/usr/share/lua/5.1/xavante/davhandler.lua is in xavante 2.3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- Xavante webDAV handler
-- Author: Javier Guerra
-- Copyright (c) 2005 Javier Guerra
-----------------------------------------------------------------------------
require "lxp.lom"
require "socket.url"
local httpd = require "xavante.httpd"
local url = socket.url
-- returns a copy of the string without any
-- leading or trailing whitespace
local function trim (s)
return (string.gsub (string.gsub (s, "^%s*", ""), "%s*$", ""))
end
-- reverts a LOM-style attribute array to XML form
local function attrstostr (a)
local out = {}
for i,attr in ipairs (a) do
table.insert (out, string.format ('%s = "%s"', attr, a[attr]))
end
return table.concat (out, " ")
end
-- outputs a LOM XML object back in XML text form
-- params:
-- x: LOM XML object
-- of: output function, uses print() if not given
local function lomtoxml (x, of)
if type (x) == "string" then
return of (x)
end
of = of or print
local attrs = ""
-- does it have any attributes?
if x.attr [1] then
attrs = " " .. attrstostr (x.attr)
end
-- is there any content?
if x[1] then
of ("<" .. x.tag .. attrs .. ">")
for i in ipairs (x) do
lomtoxml (x[i], of)
end
of ("</".. x.tag .. ">")
else
of ("<" .. x.tag .. attrs .. "/>")
end
end
-- gets request content, and parses it as XML
-- returns LOM object
local function req_xml (req)
local sz = req.headers ["content-length"]
local indata
if sz then
indata = req.socket:receive (sz)
else
indata = function () return req.socket:receive () end
end
return lxp.lom.parse (indata)
end
-- expands namespace tags in-situ
-- returns the same LOM object after processing
local function xml_ns (x, dict)
if not x then return end
if type (x) == "string" then return x end
dict = dict or {}
-- adds any new namespace to the dictionary
for i,attr_name in ipairs (x.attr) do
-- default namespace
if attr_name == "xmlns" then
dict [""] = x.attr [attr_name]
end
-- named namespaces
local _,_, ns_var = string.find (attr_name, "xmlns:(.*)$")
if ns_var then
dict [ns_var] = x.attr [attr_name]
end
end
-- modifies this node's tag
local _,_, ns = string.find (x.tag, "^(.*):")
if ns and dict [ns] then
local pat = string.format ("^%s:", ns)
x.tag = string.gsub (x.tag, pat, dict[ns])
end
if not ns and dict [""] then
x.tag = dict [""] .. x.tag
end
-- recurses to child nodes
for _, sub in ipairs (x) do
xml_ns (sub, dict)
end
return x
end
-- iterator for traversing only childs in a LOM object
-- whith a given tagname.
local function lomChildsByTagName (x, tagname)
if not x then
return function () return nil end
end
local function gen (x)
for _,elem in ipairs (x) do
if type(elem) == "table" then
if elem.tag and elem.tag == tagname then
coroutine.yield (elem)
end
end
end
end
return coroutine.wrap (function () gen (x) end)
end
-- iterator for traversing all elements in a LOM object
-- whith a given tagname (at any depth).
local function lomElementsByTagName (x, tagname)
if not x then
return function () return nil end
end
local function gen (x)
for _,elem in ipairs (x) do
if type(elem) == "table" then
if elem.tag and elem.tag == tagname then
coroutine.yield (elem)
end
gen (elem)
end
end
end
return coroutine.wrap (function () gen (x) end)
end
-- iterates on the childs of a LOM node
-- use as:
-- for subnode, tagname in lomChilds (node) do ... end
local function lomChilds (x)
if not x then
return function () return nil end
end
local function gen ()
for _, elem in ipairs (x) do
if type (elem) == "table" and elem.tag then
coroutine.yield (elem, elem.tag)
end
end
end
return coroutine.wrap (gen)
end
-- returns all the text content of a LOM node
local function lomContent (x)
if not x then
return ""
end
local out = {}
local function of (s)
table.insert (out, s)
end
for _, child in ipairs (x) do
lomtoxml (child, of)
end
return table.concat (out)
end
-- returns a table member of a table, creates it if needed
-- params:
-- t: table
-- k: key
local function maketabletable (t,k)
t[k] = t[k] or {}
return t[k]
end
-- if a tagname has inconvenient characters
-- replaces part of if with a (possibly new)
-- namespace reference
-- params:
-- ns: namespace dictionary
-- name: tagname to reduce
-- returns new tagname, ns is modified in-place if needed
local function reducename (ns, name)
if string.find (name, "[:/?#]") then
local _,_,pfx,sfx = string.find (name, "(.*%W)(%w+)")
local n = 0
for k,v in pairs (ns) do
n = n+1
if v == pfx then
return string.format ("%s:%s", k, sfx)
end
end
local newns = "lm"..n
ns [newns] = pfx
return string.format ("%s:%s", newns, sfx)
else
return name
end
end
-- returns a XML attr string encoding a namespace dictionary
local function nsattr (ns)
local attr = {}
for k,v in pairs (ns) do
table.insert (attr, string.format ([[xmlns:%s="%s"]], k, v))
end
return table.concat (attr, " ")
end
local function addProp (outtable, propname, propval)
if propval then
local propentry = maketabletable (outtable, "HTTP/1.1 200 OK")
if propval == "" then
table.insert (propentry, string.format ([[<%s/>]], propname))
else
table.insert (propentry,
string.format ([[<%s>%s</%s>]],
propname, propval, propname))
end
else
local propentry = maketabletable (outtable, "HTTP/1.1 404 NotFound")
table.insert (propentry, string.format ([[<%s/>]], propname))
end
end
local function addPropstat (outtable, propstat)
local codes = {}
for stat in pairs (propstat) do
table.insert (codes, stat)
end
table.sort (codes)
for _, stat in ipairs (codes) do
props = propstat [stat]
if props then
table.insert (outtable, [[<D:propstat>]])
table.insert (outtable, [[<D:prop>]])
for _,prop in ipairs (props) do
table.insert (outtable, prop)
end
table.insert (outtable, [[</D:prop>]])
table.insert (outtable, string.format ([[<D:status>%s</D:status>]], stat))
table.insert (outtable, [[</D:propstat>]])
end
end
end
local function dav_propfind (req, res, repos_b, props_b)
res.statusline = "HTTP/1.1 207 Multi-Status"
res.headers ["Content-Type"] = 'text/xml; charset="utf-8"'
local depth = req.headers.depth
local path = req.relpath
local data = xml_ns (req_xml (req))
-- print ("path:", path, req.relpath)
-- print ("depth:", depth)
-- print ("como xml:") lomtoxml (data) print ()
local resource_q = repos_b:getResource (req.match, path)
if not resource_q then
return httpd.err_404 (req, res)
end
local content = {}
table.insert (content, [[<?xml version="1.0" encoding="utf-8" ?>]])
table.insert (content, [[<D:multistatus xmlns:D="DAV:">]])
local namespace = {}
assert (data.tag == "DAV:propfind")
for resource in resource_q:getItems (depth) do
-- print ("resource:", resource.path)
local propstat = {}
namespace.D="DAV:"
for findtype, findtype_tn in lomChilds (data) do
if findtype_tn == "DAV:prop" then
for _, propname in lomChilds (findtype) do
local propval = resource:getProp (propname)
if not propval and props_b then
propval = props_b:getProp (req.relpath, propname)
end
local shortname = reducename (namespace, propname)
addProp (propstat, shortname, propval)
end
elseif findtype_tn == "DAV:propname" then
for propname in resource:getPropNames () do
local shortname = reducename (namespace, propname)
addProp (propstat, shortname, "")
end
if props_b then
for propname in props_b:getPropNames (req.relpath) do
local shortname = reducename (namespace, propname)
addProp (propstat, shortname, "")
end
end
elseif findtype_tn == "DAV:allprop" then
for propname in resource:getPropNames () do
local shortname = reducename (namespace, propname)
local propval = resource:getProp (propname)
addProp (propstat, shortname, propval)
end
if props_b then
for propname in props_b:getPropNames (req.relpath) do
local shortname = reducename (namespace, propname)
local propval = props_b:getProp (req.relpath, propname)
addProp (propstat, shortname, propval)
end
end
end
end
namespace.D = nil
table.insert (content, string.format ([[<D:response %s>]], nsattr (namespace)))
table.insert (content, string.format ([[<D:href>%s</D:href>]], resource:getHRef()))
addPropstat (content, propstat)
table.insert (content, [[</D:response>]])
end
table.insert (content, [[</D:multistatus>]])
-- for _,l in ipairs (content) do print (l) end
res.content = content
return res
end
local function dav_proppatch (req, res, repos_b, props_b)
res.statusline = "HTTP/1.1 207 Multi-Status"
res.headers ["Content-Type"] = 'text/xml; charset="utf-8"'
local path = req.relpath
local data = xml_ns (req_xml (req))
-- print ("como xml:") lomtoxml (data) print ()
local resource = repos_b:getResource (req.match, path)
if not resource then
return httpd.err_404 (req, res)
end
local content = {}
table.insert (content, [[<?xml version="1.0" encoding="utf-8" ?>]])
local namespace = {D="DAV:"}
local propstat = {}
assert (data.tag == "DAV:propertyupdate")
for cmd_node, cmd_name in lomChilds (data) do
for nd in lomChildsByTagName (cmd_node, "DAV:prop") do
local status = nil
for prop_node, propname in lomChilds (nd) do
if cmd_name == "DAV:set" then
props_b:setProp (path, propname, lomContent (prop_node))
status = "HTTP/1.1 200 OK"
elseif cmd_name == "DAV:remove" then
props_b:setProp (path, propname, nil)
status = "HTTP/1.1 200 OK"
end
if status then
local propentry = maketabletable (content, status)
table.insert (propentry, string.format ([[<%s/>]], reducename (namespace, propname)))
end
end
end
end
table.insert (content, string.format ([[<D:multistatus %s>]], nsattr (namespace)))
table.insert (content, [[<D:response>]])
table.insert (content, string.format ([[<D:href>%s</D:href>]], resource:getHRef()))
addPropstat (content, propstat)
table.insert (content, [[</D:response>]])
table.insert (content, [[</D:multistatus>]])
res.content = content
return res
end
local function dav_options (req, res, repos_b, props_b)
res.headers ["DAV"] = "1,2"
res.content = ""
return res
end
local function dav_get (req, res, repos_b, props_b)
local resource = repos_b:getResource (req.match, req.relpath)
if not resource then
return httpd.err_404 (req, res)
end
res.headers ["Content-Type"] = resource:getContentType ()
res.headers ["Content-Length"] = resource:getContentSize () or 0
res:send_headers ()
for block in resource:getContentData () do
res:send_data (block)
end
return res
end
local function dav_put (req, res, repos_b)
local path = req.relpath
local resource = repos_b:getResource (req.match, path)
or repos_b:createResource (req.match, path)
if req.headers["content-range"] then
return httpd.err_405 (req, res)
end
local contentlength = assert (req.headers ["content-length"]) + 0
local bsz
while contentlength > 0 do
if contentlength > 4096 then bsz = 4096 else bsz = contentlength end
resource:addContentData (req.socket:receive (bsz))
contentlength = contentlength - bsz
end
res:send_headers ()
return res
end
local function dav_mkcol (req, res, repos_b)
local path = req.relpath
local resource = repos_b:getResource (req.match, path)
if resource then
res.statusline = "HTTP/1.1 405 Method Not Allowed"
res.content = ""
return res
end
local done, err = repos_b:createCollection (req.match, path)
if done then
res.statusline = "HTTP/1.1 201 Created"
else
res.statusline = "HTTP/1.1 403 Forbidden"
end
res.content = ""
return res
end
local function dav_delete (req, res, repos_b, props_b)
local path = req.relpath
local resource = repos_b:getResource (req.match, path)
if not resource then
return http.err_404
end
-- NOTE: this should iterate depth-first
for r in resource:getItems ("Infinity") do
local ok, err = resource:delete ()
if not ok then
res.statusline = "HTTP/1.1 207 Multi-Status"
res.content = string.format ([[
<?xml version="1.0" encoding="utf-8" ?>
<d:multistatus xmlns:d="DAV:">
<d:response>
<d:href>%s</d:href>
<d:status>%s</d:status>
</d:response>
</d:multistatus>]], resource:getHRef(), err)
return res
end
props_b:delete (resource:getPath ()) -- TODO
end
--res.statusline = "HTTP/1.1 204 No Content"
local done, err = resource:delete ()
if done then
res.statusline = "HTTP/1.1 204 No Content"
props_b:delete (path)
else
res.statusline = "HTTP/1.1 403 Forbidden"
end
res.content = ""
return res
end
local function dav_lock (req, res, repos_b)
local data = xml_ns (req_xml (req))
print ("como xml:") lomtoxml (data) print ()
return res
end
local dav_cmd_dispatch = {
PROPFIND = dav_propfind,
PROPPATCH = dav_proppatch,
OPTIONS = dav_options,
GET = dav_get,
PUT = dav_put,
MKCOL = dav_mkcol,
DELETE = dav_delete,
LOCK = dav_lock,
}
function xavante.davhandler (params)
return function (req, res)
-- print (req.cmd_mth, req.parsed_url.path)
-- for k,v in pairs (req.headers) do print (k,v) end
local savePath = req.parsed_url.path
req.parsed_url.path = '/'
req.match = socket.url.build(req.parsed_url)
req.parsed_url.path = savePath
local dav_handler = dav_cmd_dispatch [req.cmd_mth]
if dav_handler then
return dav_handler (req, res, params.repos_b, params.props_b)
end
end
end
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