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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_RENDERER_MEDIA_CDM_RESULT_PROMISE_H_
      6 #define CONTENT_RENDERER_MEDIA_CDM_RESULT_PROMISE_H_
      7 
      8 #include <map>
      9 
     10 #include "base/basictypes.h"
     11 #include "media/base/cdm_promise.h"
     12 #include "third_party/WebKit/public/platform/WebContentDecryptionModuleResult.h"
     13 
     14 namespace content {
     15 
     16 // Used to convert a WebContentDecryptionModuleResult into a CdmPromise so that
     17 // it can be passed through Chromium. When CdmPromise::resolve(T) is called,
     18 // OnResolve(T) will be called and will call the appropriate complete...()
     19 // method on WebContentDecryptionModuleResult. If CdmPromise::reject() is called
     20 // instead, WebContentDecryptionModuleResult::completeWithError() is called.
     21 // If constructed with a |uma_name| (which must be the name of a
     22 // CdmPromiseResult UMA), CdmResultPromise will report the promise result
     23 // (success or rejection code).
     24 template <typename T>
     25 class CdmResultPromise : public media::CdmPromiseTemplate<T> {
     26  public:
     27   explicit CdmResultPromise(
     28       const blink::WebContentDecryptionModuleResult& result);
     29   CdmResultPromise(const blink::WebContentDecryptionModuleResult& result,
     30                    const std::string& uma_name);
     31   virtual ~CdmResultPromise();
     32 
     33  protected:
     34   // OnResolve() is virtual as it may need special handling in derived classes.
     35   virtual void OnResolve(const T& result);
     36   void OnReject(media::MediaKeys::Exception exception_code,
     37                 uint32 system_code,
     38                 const std::string& error_message);
     39 
     40   blink::WebContentDecryptionModuleResult web_cdm_result_;
     41 
     42  private:
     43   DISALLOW_COPY_AND_ASSIGN(CdmResultPromise);
     44 };
     45 
     46 // Specialization for no parameter to resolve().
     47 template <>
     48 class CdmResultPromise<void> : public media::CdmPromiseTemplate<void> {
     49  public:
     50   explicit CdmResultPromise(
     51       const blink::WebContentDecryptionModuleResult& result);
     52   CdmResultPromise(const blink::WebContentDecryptionModuleResult& result,
     53                    const std::string& uma_name);
     54   virtual ~CdmResultPromise();
     55 
     56  protected:
     57   virtual void OnResolve();
     58   void OnReject(media::MediaKeys::Exception exception_code,
     59                 uint32 system_code,
     60                 const std::string& error_message);
     61 
     62   blink::WebContentDecryptionModuleResult web_cdm_result_;
     63 
     64  private:
     65   DISALLOW_COPY_AND_ASSIGN(CdmResultPromise);
     66 };
     67 
     68 typedef CdmResultPromise<void> SimpleCdmResultPromise;
     69 
     70 }  // namespace content
     71 
     72 #endif  // CONTENT_RENDERER_MEDIA_CDM_RESULT_PROMISE_H_
     73