx_http_lua_ffi_copy_body_filter_param_body(r, buf)
== FFI_OK)
return ffi_str(buf, len_p[0])
end
if len_p[0] == 0 then
return ""
end
return ffi_str(data_p[0], len_p[0])
elseif idx == 2 then
local rc = C.ngx_http_lua_ffi_get_body_filter_param_eof(r)
return rc == 1
else
return nil
end
end
local function get_param(tb, idx)
local r = get_request()
if not r then
error("no request found")
end
local phase = ngx_phase()
if phase == "set" then
return get_setby_param(r, idx)
end
if phase == "body_filter" then
return get_body_filter_param(r, idx)
end
error("API disabled in the current context")
end
do
local mt = getmetatable(ngx.arg)
mt.__index = get_param
end
return _M
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