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-rw-r--r--net/http/files.lua148
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;
+}
+