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Refactoring to cache service certs and initialization data

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* Extend CdmLicense's stored_init_data_

  [ Merge of http://go/wvgerrit/14661 ]

  CdmLicense will store init data when a server cert must be
  provisioned.  After provisioning, the original init data can be used
  to generate the originally-intended license request.

  To do this before, the caller had to call CdmSession's
  GenerateKeyRequest with an empty InitializationData object.  However,
  the init data's type still had to be set, as did the license type.

  This CL allows the caller to use a truly empty InitializationData
  without a type.  To permit this, CdmLicense now stores a full
  InitializationData object, rather than just a copy of it's data field.

  With this CL, the caller also avoid storing the original license type.
  To accomplish this, CdmSession uses the already-set is_offline_ and
  is_release_ flags from the original call to reconstruct the intended
  license type.  The caller uses the new type kLicenseTypeDeferred.

  To facilitate storing whole InitializationData objects, they are now
  copyable.

  This ultimately simplifies server cert code for the new CE CDM.

* Store service certs in Properties

  [ Merge of http://go/wvgerrit/14664 ]

  This allows CE devices to mimic the Chrome CDM's behavior of sharing
  server certs between sessions.

  This also affects Android behavior.  Previously, provisioned service
  certificates were per-session, while explicitly-set service certs
  were per-DRM-plugin.  Now, both are per-DRM-plugin.

  A DRM plugin is associated with a mediaDrm object. Content
  providers will still be able to retrieve and use different
  certificates. The change here requires an app, that wishes to use
  different provisioned service certificates will have to use
  multiple mediaDrm objects. This is an unlikely scenario.

Change-Id: If2586932784ed046ecab72b5720ff30547e84b97
This commit is contained in:
Rahul Frias
2015-09-30 09:48:07 -07:00
parent 9dd196e0ec
commit 85da7bdb98
19 changed files with 162 additions and 104 deletions
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51
libwvdrmengine/cdm/core/src/cdm_session.cpp
View File

@@ -2,7 +2,9 @@
#include "cdm_session.h"
#include <assert.h>
#include <stdlib.h>
#include <iostream>
#include <sstream>
@@ -23,14 +25,13 @@ const size_t kKeySetIdLength = 14;
namespace wvcdm {
CdmSession::CdmSession(const CdmClientPropertySet* cdm_client_property_set,
CdmSession::CdmSession(CdmClientPropertySet* cdm_client_property_set,
const std::string& origin,
WvCdmEventListener* event_listener,
const CdmSessionId* forced_session_id)
: initialized_(false),
session_id_(GenerateSessionId()),
origin_(origin),
license_parser_(new CdmLicense),
crypto_session_(new CryptoSession),
file_handle_(new DeviceFiles),
license_received_(false),
@@ -51,6 +52,7 @@ CdmSession::CdmSession(const CdmClientPropertySet* cdm_client_property_set,
}
session_id_ = key_set_id_;
}
license_parser_.reset(new CdmLicense(session_id_));
policy_engine_.reset(new PolicyEngine(
session_id_, event_listener, crypto_session_.get()));
if (cdm_client_property_set) {
@@ -166,7 +168,7 @@ CdmResponseType CdmSession::RestoreUsageSession(
}
CdmResponseType CdmSession::GenerateKeyRequest(
const InitializationData& init_data, const CdmLicenseType license_type,
const InitializationData& init_data, CdmLicenseType license_type,
const CdmAppParameterMap& app_parameters, CdmKeyMessage* key_request,
CdmKeyRequestType* key_request_type, std::string* server_url,
CdmKeySetId* key_set_id) {
@@ -190,6 +192,24 @@ CdmResponseType CdmSession::GenerateKeyRequest(
case kLicenseTypeRelease:
is_release_ = true;
break;
case kLicenseTypeDeferred:
// If you're going to pass Deferred, you must have empty init data in
// this call and stored init data from the previous call.
if (!init_data.IsEmpty() || !license_parser_->HasInitData()) {
return INVALID_LICENSE_TYPE;
}
// The arguments check out.
// The is_release_ and is_offline_ flags were already set last time based
// on the original license type. Do not change them, and use them to
// re-derive the original license type.
if (is_release_) {
license_type = kLicenseTypeRelease;
} else if (is_offline_) {
license_type = kLicenseTypeOffline;
} else {
license_type = kLicenseTypeStreaming;
}
break;
default:
LOGE("CdmSession::GenerateKeyRequest: unrecognized license type: %ld",
license_type);
@@ -204,14 +224,16 @@ CdmResponseType CdmSession::GenerateKeyRequest(
return GenerateRenewalRequest(key_request, server_url);
} else {
if (key_request_type) *key_request_type = kKeyRequestTypeInitial;
if (!init_data.is_supported()) {
LOGW("CdmSession::GenerateKeyRequest: unsupported init data type (%s)",
init_data.type().c_str());
return UNSUPPORTED_INIT_DATA;
}
if (init_data.IsEmpty() && !license_parser_->HasInitData()) {
LOGW("CdmSession::GenerateKeyRequest: init data absent");
return INIT_DATA_NOT_FOUND;
if (!license_parser_->HasInitData()) {
if (!init_data.is_supported()) {
LOGW("CdmSession::GenerateKeyRequest: unsupported init data type (%s)",
init_data.type().c_str());
return UNSUPPORTED_INIT_DATA;
}
if (init_data.IsEmpty()) {
LOGW("CdmSession::GenerateKeyRequest: init data absent");
return INIT_DATA_NOT_FOUND;
}
}
if (is_offline_ && key_set_id_.empty() &&
!GenerateKeySetId(&key_set_id_)) {
@@ -222,8 +244,7 @@ CdmResponseType CdmSession::GenerateKeyRequest(
app_parameters_ = app_parameters;
CdmResponseType status = license_parser_->PrepareKeyRequest(
init_data, license_type,
app_parameters, session_id_,
key_request, server_url);
app_parameters, key_request, server_url);
if (KEY_MESSAGE != status) return status;
@@ -374,7 +395,7 @@ CdmResponseType CdmSession::Decrypt(const CdmDecryptionParameters& params) {
CdmResponseType CdmSession::GenerateRenewalRequest(CdmKeyMessage* key_request,
std::string* server_url) {
CdmResponseType status = license_parser_->PrepareKeyUpdateRequest(
true, app_parameters_, session_id_, key_request, server_url);
true, app_parameters_, key_request, server_url);
if (KEY_MESSAGE != status) return status;
@@ -402,7 +423,7 @@ CdmResponseType CdmSession::GenerateReleaseRequest(CdmKeyMessage* key_request,
std::string* server_url) {
is_release_ = true;
CdmResponseType status = license_parser_->PrepareKeyUpdateRequest(
false, app_parameters_, session_id_, key_request, server_url);
false, app_parameters_, key_request, server_url);
if (KEY_MESSAGE != status) return status;