Ability to Remove Subreddit from Multireddit

src/main/java/org/quantumbadger/redreader/activities/ImageViewActivity.java

@@ -889,6 +889,7 @@ private void makeCacheRequest(
 				DownloadStrategyIfNotCached.INSTANCE,
 				Constants.FileType.IMAGE,
 				CacheRequest.DownloadQueueType.IMMEDIATE,
+				CacheRequest.RequestMethod.GET,
 				this,
 				new CacheRequestCallbacks() {
 
@@ -979,6 +980,7 @@ public void onDataStreamAvailable(
 					DownloadStrategyIfNotCached.INSTANCE,
 					Constants.FileType.IMAGE,
 					CacheRequest.DownloadQueueType.IMMEDIATE,
+					CacheRequest.RequestMethod.GET,
 					this,
 					new CacheRequestCallbacks() {
 						@Override

src/main/java/org/quantumbadger/redreader/activities/ImgurUploadActivity.java

@@ -285,6 +285,7 @@ private void uploadImage() {
 				DownloadStrategyAlways.INSTANCE,
 				Constants.FileType.NOCACHE,
 				CacheRequest.DownloadQueueType.IMGUR_API,
+				CacheRequest.RequestMethod.POST,
 				new HTTPRequestBody.Multipart()
 						.addPart(new Part.FormDataBinary("image", mImageData)),
 				this,

src/main/java/org/quantumbadger/redreader/activities/InboxListingActivity.java

@@ -262,6 +262,7 @@ private void makeFirstRequest(final Context context) {
 				DownloadStrategyAlways.INSTANCE,
 				Constants.FileType.INBOX_LIST,
 				CacheRequest.DownloadQueueType.REDDIT_API,
+				CacheRequest.RequestMethod.GET,
 				false,
 				context,
 				new CacheRequestCallbacks() {

src/main/java/org/quantumbadger/redreader/adapters/MainMenuListingManager.java

@@ -51,6 +51,7 @@
 import org.quantumbadger.redreader.fragments.MainMenuFragment;
 import org.quantumbadger.redreader.receivers.announcements.Announcement;
 import org.quantumbadger.redreader.receivers.announcements.AnnouncementDownloader;
+import org.quantumbadger.redreader.reddit.api.RedditAPIMultiredditAction;
 import org.quantumbadger.redreader.reddit.api.RedditSubredditSubscriptionManager;
 import org.quantumbadger.redreader.reddit.api.SubredditSubscriptionState;
 import org.quantumbadger.redreader.reddit.things.SubredditCanonicalId;
@@ -951,13 +952,18 @@ private GroupedRecyclerViewItemListItemView makeMultiredditItem(
 		final View.OnClickListener clickListener = view -> mListener.onSelected(
 				(PostListingURL)MultiredditPostListURL.getMultireddit(name));
 
+		final View.OnLongClickListener longClickListener = view -> {
+			RedditAPIMultiredditAction.showActionMenu(mActivity, name);
+			return true;
+		};
+
 		return new GroupedRecyclerViewItemListItemView(
 				null,
 				name,
 				ScreenreaderPronunciation.getPronunciation(mContext, name),
 				hideDivider,
 				clickListener,
-				null,
+				longClickListener,
 				Optional.empty(),
 				Optional.empty(),
 				Optional.empty());

src/main/java/org/quantumbadger/redreader/cache/CacheDownload.java

@@ -75,6 +75,7 @@ public CacheDownload(
 				initiator.context,
 				new HTTPBackend.RequestDetails(
 						mInitiator.url,
+						mInitiator.requestMethod,
 						mInitiator.requestBody.asNullable()));
 	}
 

src/main/java/org/quantumbadger/redreader/cache/CacheRequest.java

@@ -64,6 +64,12 @@ public enum RequestFailureType {
 		CACHE_DIR_DOES_NOT_EXIST
 	}
 
+	public enum RequestMethod {
+		GET,
+		POST,
+		DELETE
+	}
+
 	public final UriString url;
 	public final RedditAccount user;
 	public final UUID requestSession;
@@ -75,6 +81,7 @@ public enum RequestFailureType {
 	public final int fileType;
 
 	public final DownloadQueueType queueType;
+	public final RequestMethod requestMethod;
 	@NonNull public final Optional<HTTPRequestBody> requestBody;
 
 	public final boolean cache;
@@ -114,6 +121,7 @@ public CacheRequest(
 			@NonNull final DownloadStrategy downloadStrategy,
 			final int fileType,
 			final DownloadQueueType queueType,
+			final RequestMethod requestMethod,
 			final boolean cache,
 			@NonNull final Context context,
 			@NonNull final CacheRequestCallbacks callbacks) {
@@ -126,6 +134,7 @@ public CacheRequest(
 				downloadStrategy,
 				fileType,
 				queueType,
+				requestMethod,
 				null,
 				cache,
 				context,
@@ -140,6 +149,7 @@ public CacheRequest(
 			@NonNull final DownloadStrategy downloadStrategy,
 			final int fileType,
 			final DownloadQueueType queueType,
+			final RequestMethod requestMethod,
 			@NonNull final Context context,
 			@NonNull final CacheRequestCallbacks callbacks) {
 
@@ -151,6 +161,7 @@ public CacheRequest(
 				downloadStrategy,
 				fileType,
 				queueType,
+				requestMethod,
 				true,
 				context,
 				callbacks);
@@ -164,6 +175,7 @@ public CacheRequest(
 			@NonNull final DownloadStrategy downloadStrategy,
 			final int fileType,
 			final DownloadQueueType queueType,
+			final RequestMethod requestMethod,
 			@Nullable final HTTPRequestBody requestBody,
 			@NonNull final Context context,
 			@NonNull final CacheRequestCallbacks callbacks) {
@@ -176,6 +188,7 @@ public CacheRequest(
 				downloadStrategy,
 				fileType,
 				queueType,
+				requestMethod,
 				requestBody,
 				false,
 				context,
@@ -191,6 +204,7 @@ private CacheRequest(
 			@NonNull final DownloadStrategy downloadStrategy,
 			final int fileType,
 			final DownloadQueueType queueType,
+			final RequestMethod requestMethod,
 			@Nullable final HTTPRequestBody requestBody,
 			final boolean cache,
 			@NonNull final Context context,
@@ -216,6 +230,7 @@ private CacheRequest(
 		this.downloadStrategy = downloadStrategy;
 		this.fileType = fileType;
 		this.queueType = queueType;
+		this.requestMethod = requestMethod;
 		this.requestBody = Optional.ofNullable(requestBody);
 		this.cache = (requestBody == null) && cache;
 

src/main/java/org/quantumbadger/redreader/common/Constants.java

@@ -149,6 +149,7 @@ public static final class Reddit {
 		public static final String PATH_MULTIREDDITS_MINE = "/api/multi/mine.json";
 		public static final String PATH_COMMENTS = "/comments/";
 		public static final String PATH_ME = "/api/v1/me";
+		public static final String PATH_MULTIREDDIT = "/api/multi";
 
 		public static String getScheme() {
 			return SCHEME_HTTPS;

src/main/java/org/quantumbadger/redreader/common/FileUtils.java

@@ -487,6 +487,7 @@ private static void internalDownloadImageToSaveAudio(
 				DownloadStrategyIfNotCached.INSTANCE,
 				Constants.FileType.IMAGE,
 				CacheRequest.DownloadQueueType.IMMEDIATE,
+				CacheRequest.RequestMethod.GET,
 				activity,
 				new CacheRequestCallbacks() {
 
@@ -604,6 +605,7 @@ public void onSuccess(final ImageInfo info) {
 								DownloadStrategyIfNotCached.INSTANCE,
 								Constants.FileType.IMAGE,
 								CacheRequest.DownloadQueueType.IMMEDIATE,
+								CacheRequest.RequestMethod.GET,
 								activity,
 								new CacheRequestCallbacks() {
 									@Override

src/main/java/org/quantumbadger/redreader/common/General.kt

@@ -308,9 +308,15 @@ object General {
 									if(status == 404) {
 										title = R.string.error_404_title
 										message = R.string.error_404_message
-									} else {
+									} else if (status == 403) {
 										title = R.string.error_403_title
 										message = R.string.error_403_message
+									} else if (status == 401) {
+										title = R.string.error_401_title
+										message = R.string.error_401_message
+									} else {
+										title = R.string.error_400_title
+										message = R.string.error_400_message
 									}
 								}
 							}

src/main/java/org/quantumbadger/redreader/common/PrefsUtility.java

@@ -37,6 +37,7 @@
 import org.quantumbadger.redreader.reddit.PostSort;
 import org.quantumbadger.redreader.reddit.UserCommentSort;
 import org.quantumbadger.redreader.reddit.api.RedditAPICommentAction;
+import org.quantumbadger.redreader.reddit.api.RedditAPIMultiredditAction;
 import org.quantumbadger.redreader.reddit.api.RedditPostActions;
 import org.quantumbadger.redreader.reddit.things.InvalidSubredditNameException;
 import org.quantumbadger.redreader.reddit.things.SubredditCanonicalId;
@@ -1789,6 +1790,24 @@ public static String pref_reddit_client_id_override() {
 		return valueTrimmed;
 	}
 
+	public static EnumSet<RedditAPIMultiredditAction.MultiredditAction>
+	pref_menus_multireddit_context_items() {
+		final Set<String> strings = getStringSet(
+				R.string.pref_menus_multireddits_context_items_key,
+				R.array.pref_menus_multireddits_context_items_return);
+
+		final EnumSet<RedditAPIMultiredditAction.MultiredditAction> result
+				= EnumSet.noneOf(
+				RedditAPIMultiredditAction.MultiredditAction.class);
+
+		for(final String s : strings) {
+			result.add(RedditAPIMultiredditAction.MultiredditAction.valueOf(
+					StringUtils.asciiUppercase(s)));
+		}
+
+		return result;
+	}
+
 	private static final String REDDIT_USER_AGREEMENT_PREF = "accepted_reddit_user_agreement";
 	private static final int REDDIT_USER_AGREEMENT_DECLINED = -1;
 	private static final int REDDIT_USER_AGREEMENT_APRIL_2023 = 1;

src/main/java/org/quantumbadger/redreader/compose/net/NetWrapper.kt

@@ -315,6 +315,7 @@ private fun <T> fetchFile(
 			downloadStrategy,
 			fileType,
 			queueType,
+			CacheRequest.RequestMethod.GET,
 			cache,
 			context,
 			object : CacheRequestCallbacks {

src/main/java/org/quantumbadger/redreader/fragments/PostListingFragment.java

@@ -74,6 +74,7 @@
 import org.quantumbadger.redreader.reddit.PostSort;
 import org.quantumbadger.redreader.reddit.RedditPostListItem;
 import org.quantumbadger.redreader.reddit.RedditSubredditManager;
+import org.quantumbadger.redreader.reddit.api.RedditAPIMultiredditAction;
 import org.quantumbadger.redreader.reddit.api.RedditSubredditSubscriptionManager;
 import org.quantumbadger.redreader.reddit.kthings.JsonUtils;
 import org.quantumbadger.redreader.reddit.kthings.MaybeParseError;
@@ -275,11 +276,18 @@ public void onScrolled(
 				break;
 
 			case RedditURLParser.USER_POST_LISTING_URL:
-			case RedditURLParser.MULTIREDDIT_POST_LISTING_URL:
 				setHeader(
+					mPostListingURL.humanReadableName(getActivity(), true),
+					mPostListingURL.humanReadableUrl(),
+					null);
+				CacheManager.getInstance(context).makeRequest(mRequest);
+				break;
+
+			case RedditURLParser.MULTIREDDIT_POST_LISTING_URL:
+				setMultiredditHeader(
 						mPostListingURL.humanReadableName(getActivity(), true),
 						mPostListingURL.humanReadableUrl(),
-						null);
+						mPostListingURL.asMultiredditPostListURL().name);
 				CacheManager.getInstance(context).makeRequest(mRequest);
 				break;
 
@@ -464,6 +472,28 @@ private void onSubredditReceived() {
 
 	}
 
+	private void setMultiredditHeader(
+			@NonNull final String title,
+			@NonNull final String subtitle,
+			@NonNull final String multiredditName) {
+
+		final PostListingHeader postListingHeader = new PostListingHeader(
+				getActivity(),
+				title,
+				subtitle,
+				mPostListingURL,
+				null);
+
+		setHeader(postListingHeader);
+
+		postListingHeader.setOnLongClickListener(view -> {
+			RedditAPIMultiredditAction.showActionMenu(
+					getActivity(),
+					multiredditName);
+			return true;
+		});
+	}
+
 	private void setHeader(
 			@NonNull final String title,
 			@NonNull final String subtitle,
@@ -665,6 +695,7 @@ private CacheRequest createPostListingRequest(
 				downloadStrategy,
 				Constants.FileType.POST_LIST,
 				CacheRequest.DownloadQueueType.REDDIT_API,
+				CacheRequest.RequestMethod.GET,
 				activity,
 				new CacheRequestCallbacks() {
 					@Override
@@ -1018,6 +1049,7 @@ private void precacheComments(
 								TimestampBound.notOlderThan(TimeDuration.minutes(15))),
 						Constants.FileType.COMMENT_LIST,
 						CacheRequest.DownloadQueueType.REDDIT_API,
+						CacheRequest.RequestMethod.GET,
 						// Don't parse the JSON
 						activity,
 						new CacheRequestCallbacks() {
@@ -1133,6 +1165,7 @@ private void precacheImage(
 				DownloadStrategyIfNotCached.INSTANCE,
 				Constants.FileType.IMAGE,
 				CacheRequest.DownloadQueueType.IMAGE_PRECACHE,
+				CacheRequest.RequestMethod.GET,
 				activity,
 				new CacheRequestCallbacks() {
 					@Override