| 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 = {} } |
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| local File = multipart.File |
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| function multipart.url_escape(s) |
| return (string.gsub(s, "([^A-Za-z0-9_])", function(c) |
| return string.format("%%%02x", string.byte(c)) |
| end)) |
| end |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| function multipart.new_file(fname, mime) |
| local self = {} |
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| setmetatable(self, { __index = File }) |
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| self.fname = fname |
| self.mimetype = mime |
| return self |
| end |
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| return multipart |
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|
