couchapi.lib.lua

local setmetatable = setmetatable;
local pcall = pcall;
local type = type;
local t_concat = table.concat;
local print = print;

local socket_url = require "socket.url";
local http = require "socket.http";
local ltn12 = require "ltn12";

--local json = require "json";
local json = module:require("couchdb/json");

--module("couchdb")
local _M = {};

local function urlcat(url, path)
	return url:gsub("/*$", "").."/"..path:gsub("^/*", "");
end

local doc_mt = {};
doc_mt.__index = doc_mt;

function doc_mt:get()
	return self.db:get(socket_url.escape(self.id));
end
function doc_mt:put(val)
	return self.db:put(socket_url.escape(self.id), val);
end
function doc_mt:__tostring()
	return "couchdb.doc("..self.url..")";
end


local db_mt = {};
db_mt.__index = db_mt;

function db_mt:__tostring()
	return "couchdb.db("..self.url..")";
end
function db_mt:doc(id)
	local url = urlcat(self.url, socket_url.escape(id));
	return setmetatable({ url = url, db = self, id = id }, doc_mt);
end
function db_mt:get(id)
	local url = urlcat(self.url, id);
	local a,b = http.request(url);
	local r,x = pcall(json.decode, a);
	if r then a = x; end
	return a,b;
end
function db_mt:put(id, value)
	local url = urlcat(self.url, id);
	if type(value) == "table" then
		value = json.encode(value);
	elseif value ~= nil and type(value) ~= "string" then
		return nil, "Invalid type";
	end
	local t = {};
	local a,b = http.request {
		url = url,
		sink = ltn12.sink.table(t),
		source = ltn12.source.string(value),
		method = "PUT",
		headers = {
			["Content-Length"] = #value,
			["Content-Type"] = "application/json"
		}
	};
	a = t_concat(t);
	local r,x = pcall(json.decode, a);
	if r then a = x; end
	return a,b;
end


local server_mt = {};
server_mt.__index = server_mt;

function server_mt:db(name)
	local url = urlcat(self.url, socket_url.escape(name));
	return setmetatable({ url = url }, db_mt);
end
function server_mt:__tostring()
	return "couchdb.server("..self.url..")";
end


function _M.server(url)
	return setmetatable({ url = url }, server_mt);
end
function _M.db(url)
	return setmetatable({ url = url }, db_mt);
end

return _M;

couchdb.lib.lua

local http = require "socket.http";
local url = require "socket.url";

local couchapi = module:require("couchdb/couchapi");
local json = module:require("couchdb/json");

local couchdb_url = assert(module:get_option("couchdb_url"), "Option couchdb_url not specified");
local db = couchapi.db(couchdb_url);

local function couchdb_get(key)
	local a,b = db:doc(key):get()
	print(json.encode(a));
	if b == 404 then return nil; end
	if b == 200 then b = nil; end
	return a.payload,b;
end

local function couchdb_put(key, value)
	local a,b = db:doc(key):get();
	return db:doc(key):put({ payload = value, _rev = a and a._rev });
end

local st = require "util.stanza";

local handlers = {};

handlers.accounts = {
	get = function(self, user)
		return couchdb_get(self.host.."/"..user.."/account");
	end;
	set = function(self, user, data)
		return couchdb_put(self.host.."/"..user.."/account", data);
	end;
};
handlers.vcard = {
	get = function(self, user)
		return couchdb_get(self.host.."/"..user.."/vcard");
	end;
	set = function(self, user, data)
		return couchdb_put(self.host.."/"..user.."/vcard", data);
	end;
};
handlers.private = {
	get = function(self, user)
		return couchdb_get(self.host.."/"..user.."/private");
	end;
	set = function(self, user, data)
		return couchdb_put(self.host.."/"..user.."/private", data);
	end;
};
handlers.roster = {
	get = function(self, user)
		return couchdb_get(self.host.."/"..user.."/roster");
	end;
	set = function(self, user, data)
		return couchdb_put(self.host.."/"..user.."/roster", data);
	end;
};

-----------------------------
local driver = {};
driver.__index = driver;

function driver:open(host, datastore, typ)
	local cache_key = host.." "..datastore;
	if self.ds_cache[cache_key] then return self.ds_cache[cache_key]; end
	local instance = setmetatable({}, self);
	instance.host = host;
	instance.datastore = datastore;
	local handler = handlers[datastore];
	if not handler then return nil; end
	for key,val in pairs(handler) do
		instance[key] = val;
	end
	if instance.init then instance:init(); end
	self.ds_cache[cache_key] = instance;
	return instance;
end

-----------------------------
local _M = {};

function _M.new()
	local instance = setmetatable({}, driver);
	instance.__index = instance;
	instance.ds_cache = {};
	return instance;
end

return _M;

json.lib.lua

local type = type;
local t_insert, t_concat, t_remove = table.insert, table.concat, table.remove;
local s_char = string.char;
local tostring, tonumber = tostring, tonumber;
local pairs, ipairs = pairs, ipairs;
local next = next;
local error = error;
local newproxy, getmetatable = newproxy, getmetatable;
local print = print;

--module("json")
local _M = {};

local null = newproxy and newproxy(true) or {};
if getmetatable and getmetatable(null) then
	getmetatable(null).__tostring = function() return "null"; end;
end
_M.null = null;

local escapes = {
	["\""] = "\\\"", ["\\"] = "\\\\", ["\b"] = "\\b",
	["\f"] = "\\f", ["\n"] = "\\n", ["\r"] = "\\r", ["\t"] = "\\t"};
local unescapes = {
	["\""] = "\"", ["\\"] = "\\", ["/"] = "/",
	b = "\b", f = "\f", n = "\n", r = "\r", t = "\t"};
for i=0,31 do
	local ch = s_char(i);
	if not escapes[ch] then escapes[ch] = ("\\u%.4X"):format(i); end
end

local valid_types = {
	number  = true,
	string  = true,
	table   = true,
	boolean = true
};
local special_keys = {
	__array = true;
	__hash  = true;
};

local simplesave, tablesave, arraysave, stringsave;

function stringsave(o, buffer)
	-- FIXME do proper utf-8 and binary data detection
	t_insert(buffer, "\""..(o:gsub(".", escapes)).."\"");
end

function arraysave(o, buffer)
	t_insert(buffer, "[");
	if next(o) then
		for i,v in ipairs(o) do
			simplesave(v, buffer);
			t_insert(buffer, ",");
		end
		t_remove(buffer);
	end
	t_insert(buffer, "]");
end

function tablesave(o, buffer)
	local __array = {};
	local __hash = {};
	local hash = {};
	for i,v in ipairs(o) do
		__array[i] = v;
	end
	for k,v in pairs(o) do
		local ktype, vtype = type(k), type(v);
		if valid_types[vtype] or v == null then
			if ktype == "string" and not special_keys[k] then
				hash[k] = v;
			elseif (valid_types[ktype] or k == null) and __array[k] == nil then
				__hash[k] = v;
			end
		end
	end
	if next(__hash) ~= nil or next(hash) ~= nil or next(__array) == nil then
		t_insert(buffer, "{");
		local mark = #buffer;
		for k,v in pairs(hash) do
			stringsave(k, buffer);
			t_insert(buffer, ":");
			simplesave(v, buffer);
			t_insert(buffer, ",");
		end
		if next(__hash) ~= nil then
			t_insert(buffer, "\"__hash\":[");
			for k,v in pairs(__hash) do
				simplesave(k, buffer);
				t_insert(buffer, ",");
				simplesave(v, buffer);
				t_insert(buffer, ",");
			end
			t_remove(buffer);
			t_insert(buffer, "]");
			t_insert(buffer, ",");
		end
		if next(__array) then
			t_insert(buffer, "\"__array\":");
			arraysave(__array, buffer);
			t_insert(buffer, ",");
		end
		if mark ~= #buffer then t_remove(buffer); end
		t_insert(buffer, "}");
	else
		arraysave(__array, buffer);
	end
end

function simplesave(o, buffer)
	local t = type(o);
	if t == "number" then
		t_insert(buffer, tostring(o));
	elseif t == "string" then
		stringsave(o, buffer);
	elseif t == "table" then
		tablesave(o, buffer);
	elseif t == "boolean" then
		t_insert(buffer, (o and "true" or "false"));
	else
		t_insert(buffer, "null");
	end
end

function _M.encode(obj)
	local t = {};
	simplesave(obj, t);
	return t_concat(t);
end

-----------------------------------


function _M.decode(json)
	local pos = 1;
	local current = {};
	local stack = {};
	local ch, peek;
	local function next()
		ch = json:sub(pos, pos);
		pos = pos+1;
		peek = json:sub(pos, pos);
		return ch;
	end
	
	local function skipwhitespace()
		while ch and (ch == "\r" or ch == "\n" or ch == "\t" or ch == " ") do
			next();
		end
	end
	local function skiplinecomment()
		repeat next(); until not(ch) or ch == "\r" or ch == "\n";
		skipwhitespace();
	end
	local function skipstarcomment()
		next(); next(); -- skip '/', '*'
		while peek and ch ~= "*" and peek ~= "/" do next(); end
		if not peek then error("eof in star comment") end
		next(); next(); -- skip '*', '/'
		skipwhitespace();
	end
	local function skipstuff()
		while true do
			skipwhitespace();
			if ch == "/" and peek == "*" then
				skipstarcomment();
			elseif ch == "/" and peek == "*" then
				skiplinecomment();
			else
				return;
			end
		end
	end
	
	local readvalue;
	local function readarray()
		local t = {};
		next(); -- skip '['
		skipstuff();
		if ch == "]" then next(); return t; end
		t_insert(t, readvalue());
		while true do
			skipstuff();
			if ch == "]" then next(); return t; end
			if not ch then error("eof while reading array");
			elseif ch == "," then next();
			elseif ch then error("unexpected character in array, comma expected"); end
			if not ch then error("eof while reading array"); end 
			t_insert(t, readvalue());
		end
	end
	
	local function checkandskip(c)
		local x = ch or "eof";
		if x ~= c then error("unexpected "..x..", '"..c.."' expected"); end
		next();
	end
	local function readliteral(lit, val)
		for c in lit:gmatch(".") do
			checkandskip(c);
		end
		return val;
	end
	local function readstring()
		local s = "";
		checkandskip("\"");
		while ch do
			while ch and ch ~= "\\" and ch ~= "\"" do
				s = s..ch; next();
			end
			if ch == "\\" then
				next();
				if unescapes[ch] then
					s = s..unescapes[ch];
					next();
				elseif ch == "u" then
					local seq = "";
					for i=1,4 do
						next();
						if not ch then error("unexpected eof in string"); end
						if not ch:match("[0-9a-fA-F]") then error("invalid unicode escape sequence in string"); end
						seq = seq..ch;
					end
					s = s..s.char(tonumber(seq, 16)); -- FIXME do proper utf-8
					next();
				else error("invalid escape sequence in string"); end
			end
			if ch == "\"" then
				next();
				return s;
			end
		end
		error("eof while reading string");
	end
	local function readnumber()
		local s = "";
		if ch == "-" then
			s = s..ch; next();
			if not ch:match("[0-9]") then error("number format error"); end
		end
		if ch == "0" then
			s = s..ch; next();
			if ch:match("[0-9]") then error("number format error"); end
		else
			while ch and ch:match("[0-9]") do
				s = s..ch; next();
			end
		end
		if ch == "." then
			s = s..ch; next();
			if not ch:match("[0-9]") then error("number format error"); end
			while ch and ch:match("[0-9]") do
				s = s..ch; next();
			end
			if ch == "e" or ch == "E" then
				s = s..ch; next();
				if ch == "+" or ch == "-" then
					s = s..ch; next();
					if not ch:match("[0-9]") then error("number format error"); end
					while ch and ch:match("[0-9]") do
						s = s..ch; next();
					end
				end
			end
		end
		return tonumber(s);
	end
	local function readmember(t)
		local k = readstring();
		checkandskip(":");
		t[k] = readvalue();
	end
	local function fixobject(obj)
		local __array = obj.__array;
		if __array then
			obj.__array = nil;
			for i,v in ipairs(__array) do
				t_insert(obj, v);
			end
		end
		local __hash = obj.__hash;
		if __hash then
			obj.__hash = nil;
			local k;
			for i,v in ipairs(__hash) do
				if k ~= nil then
					obj[k] = v; k = nil;
				else
					k = v;
				end
			end
		end
		return obj;
	end
	local function readobject()
		local t = {};
		next(); -- skip '{'
		skipstuff();
		if ch == "}" then next(); return t; end
		if not ch then error("eof while reading object"); end
		readmember(t);
		while true do
			skipstuff();
			if ch == "}" then next(); return fixobject(t); end
			if not ch then error("eof while reading object");
			elseif ch == "," then next();
			elseif ch then error("unexpected character in object, comma expected"); end
			if not ch then error("eof while reading object"); end
			readmember(t);
		end
	end
	
	function readvalue()
		skipstuff();
		while ch do
			if ch == "{" then
				return readobject();
			elseif ch == "[" then
				return readarray();
			elseif ch == "\"" then
				return readstring();
			elseif ch:match("[%-0-9%.]") then
				return readnumber();
			elseif ch == "n" then
				return readliteral("null", null);
			elseif ch == "t" then
				return readliteral("true", true);
			elseif ch == "f" then
				return readliteral("false", false);
			end
		end
		error("eof while reading value");
	end
	next();
	return readvalue();
end

function _M.test(object)
	local encoded = encode(object);
	local decoded = decode(encoded);
	local recoded = encode(decoded);
	if encoded ~= recoded then
		print("FAILED");
		print("encoded:", encoded);
		print("recoded:", recoded);
	else
		print(encoded);
	end
	return encoded ~= recoded;
end

return _M;