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-- Copyright (C) Yichun Zhang (agentzh)


local ffi = require "ffi"
local base = require "resty.core.base"


local C = ffi.C
local ffi_new = ffi.new
local ffi_str = ffi.string
local type = type
local error = error
local tostring = tostring
local setmetatable = setmetatable
local get_request = base.get_request
local get_string_buf = base.get_string_buf
local get_size_ptr = base.get_size_ptr
local new_tab = base.new_tab
local subsystem = ngx.config.subsystem


local ngx_lua_ffi_var_get
local ngx_lua_ffi_var_set


local ERR_BUF_SIZE = 256


ngx.var = new_tab(0, 0)


if subsystem == "http" then
    ffi.cdef[[
    int ngx_http_lua_ffi_var_get(ngx_http_request_t *r,
        const char *name_data, size_t name_len, char *lowcase_buf,
        int capture_id, char **value, size_t *value_len, char **err);

    int ngx_http_lua_ffi_var_set(ngx_http_request_t *r,
        const unsigned char *name_data, size_t name_len,
        unsigned char *lowcase_buf, const unsigned char *value,
        size_t value_len, unsigned char *errbuf, size_t *errlen);
    ]]

    ngx_lua_ffi_var_get = C.ngx_http_lua_ffi_var_get
    ngx_lua_ffi_var_set = C.ngx_http_lua_ffi_var_set

elseif subsystem == "stream" then
    ffi.cdef[[
    int ngx_stream_lua_ffi_var_get(ngx_stream_lua_request_t *r,
        const char *name_data, size_t name_len, char *lowcase_buf,
        int capture_id, char **value, size_t *value_len, char **err);

    int ngx_stream_lua_ffi_var_set(ngx_stream_lua_request_t *r,
        const unsigned char *name_data, size_t name_len,
        unsigned char *lowcase_buf, const unsigned char *value,
        size_t value_len, unsigned char *errbuf, size_t *errlen);
    ]]

    ngx_lua_ffi_var_get = C.ngx_stream_lua_ffi_var_get
    ngx_lua_ffi_var_set = C.ngx_stream_lua_ffi_var_set
end


local value_ptr = ffi_new("unsigned char *[1]")
local errmsg = base.get_errmsg_ptr()


local function var_get(self, name)
    local r = get_request()
    if not r then
        error("no request found")
    end

    local value_len = get_size_ptr()
    local rc
    if type(name) == "number" then
        rc = ngx_lua_ffi_var_get(r, nil, 0, nil, name, value_ptr, value_len,
                                 errmsg)

    else
        if type(name) ~= "string" then
            error("bad variable name", 2)
        end

        local name_len = #name
        local lowcase_buf = get_string_buf(name_len)

        rc = ngx_lua_ffi_var_get(r, name, name_len, lowcase_buf, 0, value_ptr,
                                 value_len, errmsg)
    end

    -- ngx.log(ngx.WARN, "rc = ", rc)

    if rc == 0 then -- NGX_OK
        return ffi_str(value_ptr[0], value_len[0])
    end

    if rc == -5 then  -- NGX_DECLINED
        return nil
    end

    if rc == -1 then  -- NGX_ERROR
        error(ffi_str(errmsg[0]), 2)
    end
end


local function var_set(self, name, value)
    local r = get_request()
    if not r then
        error("no request found")
    end

    if type(name) ~= "string" then
        error("bad variable name", 2)
    end
    local name_len = #name

    local errlen = get_size_ptr()
    errlen[0] = ERR_BUF_SIZE
    local lowcase_buf = get_string_buf(name_len + ERR_BUF_SIZE)

    local value_len
    if value == nil then
        value_len = 0
    else
        if type(value) ~= 'string' then
            value = tostring(value)
        end
        value_len = #value
    end

    local errbuf = lowcase_buf + name_len
    local rc = ngx_lua_ffi_var_set(r, name, name_len, lowcase_buf, value,
                                   value_len, errbuf, errlen)

    -- ngx.log(ngx.WARN, "rc = ", rc)

    if rc == 0 then -- NGX_OK
        return
    end

    if rc == -1 then  -- NGX_ERROR
        error(ffi_str(errbuf, errlen[0]), 2)
    end
end


do
    local mt = new_tab(0, 2)
    mt.__index = var_get
    mt.__newindex = var_set

    setmetatable(ngx.var, mt)
end


return {
    version = base.version
}

Filemanager

DIR : / opt/ imunify360-webshield/ lualib/ resty/ core/
Name Type Size Permission Actions
base.lua File 5.96 KB 0644
base64.lua File 3.66 KB 0644
coroutine.lua File 720 B 0644
ctx.lua File 3.89 KB 0644
exit.lua File 1.41 KB 0644
hash.lua File 3.92 KB 0644
misc.lua File 5.7 KB 0644
ndk.lua File 2.13 KB 0644
param.lua File 2.35 KB 0644
phase.lua File 1.65 KB 0644
regex.lua File 34.61 KB 0644
request.lua File 11.84 KB 0644
response.lua File 6.48 KB 0644
shdict.lua File 26.56 KB 0644
socket.lua File 15.11 KB 0644
time.lua File 4.64 KB 0644
uri.lua File 3.03 KB 0644
utils.lua File 972 B 0644
var.lua File 3.82 KB 0644
worker.lua File 3.41 KB 0644