#!/usr/bin/lua

local os = require "os"
local fs = require "nixio.fs"
local json = require "json"
local uci = require("uci")

local function is_in_dir(file, dir)
  if file == dir then
    return true
  else   
    return file:sub(1, #dir) == dir
  end  
end

local function rm(item)
  local ftype = fs.stat(item,"type")
  if ftype == "reg" then
    return fs.remove(item)
  elseif ftype == "dir" then
    local dir = fs.dir(item)
    for file in dir do
      if not rm(item..'/'..file) then
        return false
      end
    end
    return fs.rmdir(item)  
  end
end

local function chmod(item,mode,recursive)
  local result = fs.chmod(item,mode)
  if result and recursive then
    local dir = fs.dir(item)
    if dir then
      for file in dir do
        local ftype = fs.stat(item..'/'..file,"type")
        if ftype == "dir" then
          result = chmod(item..'/'..file,mode,recursive)
        elseif ftype == "reg" then
          result = chmod(item..'/'..file,string.gsub(mode,"x","-"),false)  
        end
        if not result then
          break
        end  
      end
    end
  end
  return result
end

print("Content-type: text/html; charset=utf-8")
print("Cache-control: no-cache")
print("Pragma: no-cache")

-- prepare the browser for content:
print("\r")

local result

local http_headers = nixio.getenv()
local request=io.read("*all")

local params=json.decode(request)
local action=params["action"]

local u_c = uci.cursor()
local basepath = u_c.get("filemanager","config","basedir")

local path
local items
local item
local newItemPath
local newPath
local singleFilename
local content
local mode
local destination
local compressedFilename
local recursive
local folderName

local files
local fstat
local ftype
local basename
local realitem
local command

if action == "list" then

  path = fs.realpath(basepath..'/'..params["path"])
  
  if path and is_in_dir(path,basepath) and fs.access(path,"r") then
    files = {}
    local rec
    for name in fs.dir(path) do
      basename=fs.realpath(path..'/'..name)
      if basename then
        fstat=fs.stat(fs.realpath(path..'/'..name))
        if fstat["type"]=="reg" then
          ftype="file"
        elseif fstat["type"]=="dir" then
          ftype="dir"
        else
          ftype=""
        end      
        if ftype then
          rec={name=name,rights=fstat["modestr"],size=fstat["size"],type=ftype,date=os.date('%Y-%m-%d %H:%M:%S',fstat["mtime"])}
          table.insert(files,rec)
        end
      end    
    end
    result = { result = files }
  else
    result = { result = {} }
  end

elseif action == "rename" then

  item = fs.realpath(basepath..'/'..params["item"])
  newItemPath = fs.realpath(basepath..'/'..fs.dirname(params["newItemPath"]))..'/'..fs.basename(params["newItemPath"])

  if is_in_dir(item,basepath) and is_in_dir(newItemPath,basepath) and item ~= basepath and newItemPath ~= basepath then
    result = { result = { success=fs.rename(item,newItemPath), error="" } }
  else
    result = { result = { success=false, error="Invalid path request" } }
  end

elseif action == "move" then

  items = params["items"]
  newPath = fs.realpath(basepath..'/'..params["newPath"])
  
  if is_in_dir(newPath,basepath) then

    result = true

    for key,item in pairs(items) do

      item = fs.realpath(basepath..'/'..item)
      basename = fs.basename(item)

      if is_in_dir(item,basepath) and item ~= basepath then
        result = fs.move(item,newPath.."/"..basename)
        if not result then 
          break
        end
      else
        result = false
        break
      end
      
    end  

    result = { result = { success=result, error="" } }

  else

    result = { result = { success=false, error="Invalid destination request" } }

  end  

elseif action == "copy" then

  items = params["items"]
  newPath = fs.realpath(basepath..'/'..params["newPath"])
  singleFilename = params["singleFilename"]
  if singleFilename then
    singleFilename = fs.basename(singleFilename)
  end

  if is_in_dir(newPath,basepath) then

    result = true

    for key,item in pairs(items) do

      item = fs.realpath(basepath..'/'..item)
      if singleFilename then
        basename = singleFilename
      else  
        basename = fs.basename(item)
      end

      if is_in_dir(item,basepath) and item ~= basepath then
        result = fs.copy(item,newPath.."/"..basename)
        if not result then 
          break
        end
      else
        result = false
        break
      end

    end  

    result = { result = { success=result, error="" } }

  else

    result = { result = { success=false, error="Invalid destination request" } }

  end  

elseif action == "remove" then

  items = params["items"]

  result = true

  for key,item in pairs(items) do

    item = fs.realpath(basepath..'/'..item)

    if is_in_dir(item,basepath) and item ~= basepath then
      result = rm(item)
      if not result then 
        break
      end
    else
      result = false
      break
    end

  end

  result = { result = { success=result, error="" } }

elseif action == "getContent" then

  item = fs.realpath(basepath..'/'..params["item"])
  
  if is_in_dir(item,basepath) and item ~= basepath then
    content = fs.readfile(item)
    result = { result = content }
  else
    result = { result = { success=false, error="Invalid path request" } }
  end

elseif action == "edit" then

  item = fs.realpath(basepath..'/'..params["item"])
  content = params["content"]
  
  if is_in_dir(item,basepath) and item ~= basepath then
    result = { result = { success=fs.writefile(item,content), error="" } }
  else
    result = { result = { success=false, error="Invalid path request" } }
  end

elseif action == "createFolder" then

  newPath = fs.realpath(basepath..'/'..fs.dirname(params["newPath"]))..'/'..fs.basename(params["newPath"])
  
  if is_in_dir(newPath,basepath) and newPath ~= basepath then
    result = { result = { success=fs.mkdir(newPath), error="" } }
  else
    result = { result = { success=false, error="Invalid path request" } }
  end

elseif action == "changePermissions" then

  items = params["items"]
  if params["perms"] then
    mode = params["perms"]
  else
    mode = params["permsCode"]
  end
  
  if mode then
    
    recursive = params["recursive"]

    result = true

    for key,item in pairs(items) do

      item = fs.realpath(basepath..'/'..item)

      if is_in_dir(item,basepath) and item ~= basepath then
        result = chmod(item,mode,recursive)
        if not result then 
          break
        end
      else
        result = false
        break
      end

    end

    result = { result = { success=result, error="" } }

  else
  
    result = { result = { success=false, error="No permission requested" } }
  
  end

elseif action == "compress" then

  items = params["items"]
  destination = params["destination"]
  compressedFilename = params["compressedFilename"]

  newPath = fs.realpath(basepath..'/'..destination)..'/'..fs.basename(params["compressedFilename"])

  result = true
  files = ""

  for key,item in pairs(items) do

    realitem = fs.realpath(basepath..'/'..item)

    if is_in_dir(realitem,basepath) and realitem ~= basepath then
      item = item:match("/(.*)")
      files = files.." "..item
    else
      result = false
      break
    end

  end
  
  if files then

    command = "cd "..basepath.."; zip -r "..newPath..files
    os.execute(command)
  
  end

  result = { result = { success=result, error="" } }

elseif action == "extract" then

  item = fs.realpath(basepath..'/'..params["item"])
  destination = params["destination"]
  folderName = params["folderName"]

  newPath = fs.realpath(basepath..'/'..destination)..'/'..fs.basename(params["folderName"])

  result = true
  files = ""

  if is_in_dir(item,basepath) and is_in_dir(newPath,basepath) and item ~= basepath then
    command = "unzip "..item.." -d "..newPath
    os.execute(command)
    result = { result = { success=true, error="" } }
  else
    result = { result = { success=false, error="Invalid path request" } }
  end


else

  result = { result = { success=false, error="Operation not impolemented yet" } }

end

print(json.encode(result))