2 Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
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.
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.
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.
21 * @brief Utility methods.
28 #include <boost/filesystem.hpp>
29 #include <boost/lexical_cast.hpp>
30 #include <openssl/sha.h>
31 #include <libxml++/nodes/element.h>
32 #include <libxml++/document.h>
33 #include <xmlsec/xmldsig.h>
34 #include <xmlsec/dl.h>
35 #include <xmlsec/app.h>
37 #include "KM_fileio.h"
40 #include "exceptions.h"
42 #include "argb_frame.h"
43 #include "certificates.h"
44 #include "gamma_lut.h"
45 #include "xyz_frame.h"
49 using std::stringstream;
55 using boost::shared_ptr;
56 using boost::lexical_cast;
57 using namespace libdcp;
67 Kumu::GenRandomValue (id);
68 id.EncodeHex (buffer, 64);
69 return string (buffer);
73 /** Create a digest for a file.
74 * @param filename File name.
75 * @param progress Pointer to a progress reporting function, or 0. The function will be called
76 * with a progress value between 0 and 1.
80 libdcp::make_digest (string filename, boost::function<void (float)>* progress)
82 Kumu::FileReader reader;
83 if (ASDCP_FAILURE (reader.OpenRead (filename.c_str ()))) {
84 boost::throw_exception (FileError ("could not open file to compute digest", filename));
90 int const buffer_size = 65536;
91 Kumu::ByteString read_buffer (buffer_size);
93 Kumu::fsize_t done = 0;
94 Kumu::fsize_t const size = reader.Size ();
97 Kumu::Result_t r = reader.Read (read_buffer.Data(), read_buffer.Capacity(), &read);
99 if (r == Kumu::RESULT_ENDOFFILE) {
101 } else if (ASDCP_FAILURE (r)) {
102 boost::throw_exception (FileError ("could not read file to compute digest", filename));
105 SHA1_Update (&sha, read_buffer.Data(), read);
108 (*progress) (float (done) / size);
113 byte_t byte_buffer[20];
114 SHA1_Final (byte_buffer, &sha);
117 return Kumu::base64encode (byte_buffer, 20, digest, 64);
120 /** Convert a content kind to a string which can be used in a
121 * <ContentKind> node.
122 * @param kind ContentKind.
126 libdcp::content_kind_to_string (ContentKind kind)
138 return "transitional";
145 case PUBLIC_SERVICE_ANNOUNCEMENT:
148 return "advertisement";
154 /** Convert a string from a <ContentKind> node to a libdcp ContentKind.
155 * Reasonably tolerant about varying case.
156 * @param type Content kind string.
157 * @return libdcp ContentKind.
160 libdcp::content_kind_from_string (string type)
162 /* XXX: should probably just convert type to lower-case and have done with it */
164 if (type == "feature") {
166 } else if (type == "short") {
168 } else if (type == "trailer" || type == "Trailer") {
170 } else if (type == "test") {
172 } else if (type == "transitional") {
174 } else if (type == "rating") {
176 } else if (type == "teaser" || type == "Teaser") {
178 } else if (type == "policy") {
180 } else if (type == "psa") {
181 return PUBLIC_SERVICE_ANNOUNCEMENT;
182 } else if (type == "advertisement") {
183 return ADVERTISEMENT;
189 /** Decompress a JPEG2000 image to a bitmap.
190 * @param data JPEG2000 data.
191 * @param size Size of data in bytes.
192 * @param reduce A power of 2 by which to reduce the size of the decoded image;
193 * e.g. 0 reduces by (2^0 == 1), ie keeping the same size.
194 * 1 reduces by (2^1 == 2), ie halving the size of the image.
195 * This is useful for scaling 4K DCP images down to 2K.
198 shared_ptr<libdcp::XYZFrame>
199 libdcp::decompress_j2k (uint8_t* data, int64_t size, int reduce)
201 opj_dinfo_t* decoder = opj_create_decompress (CODEC_J2K);
202 opj_dparameters_t parameters;
203 opj_set_default_decoder_parameters (¶meters);
204 parameters.cp_reduce = reduce;
205 opj_setup_decoder (decoder, ¶meters);
206 opj_cio_t* cio = opj_cio_open ((opj_common_ptr) decoder, data, size);
207 opj_image_t* image = opj_decode (decoder, cio);
209 opj_destroy_decompress (decoder);
211 boost::throw_exception (DCPReadError ("could not decode JPEG2000 codestream of " + lexical_cast<string> (size) + " bytes."));
216 image->x1 = rint (float(image->x1) / pow (2, reduce));
217 image->y1 = rint (float(image->y1) / pow (2, reduce));
218 return shared_ptr<XYZFrame> (new XYZFrame (image));
221 /** @param s A string.
222 * @return true if the string contains only space, newline or tab characters, or is empty.
225 libdcp::empty_or_white_space (string s)
227 for (size_t i = 0; i < s.length(); ++i) {
228 if (s[i] != ' ' && s[i] != '\n' && s[i] != '\t') {
239 if (xmlSecInit() < 0) {
240 throw MiscError ("could not initialise xmlsec");
243 #ifdef XMLSEC_CRYPTO_DYNAMIC_LOADING
244 if (xmlSecCryptoDLLoadLibrary(BAD_CAST XMLSEC_CRYPTO) < 0) {
245 throw MiscError ("unable to load default xmlsec-crypto library");
249 if (xmlSecCryptoAppInit(0) < 0) {
250 throw MiscError ("could not initialise crypto");
253 if (xmlSecCryptoInit() < 0) {
254 throw MiscError ("could not initialise xmlsec-crypto");
258 /** Sign an XML node. This function takes a certificate chain (to prove that the sender is bona fide) and
259 * a private key with which to sign the node.
261 * @param parent Node to sign.
262 * @param certificates Certificate chain for the signer.
263 * @param signer_key Filename of the private key of the signer.
264 * @param ns Namespace to use for the signature XML nodes.
267 libdcp::add_signature_value (xmlpp::Element* parent, CertificateChain const & certificates, boost::filesystem::path signer_key, string const & ns)
269 parent->add_child("SignatureValue", ns);
271 /* Add the certificate chain to a KeyInfo child node of parent */
272 xmlpp::Element* key_info = parent->add_child("KeyInfo", ns);
273 list<shared_ptr<Certificate> > c = certificates.leaf_to_root ();
274 for (list<shared_ptr<Certificate> >::iterator i = c.begin(); i != c.end(); ++i) {
275 xmlpp::Element* data = key_info->add_child("X509Data", ns);
278 xmlpp::Element* serial = data->add_child("X509IssuerSerial", ns);
279 serial->add_child("X509IssuerName", ns)->add_child_text((*i)->issuer ());
280 serial->add_child("X509SerialNumber", ns)->add_child_text((*i)->serial ());
283 data->add_child("X509Certificate", ns)->add_child_text((*i)->certificate());
286 xmlSecDSigCtxPtr signature_context = xmlSecDSigCtxCreate (0);
287 if (signature_context == 0) {
288 throw MiscError ("could not create signature context");
291 signature_context->signKey = xmlSecCryptoAppKeyLoad (signer_key.c_str(), xmlSecKeyDataFormatPem, 0, 0, 0);
292 if (signature_context->signKey == 0) {
293 throw FileError ("could not load private key file", signer_key);
296 /* XXX: set key name to the file name: is this right? */
297 if (xmlSecKeySetName (signature_context->signKey, reinterpret_cast<const xmlChar *> (signer_key.c_str())) < 0) {
298 throw MiscError ("could not set key name");
301 if (xmlSecDSigCtxSign (signature_context, parent->cobj ()) < 0) {
302 throw MiscError ("could not sign");
305 xmlSecDSigCtxDestroy (signature_context);
310 libdcp::add_signer (xmlpp::Element* parent, CertificateChain const & certificates, string const & ns)
312 xmlpp::Element* signer = parent->add_child("Signer");
315 xmlpp::Element* data = signer->add_child("X509Data", ns);
318 xmlpp::Element* serial_element = data->add_child("X509IssuerSerial", ns);
319 serial_element->add_child("X509IssuerName", ns)->add_child_text (certificates.leaf()->issuer());
320 serial_element->add_child("X509SerialNumber", ns)->add_child_text (certificates.leaf()->serial());
323 data->add_child("X509SubjectName", ns)->add_child_text (certificates.leaf()->subject());
327 /** @param signer_key Filename of private key to sign with */
329 libdcp::sign (xmlpp::Element* parent, CertificateChain const & certificates, boost::filesystem::path signer_key, bool interop)
331 add_signer (parent, certificates, "dsig");
333 xmlpp::Element* signature = parent->add_child("Signature", "dsig");
336 xmlpp::Element* signed_info = signature->add_child ("SignedInfo", "dsig");
337 signed_info->add_child("CanonicalizationMethod", "dsig")->set_attribute ("Algorithm", "http://www.w3.org/TR/2001/REC-xml-c14n-20010315");
340 signed_info->add_child("SignatureMethod", "dsig")->set_attribute("Algorithm", "http://www.w3.org/2000/09/xmldsig#rsa-sha1");
342 signed_info->add_child("SignatureMethod", "dsig")->set_attribute("Algorithm", "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256");
346 xmlpp::Element* reference = signed_info->add_child("Reference", "dsig");
347 reference->set_attribute ("URI", "");
349 xmlpp::Element* transforms = reference->add_child("Transforms", "dsig");
350 transforms->add_child("Transform", "dsig")->set_attribute (
351 "Algorithm", "http://www.w3.org/2000/09/xmldsig#enveloped-signature"
354 reference->add_child("DigestMethod", "dsig")->set_attribute("Algorithm", "http://www.w3.org/2000/09/xmldsig#sha1");
355 /* This will be filled in by the signing later */
356 reference->add_child("DigestValue", "dsig");
360 add_signature_value (signature, certificates, signer_key, "dsig");
363 bool libdcp::operator== (libdcp::Size const & a, libdcp::Size const & b)
365 return (a.width == b.width && a.height == b.height);
368 bool libdcp::operator!= (libdcp::Size const & a, libdcp::Size const & b)
373 /** The base64 decode routine in KM_util.cpp gives different values to both
374 * this and the command-line base64 for some inputs. Not sure why.
377 libdcp::base64_decode (string const & in, unsigned char* out, int out_length)
379 BIO* b64 = BIO_new (BIO_f_base64 ());
381 /* This means the input should have no newlines */
382 BIO_set_flags (b64, BIO_FLAGS_BASE64_NO_NL);
384 /* Copy our input string, removing newlines */
385 char in_buffer[in.size() + 1];
387 for (size_t i = 0; i < in.size(); ++i) {
388 if (in[i] != '\n' && in[i] != '\r') {
393 BIO* bmem = BIO_new_mem_buf (in_buffer, p - in_buffer);
394 bmem = BIO_push (b64, bmem);
395 int const N = BIO_read (bmem, out, out_length);
402 libdcp::tm_to_string (struct tm* tm)
405 strftime (buffer, 64, "%Y-%m-%dT%I:%M:%S", tm);
410 offset = tm->tm_gmtoff / 60;
412 TIME_ZONE_INFORMATION tz;
413 GetTimeZoneInformation (&tz);
417 return string (buffer) + utc_offset_to_string (offset);
420 /** @param b Offset from UTC to local time in minutes.
421 * @return string of the form e.g. -01:00.
424 libdcp::utc_offset_to_string (int b)
426 bool const negative = (b < 0);
427 b = negative ? -b : b;
429 int const hours = b / 60;
430 int const minutes = b % 60;
439 o << setw(2) << setfill('0') << hours << ":" << setw(2) << setfill('0') << minutes;
444 libdcp::ptime_to_string (boost::posix_time::ptime t)
446 struct tm t_tm = boost::posix_time::to_tm (t);
447 return tm_to_string (&t_tm);