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pubnub.lua
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pubnub.lua
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require "Json"
require "crypto"
pubnub = {}
local LIMIT = 1700
function pubnub.new(init)
local self = init
local subscriptions = {}
-- SSL ENABLED?
if self.ssl then
self.origin = "https://" .. self.origin
else
self.origin = "http://" .. self.origin
end
function self:publish(args)
local callback = args.callback or function() end
if not (args.channel and args.message) then
return callback({ nil, "Missing Channel and/or Message" })
end
local channel = args.channel
local message = Json.Encode(args.message)
local signature = "0"
-- SIGN PUBLISHED MESSAGE?
if self.secret_key then
signature = crypto.digest( crypto.md5, table.concat( {
self.publish_key,
self.subscribe_key,
self.secret_key,
channel,
message
}, "/" ) )
end
-- MESSAGE TOO LONG?
if string.len(message) > LIMIT then
return callback({ nil, "Message Too Long (" .. LIMIT .. ")" })
end
-- PUBLISH MESSAGE
self:_request({
callback = function(response)
if not response then
return callback({ nil, "Connection Lost" })
end
callback(response)
end,
request = {
"publish",
self.publish_key,
self.subscribe_key,
signature,
self:_encode(channel),
"0",
self:_encode(message)
}
})
end
function self:subscribe(args)
local channel = args.channel
local callback = callback or args.callback
local errorback = args['errorback'] or function() end
local connectcb = args['connect'] or function() end
local timetoken = 0
if not channel then return print("Missing Channel") end
if not callback then return print("Missing Callback") end
-- NEW CHANNEL?
if not subscriptions[channel] then
subscriptions[channel] = {}
end
-- ENSURE SINGLE CONNECTION
if (subscriptions[channel].connected) then
return print("Already Connected")
end
subscriptions[channel].connected = 1
subscriptions[channel].first = nil
-- SUBSCRIPTION RECURSION
local function substabizel()
-- STOP CONNECTION?
if not subscriptions[channel].connected then return end
-- CONNECT TO PUBNUB SUBSCRIBE SERVERS
self:_request({
callback = function(response)
-- STOP CONNECTION?
if not subscriptions[channel].connected then return end
-- CONNECTED CALLBACK
if not subscriptions[channel].first then
subscriptions[channel].first = true
connectcb()
end
-- PROBLEM?
if not response then
-- ENSURE CONNECTED
return self:time({
callback = function(time)
if not time then
timer.performWithDelay( 1000, substabizel )
return errorback("Lost Network Connection")
end
timer.performWithDelay( 10, substabizel )
end
})
end
timetoken = response[2]
timer.performWithDelay( 1, substabizel )
for i, message in ipairs(response[1]) do
callback(message)
end
end,
request = {
"subscribe",
self.subscribe_key,
self:_encode(channel),
"0",
timetoken
}
})
end
-- BEGIN SUBSCRIPTION (LISTEN FOR MESSAGES)
substabizel()
end
function self:unsubscribe(args)
local channel = args.channel
if not subscriptions[channel] then return nil end
-- DISCONNECT
subscriptions[channel].connected = nil
subscriptions[channel].first = nil
end
function self:history(args)
if not (args.callback and args.channel) then
return print("Missing History Callback and/or Channel")
end
local limit = args.limit
local channel = args.channel
local callback = args.callback
if not limit then limit = 10 end
self:_request({
callback = callback,
request = {
'history',
self.subscribe_key,
self:_encode(channel),
'0',
limit
}
})
end
function self:time(args)
if not args.callback then
return print("Missing Time Callback")
end
self:_request({
request = { "time", "0" },
callback = function(response)
if response then
return args.callback(response[1])
end
args.callback(nil)
end
})
end
function self:_request(args)
-- APPEND PUBNUB CLOUD ORIGIN
table.insert( args.request, 1, self.origin )
local url = table.concat( args.request, "/" )
network.request( url, "GET", function(event)
if (event.isError) then
return args.callback(nil)
end
status, message = pcall( Json.Decode, event.response )
if status then
return args.callback(message)
else
return args.callback(nil)
end
end )
end
function self:_encode(str)
str = string.gsub( str, "([^%w])", function(c)
return string.format( "%%%02X", string.byte(c) )
end )
return str
end
function self:_map( func, array )
local new_array = {}
for i,v in ipairs(array) do
new_array[i] = func(v)
end
return new_array
end
-- RETURN NEW PUBNUB OBJECT
return self
end