src/cpl.cc

   1 /*
   2     Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
   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 as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <fstream>
  21 #include <libxml/parser.h>
  22 #include "cpl.h"
  23 #include "parse/cpl.h"
  24 #include "util.h"
  25 #include "picture_asset.h"
  26 #include "sound_asset.h"
  27 #include "subtitle_asset.h"
  28 #include "parse/asset_map.h"
  29 #include "reel.h"
  30 #include "metadata.h"
  31 #include "encryption.h"
  32 #include "exceptions.h"
  33 #include "compose.hpp"
  34
  35 using std::string;
  36 using std::stringstream;
  37 using std::ofstream;
  38 using std::ostream;
  39 using std::list;
  40 using boost::shared_ptr;
  41 using boost::lexical_cast;
  42 using namespace libdcp;
  43
  44 CPL::CPL (string directory, string name, ContentKind content_kind, int length, int frames_per_second)
  45         : _directory (directory)
  46         , _name (name)
  47         , _content_kind (content_kind)
  48         , _length (length)
  49         , _fps (frames_per_second)
  50 {
  51         _id = make_uuid ();
  52 }
  53
  54 /** Construct a CPL object from a XML file.
  55  *  @param directory The directory containing this CPL's DCP.
  56  *  @param file The CPL XML filename.
  57  *  @param asset_map The corresponding asset map.
  58  *  @param require_mxfs true to throw an exception if a required MXF file does not exist.
  59  */
  60 CPL::CPL (string directory, string file, shared_ptr<const libdcp::parse::AssetMap> asset_map, bool require_mxfs)
  61         : _directory (directory)
  62         , _content_kind (FEATURE)
  63         , _length (0)
  64         , _fps (0)
  65 {
  66         /* Read the XML */
  67         shared_ptr<parse::CPL> cpl;
  68         try {
  69                 cpl.reset (new parse::CPL (file));
  70         } catch (FileError& e) {
  71                 boost::throw_exception (FileError ("could not load CPL file", file));
  72         }
  73
  74         /* Now cherry-pick the required bits into our own data structure */
  75
  76         _name = cpl->annotation_text;
  77         _content_kind = cpl->content_kind;
  78
  79         /* Trim urn:uuid: off the front */
  80         _id = cpl->id.substr (9);
  81
  82         for (list<shared_ptr<libdcp::parse::Reel> >::iterator i = cpl->reels.begin(); i != cpl->reels.end(); ++i) {
  83
  84                 shared_ptr<parse::Picture> p;
  85
  86                 if ((*i)->asset_list->main_picture) {
  87                         p = (*i)->asset_list->main_picture;
  88                 } else {
  89                         p = (*i)->asset_list->main_stereoscopic_picture;
  90                 }
  91
  92                 _fps = p->edit_rate.numerator;
  93                 _length += p->duration;
  94
  95                 shared_ptr<PictureAsset> picture;
  96                 shared_ptr<SoundAsset> sound;
  97                 shared_ptr<SubtitleAsset> subtitle;
  98
  99                 /* Some rather twisted logic to decide if we are 3D or not;
 100                    some DCPs give a MainStereoscopicPicture to indicate 3D, others
 101                    just have a FrameRate twice the EditRate and apparently
 102                    expect you to divine the fact that they are hence 3D.
 103                 */
 104
 105                 if (!(*i)->asset_list->main_stereoscopic_picture && p->edit_rate == p->frame_rate) {
 106
 107                         try {
 108                                 picture.reset (new MonoPictureAsset (
 109                                                        _directory,
 110                                                        asset_map->asset_from_id (p->id)->chunks.front()->path
 111                                                        )
 112                                         );
 113
 114                                 picture->set_entry_point (p->entry_point);
 115                                 picture->set_duration (p->duration);
 116                                 if (p->key_id.length() > 9) {
 117                                         /* Trim urn:uuid: */
 118                                         picture->set_key_id (p->key_id.substr (9));
 119                                 }
 120                         } catch (MXFFileError) {
 121                                 if (require_mxfs) {
 122                                         throw;
 123                                 }
 124                         }
 125
 126                 } else {
 127                         try {
 128                                 picture.reset (new StereoPictureAsset (
 129                                                        _directory,
 130                                                        asset_map->asset_from_id (p->id)->chunks.front()->path,
 131                                                        _fps,
 132                                                        p->duration
 133                                                        )
 134                                         );
 135
 136                                 picture->set_entry_point (p->entry_point);
 137                                 picture->set_duration (p->duration);
 138                                 if (p->key_id.length() > 9) {
 139                                         /* Trim urn:uuid: */
 140                                         picture->set_key_id (p->key_id.substr (9));
 141                                 }
 142
 143                         } catch (MXFFileError) {
 144                                 if (require_mxfs) {
 145                                         throw;
 146                                 }
 147                         }
 148
 149                 }
 150
 151                 if ((*i)->asset_list->main_sound) {
 152
 153                         try {
 154                                 sound.reset (new SoundAsset (
 155                                                      _directory,
 156                                                      asset_map->asset_from_id ((*i)->asset_list->main_sound->id)->chunks.front()->path
 157                                                      )
 158                                         );
 159
 160                                 shared_ptr<parse::MainSound> s = (*i)->asset_list->main_sound;
 161
 162                                 sound->set_entry_point (s->entry_point);
 163                                 sound->set_duration (s->duration);
 164                                 if (s->key_id.length() > 9) {
 165                                         /* Trim urn:uuid: */
 166                                         sound->set_key_id (s->key_id.substr (9));
 167                                 }
 168                         } catch (MXFFileError) {
 169                                 if (require_mxfs) {
 170                                         throw;
 171                                 }
 172                         }
 173                 }
 174
 175                 if ((*i)->asset_list->main_subtitle) {
 176
 177                         subtitle.reset (new SubtitleAsset (
 178                                                 _directory,
 179                                                 asset_map->asset_from_id ((*i)->asset_list->main_subtitle->id)->chunks.front()->path
 180                                                 )
 181                                 );
 182
 183                         subtitle->set_entry_point ((*i)->asset_list->main_subtitle->entry_point);
 184                         subtitle->set_duration ((*i)->asset_list->main_subtitle->duration);
 185                 }
 186
 187                 _reels.push_back (shared_ptr<Reel> (new Reel (picture, sound, subtitle)));
 188         }
 189 }
 190
 191 void
 192 CPL::add_reel (shared_ptr<Reel> reel)
 193 {
 194         _reels.push_back (reel);
 195 }
 196
 197 void
 198 CPL::write_xml (XMLMetadata const & metadata, shared_ptr<Encryption> crypt) const
 199 {
 200         boost::filesystem::path p;
 201         p /= _directory;
 202         stringstream s;
 203         s << _id << "_cpl.xml";
 204         p /= s.str();
 205
 206         xmlpp::Document doc;
 207         xmlpp::Element* root = doc.create_root_node ("CompositionPlaylist", "http://www.smpte-ra.org/schemas/429-7/2006/CPL");
 208
 209         if (crypt) {
 210                 root->set_namespace_declaration ("http://www.w3.org/2000/09/xmldsig#", "dsig");
 211         }
 212
 213         root->add_child("Id")->add_child_text ("urn:uuid:" + _id);
 214         root->add_child("AnnotationText")->add_child_text (_name);
 215         root->add_child("IssueDate")->add_child_text (metadata.issue_date);
 216         root->add_child("Creator")->add_child_text (metadata.creator);
 217         root->add_child("ContentTitleText")->add_child_text (_name);
 218         root->add_child("ContentKind")->add_child_text (content_kind_to_string (_content_kind));
 219         {
 220                 xmlpp::Node* cv = root->add_child ("ContentVersion");
 221                 cv->add_child ("Id")->add_child_text ("urn:uri:" + _id + "_" + metadata.issue_date);
 222                 cv->add_child ("LabelText")->add_child_text (_id + "_" + metadata.issue_date);
 223         }
 224         root->add_child("RatingList");
 225
 226         xmlpp::Node* reel_list = root->add_child ("ReelList");
 227
 228         for (list<shared_ptr<Reel> >::const_iterator i = _reels.begin(); i != _reels.end(); ++i) {
 229                 (*i)->write_to_cpl (reel_list);
 230         }
 231
 232         if (crypt) {
 233                 sign (root, crypt->certificates, crypt->signer_key);
 234         }
 235
 236         doc.write_to_file_formatted (p.string (), "UTF-8");
 237
 238         _digest = make_digest (p.string ());
 239         _length = boost::filesystem::file_size (p.string ());
 240 }
 241
 242 void
 243 CPL::write_to_pkl (xmlpp::Node* node) const
 244 {
 245         xmlpp::Node* asset = node->add_child ("Asset");
 246         asset->add_child("Id")->add_child_text ("urn:uuid:" + _id);
 247         asset->add_child("Hash")->add_child_text (_digest);
 248         asset->add_child("Size")->add_child_text (lexical_cast<string> (_length));
 249         asset->add_child("Type")->add_child_text ("text/xml");
 250 }
 251
 252 list<shared_ptr<const Asset> >
 253 CPL::assets () const
 254 {
 255         list<shared_ptr<const Asset> > a;
 256         for (list<shared_ptr<Reel> >::const_iterator i = _reels.begin(); i != _reels.end(); ++i) {
 257                 if ((*i)->main_picture ()) {
 258                         a.push_back ((*i)->main_picture ());
 259                 }
 260                 if ((*i)->main_sound ()) {
 261                         a.push_back ((*i)->main_sound ());
 262                 }
 263                 if ((*i)->main_subtitle ()) {
 264                         a.push_back ((*i)->main_subtitle ());
 265                 }
 266         }
 267
 268         return a;
 269 }
 270
 271 void
 272 CPL::write_to_assetmap (xmlpp::Node* node) const
 273 {
 274         xmlpp::Node* asset = node->add_child ("Asset");
 275         asset->add_child("Id")->add_child_text ("urn:uuid:" + _id);
 276         xmlpp::Node* chunk_list = asset->add_child ("ChunkList");
 277         xmlpp::Node* chunk = chunk_list->add_child ("Chunk");
 278         chunk->add_child("Path")->add_child_text (_id + "_cpl.xml");
 279         chunk->add_child("VolumeIndex")->add_child_text ("1");
 280         chunk->add_child("Offset")->add_child_text("0");
 281         chunk->add_child("Length")->add_child_text(lexical_cast<string> (_length));
 282 }
 283
 284
 285
 286 bool
 287 CPL::equals (CPL const & other, EqualityOptions opt, boost::function<void (NoteType, string)> note) const
 288 {
 289         if (_name != other._name && !opt.cpl_names_can_differ) {
 290                 stringstream s;
 291                 s << "names differ: " << _name << " vs " << other._name << "\n";
 292                 note (ERROR, s.str ());
 293                 return false;
 294         }
 295
 296         if (_content_kind != other._content_kind) {
 297                 note (ERROR, "content kinds differ");
 298                 return false;
 299         }
 300
 301         if (_fps != other._fps) {
 302                 note (ERROR, String::compose ("frames per second differ (%1 vs %2)", _fps, other._fps));
 303                 return false;
 304         }
 305
 306         if (_length != other._length) {
 307                 stringstream s;
 308                 s << "lengths differ (" << _length << " cf " << other._length << ")";
 309                 note (ERROR, String::compose ("lengths differ (%1 vs %2)", _length, other._length));
 310                 return false;
 311         }
 312
 313         if (_reels.size() != other._reels.size()) {
 314                 note (ERROR, String::compose ("reel counts differ (%1 vs %2)", _reels.size(), other._reels.size()));
 315                 return false;
 316         }
 317
 318         list<shared_ptr<Reel> >::const_iterator a = _reels.begin ();
 319         list<shared_ptr<Reel> >::const_iterator b = other._reels.begin ();
 320
 321         while (a != _reels.end ()) {
 322                 if (!(*a)->equals (*b, opt, note)) {
 323                         return false;
 324                 }
 325                 ++a;
 326                 ++b;
 327         }
 328
 329         return true;
 330 }
 331
 332 shared_ptr<xmlpp::Document>
 333 CPL::make_kdm (
 334         CertificateChain const & certificates,
 335         string const & signer_key,
 336         shared_ptr<const Certificate> recipient_cert,
 337         boost::posix_time::ptime from,
 338         boost::posix_time::ptime until,
 339         MXFMetadata const & mxf_metadata,
 340         XMLMetadata const & xml_metadata
 341         ) const
 342 {
 343         assert (recipient_cert);
 344
 345         shared_ptr<xmlpp::Document> doc (new xmlpp::Document);
 346         xmlpp::Element* root = doc->create_root_node ("DCinemaSecurityMessage");
 347         root->set_namespace_declaration ("http://www.smpte-ra.org/schemas/430-3/2006/ETM", "");
 348         root->set_namespace_declaration ("http://www.w3.org/2000/09/xmldsig#", "ds");
 349         root->set_namespace_declaration ("http://www.w3.org/2001/04/xmlenc#", "enc");
 350
 351         {
 352                 xmlpp::Element* authenticated_public = root->add_child("AuthenticatedPublic");
 353                 authenticated_public->set_attribute("Id", "ID_AuthenticatedPublic");
 354                 xmlAddID (0, doc->cobj(), (const xmlChar *) "ID_AuthenticatedPublic", authenticated_public->get_attribute("Id")->cobj());
 355
 356                 authenticated_public->add_child("MessageId")->add_child_text ("urn:uuid:" + make_uuid());
 357                 authenticated_public->add_child("MessageType")->add_child_text ("http://www.smpte-ra.org/430-1/2006/KDM#kdm-key-type");
 358                 authenticated_public->add_child("AnnotationText")->add_child_text (mxf_metadata.product_name);
 359                 authenticated_public->add_child("IssueDate")->add_child_text (xml_metadata.issue_date);
 360
 361                 {
 362                         xmlpp::Element* signer = authenticated_public->add_child("Signer");
 363                         signer->add_child("X509IssuerName", "ds")->add_child_text (
 364                                 Certificate::name_for_xml (recipient_cert->issuer())
 365                                 );
 366                         signer->add_child("X509SerialNumber", "ds")->add_child_text (
 367                                 recipient_cert->serial()
 368                                 );
 369                 }
 370
 371                 {
 372                         xmlpp::Element* required_extensions = authenticated_public->add_child("RequiredExtensions");
 373
 374                         {
 375                                 xmlpp::Element* kdm_required_extensions = required_extensions->add_child("KDMRequiredExtensions");
 376                                 kdm_required_extensions->set_namespace_declaration ("http://www.smpte-ra.org/schemas/430-1/2006/KDM");
 377                                 {
 378                                         xmlpp::Element* recipient = kdm_required_extensions->add_child("Recipient");
 379                                         {
 380                                                 xmlpp::Element* serial_element = recipient->add_child("X509IssuerSerial");
 381                                                 serial_element->add_child("X509IssuerName", "ds")->add_child_text (
 382                                                         Certificate::name_for_xml (recipient_cert->issuer())
 383                                                         );
 384                                                 serial_element->add_child("X509SerialNumber", "ds")->add_child_text (
 385                                                         recipient_cert->serial()
 386                                                         );
 387                                         }
 388
 389                                         recipient->add_child("X509SubjectName")->add_child_text (Certificate::name_for_xml (recipient_cert->subject()));
 390                                 }
 391
 392                                 kdm_required_extensions->add_child("CompositionPlaylistId")->add_child_text("urn:uuid:" + _id);
 393                                 kdm_required_extensions->add_child("ContentTitleText")->add_child_text(_name);
 394                                 kdm_required_extensions->add_child("ContentAuthenticator")->add_child_text(certificates.leaf()->thumbprint());
 395                                 kdm_required_extensions->add_child("ContentKeysNotValidBefore")->add_child_text("XXX");
 396                                 kdm_required_extensions->add_child("ContentKeysNotValidAfter")->add_child_text("XXX");
 397
 398                                 {
 399                                         xmlpp::Element* authorized_device_info = kdm_required_extensions->add_child("AuthorizedDeviceInfo");
 400                                         authorized_device_info->add_child("DeviceListIdentifier")->add_child_text("urn:uuid:" + make_uuid());
 401                                         authorized_device_info->add_child("DeviceListDescription")->add_child_text(recipient_cert->subject());
 402                                         {
 403                                                 xmlpp::Element* device_list = authorized_device_info->add_child("DeviceList");
 404                                                 device_list->add_child("CertificateThumbprint")->add_child_text(recipient_cert->thumbprint());
 405                                         }
 406                                 }
 407
 408                                 {
 409                                         xmlpp::Element* key_id_list = kdm_required_extensions->add_child("KeyIdList");
 410                                         list<shared_ptr<const Asset> > a = assets();
 411                                         for (list<shared_ptr<const Asset> >::iterator i = a.begin(); i != a.end(); ++i) {
 412                                                 /* XXX: non-MXF assets? */
 413                                                 shared_ptr<const MXFAsset> mxf = boost::dynamic_pointer_cast<const MXFAsset> (*i);
 414                                                 if (mxf) {
 415                                                         mxf->add_typed_key_id (key_id_list);
 416                                                 }
 417                                         }
 418                                 }
 419
 420                                 {
 421                                         xmlpp::Element* forensic_mark_flag_list = kdm_required_extensions->add_child("ForensicMarkFlagList");
 422                                         forensic_mark_flag_list->add_child("ForensicMarkFlag")->add_child_text (
 423                                                 "http://www.smpte-ra.org/430-1/2006/KDM#mrkflg-picture-disable"
 424                                                 );
 425                                         forensic_mark_flag_list->add_child("ForensicMarkFlag")->add_child_text (
 426                                                 "http://www.smpte-ra.org/430-1/2006/KDM#mrkflg-audio-disable"
 427                                                 );
 428                                 }
 429                         }
 430                 }
 431
 432                 authenticated_public->add_child("NonCriticalExtensions");
 433         }
 434
 435         {
 436                 xmlpp::Element* authenticated_private = root->add_child("AuthenticatedPrivate");
 437                 authenticated_private->set_attribute ("Id", "ID_AuthenticatedPrivate");
 438                 xmlAddID (0, doc->cobj(), (const xmlChar *) "ID_AuthenticatedPrivate", authenticated_private->get_attribute("Id")->cobj());
 439                 {
 440                         xmlpp::Element* encrypted_key = authenticated_private->add_child ("EncryptedKey", "enc");
 441                         {
 442                                 xmlpp::Element* encryption_method = encrypted_key->add_child ("EncryptionMethod", "enc");
 443                                 encryption_method->set_attribute ("Algorithm", "http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p");
 444                                 encryption_method->add_child("DigestMethod", "ds")->set_attribute("Algorithm", "http://www.w3.org/2000/09/xmldsig#sha1");
 445                         }
 446
 447                         xmlpp::Element* cipher_data = authenticated_private->add_child ("CipherData", "enc");
 448                         cipher_data->add_child("CipherValue", "enc")->add_child_text("XXX");
 449                 }
 450         }
 451
 452         /* XXX: x2 one for each mxf? */
 453
 454         {
 455                 xmlpp::Element* signature = root->add_child("Signature", "ds");
 456
 457                 {
 458                         xmlpp::Element* signed_info = signature->add_child("SignedInfo", "ds");
 459                         signed_info->add_child("CanonicalizationMethod", "ds")->set_attribute(
 460                                 "Algorithm", "http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments"
 461                                 );
 462                         signed_info->add_child("SignatureMethod", "ds")->set_attribute(
 463                                 "Algorithm", "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"
 464                                 );
 465                         {
 466                                 xmlpp::Element* reference = signed_info->add_child("Reference", "ds");
 467                                 reference->set_attribute("URI", "#ID_AuthenticatedPublic");
 468                                 reference->add_child("DigestMethod", "ds")->set_attribute("Algorithm", "http://www.w3.org/2001/04/xmlenc#sha256");
 469                                 reference->add_child("DigestValue", "ds");
 470                         }
 471
 472                         {
 473                                 xmlpp::Element* reference = signed_info->add_child("Reference", "ds");
 474                                 reference->set_attribute("URI", "#ID_AuthenticatedPrivate");
 475                                 reference->add_child("DigestMethod", "ds")->set_attribute("Algorithm", "http://www.w3.org/2001/04/xmlenc#sha256");
 476                                 reference->add_child("DigestValue", "ds");
 477                         }
 478                 }
 479
 480                 add_signature_value (signature, certificates, signer_key, "ds");
 481         }
 482
 483         return doc;
 484 }
 485
 486 /** @return true if we have any encrypted content */
 487 bool
 488 CPL::encrypted () const
 489 {
 490         for (list<shared_ptr<Reel> >::const_iterator i = _reels.begin(); i != _reels.end(); ++i) {
 491                 if ((*i)->encrypted ()) {
 492                         return true;
 493                 }
 494         }
 495
 496         return false;
 497 }
 498
 499 void
 500 CPL::add_kdm (KDM const & kdm)
 501 {
 502         for (list<shared_ptr<Reel> >::const_iterator i = _reels.begin(); i != _reels.end(); ++i) {
 503                 (*i)->add_kdm (kdm);
 504         }
 505 }