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|
-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
module:depends("http");
local server = require"net.http.server";
local lfs = require "lfs";
local os_date = os.date;
local open = io.open;
local stat = lfs.attributes;
local build_path = require"socket.url".build_path;
local path_sep = package.config:sub(1,1);
local base_path = module:get_option_string("http_files_dir", module:get_option_string("http_path"));
local cache_size = module:get_option_number("http_files_cache_size", 128);
local cache_max_file_size = module:get_option_number("http_files_cache_max_file_size", 4096);
local dir_indices = module:get_option("http_index_files", { "index.html", "index.htm" });
local directory_index = module:get_option_boolean("http_dir_listing");
local mime_map = module:shared("/*/http_files/mime").types;
if not mime_map then
mime_map = {
html = "text/html", htm = "text/html",
xml = "application/xml",
txt = "text/plain",
css = "text/css",
js = "application/javascript",
png = "image/png",
gif = "image/gif",
jpeg = "image/jpeg", jpg = "image/jpeg",
svg = "image/svg+xml",
};
module:shared("/*/http_files/mime").types = mime_map;
local mime_types, err = open(module:get_option_string("mime_types_file", "/etc/mime.types"),"r");
if mime_types then
local mime_data = mime_types:read("*a");
mime_types:close();
setmetatable(mime_map, {
__index = function(t, ext)
local typ = mime_data:match("\n(%S+)[^\n]*%s"..(ext:lower()).."%s") or "application/octet-stream";
t[ext] = typ;
return typ;
end
});
end
end
local forbidden_chars_pattern = "[/%z]";
if prosody.platform == "windows" then
forbidden_chars_pattern = "[/%z\001-\031\127\"*:<>?|]"
end
local urldecode = require "util.http".urldecode;
function sanitize_path(path)
if not path then return end
local out = {};
local c = 0;
for component in path:gmatch("([^/]+)") do
component = urldecode(component);
if component:find(forbidden_chars_pattern) then
return nil;
elseif component == ".." then
if c <= 0 then
return nil;
end
out[c] = nil;
c = c - 1;
elseif component ~= "." then
c = c + 1;
out[c] = component;
end
end
if path:sub(-1,-1) == "/" then
out[c+1] = "";
end
return "/"..table.concat(out, "/");
end
local cache = require "util.cache".new(cache_size);
function serve(opts)
if type(opts) ~= "table" then -- assume path string
opts = { path = opts };
end
local base_path = opts.path;
local dir_indices = opts.index_files or dir_indices;
local directory_index = opts.directory_index;
local function serve_file(event, path)
local request, response = event.request, event.response;
local sanitized_path = sanitize_path(path);
if path and not sanitized_path then
return 400;
end
path = sanitized_path;
local orig_path = sanitize_path(request.path);
local full_path = base_path .. (path or ""):gsub("/", path_sep);
local attr = stat(full_path:match("^.*[^\\/]")); -- Strip trailing path separator because Windows
if not attr then
return 404;
end
local request_headers, response_headers = request.headers, response.headers;
local last_modified = os_date('!%a, %d %b %Y %H:%M:%S GMT', attr.modification);
response_headers.last_modified = last_modified;
local etag = ('"%02x-%x-%x-%x"'):format(attr.dev or 0, attr.ino or 0, attr.size or 0, attr.modification or 0);
response_headers.etag = etag;
local if_none_match = request_headers.if_none_match
local if_modified_since = request_headers.if_modified_since;
if etag == if_none_match
or (not if_none_match and last_modified == if_modified_since) then
return 304;
end
local data = cache:get(orig_path);
if data and data.etag == etag then
response_headers.content_type = data.content_type;
data = data.data;
elseif attr.mode == "directory" and path then
if full_path:sub(-1) ~= "/" then
local path = { is_absolute = true, is_directory = true };
for dir in orig_path:gmatch("[^/]+") do path[#path+1]=dir; end
response_headers.location = build_path(path);
return 301;
end
for i=1,#dir_indices do
if stat(full_path..dir_indices[i], "mode") == "file" then
return serve_file(event, path..dir_indices[i]);
end
end
if directory_index then
data = server._events.fire_event("directory-index", { path = request.path, full_path = full_path });
end
if not data then
return 403;
end
cache[orig_path] = { data = data, content_type = mime_map.html; etag = etag; };
response_headers.content_type = mime_map.html;
else
local f, err = open(full_path, "rb");
if not f then
module:log("debug", "Could not open %s. Error was %s", full_path, err);
return 403;
end
local ext = full_path:match("%.([^./]+)$");
local content_type = ext and mime_map[ext];
response_headers.content_type = content_type;
if attr.size > cache_max_file_size then
response_headers.content_length = attr.size;
module:log("debug", "%d > cache_max_file_size", attr.size);
return response:send_file(f);
else
data = f:read("*a");
f:close();
end
cache:set(orig_path, { data = data; content_type = content_type; etag = etag });
end
return response:send(data);
end
return serve_file;
end
function wrap_route(routes)
for route,handler in pairs(routes) do
if type(handler) ~= "function" then
routes[route] = serve(handler);
end
end
return routes;
end
if base_path then
module:provides("http", {
route = {
["GET /*"] = serve {
path = base_path;
directory_index = directory_index;
}
};
});
else
module:log("debug", "http_files_dir not set, assuming use by some other module");
end
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