File size: 3,067 Bytes
d7c5875 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | local _tl_compat; if (tonumber((_VERSION or ''):match('[%d.]*$')) or 0) < 5.3 then local p, m = pcall(require, 'compat53.module'); if p then _tl_compat = m end end; local io = _tl_compat and _tl_compat.io or io; local ipairs = _tl_compat and _tl_compat.ipairs or ipairs; local math = _tl_compat and _tl_compat.math or math; local pairs = _tl_compat and _tl_compat.pairs or pairs; local pcall = _tl_compat and _tl_compat.pcall or pcall; local string = _tl_compat and _tl_compat.string or string; local table = _tl_compat and _tl_compat.table or table; local _tl_table_unpack = unpack or table.unpack; local type = type
local multipart = { File = {} }
local File = multipart.File
function multipart.url_escape(s)
return (string.gsub(s, "([^A-Za-z0-9_])", function(c)
return string.format("%%%02x", string.byte(c))
end))
end
function multipart.File:mime()
if not self.mimetype then
local mimetypes_ok, mimetypes = pcall(require, "mimetypes")
if mimetypes_ok then
self.mimetype = mimetypes.guess(self.fname)
end
self.mimetype = self.mimetype or "application/octet-stream"
end
return self.mimetype
end
function multipart.File:content()
local fd = io.open(self.fname, "rb")
if not fd then
return nil, "Failed to open file: " .. self.fname
end
local data = fd:read("*a")
fd:close()
return data
end
local function rand_string(len)
local shuffled = {}
for i = 1, len do
local r = math.random(97, 122)
if math.random() >= 0.5 then
r = r - 32
end
shuffled[i] = r
end
return string.char(_tl_table_unpack(shuffled))
end
function multipart.encode(params)
local tuples = {}
for k, v in pairs(params) do
if type(k) == "string" then
table.insert(tuples, { k, v })
end
end
local chunks = {}
for _, tuple in ipairs(tuples) do
local k, v = _tl_table_unpack(tuple)
k = multipart.url_escape(k)
local buffer = { 'Content-Disposition: form-data; name="' .. k .. '"' }
local content
if type(v) == "table" then
buffer[1] = buffer[1] .. ('; filename="' .. v.fname:gsub(".*[/\\]", "") .. '"')
table.insert(buffer, "Content-type: " .. v:mime())
content = v:content()
else
content = v
end
table.insert(buffer, "")
table.insert(buffer, content)
table.insert(chunks, table.concat(buffer, "\r\n"))
end
local boundary
while not boundary do
boundary = "Boundary" .. rand_string(16)
for _, chunk in ipairs(chunks) do
if chunk:find(boundary) then
boundary = nil
break
end
end
end
local inner = "\r\n--" .. boundary .. "\r\n"
return table.concat({ "--", boundary, "\r\n",
table.concat(chunks, inner),
"\r\n", "--", boundary, "--", "\r\n", }), boundary
end
function multipart.new_file(fname, mime)
local self = {}
setmetatable(self, { __index = File })
self.fname = fname
self.mimetype = mime
return self
end
return multipart
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