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 server = require"net.http.server";
  11 local lfs = require "lfs";
  12
  13 local os_date = os.date;
  14 local open = io.open;
  15 local stat = lfs.attributes;
  16 local build_path = require"socket.url".build_path;
  17
  18 local base_path = module:get_option_string("http_files_dir", module:get_option_string("http_path"));
  19 local dir_indices = module:get_option("http_index_files", { "index.html", "index.htm" });
  20 local directory_index = module:get_option_boolean("http_dir_listing");
  21
  22 local mime_map = module:shared("mime").types;
  23 if not mime_map then
  24         mime_map = {
  25                 html = "text/html", htm = "text/html",
  26                 xml = "application/xml",
  27                 txt = "text/plain",
  28                 css = "text/css",
  29                 js = "application/javascript",
  30                 png = "image/png",
  31                 gif = "image/gif",
  32                 jpeg = "image/jpeg", jpg = "image/jpeg",
  33                 svg = "image/svg+xml",
  34         };
  35         module:shared("mime").types = mime_map;
  36
  37         local mime_types, err = open(module:get_option_string("mime_types_file", "/etc/mime.types"),"r");
  38         if mime_types then
  39                 local mime_data = mime_types:read("*a");
  40                 mime_types:close();
  41                 setmetatable(mime_map, {
  42                         __index = function(t, ext)
  43                                 local typ = mime_data:match("\n(%S+)[^\n]*%s"..(ext:lower()).."%s") or "application/octet-stream";
  44                                 t[ext] = typ;
  45                                 return typ;
  46                         end
  47                 });
  48         end
  49 end
  50
  51 local cache = setmetatable({}, { __mode = "kv" }); -- Let the garbage collector have it if it wants to.
  52
  53 function serve(opts)
  54         local base_path = opts.path;
  55         local dir_indices = opts.index_files or dir_indices;
  56         local directory_index = opts.directory_index;
  57         local function serve_file(event, path)
  58                 local request, response = event.request, event.response;
  59                 local orig_path = request.path;
  60                 local full_path = base_path .. (path and "/"..path or "");
  61                 local attr = stat(full_path);
  62                 if not attr then
  63                         return 404;
  64                 end
  65
  66                 local request_headers, response_headers = request.headers, response.headers;
  67
  68                 local last_modified = os_date('!%a, %d %b %Y %H:%M:%S GMT', attr.modification);
  69                 response_headers.last_modified = last_modified;
  70
  71                 local etag = ("%02x-%x-%x-%x"):format(attr.dev or 0, attr.ino or 0, attr.size or 0, attr.modification or 0);
  72                 response_headers.etag = etag;
  73
  74                 local if_none_match = request_headers.if_none_match
  75                 local if_modified_since = request_headers.if_modified_since;
  76                 if etag == if_none_match
  77                 or (not if_none_match and last_modified == if_modified_since) then
  78                         return 304;
  79                 end
  80
  81                 local data = cache[orig_path];
  82                 if data and data.etag == etag then
  83                         response_headers.content_type = data.content_type;
  84                         data = data.data;
  85                 elseif attr.mode == "directory" and path then
  86                         if full_path:sub(-1) ~= "/" then
  87                                 local path = { is_absolute = true, is_directory = true };
  88                                 for dir in orig_path:gmatch("[^/]+") do path[#path+1]=dir; end
  89                                 response_headers.location = build_path(path);
  90                                 return 301;
  91                         end
  92                         for i=1,#dir_indices do
  93                                 if stat(full_path..dir_indices[i], "mode") == "file" then
  94                                         return serve_file(event, path..dir_indices[i]);
  95                                 end
  96                         end
  97
  98                         if directory_index then
  99                                 data = server._events.fire_event("directory-index", { path = request.path, full_path = full_path });
 100                         end
 101                         if not data then
 102                                 return 403;
 103                         end
 104                         cache[orig_path] = { data = data, content_type = mime_map.html; etag = etag; };
 105                         response_headers.content_type = mime_map.html;
 106
 107                 else
 108                         local f, err = open(full_path, "rb");
 109                         if f then
 110                                 data, err = f:read("*a");
 111                                 f:close();
 112                         end
 113                         if not data then
 114                                 module:log("debug", "Could not open or read %s. Error was %s", full_path, err);
 115                                 return 403;
 116                         end
 117                         local ext = orig_path:match("%.([^./]+)$");
 118                         local content_type = ext and mime_map[ext];
 119                         cache[orig_path] = { data = data; content_type = content_type; etag = etag };
 120                         response_headers.content_type = content_type;
 121                 end
 122
 123                 return response:send(data);
 124         end
 125
 126         return serve_file;
 127 end
 128
 129
 130 if base_path then
 131         module:provides("http", {
 132                 route = {
 133                         ["GET /*"] = serve {
 134                                 path = base_path;
 135                                 directory_index = directory_index;
 136                         }
 137                 };
 138         });
 139 else
 140         module:log("debug", "http_files_dir not set, assuming use by some other module");
 141 end
 142