mirror of
https://github.com/lunarmodules/luasocket.git
synced 2024-07-02 03:09:48 +02:00
235 lines
8.1 KiB
Lua
235 lines
8.1 KiB
Lua
-----------------------------------------------------------------------------
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-- URI parsing, composition and relative URL resolution
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-- LuaSocket 1.5 toolkit.
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-- Author: Diego Nehab
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-- Conforming to: RFC 2396, LTN7
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-- RCS ID: $Id$
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----------------------------------------------------------------------------
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local Public, Private = {}, {}
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socket.url = Public
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-----------------------------------------------------------------------------
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-- Parses a url and returns a table with all its parts according to RFC 2396
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-- The following grammar describes the names given to the URL parts
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-- <url> ::= <scheme>://<authority>/<path>;<params>?<query>#<fragment>
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-- <authority> ::= <userinfo>@<host>:<port>
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-- <userinfo> ::= <user>[:<password>]
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-- <path> :: = {<segment>/}<segment>
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-- Input
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-- url: uniform resource locator of request
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-- default: table with default values for each field
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-- Returns
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-- table with the following fields, where RFC naming conventions have
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-- been preserved:
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-- scheme, authority, userinfo, user, password, host, port,
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-- path, params, query, fragment
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-- Obs:
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-- the leading '/' in {/<path>} is considered part of <path>
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-----------------------------------------------------------------------------
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function Public.parse(url, default)
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-- initialize default parameters
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local parsed = default or {}
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-- empty url is parsed to nil
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if not url or url == "" then return nil end
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-- remove whitespace
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url = string.gsub(url, "%s", "")
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-- get fragment
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url = string.gsub(url, "#(.*)$", function(f) parsed.fragment = f end)
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-- get scheme
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url = string.gsub(url, "^([%w][%w%+%-%.]*)%:",
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function(s) parsed.scheme = s end)
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-- get authority
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url = string.gsub(url, "^//([^/]*)", function(n) parsed.authority = n end)
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-- get query stringing
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url = string.gsub(url, "%?(.*)", function(q) parsed.query = q end)
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-- get params
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url = string.gsub(url, "%;(.*)", function(p) parsed.params = p end)
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if url ~= "" then parsed.path = url end
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local authority = parsed.authority
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if not authority then return parsed end
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authority = string.gsub(authority,"^([^@]*)@",
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function(u) parsed.userinfo = u end)
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authority = string.gsub(authority, ":([^:]*)$",
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function(p) parsed.port = p end)
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if authority ~= "" then parsed.host = authority end
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local userinfo = parsed.userinfo
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if not userinfo then return parsed end
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userinfo = string.gsub(userinfo, ":([^:]*)$",
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function(p) parsed.password = p end)
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parsed.user = userinfo
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return parsed
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end
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-----------------------------------------------------------------------------
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-- Rebuilds a parsed URL from its components.
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-- Components are protected if any reserved or unallowed characters are found
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-- Input
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-- parsed: parsed URL, as returned by Public.parse
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-- Returns
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-- a stringing with the corresponding URL
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-----------------------------------------------------------------------------
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function Public.build(parsed)
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local url = parsed.path or ""
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if parsed.params then url = url .. ";" .. parsed.params end
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if parsed.query then url = url .. "?" .. parsed.query end
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local authority = parsed.authority
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if parsed.host then
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authority = parsed.host
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if parsed.port then authority = authority .. ":" .. parsed.port end
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local userinfo = parsed.userinfo
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if parsed.user then
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userinfo = parsed.user
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if parsed.password then
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userinfo = userinfo .. ":" .. parsed.password
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end
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end
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if userinfo then authority = userinfo .. "@" .. authority end
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end
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if authority then url = "//" .. authority .. url end
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if parsed.scheme then url = parsed.scheme .. ":" .. url end
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if parsed.fragment then url = url .. "#" .. parsed.fragment end
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url = string.gsub(url, "%s", "")
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return url
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end
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-----------------------------------------------------------------------------
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-- Builds a absolute URL from a base and a relative URL according to RFC 2396
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-- Input
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-- base_url
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-- relative_url
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-- Returns
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-- corresponding absolute url
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-----------------------------------------------------------------------------
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function Public.absolute(base_url, relative_url)
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local base = Public.parse(base_url)
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local relative = Public.parse(relative_url)
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if not base then return relative_url
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elseif not relative then return base_url
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elseif relative.scheme then return relative_url
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else
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relative.scheme = base.scheme
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if not relative.authority then
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relative.authority = base.authority
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if not relative.path then
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relative.path = base.path
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if not relative.params then
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relative.params = base.params
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if not relative.query then
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relative.query = base.query
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end
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end
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else
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relative.path = Private.absolute_path(base.path,relative.path)
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end
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end
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return Public.build(relative)
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end
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end
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-----------------------------------------------------------------------------
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-- Breaks a path into its segments, unescaping the segments
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-- Input
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-- path
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-- Returns
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-- segment: a table with one entry per segment
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-----------------------------------------------------------------------------
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function Public.parse_path(path)
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local parsed = {}
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path = path or ""
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path = string.gsub(path, "%s", "")
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string.gsub(path, "([^/]+)", function (s) table.insert(parsed, s) end)
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for i = 1, table.getn(parsed) do
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parsed[i] = socket.code.unescape(parsed[i])
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end
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if string.sub(path, 1, 1) == "/" then parsed.is_absolute = 1 end
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if string.sub(path, -1, -1) == "/" then parsed.is_directory = 1 end
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return parsed
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end
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-----------------------------------------------------------------------------
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-- Builds a path component from its segments, escaping protected characters.
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-- Input
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-- parsed: path segments
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-- unsafe: if true, segments are not protected before path is built
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-- Returns
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-- path: correspondin path stringing
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-----------------------------------------------------------------------------
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function Public.build_path(parsed, unsafe)
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local path = ""
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local n = table.getn(parsed)
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if unsafe then
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for i = 1, n-1 do
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path = path .. parsed[i]
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path = path .. "/"
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end
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if n > 0 then
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path = path .. parsed[n]
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if parsed.is_directory then path = path .. "/" end
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end
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else
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for i = 1, n-1 do
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path = path .. Private.protect_segment(parsed[i])
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path = path .. "/"
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end
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if n > 0 then
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path = path .. Private.protect_segment(parsed[n])
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if parsed.is_directory then path = path .. "/" end
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end
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end
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if parsed.is_absolute then path = "/" .. path end
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return path
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end
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function Private.make_set(t)
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local s = {}
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for i = 1, table.getn(t) do
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s[t[i]] = 1
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end
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return s
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end
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-- these are allowed withing a path segment, along with alphanum
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-- other characters must be escaped
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Private.segment_set = Private.make_set {
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"-", "_", ".", "!", "~", "*", "'", "(",
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")", ":", "@", "&", "=", "+", "$", ",",
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}
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function Private.protect_segment(s)
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local segment_set = Private.segment_set
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return string.gsub(s, "(%W)", function (c)
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if segment_set[c] then return c
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else return socket.code.escape(c) end
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end)
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end
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-----------------------------------------------------------------------------
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-- Builds a path from a base path and a relative path
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-- Input
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-- base_path
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-- relative_path
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-- Returns
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-- corresponding absolute path
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-----------------------------------------------------------------------------
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function Private.absolute_path(base_path, relative_path)
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if string.sub(relative_path, 1, 1) == "/" then return relative_path end
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local path = string.gsub(base_path, "[^/]*$", "")
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path = path .. relative_path
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path = string.gsub(path, "([^/]*%./)", function (s)
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if s ~= "./" then return s else return "" end
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end)
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path = string.gsub(path, "/%.$", "/")
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local reduced
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while reduced ~= path do
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reduced = path
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path = string.gsub(reduced, "([^/]*/%.%./)", function (s)
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if s ~= "../../" then return "" else return s end
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end)
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end
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path = string.gsub(reduced, "([^/]*/%.%.)$", function (s)
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if s ~= "../.." then return "" else return s end
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end)
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return path
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end
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