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      1 // Copyright 2013 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_BROWSER_MEDIA_WEBRTC_IDENTITY_STORE_BACKEND_H_
      6 #define CONTENT_BROWSER_MEDIA_WEBRTC_IDENTITY_STORE_BACKEND_H_
      7 
      8 #include <map>
      9 #include <string>
     10 
     11 #include "base/time/time.h"
     12 #include "sql/connection.h"
     13 #include "sql/meta_table.h"
     14 
     15 class GURL;
     16 
     17 namespace base {
     18 class FilePath;
     19 }  // namespace base
     20 
     21 namespace quota {
     22 class SpecialStoragePolicy;
     23 }  // namespace quota
     24 
     25 namespace content {
     26 
     27 // This class represents a persistent cache of WebRTC identities.
     28 // It can be created/destroyed/Close() on any thread. All other members should
     29 // be accessed on the IO thread.
     30 class WebRTCIdentityStoreBackend
     31     : public base::RefCountedThreadSafe<WebRTCIdentityStoreBackend> {
     32  public:
     33   typedef base::Callback<void(int error,
     34                               const std::string& certificate,
     35                               const std::string& private_key)>
     36       FindIdentityCallback;
     37 
     38   // No data is saved on disk if |path| is empty.
     39   WebRTCIdentityStoreBackend(const base::FilePath& path,
     40                              quota::SpecialStoragePolicy* policy);
     41 
     42   // Finds the identity with |origin|, |identity_name|, and |common_name| from
     43   // the DB.
     44   // |origin| is the origin of the identity;
     45   // |identity_name| is used to identify an identity within an origin;
     46   // |common_name| is the common name used to generate the certificate;
     47   // |callback| is the callback to return the find result.
     48   // Returns true if |callback| will be called.
     49   // Should be called on the IO thread.
     50   bool FindIdentity(const GURL& origin,
     51                     const std::string& identity_name,
     52                     const std::string& common_name,
     53                     const FindIdentityCallback& callback);
     54 
     55   // Adds the identity to the DB and overwrites any existing identity having the
     56   // same origin and identity_name.
     57   // |origin| is the origin of the identity;
     58   // |identity_name| is used to identify an identity within an origin;
     59   // |common_name| is the common name used to generate the certificate;
     60   // |certificate| is the DER string of the certificate;
     61   // |private_key| is the DER string of the private key.
     62   // Should be called on the IO thread.
     63   void AddIdentity(const GURL& origin,
     64                    const std::string& identity_name,
     65                    const std::string& common_name,
     66                    const std::string& certificate,
     67                    const std::string& private_key);
     68 
     69   // Commits all pending DB operations and closes the DB connection. Any API
     70   // call after this will fail.
     71   // Can be called on any thread.
     72   void Close();
     73 
     74   // Delete the data created between |delete_begin| and |delete_end|.
     75   // Should be called on the IO thread.
     76   void DeleteBetween(base::Time delete_begin,
     77                      base::Time delete_end,
     78                      const base::Closure& callback);
     79 
     80  private:
     81   friend class base::RefCountedThreadSafe<WebRTCIdentityStoreBackend>;
     82   class SqlLiteStorage;
     83   enum LoadingState {
     84     NOT_STARTED,
     85     LOADING,
     86     LOADED,
     87     CLOSED,
     88   };
     89   struct PendingFindRequest;
     90   struct IdentityKey;
     91   struct Identity;
     92   typedef std::map<IdentityKey, Identity> IdentityMap;
     93 
     94   ~WebRTCIdentityStoreBackend();
     95 
     96   void OnLoaded(scoped_ptr<IdentityMap> out_map);
     97 
     98   // In-memory copy of the identities.
     99   IdentityMap identities_;
    100   // "Find identity" requests waiting for the DB to load.
    101   std::vector<PendingFindRequest*> pending_find_requests_;
    102   // The persistent storage loading state.
    103   LoadingState state_;
    104   // The persistent storage of identities.
    105   scoped_refptr<SqlLiteStorage> sql_lite_storage_;
    106 
    107   DISALLOW_COPY_AND_ASSIGN(WebRTCIdentityStoreBackend);
    108 };
    109 }
    110 
    111 #endif  // CONTENT_BROWSER_MEDIA_WEBRTC_IDENTITY_STORE_BACKEND_H_
    112