mirror of
https://github.com/bjc/prosody.git
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312 lines
8.9 KiB
Lua
312 lines
8.9 KiB
Lua
-- Prosody IM
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-- Copyright (C) 2008-2010 Matthew Wild
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-- Copyright (C) 2008-2010 Waqas Hussain
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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local lxp = require "lxp";
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local st = require "prosody.util.stanza";
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local stanza_mt = st.stanza_mt;
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local error = error;
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local tostring = tostring;
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local t_insert = table.insert;
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local t_concat = table.concat;
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local t_remove = table.remove;
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local setmetatable = setmetatable;
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-- COMPAT: w/LuaExpat 1.1.0
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local lxp_supports_doctype = pcall(lxp.new, { StartDoctypeDecl = false });
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local lxp_supports_xmldecl = pcall(lxp.new, { XmlDecl = false });
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local lxp_supports_bytecount = not not lxp.new({}).getcurrentbytecount;
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local default_stanza_size_limit = 1024*1024*1; -- 1MB
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local _ENV = nil;
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-- luacheck: std none
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local new_parser = lxp.new;
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local xml_namespace = {
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["http://www.w3.org/XML/1998/namespace\1lang"] = "xml:lang";
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["http://www.w3.org/XML/1998/namespace\1space"] = "xml:space";
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["http://www.w3.org/XML/1998/namespace\1base"] = "xml:base";
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["http://www.w3.org/XML/1998/namespace\1id"] = "xml:id";
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};
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local xmlns_streams = "http://etherx.jabber.org/streams";
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local ns_separator = "\1";
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local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
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local function dummy_cb() end
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local function new_sax_handlers(session, stream_callbacks, cb_handleprogress)
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local xml_handlers = {};
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local cb_streamopened = stream_callbacks.streamopened;
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local cb_streamclosed = stream_callbacks.streamclosed;
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local cb_error = stream_callbacks.error or
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function(_, e, stanza)
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error("XML stream error: "..tostring(e)..(stanza and ": "..tostring(stanza) or ""),2);
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end;
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local cb_handlestanza = stream_callbacks.handlestanza;
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cb_handleprogress = cb_handleprogress or dummy_cb;
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local stream_ns = stream_callbacks.stream_ns or xmlns_streams;
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local stream_tag = stream_callbacks.stream_tag or "stream";
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if stream_ns ~= "" then
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stream_tag = stream_ns..ns_separator..stream_tag;
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end
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local stream_error_tag = stream_ns..ns_separator..(stream_callbacks.error_tag or "error");
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local stream_default_ns = stream_callbacks.default_ns;
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local stream_lang = "en";
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local stack = {};
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local chardata, stanza = {};
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local stanza_size = 0;
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local non_streamns_depth = 0;
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function xml_handlers:StartElement(tagname, attr)
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if stanza and #chardata > 0 then
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-- We have some character data in the buffer
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t_insert(stanza, t_concat(chardata));
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chardata = {};
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end
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local curr_ns,name = tagname:match(ns_pattern);
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if name == "" then
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curr_ns, name = "", curr_ns;
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end
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if curr_ns ~= stream_default_ns or non_streamns_depth > 0 then
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attr.xmlns = curr_ns;
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non_streamns_depth = non_streamns_depth + 1;
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end
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for i=1,#attr do
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local k = attr[i];
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attr[i] = nil;
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local xmlk = xml_namespace[k];
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if xmlk then
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attr[xmlk] = attr[k];
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attr[k] = nil;
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end
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end
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if not stanza then --if we are not currently inside a stanza
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if lxp_supports_bytecount then
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stanza_size = self:getcurrentbytecount();
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end
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if session.notopen then
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if tagname == stream_tag then
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non_streamns_depth = 0;
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stream_lang = attr["xml:lang"] or stream_lang;
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if cb_streamopened then
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if lxp_supports_bytecount then
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cb_handleprogress(stanza_size);
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stanza_size = 0;
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end
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cb_streamopened(session, attr);
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end
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else
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-- Garbage before stream?
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cb_error(session, "no-stream", tagname);
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end
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return;
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end
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if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then
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cb_error(session, "invalid-top-level-element");
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end
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stanza = setmetatable({ name = name, attr = attr, tags = {} }, stanza_mt);
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else -- we are inside a stanza, so add a tag
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if lxp_supports_bytecount then
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stanza_size = stanza_size + self:getcurrentbytecount();
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end
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t_insert(stack, stanza);
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local oldstanza = stanza;
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stanza = setmetatable({ name = name, attr = attr, tags = {} }, stanza_mt);
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t_insert(oldstanza, stanza);
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t_insert(oldstanza.tags, stanza);
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end
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end
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function xml_handlers:StartCdataSection()
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if lxp_supports_bytecount then
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if stanza then
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stanza_size = stanza_size + self:getcurrentbytecount();
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else
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cb_handleprogress(self:getcurrentbytecount());
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end
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end
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end
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function xml_handlers:EndCdataSection()
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if lxp_supports_bytecount then
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if stanza then
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stanza_size = stanza_size + self:getcurrentbytecount();
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else
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cb_handleprogress(self:getcurrentbytecount());
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end
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end
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end
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function xml_handlers:CharacterData(data)
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if stanza then
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if lxp_supports_bytecount then
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stanza_size = stanza_size + self:getcurrentbytecount();
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end
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t_insert(chardata, data);
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elseif lxp_supports_bytecount then
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cb_handleprogress(self:getcurrentbytecount());
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end
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end
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function xml_handlers:EndElement(tagname)
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if lxp_supports_bytecount then
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stanza_size = stanza_size + self:getcurrentbytecount()
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end
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if non_streamns_depth > 0 then
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non_streamns_depth = non_streamns_depth - 1;
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end
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if stanza then
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if #chardata > 0 then
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-- We have some character data in the buffer
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t_insert(stanza, t_concat(chardata));
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chardata = {};
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end
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-- Complete stanza
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if #stack == 0 then
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if lxp_supports_bytecount then
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cb_handleprogress(stanza_size);
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end
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stanza_size = 0;
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if stanza.attr["xml:lang"] == nil then
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stanza.attr["xml:lang"] = stream_lang;
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end
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if tagname ~= stream_error_tag then
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cb_handlestanza(session, stanza);
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else
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cb_error(session, "stream-error", stanza);
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end
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stanza = nil;
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else
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stanza = t_remove(stack);
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end
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else
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if lxp_supports_bytecount then
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cb_handleprogress(stanza_size);
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end
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if cb_streamclosed then
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cb_streamclosed(session);
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end
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end
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end
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local function restricted_handler(parser)
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cb_error(session, "parse-error", "restricted-xml", "Restricted XML, see RFC 6120 section 11.1.");
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if not parser.stop or not parser:stop() then
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error("Failed to abort parsing");
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end
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end
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if lxp_supports_xmldecl then
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function xml_handlers:XmlDecl(version, encoding, standalone)
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if lxp_supports_bytecount then
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cb_handleprogress(self:getcurrentbytecount());
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end
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if (encoding and encoding:lower() ~= "utf-8")
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or (standalone == "no")
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or (version and version ~= "1.0") then
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return restricted_handler(self);
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end
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end
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end
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if lxp_supports_doctype then
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xml_handlers.StartDoctypeDecl = restricted_handler;
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end
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xml_handlers.Comment = restricted_handler;
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xml_handlers.ProcessingInstruction = restricted_handler;
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local function reset()
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stanza, chardata, stanza_size = nil, {}, 0;
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stack = {};
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end
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local function set_session(stream, new_session) -- luacheck: ignore 212/stream
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session = new_session;
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end
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return xml_handlers, { reset = reset, set_session = set_session };
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end
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local function new(session, stream_callbacks, stanza_size_limit)
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-- Used to track parser progress (e.g. to enforce size limits)
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local n_outstanding_bytes = 0;
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local handle_progress;
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if lxp_supports_bytecount then
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function handle_progress(n_parsed_bytes)
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n_outstanding_bytes = n_outstanding_bytes - n_parsed_bytes;
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end
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stanza_size_limit = stanza_size_limit or default_stanza_size_limit;
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elseif stanza_size_limit then
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error("Stanza size limits are not supported on this version of LuaExpat")
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end
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local handlers, meta = new_sax_handlers(session, stream_callbacks, handle_progress);
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local parser = new_parser(handlers, ns_separator, false);
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local parse = parser.parse;
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function session.open_stream(session, from, to) -- luacheck: ignore 432/session
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local send = session.sends2s or session.send;
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local attr = {
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["xmlns:stream"] = "http://etherx.jabber.org/streams",
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["xml:lang"] = "en",
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xmlns = stream_callbacks.default_ns,
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version = session.version and (session.version > 0 and "1.0" or nil),
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id = session.streamid or "",
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from = from or session.host, to = to,
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};
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if session.stream_attrs then
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session:stream_attrs(from, to, attr)
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end
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send("<?xml version='1.0'?>"..st.stanza("stream:stream", attr):top_tag());
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return true;
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end
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return {
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reset = function ()
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parser = new_parser(handlers, ns_separator, false);
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parse = parser.parse;
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n_outstanding_bytes = 0;
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meta.reset();
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end,
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feed = function (self, data) -- luacheck: ignore 212/self
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if lxp_supports_bytecount then
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n_outstanding_bytes = n_outstanding_bytes + #data;
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end
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local _parser = parser;
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local ok, err = parse(_parser, data);
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if lxp_supports_bytecount and n_outstanding_bytes > stanza_size_limit then
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return nil, "stanza-too-large";
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end
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if parser ~= _parser then
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_parser:parse();
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_parser:close();
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end
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return ok, err;
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end,
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set_session = meta.set_session;
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set_stanza_size_limit = function (_, new_stanza_size_limit)
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stanza_size_limit = new_stanza_size_limit;
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end;
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};
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end
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return {
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ns_separator = ns_separator;
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ns_pattern = ns_pattern;
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new_sax_handlers = new_sax_handlers;
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new = new;
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};
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