1 # Copyright (C) 2016-2020 all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
4 # This package can either be a PSGI response body for a static file
5 # OR a standalone PSGI app which returns the above PSGI response body
6 # (or an HTML directory listing).
8 # It encapsulates the "autoindex", "index", and "gzip_static"
9 # functionality of nginx.
10 package PublicInbox::WwwStatic;
12 use parent qw(Exporter);
14 use Fcntl qw(SEEK_SET O_RDONLY O_NONBLOCK);
15 use POSIX qw(strftime);
16 use HTTP::Date qw(time2str);
17 use HTTP::Status qw(status_message);
18 use Errno qw(EACCES ENOTDIR ENOENT);
19 use URI::Escape qw(uri_escape_utf8);
20 use PublicInbox::Hval qw(ascii_html);
22 our @EXPORT_OK = qw(@NO_CACHE r path_info_raw);
24 our @NO_CACHE = ('Expires', 'Fri, 01 Jan 1980 00:00:00 GMT',
26 'Cache-Control', 'no-cache, max-age=0, must-revalidate');
31 *{background:#000;color:#ccc}
32 a{color:#69f;text-decoration:none}
35 @media screen AND (prefers-color-scheme:light) {
36 *{background:#fff;color:#333}
37 a{color:#00f;text-decoration:none}
47 my ($code, $msg) = @_;
48 $msg ||= status_message($code);
49 [ $code, [ qw(Content-Type text/plain), 'Content-Length', length($msg),
54 sub getline_response ($$$$$) {
55 my ($env, $in, $off, $len, $path) = @_;
56 my $r = bless {}, __PACKAGE__;
57 if ($env->{'pi-httpd.async'}) { # public-inbox-httpd-only mode
58 $env->{'psgix.no-compress'} = 1; # do not chunk response
59 %$r = ( bypass => [$in, $off, $len, $env->{'psgix.io'}] );
61 %$r = ( in => $in, off => $off, len => $len, path => $path );
67 my ($env, $in, $h, $beg, $end, $size) = @_;
71 if ($end ne '') { # "bytes=-$end" => last N bytes
82 } elsif ($end eq '' || $end >= $size) {
85 } elsif ($end < $size) {
92 $len = $end - $beg + 1;
96 push @$h, qw(Accept-Ranges bytes Content-Range);
97 push @$h, "bytes $beg-$end/$size";
99 # FIXME: Plack::Middleware::Deflater bug?
100 $env->{'psgix.no-compress'} = 1;
104 push @$h, 'Content-Range', "bytes */$size";
105 return [ 416, $h, [] ];
110 # returns a PSGI arrayref response iff .gz and non-.gz mtimes match
111 sub try_gzip_static ($$$$) {
112 my ($env, $h, $path, $type) = @_;
113 return unless ($env->{HTTP_ACCEPT_ENCODING} // '') =~ /\bgzip\b/i;
115 return unless -f $path && defined(($mtime = (stat(_))[9]));
117 return unless -f $gz && (stat(_))[9] == $mtime;
118 my $res = response($env, $h, $gz, $type);
119 return if ($res->[0] > 300 || $res->[0] < 200);
120 push @{$res->[1]}, qw(Cache-Control no-transform
121 Content-Encoding gzip
122 Vary Accept-Encoding);
126 sub response ($$$;$) {
127 my ($env, $h, $path, $type) = @_;
128 $type //= Plack::MIME->mime_type($path) // 'application/octet-stream';
129 if ($path !~ /\.gz\z/i) {
130 if (my $res = try_gzip_static($env, $h, $path, $type)) {
136 if ($env->{REQUEST_METHOD} eq 'HEAD') {
137 return r(404) unless -f $path && -r _; # in case it's a FIFO :P
138 } else { # GET, callers should've already filtered out other methods
139 if (!sysopen($in, $path, O_RDONLY|O_NONBLOCK)) {
140 return r(404) if $! == ENOENT || $! == ENOTDIR;
141 return r(403) if $! == EACCES;
144 return r(404) unless -f $in;
146 my $size = -s _; # bare "_" reuses "struct stat" from "-f" above
147 my $mtime = time2str((stat(_))[9]);
149 if (my $ims = $env->{HTTP_IF_MODIFIED_SINCE}) {
150 return [ 304, [], [] ] if $mtime eq $ims;
155 push @$h, 'Content-Type', $type;
157 if (($env->{HTTP_RANGE} || '') =~ /\bbytes=([0-9]*)-([0-9]*)\z/) {
158 ($code, $off, $len) = setup_range($env, $in, $h, $1, $2, $size);
159 return $code if ref($code);
161 push @$h, 'Content-Length', $len, 'Last-Modified', $mtime;
162 [ $code, $h, $in ? getline_response($env, $in, $off, $len, $path) : [] ]
165 # called by PSGI servers on each response chunk:
169 # avoid buffering, by becoming the buffer! (public-inbox-httpd)
170 if (my $tmpio = delete $self->{bypass}) {
171 my $http = pop @$tmpio; # PublicInbox::HTTP
172 push @{$http->{wbuf}}, $tmpio; # [ $in, $off, $len ]
177 # generic PSGI runs this:
178 my $len = $self->{len} or return; # undef, tells server we're done
180 $n = $len if $len < $n;
181 sysseek($self->{in}, $self->{off}, SEEK_SET) or
182 die "sysseek ($self->{path}): $!";
183 my $r = sysread($self->{in}, my $buf, $n);
184 if (defined $r && $r > 0) { # success!
185 $self->{len} = $len - $r;
189 my $m = defined $r ? "EOF with $len bytes left" : "read error: $!";
190 die "$self->{path} $m, dropping client socket\n";
193 sub close {} # noop, called by PSGI server, just let everything go out-of-scope
195 # OO interface for use as a Plack app
197 my ($class, %opt) = @_;
198 my $index = $opt{'index'} // [ 'index.html' ];
199 $index = [ $index ] if defined($index) && ref($index) ne 'ARRAY';
200 $index = undef if scalar(@$index) == 0;
201 my $style = $opt{style};
202 if (defined $style) {
203 $style = \$style unless ref($style);
205 my $docroot = $opt{docroot};
206 die "`docroot' not set" unless defined($docroot) && $docroot ne '';
210 autoindex => $opt{autoindex},
211 style => $style // \$STYLE,
215 # PATH_INFO is decoded, and we want the undecoded original
217 sub path_info_raw ($) {
219 my $sn = $env->{SCRIPT_NAME};
220 my $re = $path_re_cache{$sn} ||= do {
221 $sn = '/'.$sn unless index($sn, '/') == 0;
223 qr!\A(?:https?://[^/]+)?\Q$sn\E(/[^\?\#]+)!;
225 $env->{REQUEST_URI} =~ $re ? $1 : $env->{PATH_INFO};
228 sub redirect_slash ($) {
230 my $url = $env->{'psgi.url_scheme'} . '://';
231 my $host_port = $env->{HTTP_HOST} //
232 "$env->{SERVER_NAME}:$env->{SERVER_PORT}";
233 $url .= $host_port . path_info_raw($env) . '/';
234 my $body = "Redirecting to $url\n";
235 [ 302, [ qw(Content-Type text/plain), 'Location', $url,
236 'Content-Length', length($body) ], [ $body ] ]
242 for my $s (qw(K M G T P)) {
243 last if $size < 1024;
250 sprintf('%lu', $size).$suffix;
253 # by default, this returns "index.html" if it exists for a given directory
254 # It'll generate a directory listing, (autoindex).
255 # May be disabled by setting autoindex => 0
256 sub dir_response ($$$) {
257 my ($self, $env, $fs_path) = @_;
258 if (my $index = $self->{'index'}) { # serve index.html or similar
259 for my $html (@$index) {
260 my $p = $fs_path . $html;
261 my $res = response($env, [], $p);
262 return $res if $res->[0] != 404;
265 return r(404) unless $self->{autoindex};
266 opendir(my $dh, $fs_path) or do {
267 return r(404) if ($! == ENOENT || $! == ENOTDIR);
268 return r(403) if $! == EACCES;
271 my @entries = grep(!/\A\./, readdir($dh));
273 my (%dirs, %other, %want_gz);
274 my $path_info = $env->{PATH_INFO};
275 push @entries, '..' if $path_info ne '/';
276 for my $base (@entries) {
277 my $href = ascii_html(uri_escape_utf8($base));
278 my $name = ascii_html($base);
279 my @st = stat($fs_path . $base) or next; # unlikely
280 my ($gzipped, $uncompressed, $hsize);
287 $dirs{"$base\0$mtime"} = \$entry;
289 $other{"$base\0$mtime"} = \$entry;
290 if ($base !~ /\.gz\z/i) {
291 $want_gz{"$base.gz\0$mtime"} = undef;
293 $hsize = human_size($st[7]);
297 # 54 = 80 - (SP length(strftime(%Y-%m-%d %k:%M)) SP human_size)
298 $hsize = sprintf('% 8s', $hsize);
299 my $pad = 54 - length($name);
300 $pad = 1 if $pad <= 0;
301 $entry .= qq(<a\nhref="$href">$name</a>) . (' ' x $pad);
302 $mtime = strftime('%Y-%m-%d %k:%M', gmtime($mtime));
303 $entry .= $mtime . $hsize;
306 # filter out '.gz' files as long as the mtime matches the
307 # uncompressed version
308 delete(@other{keys %want_gz});
309 @entries = ((map { ${$dirs{$_}} } sort keys %dirs),
310 (map { ${$other{$_}} } sort keys %other));
312 my $path_info_html = ascii_html($path_info);
313 my $body = "<html><head><title>Index of $path_info_html</title>" .
315 "</head><body><pre>Index of $path_info_html</pre><hr><pre>\n";
316 $body .= join("\n", @entries) . "</pre><hr></body></html>\n";
317 [ 200, [ qw(Content-Type text/html
318 Content-Length), bytes::length($body) ], [ $body ] ]
321 sub call { # PSGI app endpoint
322 my ($self, $env) = @_;
323 return r(405) if $env->{REQUEST_METHOD} !~ /\A(?:GET|HEAD)\z/;
324 my $path_info = $env->{PATH_INFO};
325 return r(403) if index($path_info, "\0") >= 0;
326 my (@parts) = split(m!/+!, $path_info, -1);
327 return r(403) if grep(/\A(?:\.\.)\z/, @parts) || $parts[0] ne '';
329 my $fs_path = join('/', $self->{docroot}, @parts);
330 return dir_response($self, $env, $fs_path) if $parts[-1] eq '';
332 my $res = response($env, [], $fs_path);
333 $res->[0] == 404 && -d $fs_path ? redirect_slash($env) : $res;