diff options
Diffstat (limited to 'net/http/files.lua')
| -rw-r--r-- | net/http/files.lua | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/net/http/files.lua b/net/http/files.lua new file mode 100644 index 00000000..0b898dc6 --- /dev/null +++ b/net/http/files.lua @@ -0,0 +1,148 @@ +-- 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 = opts.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 = ('"%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 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 = 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; +} + |