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Merge pull request #87 from qnga/lcpclient
Remove dependency to liblcp by reflection
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107 changes: 107 additions & 0 deletions
107
r2-lcp/src/main/java/org/readium/r2/lcp/service/LcpClient.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| package org.readium.r2.lcp.service | ||
|
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| import org.readium.r2.lcp.LcpException | ||
| import org.readium.r2.shared.extensions.tryOr | ||
| import java.lang.reflect.InvocationTargetException | ||
|
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| internal object LcpClient { | ||
|
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| data class Context( | ||
| val hashedPassphrase: String, | ||
| val encryptedContentKey: String, | ||
| val token: String, | ||
| val profile: String | ||
| ) { | ||
| companion object { | ||
|
|
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| fun fromDRMContext(drmContext: Any): Context = | ||
| with(Class.forName("org.readium.lcp.sdk.DRMContext")) { | ||
| val encryptedContentKey = getMethod("getEncryptedContentKey").invoke(drmContext) as String | ||
| val hashedPassphrase = getMethod("getHashedPassphrase").invoke(drmContext) as String | ||
| val profile = getMethod("getProfile").invoke(drmContext) as String | ||
| val token = getMethod("getToken").invoke(drmContext) as String | ||
| Context(hashedPassphrase, encryptedContentKey, token, profile) | ||
| } | ||
| } | ||
|
|
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| fun toDRMContext(): Any = | ||
| Class.forName("org.readium.lcp.sdk.DRMContext") | ||
| .getConstructor(String::class.java, String::class.java, String::class.java, String::class.java) | ||
| .newInstance(hashedPassphrase, encryptedContentKey, token, profile) | ||
| } | ||
|
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| private val instance: Any by lazy { | ||
| klass.newInstance() | ||
| } | ||
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| private val klass: Class<*> by lazy { | ||
| Class.forName("org.readium.lcp.sdk.Lcp") | ||
| } | ||
|
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| fun isAvailable(): Boolean = tryOr(false) { | ||
| instance | ||
| true | ||
| } | ||
|
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| fun createContext(jsonLicense: String, hashedPassphrases: String, pemCrl: String): Context = | ||
| try { | ||
| val drmContext = klass | ||
| .getMethod("createContext", String::class.java, String::class.java, String::class.java) | ||
| .invoke(instance, jsonLicense, hashedPassphrases, pemCrl)!! | ||
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| Context.fromDRMContext(drmContext) | ||
| } catch (e: InvocationTargetException) { | ||
| throw mapException(e.targetException) | ||
| } | ||
|
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| fun decrypt(context: Context, encryptedData: ByteArray): ByteArray = | ||
| try { | ||
| klass | ||
| .getMethod("decrypt", Class.forName("org.readium.lcp.sdk.DRMContext"), ByteArray::class.java) | ||
| .invoke(instance, context.toDRMContext(), encryptedData) | ||
| as ByteArray | ||
| } catch (e: InvocationTargetException) { | ||
| throw mapException(e.targetException) | ||
| } | ||
|
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| fun findOneValidPassphrase(jsonLicense: String, hashedPassphrases: List<String>): String = | ||
| try { | ||
| klass | ||
| .getMethod("findOneValidPassphrase", String::class.java, Array<String>::class.java) | ||
| .invoke(instance, jsonLicense, hashedPassphrases.toTypedArray()) as String | ||
| } catch (e: InvocationTargetException) { | ||
| throw mapException(e.targetException) | ||
| } | ||
|
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| private fun mapException(e: Throwable): LcpException { | ||
|
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| val drmExceptionClass = Class.forName("org.readium.lcp.sdk.DRMException") | ||
|
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| if (!drmExceptionClass.isInstance(e)) | ||
| return LcpException.Runtime("the Lcp client threw an unhandled exception") | ||
|
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| val drmError = drmExceptionClass | ||
| .getMethod("getDrmError") | ||
| .invoke(e) | ||
|
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| val errorCode = Class | ||
| .forName("org.readium.lcp.sdk.DRMError") | ||
| .getMethod("getCode") | ||
| .invoke(drmError) as Int | ||
|
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| return when (errorCode) { | ||
| // Error code 11 should never occur since we check the start/end date before calling createContext | ||
| 11 -> LcpException.Runtime("License is out of date (check start and end date).") | ||
| 101 -> LcpException.LicenseIntegrity.CertificateRevoked | ||
| 102 -> LcpException.LicenseIntegrity.CertificateSignatureInvalid | ||
| 111 -> LcpException.LicenseIntegrity.LicenseSignatureDateInvalid | ||
| 112 -> LcpException.LicenseIntegrity.LicenseSignatureInvalid | ||
| // Error code 121 seems to be unused in the C++ lib. | ||
| 121 -> LcpException.Runtime("The drm context is invalid.") | ||
| 131 -> LcpException.Decryption.ContentKeyDecryptError | ||
| 141 -> LcpException.LicenseIntegrity.UserKeyCheckInvalid | ||
| 151 -> LcpException.Decryption.ContentDecryptError | ||
| else -> LcpException.Unknown(e) | ||
| } | ||
| } | ||
| } |
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