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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.
--
local server = require"net.http.server";
local lfs = require "lfs";
local new_cache = require "util.cache".new;
local log = require "util.logger".init("net.http.files");
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 forbidden_chars_pattern = "[/%z]";
if package.config:sub(1,1) == "\\" then
forbidden_chars_pattern = "[/%z\001-\031\127\"*:<>?|]"
end
local urldecode = require "util.http".urldecode;
local function sanitize_path(path) --> util.paths or util.http?
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 function serve(opts)
if type(opts) ~= "table" then -- assume path string
opts = { path = opts };
end
local mime_map = opts.mime_map or { html = "text/html" };
local cache = new_cache(opts.cache_size or 256);
local cache_max_file_size = tonumber(opts.cache_max_file_size) or 1024
-- luacheck: ignore 431
local base_path = assert(opts.path, "invalid argument to net.http.files.path(), missing required 'path'");
local dir_indices = opts.index_files or { "index.html", "index.htm" };
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 = ('"%x-%x-%x"'):format(attr.change 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;
cache:set(orig_path, data);
elseif attr.mode == "directory" and path then
if full_path:sub(-1) ~= "/" then
local dir_path = { is_absolute = true, is_directory = true };
for dir in orig_path:gmatch("[^/]+") do dir_path[#dir_path+1]=dir; end
response_headers.location = build_path(dir_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:set(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
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 = ("%d"):format(attr.size);
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
return {
serve = serve;
}
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