1 /*
2 Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License, version 2.0,
6 as published by the Free Software Foundation.
7
8 This program is also distributed with certain software (including
9 but not limited to OpenSSL) that is licensed under separate terms,
10 as designated in a particular file or component or in included license
11 documentation. The authors of MySQL hereby grant you an additional
12 permission to link the program and your derivative works with the
13 separately licensed software that they have included with MySQL.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 #include "static_files.h"
26
27 #include <memory>
28 #include <string>
29
30 #ifdef _WIN32
31 #include <io.h> // close
32 #else
33 #include <unistd.h> // close
34 #endif
35 #include <fcntl.h>
36 #include <sys/stat.h>
37 #include <sys/types.h>
38
39 #include <event2/http.h> // evhttp_uridecode
40
41 #include "mysql/harness/stdx/io/file_handle.h"
42 #include "mysqlrouter/http_auth_realm_component.h"
43 #include "mysqlrouter/http_server_component.h"
44
45 #include "content_type.h"
46
handle_request(HttpRequest & req)47 void HttpStaticFolderHandler::handle_request(HttpRequest &req) {
48 HttpUri parsed_uri{req.get_uri()};
49
50 // failed to parse the URI
51 if (!parsed_uri) {
52 req.send_error(HttpStatusCode::BadRequest);
53 return;
54 }
55
56 if (req.get_method() != HttpMethod::Get &&
57 req.get_method() != HttpMethod::Head) {
58 req.send_error(HttpStatusCode::MethodNotAllowed);
59
60 return;
61 }
62
63 if (!require_realm_.empty()) {
64 if (auto realm =
65 HttpAuthRealmComponent::get_instance().get(require_realm_)) {
66 if (HttpAuth::require_auth(req, realm)) {
67 // request is already handled, nothing to do
68 return;
69 }
70
71 // access granted, fall through
72 }
73 }
74
75 // guess mime-type
76
77 std::string file_path{static_basedir_};
78
79 file_path += "/";
80 std::unique_ptr<char, decltype(&free)> unescaped{
81 evhttp_uridecode(parsed_uri.get_path().c_str(), 1, nullptr), &free};
82 file_path += http_uri_path_canonicalize(unescaped.get());
83
84 auto out_hdrs = req.get_output_headers();
85
86 struct stat st;
87 if (-1 == stat(file_path.c_str(), &st)) {
88 if (errno == ENOENT) {
89 // file doesn't exist
90 req.send_error(HttpStatusCode::NotFound);
91
92 return;
93 } else {
94 req.send_error(HttpStatusCode::InternalError);
95
96 return;
97 }
98 }
99
100 // if we have a directory, check if it contains a index.html file
101 if ((st.st_mode & S_IFMT) == S_IFDIR) {
102 file_path += "/index.html";
103
104 if (-1 == stat(file_path.c_str(), &st)) {
105 if (errno == ENOENT) {
106 // it was a directory, but there is no index-file
107 req.send_error(HttpStatusCode::Forbidden);
108
109 return;
110 } else {
111 req.send_error(HttpStatusCode::InternalError);
112
113 return;
114 }
115 }
116 }
117
118 auto res = stdx::io::file_handle::file({}, file_path);
119 if (!res) {
120 if (res.error() ==
121 make_error_condition(std::errc::no_such_file_or_directory)) {
122 // stat() succeeded, but open() failed.
123 //
124 // either a race or apparmor
125 req.send_error(HttpStatusCode::NotFound);
126
127 return;
128 } else {
129 // if it was a directory
130 req.send_error(HttpStatusCode::InternalError);
131
132 return;
133 }
134 } else {
135 auto fh = std::move(res.value());
136 if (!req.is_modified_since(st.st_mtime)) {
137 req.send_error(HttpStatusCode::NotModified);
138 return;
139 }
140
141 req.add_last_modified(st.st_mtime);
142
143 auto chunk = req.get_output_buffer();
144 // if the file-size is 0, there is nothing to send ... and it triggers a
145 // mmap() error
146 if (st.st_size > 0) {
147 // only use sendfile if packet is large enough as it will be sent in sep
148 // TCP packet/syscall
149 //
150 // using TCP_CORK would help here
151 // if (st.st_size > 64 * 1024) {
152 // evbuffer_set_flags(chunk, EVBUFFER_FLAG_DRAINS_TO_FD);
153 // }
154 chunk.add_file(fh.release(), 0, st.st_size);
155 // file_fd is owned by evbuffer_add_file(), don't close it
156 } else {
157 fh.close();
158 }
159
160 // file exists
161 auto n = file_path.rfind('.');
162 if (n != std::string::npos) {
163 out_hdrs.add("Content-Type",
164 ContentType::from_extension(file_path.substr(n + 1)));
165 }
166
167 req.send_reply(HttpStatusCode::Ok,
168 HttpStatusCode::get_default_status_text(HttpStatusCode::Ok),
169 chunk);
170
171 return;
172 }
173 }
174