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117 lines
3.3 KiB
117 lines
3.3 KiB
local M = { _NAME = "uri.data" }
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local Util = require "uri._util"
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local URI = require "uri"
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Util.subclass_of(M, URI)
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-- This implements the 'data' scheme defined in RFC 2397.
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local Filter = Util.attempt_require("datafilter")
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local function _valid_base64 (data) return data:find("^[0-9a-zA-Z/+]*$") end
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local function _split_path (path)
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local _, _, mediatype, data = path:find("^([^,]*),(.*)")
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if not mediatype then return "must have comma in path" end
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local base64 = false
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if mediatype:find(";base64$") then
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base64 = true
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mediatype = mediatype:sub(1, -8)
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end
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if base64 and not _valid_base64(data) then
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return "illegal character in base64 encoding"
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end
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return nil, mediatype, base64, data
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end
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function M.init (self)
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if M._SUPER.host(self) then
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return nil, "data URIs may not have authority parts"
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end
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local err, mediatype, base64, data = _split_path(M._SUPER.path(self))
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if err then return nil, "invalid data URI (" .. err .. ")" end
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return self
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end
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function M.data_media_type (self, ...)
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local _, old, base64, data = _split_path(M._SUPER.path(self))
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if select('#', ...) > 0 then
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local new = ... or ""
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new = Util.uri_encode(new, "^A-Za-z0-9%-._~!$&'()*+;=:@/")
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if base64 then new = new .. ";base64" end
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M._SUPER.path(self, new .. "," .. data)
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end
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if old ~= "" then
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if old:find("^;") then old = "text/plain" .. old end
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return Util.uri_decode(old)
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else
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return "text/plain;charset=US-ASCII" -- default type
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end
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end
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local function _urienc_len (s)
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local num_unsafe_chars = s:gsub("[A-Za-z0-9%-._~!$&'()*+,;=:@/]", ""):len()
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local num_safe_chars = s:len() - num_unsafe_chars
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return num_safe_chars + num_unsafe_chars * 3
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end
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local function _base64_len (s)
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local num_blocks = (s:len() + 2) / 3
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num_blocks = num_blocks - num_blocks % 1
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return num_blocks * 4
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+ 7 -- because of ";base64" marker
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end
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local function _do_filter (algorithm, input)
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return Filter[algorithm](input)
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end
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function M.data_bytes (self, ...)
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local _, mediatype, base64, old = _split_path(M._SUPER.path(self))
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if base64 then
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if not Filter then
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error("'datafilter' Lua module required to decode base64 data", 2)
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end
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old = _do_filter("base64_decode", old)
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else
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old = Util.uri_decode(old)
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end
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if select('#', ...) > 0 then
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local new = ... or ""
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local urienc_len = _urienc_len(new)
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local base64_len = _base64_len(new)
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if base64_len < urienc_len and Filter then
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mediatype = mediatype .. ";base64"
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new = _do_filter("base64_encode", new)
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else
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new = new:gsub("%%", "%%25")
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end
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M._SUPER.path(self, mediatype .. "," .. new)
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end
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return old
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end
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function M.path (self, ...)
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local old = M._SUPER.path(self)
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if select('#', ...) > 0 then
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local new = ...
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if not new then error("there must be a path in a data URI") end
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local err = _split_path(new)
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if err then error("invalid data URI (" .. err .. ")") end
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M._SUPER.path(self, new)
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end
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return old
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end
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Util.uri_part_not_allowed(M, "userinfo")
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Util.uri_part_not_allowed(M, "host")
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Util.uri_part_not_allowed(M, "port")
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return M
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-- vi:ts=4 sw=4 expandtab
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