Allow to bypass the selection protection with LCP (#303)

Author: mickael-menu

readium/navigator/src/main/java/org/readium/r2/navigator/epub/EpubNavigatorFragment.kt

@@ -41,7 +41,17 @@ import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
 import org.json.JSONObject
-import org.readium.r2.navigator.*
+import org.readium.r2.navigator.DecorableNavigator
+import org.readium.r2.navigator.Decoration
+import org.readium.r2.navigator.DecorationId
+import org.readium.r2.navigator.ExperimentalDecorator
+import org.readium.r2.navigator.ExperimentalDragGesture
+import org.readium.r2.navigator.NavigatorDelegate
+import org.readium.r2.navigator.R
+import org.readium.r2.navigator.R2BasicWebView
+import org.readium.r2.navigator.SelectableNavigator
+import org.readium.r2.navigator.Selection
+import org.readium.r2.navigator.VisualNavigator
 import org.readium.r2.navigator.databinding.ActivityR2ViewpagerBinding
 import org.readium.r2.navigator.epub.EpubNavigatorViewModel.RunScriptCommand
 import org.readium.r2.navigator.epub.css.FontFamilyDeclaration
@@ -59,6 +69,7 @@ import org.readium.r2.navigator.preferences.Configurable
 import org.readium.r2.navigator.preferences.FontFamily
 import org.readium.r2.navigator.preferences.ReadingProgression
 import org.readium.r2.navigator.util.createFragmentFactory
+import org.readium.r2.shared.DelicateReadiumApi
 import org.readium.r2.shared.ExperimentalReadiumApi
 import org.readium.r2.shared.extensions.tryOrLog
 import org.readium.r2.shared.fetcher.Resource
@@ -154,7 +165,18 @@ class EpubNavigatorFragment internal constructor(
          */
         val shouldApplyInsetsPadding: Boolean? = true,
 
-        internal val javascriptInterfaces: MutableMap<String, JavascriptInterfaceFactory> = mutableMapOf()
+        internal val javascriptInterfaces: MutableMap<String, JavascriptInterfaceFactory> = mutableMapOf(),
+
+        /**
+         * Disable user selection if the publication is protected by a DRM (e.g. with LCP).
+         *
+         * WARNING: If you choose to disable this, you MUST remove the Copy and Share selection
+         * menu items in your app. Otherwise, you will void the EDRLab certification for your
+         * application. If you need help, follow up on:
+         * https://github.com/readium/kotlin-toolkit/issues/299#issuecomment-1315643577
+         */
+        @DelicateReadiumApi
+        val disableSelectionWhenProtected: Boolean = true
     ) {
         /**
          * Registers a new factory for the [JavascriptInterface] named [name].

readium/navigator/src/main/java/org/readium/r2/navigator/epub/EpubNavigatorViewModel.kt

@@ -390,7 +390,11 @@ internal class EpubNavigatorViewModel(
                 defaults = defaults,
                 baseUrl = baseUrl,
                 server = if (baseUrl != null) null
-                else WebViewServer(application, publication, servedAssets = config.servedAssets)
+                else WebViewServer(
+                    application, publication,
+                    servedAssets = config.servedAssets,
+                    disableSelectionWhenProtected = config.disableSelectionWhenProtected
+                )
             )
         }
     }

readium/navigator/src/main/java/org/readium/r2/navigator/epub/HtmlInjector.kt

@@ -22,7 +22,12 @@ import timber.log.Timber
  * @param baseHref Base URL where the Readium CSS and scripts are served.
  */
 @OptIn(ExperimentalReadiumApi::class)
-internal fun Resource.injectHtml(publication: Publication, css: ReadiumCss, baseHref: String): Resource =
+internal fun Resource.injectHtml(
+    publication: Publication,
+    css: ReadiumCss,
+    baseHref: String,
+    disableSelectionWhenProtected: Boolean
+): Resource =
     TransformingResource(this) { bytes ->
         val link = link()
         check(link.mediaType.isHtml)
@@ -40,7 +45,7 @@ internal fun Resource.injectHtml(publication: Publication, css: ReadiumCss, base
 
         // Disable the text selection if the publication is protected.
         // FIXME: This is a hack until proper LCP copy is implemented, see https://github.com/readium/kotlin-toolkit/issues/221
-        if (publication.isProtected) {
+        if (disableSelectionWhenProtected && publication.isProtected) {
             injectables.add(
                 """
                 <style>

readium/navigator/src/main/java/org/readium/r2/navigator/epub/WebViewServer.kt

@@ -35,6 +35,7 @@ internal class WebViewServer(
     private val application: Application,
     private val publication: Publication,
     servedAssets: List<String>,
+    private val disableSelectionWhenProtected: Boolean
 ) {
     companion object {
         val publicationBaseHref = "https://readium/publication/"
@@ -85,7 +86,11 @@ internal class WebViewServer(
         var resource = publication.get(link)
             .fallback { errorResource(link, error = it) }
         if (link.mediaType.isHtml) {
-            resource = resource.injectHtml(publication, css, baseHref = assetsBaseHref)
+            resource = resource.injectHtml(
+                publication, css,
+                baseHref = assetsBaseHref,
+                disableSelectionWhenProtected = disableSelectionWhenProtected
+            )
         }
 
         val headers = mutableMapOf(