With option for associating image with wikipedia article (#3783)

app/src/main/java/fr/free/nrw/commons/media/MediaClient.java

@@ -28,6 +28,7 @@ import timber.log.Timber;
 public class MediaClient {
 
     private final MediaInterface mediaInterface;
+    private final PageMediaInterface pageMediaInterface;
     private final MediaDetailInterface mediaDetailInterface;
 
     //OkHttpJsonApiClient used JsonKvStore for this. I don't know why.
@@ -37,8 +38,11 @@ public class MediaClient {
     private static final String NO_DEPICTION = "No depiction";
 
     @Inject
-    public MediaClient(MediaInterface mediaInterface, MediaDetailInterface mediaDetailInterface) {
+    public MediaClient(MediaInterface mediaInterface,
+        PageMediaInterface pageMediaInterface,
+        MediaDetailInterface mediaDetailInterface) {
         this.mediaInterface = mediaInterface;
+        this.pageMediaInterface = pageMediaInterface;
         this.mediaDetailInterface = mediaDetailInterface;
         this.continuationStore = new HashMap<>();
         this.continuationExists = new HashMap<>();
@@ -222,6 +226,13 @@ public class MediaClient {
                 .singleOrError();
     }
 
+    public Single<Boolean> doesPageContainMedia(String title) {
+        return pageMediaInterface.getMediaList(title)
+            .map(pageMediaListResponse -> {
+                return pageMediaListResponse.getItems().size() > 0;
+            }).singleOrError();
+    }
+
     private boolean isSuccess(Entities response) {
         return response != null && response.getSuccess() == 1 && response.entities() != null;
     }

app/src/main/java/fr/free/nrw/commons/media/PageMediaInterface.kt

@@ -0,0 +1,19 @@
+package fr.free.nrw.commons.media
+
+import fr.free.nrw.commons.media.model.PageMediaListResponse
+import io.reactivex.Observable
+import retrofit2.http.GET
+import retrofit2.http.Path
+
+/**
+ * Interface for MediaWiki Page REST APIs
+ */
+interface PageMediaInterface {
+    /**
+     * Get a list of media used on a page
+     *
+     * @param title the title of the page
+     */
+    @GET("api/rest_v1/page/media-list/{title}")
+    fun getMediaList(@Path("title") title: String?): Observable<PageMediaListResponse?>?
+}

app/src/main/java/fr/free/nrw/commons/media/model/PageMediaListResponse.kt

@@ -0,0 +1,9 @@
+package fr.free.nrw.commons.media.model
+
+data class PageMediaListResponse(
+    val revision: String,
+    val tid: String,
+    val items: List<PageMediaListItem>
+)
+
+data class PageMediaListItem(val title: String)