plugins/mod_http_files.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9 module:depends("http");
  10 local lfs = require "lfs";
  11
  12 local os_date = os.date;
  13 local open = io.open;
  14 local stat = lfs.attributes;
  15
  16 local http_base = module:get_option_string("http_files_dir", module:get_option_string("http_path", "www_files"));
  17 local dir_indices = module:get_option("http_files_index", { "index.html", "index.htm" });
  18 local show_file_list = module:get_option_boolean("http_files_show_list");
  19
  20 local mime_map = module:shared("mime").types;
  21 if not mime_map then
  22         mime_map = {
  23                 html = "text/html", htm = "text/html",
  24                 xml = "application/xml",
  25                 txt = "text/plain",
  26                 css = "text/css",
  27                 js = "application/javascript",
  28                 png = "image/png",
  29                 gif = "image/gif",
  30                 jpeg = "image/jpeg", jpg = "image/jpeg",
  31                 svg = "image/svg+xml",
  32         };
  33         module:shared("mime").types = mime_map;
  34
  35         local mime_types, err = open(module:get_option_string("mime_types_file", "/etc/mime.types"),"r");
  36         if mime_types then
  37                 local mime_data = mime_types:read("*a");
  38                 mime_types:close();
  39                 setmetatable(mime_map, {
  40                         __index = function(t, ext)
  41                                 local typ = mime_data:match("\n(%S+)[^\n]*%s"..(ext:lower()).."%s") or "application/octet-stream";
  42                                 t[ext] = typ;
  43                                 return typ;
  44                         end
  45                 });
  46         end
  47 end
  48
  49 local cache = setmetatable({}, { __mode = "kv" }); -- Let the garbage collector have it if it wants to.
  50
  51 function serve_file(event, path)
  52         local request, response = event.request, event.response;
  53         local orig_path = request.path;
  54         local full_path = http_base.."/"..path;
  55         local attr = stat(full_path);
  56         if not attr then
  57                 return 404;
  58         end
  59
  60         local last_modified = os_date('!%a, %d %b %Y %H:%M:%S GMT', attr.modification);
  61         response.headers.last_modified = last_modified;
  62
  63         local etag = ("%02x-%x-%x-%x"):format(attr.dev or 0, attr.ino or 0, attr.size or 0, attr.modification or 0);
  64         response.headers.etag = etag;
  65
  66         if etag == request.headers.if_none_match
  67         or last_modified == request.headers.if_modified_since then
  68                 return 304;
  69         end
  70
  71         local data = cache[path];
  72         if data then
  73                 response.headers.content_type = data.content_type;
  74                 data = data.data;
  75         elseif attr.mode == "directory" then
  76                 if full_path:sub(-1) ~= "/" then
  77                         response.headers.location = orig_path.."/";
  78                         return 301;
  79                 end
  80                 for i=1,#dir_indices do
  81                         if stat(full_path..dir_indices[i], "mode") == "file" then
  82                                 return serve_file(event, path..dir_indices[i]);
  83                         end
  84                 end
  85
  86                 if not show_file_list then
  87                         return 403;
  88                 else
  89                         local html = require"util.stanza".stanza("html")
  90                                 :tag("head"):tag("title"):text(path):up()
  91                                         :tag("meta", { charset="utf-8" }):up()
  92                                 :up()
  93                                 :tag("body"):tag("h1"):text(path):up()
  94                                         :tag("ul");
  95                         for file in lfs.dir(full_path) do
  96                                 if file:sub(1,1) ~= "." then
  97                                         local attr = stat(full_path..file) or {};
  98                                         html:tag("li", { class = attr.mode })
  99                                                 :tag("a", { href = file }):text(file)
 100                                         :up():up();
 101                                 end
 102                         end
 103                         data = "<!DOCTYPE html>\n"..tostring(html);
 104                         cache[path] = { data = data, content_type = mime_map.html; hits = 0 };
 105                         response.headers.content_type = mime_map.html;
 106                 end
 107
 108         else
 109                 local f = open(full_path, "rb");
 110                 data = f and f:read("*a");
 111                 f:close();
 112                 if not data then
 113                         return 403;
 114                 end
 115                 local ext = path:match("%.([^.]*)$");
 116                 local content_type = mime_map[ext];
 117                 cache[path] = { data = data; content_type = content_type; };
 118                 response.headers.content_type = content_type;
 119         end
 120
 121         return response:send(data);
 122 end
 123
 124 module:provides("http", {
 125         route = {
 126                 ["GET /*"] = serve_file;
 127         };
 128 });
 129