Add an Audiobook navigator based on MediaSession (#155)

r2-shared/src/main/java/org/readium/r2/shared/Experimental.kt

@@ -11,7 +11,7 @@ package org.readium.r2.shared
 
 @RequiresOptIn(message = "Support for PDF is still experimental. The API may be changed in the future without notice.")
 @Retention(AnnotationRetention.BINARY)
-@Target(AnnotationTarget.CLASS, AnnotationTarget.FUNCTION, AnnotationTarget.TYPEALIAS)
+@Target(AnnotationTarget.CLASS, AnnotationTarget.FUNCTION, AnnotationTarget.TYPEALIAS, AnnotationTarget.PROPERTY)
 annotation class PdfSupport
 
 @RequiresOptIn(message = "Support for SearchService is still experimental. The API may be changed in the future without notice.")

r2-shared/src/main/java/org/readium/r2/shared/fetcher/Resource.kt

@@ -141,6 +141,11 @@ interface Resource : SuspendingCloseable {
         class Unavailable(cause: Throwable? = null)
             : Exception(R.string.r2_shared_resource_exception_unavailable, cause)
 
+        /**
+         * The Internet connection appears to be offline.
+         */
+        object Offline : Exception(R.string.r2_shared_resource_exception_offline)
+
         /**
          * Equivalent to a 507 HTTP error.
          *

r2-shared/src/main/java/org/readium/r2/shared/fetcher/ResourceInputStream.kt

@@ -16,8 +16,9 @@ import java.io.InputStream
 /**
  * Input stream reading a [Resource]'s content.
  *
- * The underlying resource will be automatically closed at the same time that this stream is.
- * */
+ * If you experience bad performances, consider wrapping the stream in a BufferedInputStream. This
+ * is particularly useful when streaming deflated ZIP entries.
+ */
 class ResourceInputStream(
     private val resource: Resource,
     val range: LongRange? = null

r2-shared/src/main/java/org/readium/r2/shared/publication/Manifest.kt

@@ -10,6 +10,8 @@
 package org.readium.r2.shared.publication
 
 import android.os.Parcelable
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
 import kotlinx.parcelize.Parcelize
 import org.json.JSONArray
 import org.json.JSONObject
@@ -22,6 +24,7 @@ import org.readium.r2.shared.toJSON
 import org.readium.r2.shared.util.Href
 import org.readium.r2.shared.util.logging.WarningLogger
 import org.readium.r2.shared.util.logging.log
+import java.io.File
 
 /**
  * Holds the metadata of a Readium publication, as described in the Readium Web Publication Manifest.
@@ -75,7 +78,7 @@ data class Manifest(
     companion object {
 
         /**
-         * Parses a [Publication] from its RWPM JSON representation.
+         * Parses a [Manifest] from its RWPM JSON representation.
          *
          * If the publication can't be parsed, a warning will be logged with [warnings].
          * https://readium.org/webpub-manifest/
@@ -106,7 +109,7 @@ data class Manifest(
 
             val metadata = Metadata.fromJSON(json.remove("metadata") as? JSONObject, normalizeHref, warnings)
             if (metadata == null) {
-                warnings?.log(Publication::class.java, "[metadata] is required", json)
+                warnings?.log(Manifest::class.java, "[metadata] is required", json)
                 return null
             }
 

r2-shared/src/main/java/org/readium/r2/shared/publication/Publication.kt

@@ -37,6 +37,16 @@ import kotlin.reflect.KClass
 
 internal typealias ServiceFactory = (Publication.Service.Context) -> Publication.Service?
 
+/**
+ * A reference uniquely identifying a publication in the reading app.
+ *
+ * For example, a database primary key for a local publication, or a source URL for a remote one.
+ *
+ * We can't use publication.metadata.identifier directly because it might be null or not really
+ * unique in the reading app. That's why sometimes we require an ID provided by the app.
+ */
+typealias PublicationId = String
+
 /**
  * The Publication shared model is the entry-point for all the metadata and services
  * related to a Readium publication.

r2-shared/src/main/res/values/strings.xml

@@ -20,6 +20,7 @@
     <string name="r2.shared.resource.exception.not_found">Resource not found</string>
     <string name="r2.shared.resource.exception.forbidden">You are not allowed to access the resource</string>
     <string name="r2.shared.resource.exception.unavailable">The resource is currently unavailable, please try again later</string>
+    <string name="r2_shared_resource_exception_offline">The Internet connection appears to be offline</string>
     <string name="r2.shared.resource.exception.out_of_memory">The resource is too large to be read on this device</string>
     <string name="r2.shared.resource.exception.cancelled">The request was cancelled</string>
     <string name="r2.shared.resource.exception.other">A service error occurred</string>