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;
53 using boost::shared_ptr;
54 using boost::lexical_cast;
55 using namespace libdcp;
65 Kumu::GenRandomValue (id);
66 id.EncodeHex (buffer, 64);
67 return string (buffer);
71 /** Create a digest for a file.
72 * @param filename File name.
76 libdcp::make_digest (string filename)
78 Kumu::FileReader reader;
79 if (ASDCP_FAILURE (reader.OpenRead (filename.c_str ()))) {
80 boost::throw_exception (FileError ("could not open file to compute digest", filename));
86 Kumu::ByteString read_buffer (65536);
89 Kumu::Result_t r = reader.Read (read_buffer.Data(), read_buffer.Capacity(), &read);
91 if (r == Kumu::RESULT_ENDOFFILE) {
93 } else if (ASDCP_FAILURE (r)) {
94 boost::throw_exception (FileError ("could not read file to compute digest", filename));
97 SHA1_Update (&sha, read_buffer.Data(), read);
100 byte_t byte_buffer[20];
101 SHA1_Final (byte_buffer, &sha);
104 return Kumu::base64encode (byte_buffer, 20, digest, 64);
107 /** Convert a content kind to a string which can be used in a
108 * <ContentKind> node.
109 * @param kind ContentKind.
113 libdcp::content_kind_to_string (ContentKind kind)
125 return "transitional";
132 case PUBLIC_SERVICE_ANNOUNCEMENT:
135 return "advertisement";
141 /** Convert a string from a <ContentKind> node to a libdcp ContentKind.
142 * Reasonably tolerant about varying case.
143 * @param type Content kind string.
144 * @return libdcp ContentKind.
147 libdcp::content_kind_from_string (string type)
149 /* XXX: should probably just convert type to lower-case and have done with it */
151 if (type == "feature") {
153 } else if (type == "short") {
155 } else if (type == "trailer" || type == "Trailer") {
157 } else if (type == "test") {
159 } else if (type == "transitional") {
161 } else if (type == "rating") {
163 } else if (type == "teaser" || type == "Teaser") {
165 } else if (type == "policy") {
167 } else if (type == "psa") {
168 return PUBLIC_SERVICE_ANNOUNCEMENT;
169 } else if (type == "advertisement") {
170 return ADVERTISEMENT;
176 /** Decompress a JPEG2000 image to a bitmap.
177 * @param data JPEG2000 data.
178 * @param size Size of data in bytes.
179 * @param reduce A power of 2 by which to reduce the size of the decoded image;
180 * e.g. 0 reduces by (2^0 == 1), ie keeping the same size.
181 * 1 reduces by (2^1 == 2), ie halving the size of the image.
182 * This is useful for scaling 4K DCP images down to 2K.
185 shared_ptr<libdcp::XYZFrame>
186 libdcp::decompress_j2k (uint8_t* data, int64_t size, int reduce)
188 opj_dinfo_t* decoder = opj_create_decompress (CODEC_J2K);
189 opj_dparameters_t parameters;
190 opj_set_default_decoder_parameters (¶meters);
191 parameters.cp_reduce = reduce;
192 opj_setup_decoder (decoder, ¶meters);
193 opj_cio_t* cio = opj_cio_open ((opj_common_ptr) decoder, data, size);
194 opj_image_t* image = opj_decode (decoder, cio);
196 opj_destroy_decompress (decoder);
198 boost::throw_exception (DCPReadError ("could not decode JPEG2000 codestream of " + lexical_cast<string> (size) + " bytes."));
203 image->x1 = rint (float(image->x1) / pow (2, reduce));
204 image->y1 = rint (float(image->y1) / pow (2, reduce));
205 return shared_ptr<XYZFrame> (new XYZFrame (image));
208 /** @param s A string.
209 * @return true if the string contains only space, newline or tab characters, or is empty.
212 libdcp::empty_or_white_space (string s)
214 for (size_t i = 0; i < s.length(); ++i) {
215 if (s[i] != ' ' && s[i] != '\n' && s[i] != '\t') {
226 if (xmlSecInit() < 0) {
227 throw MiscError ("could not initialise xmlsec");
232 libdcp::add_signature_value (xmlpp::Element* parent, CertificateChain const & certificates, string const & signer_key, string const & ns)
234 parent->add_child("SignatureValue", ns);
236 xmlpp::Element* key_info = parent->add_child("KeyInfo", ns);
237 list<shared_ptr<Certificate> > c = certificates.leaf_to_root ();
238 for (list<shared_ptr<Certificate> >::iterator i = c.begin(); i != c.end(); ++i) {
239 xmlpp::Element* data = key_info->add_child("X509Data", ns);
242 xmlpp::Element* serial = data->add_child("X509IssuerSerial", ns);
243 serial->add_child("X509IssuerName", ns)->add_child_text((*i)->issuer ());
244 serial->add_child("X509SerialNumber", ns)->add_child_text((*i)->serial ());
247 data->add_child("X509Certificate", ns)->add_child_text((*i)->certificate());
250 xmlSecKeysMngrPtr keys_manager = xmlSecKeysMngrCreate();
252 throw MiscError ("could not create keys manager");
255 xmlSecDSigCtx signature_context;
257 if (xmlSecDSigCtxInitialize (&signature_context, keys_manager) < 0) {
258 throw MiscError ("could not initialise XMLSEC context");
261 if (xmlSecDSigCtxSign (&signature_context, parent->cobj()) < 0) {
262 throw MiscError ("could not sign");
265 xmlSecDSigCtxFinalize (&signature_context);
266 xmlSecKeysMngrDestroy (keys_manager);
271 libdcp::add_signer (xmlpp::Element* parent, CertificateChain const & certificates, string const & ns)
273 xmlpp::Element* signer = parent->add_child("Signer");
276 xmlpp::Element* data = signer->add_child("X509Data", ns);
279 xmlpp::Element* serial_element = data->add_child("X509IssuerSerial", ns);
280 serial_element->add_child("X509IssuerName", ns)->add_child_text (certificates.leaf()->issuer());
281 serial_element->add_child("X509SerialNumber", ns)->add_child_text (certificates.leaf()->serial());
284 data->add_child("X509SubjectName", ns)->add_child_text (certificates.leaf()->subject());
289 libdcp::sign (xmlpp::Element* parent, CertificateChain const & certificates, string const & signer_key, bool interop)
291 add_signer (parent, certificates, "dsig");
293 xmlpp::Element* signature = parent->add_child("Signature", "dsig");
296 xmlpp::Element* signed_info = signature->add_child ("SignedInfo", "dsig");
297 signed_info->add_child("CanonicalizationMethod", "dsig")->set_attribute ("Algorithm", "http://www.w3.org/TR/2001/REC-xml-c14n-20010315");
300 signed_info->add_child("SignatureMethod", "dsig")->set_attribute("Algorithm", "http://www.w3.org/2000/09/xmldsig#rsa-sha1");
302 signed_info->add_child("SignatureMethod", "dsig")->set_attribute("Algorithm", "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256");
306 xmlpp::Element* reference = signed_info->add_child("Reference", "dsig");
307 reference->set_attribute ("URI", "");
309 xmlpp::Element* transforms = reference->add_child("Transforms", "dsig");
310 transforms->add_child("Transform", "dsig")->set_attribute (
311 "Algorithm", "http://www.w3.org/2000/09/xmldsig#enveloped-signature"
314 reference->add_child("DigestMethod", "dsig")->set_attribute("Algorithm", "http://www.w3.org/2000/09/xmldsig#sha1");
315 /* This will be filled in by the signing later */
316 reference->add_child("DigestValue", "dsig");
320 add_signature_value (signature, certificates, signer_key, "dsig");
323 bool libdcp::operator== (libdcp::Size const & a, libdcp::Size const & b)
325 return (a.width == b.width && a.height == b.height);
328 bool libdcp::operator!= (libdcp::Size const & a, libdcp::Size const & b)
333 /** The base64 decode routine in KM_util.cpp gives different values to both
334 * this and the command-line base64 for some inputs. Not sure why.
337 libdcp::base64_decode (string const & in, unsigned char* out, int out_length)
339 BIO* b64 = BIO_new (BIO_f_base64 ());
341 /* This means the input should have no newlines */
342 BIO_set_flags (b64, BIO_FLAGS_BASE64_NO_NL);
344 /* Copy our input string, removing newlines */
345 char in_buffer[in.size() + 1];
347 for (size_t i = 0; i < in.size(); ++i) {
348 if (in[i] != '\n' && in[i] != '\r') {
353 BIO* bmem = BIO_new_mem_buf (in_buffer, p - in_buffer);
354 bmem = BIO_push (b64, bmem);
355 int const N = BIO_read (bmem, out, out_length);