/usr/share/ada/adainclude/aws/aws-services-download.adb is in libaws3.3.2.2-dev 17.2.2017-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 | ------------------------------------------------------------------------------
-- Ada Web Server --
-- --
-- Copyright (C) 2005-2014, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify --
-- it under terms of the GNU General Public License as published by the --
-- Free Software Foundation; either version 3, or (at your option) any --
-- later version. This library is distributed in the hope that it will be --
-- useful, but WITHOUT ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- --
-- --
-- --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- --
-- --
-- --
-- --
-- --
-- --
------------------------------------------------------------------------------
pragma Ada_2012;
with Ada.Calendar;
with Ada.Exceptions;
with Ada.Streams;
with Ada.Strings.Unbounded;
with Ada.Text_IO;
with Ada.Unchecked_Deallocation;
with Ada.Containers.Vectors;
with AWS.Messages;
with AWS.MIME;
with AWS.Net.Buffered;
with AWS.Net.Generic_Sets;
with AWS.Parameters;
with AWS.Services.Dispatchers.URI;
with AWS.Templates;
with AWS.Utils;
package body AWS.Services.Download is
use Ada;
use Ada.Containers;
use Ada.Exceptions;
use Ada.Streams;
use Ada.Strings.Unbounded;
URI_Prefix : constant String := "$dm_prefix$";
-- The URI prefix used for all the download manager request
W_Tmplt : constant String := "aws_download_manager_waiting.thtml";
S_Tmplt : constant String := "aws_download_manager_start.thtml";
type Waiting_Position is new Natural;
-- The position in the waiting line, 0 means that the download can be
-- started. 1 means in the first position in the waiting line, the download
-- will start as soon as a download terminates.
type Download_Information is record
URI : Unbounded_String; -- download manager unique key URI
Name : Unbounded_String; -- the resource name (filename)
R_URI : Unbounded_String; -- the resource URI
Started : Boolean; -- True if download can start
Header : Boolean; -- True if HTTP header sent
Stream : Resources.Streams.Stream_Access; -- data stream (input)
Socket : Net.Socket_Access; -- client socket (output)
Position : Waiting_Position; -- position in the waiting line
Index : Positive; -- item vector index (for fast update)
Time_Stamp : Calendar.Time; -- when the download was created
end record;
No_Information : constant Download_Information :=
(Null_Unbounded_String, Null_Unbounded_String,
Null_Unbounded_String, False, False, null, null,
0, 1, Calendar.Clock);
package Download_Vectors is
new Containers.Vectors (Positive, Download_Information);
use Download_Vectors;
-- The task that handles the downloads
task type Download_Manager with Priority => Config.Service_Priority is
end Download_Manager;
type Download_Manager_Access is access Download_Manager;
DM : Download_Manager_Access;
-- The download manager created in the start routine
-- The socket set (multiplexer)
Max_Concurrent_Download : Positive;
package Sock_Set is new Net.Generic_Sets (Download_Information);
-- Data manager
protected Data_Manager is
procedure Insert (Download : Download_Information);
-- Add a new download data information
procedure Update (Download : Download_Information);
-- Update the download information (Download.URI is the unique key)
procedure Remove (Download : Download_Information);
-- Remove the download information, this is either because the download
-- is terminated or an error occurs during the download (interrupted by
-- the user).
entry Ready;
-- Returns if there is at least one download to do
procedure Create_Set (Socket_Set : in out Sock_Set.Socket_Set_Type);
-- Returns in Socket_Set the socket to look at for output availability
procedure Get (URI : String; Download : out Download_Information);
-- Returns the Download_Information for the given URI or No_Information
-- if this URI is not part of the download data. Note that this routine
-- also set the Index and Position fields according to the position in
-- the vector.
procedure Get_UID (UID : out Positive);
-- Returns a unique ID
procedure Set_Shutdown;
-- Download manager shutdown requested
function Shutdown return Boolean;
-- Returns the shutdown status
procedure Release;
-- Release memory associated with the data manager
private
procedure Check_Queue;
-- Check all sockets in the queue and set Socket_Present if sockets are
-- present so waiting for data.
Count : Natural := 0;
-- Set to true when there is nothing to do
Downloads : Vector;
function Index (Download : Download_Information) return Positive;
-- Returns the updated index for Download, 0 if not found
UID : Natural := 0;
Closing : Boolean := False;
Socket_Present : Boolean := False;
end Data_Manager;
----------------
-- DM_Handler --
----------------
DM_Handler : Dispatchers.URI.Handler;
function CB (Request : Status.Data) return Response.Data;
-- Download manager callback handler
-----------
-- Build --
-----------
function Build
(Request : Status.Data;
Name : String;
Resource : not null access Resources.Streams.Stream_Type'Class)
return Response.Data
is
UID : Positive;
begin
Data_Manager.Get_UID (UID);
declare
Key_URI : constant String :=
Status.URI (Request) & "$" & Utils.Image (UID);
begin
Data_Manager.Insert
(Download =>
(To_Unbounded_String (Key_URI), To_Unbounded_String (Name),
To_Unbounded_String (Status.URI (Request)),
False, False,
Resources.Streams.Stream_Access (Resource), null,
0, 1, Calendar.Clock));
return Response.URL
("/" & URI_Prefix & "?RES_URI=" & Key_URI,
Cache_Control => Messages.No_Cache);
end;
end Build;
--------
-- CB --
--------
function CB (Request : Status.Data) return Response.Data is
P_List : constant Parameters.List := Status.Parameters (Request);
URI : constant String := Parameters.Get (P_List, "RES_URI");
Info : Download_Information;
begin
Data_Manager.Get (URI, Info);
if Info = No_Information then
-- This should not happen, guard against bad URL (reload after
-- interrupted download).
return Response.Acknowledge
(Messages.S404, "<p>Download manager page not registered!");
end if;
if Info.Position = 0 then
-- Download can be started now
if Info.Started then
-- Let's go now, set the client side socket
Info.Socket := new Net.Socket_Type'Class'(Status.Socket (Request));
Data_Manager.Update (Info);
return Response.Socket_Taken;
else
-- Display the start page before launching the download
Info.Started := True;
Data_Manager.Update (Info);
return Response.Build
(MIME.Text_HTML,
String'(Templates.Parse
(S_Tmplt,
(1 => Templates.Assoc ("NAME", To_String (Info.Name)),
2 => Templates.Assoc
("RES_URI", To_String (Info.R_URI))))));
end if;
else
return Response.Build
(MIME.Text_HTML,
String'(Templates.Parse
(W_Tmplt,
(1 => Templates.Assoc ("NAME", To_String (Info.Name)),
2 => Templates.Assoc ("RES_URI", To_String (Info.R_URI)),
3 => Templates.Assoc
("POSITION", Positive (Info.Position))))));
end if;
end CB;
----------
-- Data --
----------
protected body Data_Manager is
-----------------
-- Check_Queue --
-----------------
procedure Check_Queue is
use type Net.Socket_Access;
begin
Socket_Present := False;
Check_Socket_Present : for K in 1 .. Natural (Downloads.Length) loop
if Downloads.Element (K).Socket /= null then
Socket_Present := True;
exit Check_Socket_Present;
end if;
end loop Check_Socket_Present;
end Check_Queue;
----------------
-- Create_Set --
----------------
procedure Create_Set (Socket_Set : in out Sock_Set.Socket_Set_Type) is
use type Net.Socket_Access;
Info : Download_Information;
N : Positive;
begin
N := Positive'Min
(Max_Concurrent_Download, Positive (Downloads.Length));
for K in 1 .. N loop
Info := Downloads.Element (K);
if Info.Socket /= null then
Sock_Set.Add (Socket_Set, Info.Socket, Sock_Set.Output);
Sock_Set.Set_Data (Socket_Set, Sock_Set.Socket_Count (K), Info);
end if;
end loop;
end Create_Set;
---------
-- Get --
---------
procedure Get (URI : String; Download : out Download_Information) is
use type Calendar.Time;
Info : Download_Information;
Index : Natural := 0;
begin
-- First remove old entries which have not been checked for at least
-- 15 seconds.
Remove_Old_Entries : while not Downloads.Is_Empty loop
Info := Downloads.First_Element;
if Calendar.Clock - Info.Time_Stamp > 15.0 then
Downloads.Delete_First;
Count := Count - 1;
else
exit Remove_Old_Entries;
end if;
end loop Remove_Old_Entries;
-- Look for the given URI in the vector
for K in 1 .. Natural (Downloads.Length) loop
Info := Downloads.Element (K);
if URI = To_String (Info.URI) then
Index := K;
exit;
end if;
end loop;
if Index = 0 then
-- Not found
Info := No_Information;
else
Info.Index := Index;
-- As this download was checked, update time-stamp
Info.Time_Stamp := Calendar.Clock;
Downloads.Replace_Element (Index, Info);
if Index <= Max_Concurrent_Download then
Info.Position := 0;
else
Info.Position :=
Waiting_Position (Index - Max_Concurrent_Download);
end if;
end if;
Download := Info;
Check_Queue;
end Get;
-------------
-- Get_UID --
-------------
procedure Get_UID (UID : out Positive) is
begin
Data_Manager.UID := Data_Manager.UID + 1;
UID := Data_Manager.UID;
end Get_UID;
-----------
-- Index --
-----------
function Index (Download : Download_Information) return Positive is
begin
-- Use Download.Index for fast lookup, this was the original position
-- for this item. The new position is either at the same index or in
-- a lower position in case some downloads have endded since we got
-- this item.
for K in reverse 1 .. Download.Index loop
if Download.URI = Downloads.Element (K).URI then
return K;
end if;
end loop;
raise Constraint_Error;
end Index;
------------
-- Insert --
------------
procedure Insert (Download : Download_Information) is
begin
Downloads.Append (Download);
Count := Count + 1;
end Insert;
-----------
-- Ready --
-----------
entry Ready when Socket_Present or else Closing is
begin
null;
end Ready;
-------------
-- Release --
-------------
procedure Release is
begin
Downloads.Clear;
Socket_Present := False;
Count := 0;
end Release;
------------
-- Remove --
------------
procedure Remove (Download : Download_Information) is
begin
Downloads.Delete (Index (Download));
Count := Count - 1;
Check_Queue;
end Remove;
------------------
-- Set_Shutdown --
------------------
procedure Set_Shutdown is
begin
Closing := True;
end Set_Shutdown;
--------------
-- Shutdown --
--------------
function Shutdown return Boolean is
begin
return Closing;
end Shutdown;
------------
-- Update --
------------
procedure Update (Download : Download_Information) is
use type Net.Socket_Access;
begin
-- Set Socket_Ready status if a socket is available
if Download.Socket /= null then
Socket_Present := True;
end if;
Downloads.Replace_Element (Index (Download), Download);
end Update;
end Data_Manager;
----------------------
-- Download_Manager --
----------------------
task body Download_Manager is
procedure Send_Header
(Socket_Set : in out Sock_Set.Socket_Set_Type;
N : Sock_Set.Socket_Count;
Info : in out Download_Information);
-- Send HTTP headers
procedure Send_Data
(Info : Download_Information;
Done : out Boolean);
-- Send some data for Info. Done is set to true if the download is
-- completed.
---------------
-- Send_Data --
---------------
procedure Send_Data
(Info : Download_Information;
Done : out Boolean)
is
Buffer_Size : constant := 4 * 1_024;
Buffer : Streams.Stream_Element_Array (1 .. Buffer_Size);
Last : Streams.Stream_Element_Offset;
begin
Resources.Streams.Read (Info.Stream.all, Buffer, Last);
Done := Last < Buffer'First;
if not Done then
Net.Buffered.Write (Info.Socket.all, Buffer (1 .. Last));
end if;
end Send_Data;
-----------------
-- Send_Header --
-----------------
procedure Send_Header
(Socket_Set : in out Sock_Set.Socket_Set_Type;
N : Sock_Set.Socket_Count;
Info : in out Download_Information)
is
pragma Unreferenced (Socket_Set, N);
Sock : constant Net.Socket_Type'Class := Info.Socket.all;
begin
Info.Header := True;
Data_Manager.Update (Info);
Net.Buffered.Put_Line (Sock, Messages.Status_Line (Messages.S200));
Net.Buffered.Put_Line
(Sock,
"Date: " & Messages.To_HTTP_Date (Utils.GMT_Clock));
-- Server
Net.Buffered.Put_Line
(Sock,
"Server: AWS (Ada Web Server) v" & Version);
Net.Buffered.Put_Line (Sock, Messages.Connection ("close"));
Net.Buffered.Put_Line
(Sock, Messages.Content_Length
(Resources.Streams.Size (Info.Stream.all)));
Net.Buffered.Put_Line
(Sock, Messages.Content_Type (MIME.Application_Octet_Stream));
Net.Buffered.Put_Line
(Sock, Messages.Content_Disposition
("attachment", To_String (Info.Name), To_String (Info.Name)));
Net.Buffered.New_Line (Sock);
Net.Buffered.Flush (Sock);
end Send_Header;
Socket_Set : Sock_Set.Socket_Set_Type;
Count : Sock_Set.Socket_Count;
Done : Boolean;
begin
Main : loop
Data_Manager.Ready;
exit Main when Data_Manager.Shutdown;
-- Some data are ready to be sent
Data_Manager.Create_Set (Socket_Set);
Sock_Set.Wait (Socket_Set, Net.Forever, Count);
-- For all write ready socket, send some data
for K in 1 .. Sock_Set.Count (Socket_Set) loop
Done := False;
declare
Info : Download_Information :=
Sock_Set.Get_Data (Socket_Set, K);
begin
if Sock_Set.Is_Write_Ready (Socket_Set, K) then
begin
if not Info.Header then
Send_Header (Socket_Set, K, Info);
end if;
Send_Data (Info, Done);
if Done then
Net.Buffered.Flush (Info.Socket.all);
Net.Shutdown (Info.Socket.all);
end if;
exception
when Net.Socket_Error =>
Done := True;
end;
if Done then
Resources.Streams.Close (Info.Stream.all);
end if;
elsif Sock_Set.Is_Error (Socket_Set, K) then
Done := True;
end if;
if Done then
-- Remove this socket from the server
Data_Manager.Remove (Info);
end if;
end;
end loop;
Sock_Set.Reset (Socket_Set);
end loop Main;
exception
when E : others =>
Text_IO.Put_Line
(Text_IO.Current_Error,
"Download manager bug detected: " & Exception_Information (E));
end Download_Manager;
-----------
-- Start --
-----------
procedure Start
(Server_Dispatcher : AWS.Dispatchers.Handler'Class;
Main_Dispatcher : out Services.Dispatchers.Linker.Handler;
Max_Concurrent_Download : Positive := Config.Max_Concurrent_Download) is
begin
Download.Max_Concurrent_Download := Max_Concurrent_Download;
-- Set the dispatcher
Dispatchers.URI.Register (DM_Handler, "/" & URI_Prefix, CB'Access, True);
Dispatchers.Linker.Register
(Main_Dispatcher, Server_Dispatcher, DM_Handler);
-- Start download manager task
DM := new Download_Manager;
end Start;
----------
-- Stop --
----------
procedure Stop is
procedure Unchecked_Free is new Unchecked_Deallocation
(Download_Manager, Download_Manager_Access);
begin
Dispatchers.URI.Unregister (DM_Handler, "/" & URI_Prefix);
Data_Manager.Set_Shutdown;
while not DM'Terminated loop
delay 0.1;
end loop;
Unchecked_Free (DM);
Data_Manager.Release;
end Stop;
end AWS.Services.Download;
|