feat: add blips.json file

Blips that are generated are now saved to a file, this file is then exposed to the web and can be gotten by HTTP requets.

closes #5

server/blips_server.lua

@@ -0,0 +1,107 @@
+--[[
+            LiveMap - A LiveMap for FiveM servers
+              Copyright (C) 2017  Jordan Dalton
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program in the file "LICENSE".  If not, see <http://www.gnu.org/licenses/>.
+]]
+
+--[[
+    Blips!!!
+    This file should expose the "blips.json" file to that sexy new http handler
+]]
+
+RegisterServerEvent("livemap:blipsGenerated")
+
+local cache = {}
+
+-- Set this to the player who did the "blips generate" command. Should stop
+-- randomers triggering the event :)
+local playerWhoGeneratedBlips = nil
+
+function cacheIsEmpty()
+    for _, _ in pairs(cache) do
+        return false
+    end
+    return true
+end
+
+function sendBlips(res)
+    if not cacheIsEmpty() then
+        res.send(json.encode(cache))
+        return
+    else
+        -- Send cached blips
+        local blipFile = GetConvar("blip_file", "server/blips.json")
+        local blipData = LoadResourceFile(GetCurrentResourceName(), blipFile)
+
+        if not blipData then
+            print("LIVE MAP ERROR: No blip file... Have you generated them yet?")
+            res.send(json.encode({ error = "no blips found" }) )
+            return
+        end
+
+        cache = json.decode(blipData)
+        res.send(blipData)
+    end
+end
+
+function saveBlips(blipTable)
+    local blipFile = GetConvar("blip_file", "server/blips.json")
+    local saved = SaveResourceFile(GetCurrentResourceName(), blipFile, json.encode(blipTable, {indent = true}), -1)
+
+    if not saved then
+        print("LiveMap couldn't save the blips to file.. Maybe the directory isn't writable?")
+    end
+
+end
+
+AddEventHandler("livemap:blipsGenerated", function(blipTable)
+    local id = GetPlayerIdentifier(source, 0)
+
+    if playerWhoGeneratedBlips == nil or playerWhoGeneratedBlips ~= id then
+        print("playerWhoGeneratedBlips was incorrect.. Maybe \"" .. id .. "\" triggered the event themselves?\nEither way, I'm not doing it..")
+        return
+    end
+
+    saveBlips(blipTable)
+    cache = blipTable
+end)
+
+RegisterCommand("blips", function(source, args, rawCommand)
+    local playerId = GetPlayerIdentifier(source, 0)
+    if args[1] == "generate" then
+        print("Generating blips using the in-game native: Player " .. playerId .. " is generating (I hope you know them)")
+        playerWhoGeneratedBlips = playerId
+
+        TriggerClientEvent("livemap:getBlipsFromClient", source)
+
+        return
+    end
+
+end, true)
+
+--[[
+    Handle HTTP requests. Mainly used for getting the blips via ajax from the UI
+]]
+SetHttpHandler(function(req, res)
+	local path = req.path
+
+    if path == "/blips" or path == "/blips.json" then
+        return sendBlips(res)
+    end
+
+    return res.send(json.encode({
+        error = "path \"" .. path .."\" not found"
+    }))
+end)