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428 lines
11 KiB
428 lines
11 KiB
-- 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 t_insert = table.insert;
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local t_remove = table.remove;
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local t_concat = table.concat;
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local s_format = string.format;
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local s_match = string.match;
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local tostring = tostring;
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local setmetatable = setmetatable;
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local pairs = pairs;
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local ipairs = ipairs;
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local type = type;
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local s_gsub = string.gsub;
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local s_sub = string.sub;
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local s_find = string.find;
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local os = os;
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local do_pretty_printing = not os.getenv("WINDIR");
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local getstyle, getstring;
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if do_pretty_printing then
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local ok, termcolours = pcall(require, "util.termcolours");
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if ok then
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getstyle, getstring = termcolours.getstyle, termcolours.getstring;
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else
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do_pretty_printing = nil;
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end
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end
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local xmlns_stanzas = "urn:ietf:params:xml:ns:xmpp-stanzas";
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module "stanza"
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stanza_mt = { __type = "stanza" };
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stanza_mt.__index = stanza_mt;
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local stanza_mt = stanza_mt;
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function stanza(name, attr)
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local stanza = { name = name, attr = attr or {}, tags = {} };
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return setmetatable(stanza, stanza_mt);
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end
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local stanza = stanza;
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function stanza_mt:query(xmlns)
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return self:tag("query", { xmlns = xmlns });
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end
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function stanza_mt:body(text, attr)
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return self:tag("body", attr):text(text);
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end
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function stanza_mt:tag(name, attrs)
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local s = stanza(name, attrs);
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local last_add = self.last_add;
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if not last_add then last_add = {}; self.last_add = last_add; end
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(last_add[#last_add] or self):add_direct_child(s);
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t_insert(last_add, s);
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return self;
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end
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function stanza_mt:text(text)
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local last_add = self.last_add;
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(last_add and last_add[#last_add] or self):add_direct_child(text);
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return self;
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end
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function stanza_mt:up()
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local last_add = self.last_add;
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if last_add then t_remove(last_add); end
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return self;
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end
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function stanza_mt:reset()
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self.last_add = nil;
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return self;
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end
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function stanza_mt:add_direct_child(child)
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if type(child) == "table" then
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t_insert(self.tags, child);
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end
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t_insert(self, child);
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end
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function stanza_mt:add_child(child)
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local last_add = self.last_add;
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(last_add and last_add[#last_add] or self):add_direct_child(child);
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return self;
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end
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function stanza_mt:get_child(name, xmlns)
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for _, child in ipairs(self.tags) do
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if (not name or child.name == name)
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and ((not xmlns and self.attr.xmlns == child.attr.xmlns)
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or child.attr.xmlns == xmlns) then
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return child;
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end
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end
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end
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function stanza_mt:get_child_text(name, xmlns)
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local tag = self:get_child(name, xmlns);
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if tag then
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return tag:get_text();
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end
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return nil;
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end
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function stanza_mt:child_with_name(name)
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for _, child in ipairs(self.tags) do
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if child.name == name then return child; end
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end
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end
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function stanza_mt:child_with_ns(ns)
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for _, child in ipairs(self.tags) do
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if child.attr.xmlns == ns then return child; end
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end
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end
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function stanza_mt:children()
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local i = 0;
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return function (a)
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i = i + 1
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return a[i];
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end, self, i;
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end
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function stanza_mt:childtags(name, xmlns)
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local tags = self.tags;
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local start_i, max_i = 1, #tags;
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return function ()
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for i = start_i, max_i do
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local v = tags[i];
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if (not name or v.name == name)
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and ((not xmlns and self.attr.xmlns == v.attr.xmlns)
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or v.attr.xmlns == xmlns) then
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start_i = i+1;
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return v;
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end
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end
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end;
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end
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function stanza_mt:maptags(callback)
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local tags, curr_tag = self.tags, 1;
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local n_children, n_tags = #self, #tags;
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local i = 1;
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while curr_tag <= n_tags and n_tags > 0 do
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if self[i] == tags[curr_tag] then
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local ret = callback(self[i]);
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if ret == nil then
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t_remove(self, i);
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t_remove(tags, curr_tag);
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n_children = n_children - 1;
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n_tags = n_tags - 1;
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i = i - 1;
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curr_tag = curr_tag - 1;
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else
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self[i] = ret;
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tags[curr_tag] = ret;
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end
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curr_tag = curr_tag + 1;
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end
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i = i + 1;
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end
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return self;
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end
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function stanza_mt:find(path)
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local pos = 1;
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local len = #path + 1;
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repeat
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local xmlns, name, text;
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local char = s_sub(path, pos, pos);
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if char == "@" then
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return self.attr[s_sub(path, pos + 1)];
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elseif char == "{" then
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xmlns, pos = s_match(path, "^([^}]+)}()", pos + 1);
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end
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name, text, pos = s_match(path, "^([^@/#]*)([/#]?)()", pos);
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name = name ~= "" and name or nil;
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if pos == len then
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if text == "#" then
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return self:get_child_text(name, xmlns);
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end
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return self:get_child(name, xmlns);
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end
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self = self:get_child(name, xmlns);
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until not self
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end
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local xml_escape
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do
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local escape_table = { ["'"] = "'", ["\""] = """, ["<"] = "<", [">"] = ">", ["&"] = "&" };
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function xml_escape(str) return (s_gsub(str, "['&<>\"]", escape_table)); end
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_M.xml_escape = xml_escape;
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end
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local function _dostring(t, buf, self, xml_escape, parentns)
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local nsid = 0;
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local name = t.name
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t_insert(buf, "<"..name);
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for k, v in pairs(t.attr) do
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if s_find(k, "\1", 1, true) then
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local ns, attrk = s_match(k, "^([^\1]*)\1?(.*)$");
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nsid = nsid + 1;
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t_insert(buf, " xmlns:ns"..nsid.."='"..xml_escape(ns).."' ".."ns"..nsid..":"..attrk.."='"..xml_escape(v).."'");
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elseif not(k == "xmlns" and v == parentns) then
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t_insert(buf, " "..k.."='"..xml_escape(v).."'");
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end
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end
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local len = #t;
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if len == 0 then
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t_insert(buf, "/>");
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else
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t_insert(buf, ">");
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for n=1,len do
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local child = t[n];
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if child.name then
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self(child, buf, self, xml_escape, t.attr.xmlns);
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else
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t_insert(buf, xml_escape(child));
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end
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end
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t_insert(buf, "</"..name..">");
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end
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end
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function stanza_mt.__tostring(t)
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local buf = {};
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_dostring(t, buf, _dostring, xml_escape, nil);
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return t_concat(buf);
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end
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function stanza_mt.top_tag(t)
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local attr_string = "";
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if t.attr then
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for k, v in pairs(t.attr) do if type(k) == "string" then attr_string = attr_string .. s_format(" %s='%s'", k, xml_escape(tostring(v))); end end
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end
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return s_format("<%s%s>", t.name, attr_string);
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end
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function stanza_mt.get_text(t)
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if #t.tags == 0 then
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return t_concat(t);
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end
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end
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function stanza_mt.get_error(stanza)
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local type, condition, text;
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local error_tag = stanza:get_child("error");
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if not error_tag then
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return nil, nil, nil;
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end
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type = error_tag.attr.type;
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for _, child in ipairs(error_tag.tags) do
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if child.attr.xmlns == xmlns_stanzas then
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if not text and child.name == "text" then
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text = child:get_text();
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elseif not condition then
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condition = child.name;
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end
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if condition and text then
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break;
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end
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end
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end
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return type, condition or "undefined-condition", text;
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end
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do
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local id = 0;
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function new_id()
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id = id + 1;
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return "lx"..id;
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end
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end
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function preserialize(stanza)
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local s = { name = stanza.name, attr = stanza.attr };
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for _, child in ipairs(stanza) do
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if type(child) == "table" then
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t_insert(s, preserialize(child));
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else
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t_insert(s, child);
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end
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end
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return s;
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end
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function deserialize(stanza)
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-- Set metatable
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if stanza then
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local attr = stanza.attr;
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for i=1,#attr do attr[i] = nil; end
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local attrx = {};
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for att in pairs(attr) do
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if s_find(att, "|", 1, true) and not s_find(att, "\1", 1, true) then
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local ns,na = s_match(att, "^([^|]+)|(.+)$");
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attrx[ns.."\1"..na] = attr[att];
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attr[att] = nil;
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end
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end
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for a,v in pairs(attrx) do
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attr[a] = v;
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end
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setmetatable(stanza, stanza_mt);
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for _, child in ipairs(stanza) do
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if type(child) == "table" then
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deserialize(child);
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end
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end
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if not stanza.tags then
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-- Rebuild tags
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local tags = {};
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for _, child in ipairs(stanza) do
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if type(child) == "table" then
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t_insert(tags, child);
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end
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end
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stanza.tags = tags;
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end
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end
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return stanza;
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end
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local function _clone(stanza)
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local attr, tags = {}, {};
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for k,v in pairs(stanza.attr) do attr[k] = v; end
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local new = { name = stanza.name, attr = attr, tags = tags };
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for i=1,#stanza do
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local child = stanza[i];
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if child.name then
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child = _clone(child);
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t_insert(tags, child);
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end
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t_insert(new, child);
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end
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return setmetatable(new, stanza_mt);
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end
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clone = _clone;
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function message(attr, body)
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if not body then
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return stanza("message", attr);
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else
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return stanza("message", attr):tag("body"):text(body):up();
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end
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end
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function iq(attr)
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if attr and not attr.id then attr.id = new_id(); end
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return stanza("iq", attr or { id = new_id() });
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end
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function reply(orig)
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return stanza(orig.name, orig.attr and { to = orig.attr.from, from = orig.attr.to, id = orig.attr.id, type = ((orig.name == "iq" and "result") or orig.attr.type) });
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end
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do
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local xmpp_stanzas_attr = { xmlns = xmlns_stanzas };
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function error_reply(orig, type, condition, message)
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local t = reply(orig);
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t.attr.type = "error";
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t:tag("error", {type = type}) --COMPAT: Some day xmlns:stanzas goes here
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:tag(condition, xmpp_stanzas_attr):up();
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if (message) then t:tag("text", xmpp_stanzas_attr):text(message):up(); end
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return t; -- stanza ready for adding app-specific errors
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end
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end
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function presence(attr)
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return stanza("presence", attr);
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end
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if do_pretty_printing then
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local style_attrk = getstyle("yellow");
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local style_attrv = getstyle("red");
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local style_tagname = getstyle("red");
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local style_punc = getstyle("magenta");
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local attr_format = " "..getstring(style_attrk, "%s")..getstring(style_punc, "=")..getstring(style_attrv, "'%s'");
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local top_tag_format = getstring(style_punc, "<")..getstring(style_tagname, "%s").."%s"..getstring(style_punc, ">");
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--local tag_format = getstring(style_punc, "<")..getstring(style_tagname, "%s").."%s"..getstring(style_punc, ">").."%s"..getstring(style_punc, "</")..getstring(style_tagname, "%s")..getstring(style_punc, ">");
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local tag_format = top_tag_format.."%s"..getstring(style_punc, "</")..getstring(style_tagname, "%s")..getstring(style_punc, ">");
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function stanza_mt.pretty_print(t)
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local children_text = "";
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for n, child in ipairs(t) do
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if type(child) == "string" then
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children_text = children_text .. xml_escape(child);
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else
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children_text = children_text .. child:pretty_print();
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end
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end
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local attr_string = "";
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if t.attr then
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for k, v in pairs(t.attr) do if type(k) == "string" then attr_string = attr_string .. s_format(attr_format, k, tostring(v)); end end
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end
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return s_format(tag_format, t.name, attr_string, children_text, t.name);
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end
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function stanza_mt.pretty_top_tag(t)
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local attr_string = "";
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if t.attr then
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for k, v in pairs(t.attr) do if type(k) == "string" then attr_string = attr_string .. s_format(attr_format, k, tostring(v)); end end
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end
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return s_format(top_tag_format, t.name, attr_string);
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end
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else
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-- Sorry, fresh out of colours for you guys ;)
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stanza_mt.pretty_print = stanza_mt.__tostring;
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stanza_mt.pretty_top_tag = stanza_mt.top_tag;
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end
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return _M;
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