-- Common utility function

-- Author: Jeffry L <[email protected]>

local m = {}

m.__index = m

-- get the filename given full path

-- @param string path

-- @return string filename

function m.get_filename(path)

if type(path) ~= 'string' then error('Invalid filename') end

return string.match(path, '[%w%d%s%-%._]+%.docx')

end

-- get directory name

function m.get_dirname(path)

local filename = m.get_filename(path)

local start_pos = string.find(path, filename, 1, true) - 2

local dirname = string.sub(path, 1, start_pos)

--ngx.log(ngx.ERR, "filename:" .. filename .. " dirname: " .. dirname)

return dirname

end

-- check if file exists

-- @param string full path to filename

-- @return boolean

function m.file_exists(filename)

if type(filename)~="string" then return false end

if not lfs.attributes(filename) then return false end

return true

end

-- make file writeable

function m.file_set_writeable(file)

return os.execute('chmod +w "' .. file .. '"')

end

-- check if directory/file writeable

function m.file_writeable(file)

if not m.file_exists(file) then return false end

local stat = lfs.attributes(file)

if not stat then error(file .. "do not exists") end

local perm = string.sub(stat.permissions, 8, 8)

return perm == 'w'

end

-- escape xml chars

function m.xml_escape_chars(str)

local xml_chars = {

['<'] = "&#60;",

['>'] = "&#62;",

['&'] = "&#38;",

["'"] = "&#39;", -- single quote

['"'] = "&#34;" -- double quote

}

return string.gsub(str, '[<>&\'"]', xml_chars)

end

return m