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1 /* |
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2 * Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of the License "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * Implements some utility functions for reference agent. |
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16 * |
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17 */ |
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18 |
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19 |
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20 #include "srautils.h" |
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21 #include <s32file.h> |
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22 #include <sdpfmtattributefield.h> |
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23 #include <sdpcodecstringpool.h> |
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24 #include <sdpattributefield.h> |
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25 |
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26 HBufC8* ExtractKmsIdLC(const TDesC8& aValue) |
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27 /** |
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28 Searches the given format attribute value for KMS ID. |
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29 @param The format attribute value. |
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30 @return The value of KMS ID, if it exists. Otherwise, NULL. |
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31 */ |
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32 { |
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33 HBufC8* kmsid(0); |
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34 _LIT8(KKmsIdParameter, "IPDCKMSId="); |
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35 |
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36 TLex8 parser(aValue); |
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37 while(!parser.Eos()) |
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38 { |
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39 TPtrC8 token(parser.NextToken()); |
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40 if(token.Find(KKmsIdParameter) == KErrNotFound) continue; |
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41 TLex8 subParser(token); |
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42 while(!subParser.Eos()) |
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43 { |
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44 if(subParser.Get() != '=') continue; |
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45 TPtrC8 value(subParser.NextToken()); |
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46 if(value.Length() == 0) break; |
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47 //Copy the kmsid value to a buffer |
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48 kmsid = HBufC8::NewLC(value.Length()+1); |
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49 TPtr8 ptrBuf(kmsid->Des()); |
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50 ptrBuf.Copy(value); |
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51 //Copy the separator if it does not exist |
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52 _LIT8(KSeparator,";"); |
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53 if(ptrBuf.Find(KSeparator) == KErrNotFound) |
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54 { |
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55 ptrBuf.Append(KSeparator); |
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56 } |
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57 break; |
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58 } |
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59 break; |
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60 } |
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61 return kmsid; |
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62 } |
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63 |
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64 |
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65 EXPORT_C TBool CheckKeyStreamSupportedL(const CSdpMediaField& aSdpKeyStream, const TDesC8& aSupportedKmsIds) |
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66 /** |
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67 Function to determine whether the test stream agent supports the key management scheme |
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68 specified in the SDP key stream definition |
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69 @param aSdpKeyStream Contains the metadata for the SDP key management scheme of the stream |
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70 @param aSupportedKmsIds The list of supported KMS Ids. The delimeter of the list is semi-colon. |
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71 @return ETrue if the test stream agent recognizes the SDP format and the KMS Id is supported. |
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72 @return EFalse if the test stream agent fails to recognize the SDP format or is unable to decode the key stream. |
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73 */ |
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74 { |
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75 //FormatAttributeFields method is not constant. So create a new instance. |
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76 CSdpMediaField* sdp = aSdpKeyStream.CloneL(); |
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77 CleanupStack::PushL(sdp); |
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78 |
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79 TInt attributesCount = sdp->FormatAttributeFields().Count(); |
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80 if (attributesCount <= 0) |
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81 { |
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82 CleanupStack::PopAndDestroy(sdp); |
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83 return EFalse; |
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84 } |
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85 |
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86 TBool supported = EFalse; |
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87 HBufC8* kmsid(0); |
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88 |
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89 for(TInt i=0; i<attributesCount && !supported; ++i) |
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90 { |
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91 if(sdp->FormatAttributeFields()[i]->Format().Compare(_L8("ipdc-ksm"))) continue; |
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92 |
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93 kmsid = ExtractKmsIdLC(sdp->FormatAttributeFields()[i]->Value()); |
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94 if(!kmsid) continue; |
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95 |
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96 if(aSupportedKmsIds.Find(*kmsid) != KErrNotFound) |
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97 { |
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98 supported = ETrue; |
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99 } |
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100 CleanupStack::PopAndDestroy(kmsid); |
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101 } |
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102 CleanupStack::PopAndDestroy(sdp); |
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103 |
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104 return supported; |
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105 } |
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106 |
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107 |
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108 |
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109 void FindAndLoadRightsObjectL(RFs& aFs, const TDesC8& aCid, const TDesC& aPrivateFolder, CSraRightsObject*& aRo) |
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110 /** |
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111 The reference agent keeps rights object files in its own private folder. |
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112 This function scans the private directory and reads RO files in turn. |
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113 If the RO with the given Content ID is found, it's assigned as the session's rights object. |
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114 |
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115 A real-life agent should pre-calculate the map of all supported Rights Object on construction |
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116 and import to avoid costly searches on each opened stream. |
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117 |
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118 @param aFs The file server handle. |
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119 @param aCid The searched Content Id. |
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120 @param aPrivateFolder The private folder of the agent. |
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121 @param aRo Rights Object which is found in the private folder of the agent. |
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122 */ |
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123 { |
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124 ASSERT(!aRo); |
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125 TFileName privFolder(aPrivateFolder); |
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126 privFolder[0] = aFs.GetSystemDriveChar(); |
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127 privFolder.Append(_L("*.dr")); |
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128 |
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129 CDir *entryList; |
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130 User::LeaveIfError(aFs.GetDir(privFolder,KEntryAttNormal,ESortByName|EDescending|EDirsLast,entryList)); |
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131 CleanupStack::PushL(entryList); |
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132 privFolder.SetLength(privFolder.Length()-4); |
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133 |
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134 TInt count = entryList->Count(); |
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135 TInt i = 0; |
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136 TFileName filePath; |
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137 RFile fRo; |
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138 RFileReadStream stream; |
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139 CSraRightsObject* ro = NULL; |
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140 for(i=0; i<count; ++i) |
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141 { |
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142 if((*entryList)[i].IsDir()) continue; |
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143 |
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144 filePath.Copy(privFolder); |
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145 filePath.Append((*entryList)[i].iName); |
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146 User::LeaveIfError(fRo.Open(aFs, filePath, EFileRead | EFileShareReadersOnly)); |
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147 CleanupClosePushL(fRo); |
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148 stream.Attach(fRo); |
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149 CleanupClosePushL(stream); |
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150 ro = CSraRightsObject::NewL(stream); |
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151 CleanupStack::PushL(ro); |
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152 if(aCid.Compare(ro->ContentId()->Des()) == 0) |
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153 { |
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154 CleanupStack::Pop(ro); |
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155 aRo = ro; |
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156 CleanupStack::PopAndDestroy(2, &fRo); |
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157 break; |
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158 } |
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159 else |
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160 { |
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161 CleanupStack::PopAndDestroy(3, &fRo); |
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162 }//if |
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163 }//for |
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164 CleanupStack::PopAndDestroy(entryList); |
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165 } |
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166 |
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167 EXPORT_C void DoSetRightsObjectL(RFs& aFs, CSdpMediaField& aSdp, CSraRightsObject*& aRo, const TDesC& aPrivateFolder) |
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168 /** |
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169 Finds and loads the Rights Object specified in the SDP given. |
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170 */ |
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171 { |
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172 // Find the rights object if it is defined in the SDP |
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173 CSdpAttributeField* roAttrField = NULL; |
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174 TInt count = aSdp.AttributeFields().Count(); |
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175 if(count <= 0) |
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176 { |
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177 // No rights object is defined in the SDP. |
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178 // The agent cannot service without any rights object. |
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179 User::Leave(KErrNotSupported); |
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180 } |
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181 |
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182 // The content Id of the rights object is defined with the following string. |
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183 _LIT8(KSdpAttributeRightsObject,"baseCID"); |
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184 RStringPool pool = SdpCodecStringPool::StringPoolL(); |
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185 // Create a string for the content id by using the current string pool. |
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186 RStringF roAttribute = pool.OpenFStringL(KSdpAttributeRightsObject); |
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187 CleanupClosePushL(roAttribute); |
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188 |
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189 TInt i = 0; |
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190 for(i=0; i<count; ++i) |
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191 { |
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192 if((aSdp.AttributeFields()[i]->Attribute()) == roAttribute) |
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193 { |
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194 // The attribute of the content id has been found. |
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195 roAttrField = aSdp.AttributeFields()[i]; |
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196 break; |
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197 }//if |
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198 }//for |
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199 CleanupStack::PopAndDestroy(&roAttribute); |
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200 |
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201 if(roAttrField) |
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202 {//the rights object is defined in the SDP |
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203 FindAndLoadRightsObjectL(aFs, roAttrField->Value(), aPrivateFolder, aRo); |
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204 } |
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205 } |
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206 |
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207 EXPORT_C void DoSetSdpMediaFieldL(RFs& aFs, CSdpMediaField*& aSdp, CSraRightsObject*& aRo, const TDesC8& aSdpData, const TDesC& aPrivateFolder) |
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208 /** |
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209 Generates a Service Description Protocol (SDP) object from the given SDP data. |
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210 |
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211 @param aFs The file server handle. |
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212 @param aSdp The session description protocol object generated by this function. |
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213 @param aRo Rights Object which is found in the private folder of the agent. |
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214 @param aSdpData The SDP data sent by the client. |
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215 @param aPrivateFolder The private folder of the agent. |
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216 */ |
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217 { |
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218 ASSERT(!aSdp); |
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219 // Decode the received message into an SDP object |
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220 aSdp = CSdpMediaField::DecodeL(aSdpData,ETrue); |
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221 // Set the specified RO |
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222 DoSetRightsObjectL(aFs, *aSdp, aRo, aPrivateFolder); |
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223 } |