238 lines
9.2 KiB
C++
238 lines
9.2 KiB
C++
// Copyright 2017 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#include "packager/media/base/playready_key_source.h"
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#include <algorithm>
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#include "packager/base/base64.h"
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#include "packager/base/logging.h"
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#include "packager/base/strings/string_number_conversions.h"
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#include "packager/base/strings/string_util.h"
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#include "packager/media/base/buffer_writer.h"
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#include "packager/media/base/http_key_fetcher.h"
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#include "packager/media/base/key_source.h"
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#include "packager/media/base/protection_system_ids.h"
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#include "packager/status_macros.h"
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namespace shaka {
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namespace media {
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namespace {
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const uint32_t kHttpFetchTimeout = 60; // In seconds
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const std::string kAcquireLicenseRequest =
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"<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
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"<soap:Envelope xmlns=\"http://schemas.xmlsoap.org/soap/envelope/\" "
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"xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" "
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"xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" "
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"xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"
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"<soap:Body>"
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"<AcquirePackagingData "
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"xmlns=\"http://schemas.microsoft.com/DRM/2007/03/protocols\">"
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"<challenge "
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"xmlns=\"http://schemas.microsoft.com/DRM"
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"/2007/03/protocols/AcquirePackagingData/v1.0\">"
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"<ProtectionSystems>"
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"<ProtectionSystemId>9A04F079-9840-4286-AB92-E65BE0885F95"
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"</ProtectionSystemId>"
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"</ProtectionSystems>"
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"<StreamProtectionRequests>"
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"<StreamInformation>"
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"<ProgramIdentifier>$0</ProgramIdentifier>"
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"<OffsetFromProgramStart>P0S</OffsetFromProgramStart>"
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"</StreamInformation>"
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"</StreamProtectionRequests>"
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"</challenge>"
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"</AcquirePackagingData>"
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"</soap:Body>"
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"</soap:Envelope>";
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bool Base64StringToBytes(const std::string& base64_string,
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std::vector<uint8_t>* bytes) {
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DCHECK(bytes);
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std::string str;
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if (!base::Base64Decode(base64_string, &str))
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return false;
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bytes->assign(str.begin(), str.end());
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return true;
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}
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}
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PlayReadyKeySource::PlayReadyKeySource(const std::string& server_url,
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int protection_system_flags,
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FourCC protection_scheme)
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// PlayReady PSSH is retrived from PlayReady server response.
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: KeySource(protection_system_flags & ~PLAYREADY_PROTECTION_SYSTEM_FLAG,
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protection_scheme),
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generate_playready_protection_system_(
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// Generate PlayReady protection system if there are no other
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// protection system specified.
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protection_system_flags == NO_PROTECTION_SYSTEM_FLAG ||
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protection_system_flags & PLAYREADY_PROTECTION_SYSTEM_FLAG),
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encryption_key_(new EncryptionKey),
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server_url_(server_url) {}
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PlayReadyKeySource::PlayReadyKeySource(
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const std::string& server_url,
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const std::string& client_cert_file,
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const std::string& client_cert_private_key_file,
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const std::string& client_cert_private_key_password,
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int protection_system_flags,
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FourCC protection_scheme)
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// PlayReady PSSH is retrived from PlayReady server response.
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: KeySource(protection_system_flags & ~PLAYREADY_PROTECTION_SYSTEM_FLAG,
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protection_scheme),
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encryption_key_(new EncryptionKey),
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server_url_(server_url),
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client_cert_file_(client_cert_file),
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client_cert_private_key_file_(client_cert_private_key_file),
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client_cert_private_key_password_(client_cert_private_key_password) {}
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PlayReadyKeySource::~PlayReadyKeySource() = default;
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Status RetrieveTextInXMLElement(const std::string& element,
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const std::string& xml,
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std::string* value) {
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std::string start_tag = "<" + element + ">";
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std::string end_tag = "</" + element + ">";
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std::size_t start_pos = xml.find(start_tag);
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if (start_pos == std::string::npos) {
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return Status(error::SERVER_ERROR,
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"Unable to find tag: " + start_tag);
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}
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start_pos += start_tag.size();
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std::size_t end_pos = xml.find(end_tag);
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if (end_pos == std::string::npos) {
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return Status(error::SERVER_ERROR,
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"Unable to find tag: " + end_tag);
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}
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if (start_pos > end_pos) {
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return Status(error::SERVER_ERROR, "Invalid positions");
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}
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std::size_t segment_len = end_pos - start_pos;
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*value = xml.substr(start_pos, segment_len);
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return Status::OK;
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}
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Status SetKeyInformationFromServerResponse(
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const std::string& response,
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bool generate_playready_protection_system,
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EncryptionKey* encryption_key) {
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// TODO(robinconnell): Currently all tracks are encrypted using the same
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// key_id and key. Add the ability to retrieve multiple key_id/keys from
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// the packager response and encrypt multiple tracks using differnt
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// key_id/keys.
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std::string key_id_hex;
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RETURN_IF_ERROR(RetrieveTextInXMLElement("KeyId", response, &key_id_hex));
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key_id_hex.erase(
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std::remove(key_id_hex.begin(), key_id_hex.end(), '-'), key_id_hex.end());
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if (!base::HexStringToBytes(key_id_hex, &encryption_key->key_id)) {
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LOG(ERROR) << "Cannot parse key_id_hex, " << key_id_hex;
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return Status(error::SERVER_ERROR, "Cannot parse key_id_hex.");
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}
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std::string key_data_b64;
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RETURN_IF_ERROR(RetrieveTextInXMLElement("KeyData", response, &key_data_b64));
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if (!Base64StringToBytes(key_data_b64, &encryption_key->key)) {
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LOG(ERROR) << "Cannot parse key, " << key_data_b64;
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return Status(error::SERVER_ERROR, "Cannot parse key.");
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}
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if (generate_playready_protection_system) {
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std::string pssh_data_b64;
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RETURN_IF_ERROR(RetrieveTextInXMLElement("Data", response, &pssh_data_b64));
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std::vector<uint8_t> pssh_data;
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if (!Base64StringToBytes(pssh_data_b64, &pssh_data)) {
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LOG(ERROR) << "Cannot parse pssh data, " << pssh_data_b64;
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return Status(error::SERVER_ERROR, "Cannot parse pssh.");
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}
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PsshBoxBuilder pssh_builder;
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pssh_builder.add_key_id(encryption_key->key_id);
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pssh_builder.set_system_id(kPlayReadySystemId,
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arraysize(kPlayReadySystemId));
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pssh_builder.set_pssh_data(pssh_data);
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encryption_key->key_system_info.push_back(
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{pssh_builder.system_id(), pssh_builder.CreateBox()});
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}
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return Status::OK;
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}
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Status PlayReadyKeySource::FetchKeysWithProgramIdentifier(
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const std::string& program_identifier) {
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std::unique_ptr<EncryptionKey> encryption_key(new EncryptionKey);
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HttpKeyFetcher key_fetcher(kHttpFetchTimeout);
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if (!client_cert_file_.empty() && !client_cert_private_key_file_.empty()) {
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key_fetcher.SetClientCertInfo(client_cert_file_,
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client_cert_private_key_file_,
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client_cert_private_key_password_);
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}
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if (!ca_file_.empty()) {
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key_fetcher.SetCaFile(ca_file_);
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}
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std::string acquire_license_request = kAcquireLicenseRequest;
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base::ReplaceFirstSubstringAfterOffset(
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&acquire_license_request, 0, "$0", program_identifier);
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std::string acquire_license_response;
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Status status = key_fetcher.FetchKeys(server_url_, acquire_license_request,
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&acquire_license_response);
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VLOG(1) << "Server response: " << acquire_license_response;
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RETURN_IF_ERROR(status);
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RETURN_IF_ERROR(SetKeyInformationFromServerResponse(
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acquire_license_response, generate_playready_protection_system_,
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encryption_key.get()));
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// PlayReady does not specify different streams.
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const char kEmptyDrmLabel[] = "";
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EncryptionKeyMap encryption_key_map;
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encryption_key_map[kEmptyDrmLabel] = std::move(encryption_key);
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RETURN_IF_ERROR(UpdateProtectionSystemInfo(&encryption_key_map));
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encryption_key_ = std::move(encryption_key_map[kEmptyDrmLabel]);
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return Status::OK;
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}
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Status PlayReadyKeySource::FetchKeys(EmeInitDataType init_data_type,
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const std::vector<uint8_t>& init_data) {
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// Do nothing for PlayReady encryption/decryption.
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return Status::OK;
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}
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Status PlayReadyKeySource::GetKey(const std::string& stream_label,
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EncryptionKey* key) {
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// TODO(robinconnell): Currently all tracks are encrypted using the same
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// key_id and key. Add the ability to encrypt each stream_label using a
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// different key_id and key.
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DCHECK(key);
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DCHECK(encryption_key_);
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*key = *encryption_key_;
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return Status::OK;
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}
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Status PlayReadyKeySource::GetKey(const std::vector<uint8_t>& key_id,
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EncryptionKey* key) {
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// TODO(robinconnell): Currently all tracks are encrypted using the same
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// key_id and key. Add the ability to encrypt using multiple key_id/keys.
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DCHECK(key);
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DCHECK(encryption_key_);
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*key = *encryption_key_;
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return Status::OK;
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}
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Status PlayReadyKeySource::GetCryptoPeriodKey(uint32_t crypto_period_index,
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uint32_t crypto_period_duration_in_seconds,
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const std::string& stream_label,
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EncryptionKey* key) {
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// TODO(robinconnell): Implement key rotation.
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*key = *encryption_key_;
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return Status::OK;
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}
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} // namespace media
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} // namespace shaka
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