Added quick discovery fragment

1 files changed, 110 insertions, 0 deletions

diff --git a/app/src/main/java/de/danoeh/antennapod/discovery/ItunesTopListLoader.java b/app/src/main/java/de/danoeh/antennapod/discovery/ItunesTopListLoader.java
new file mode 100644
index 000000000..bc9133258
--- /dev/null
+++ b/app/src/main/java/de/danoeh/antennapod/discovery/ItunesTopListLoader.java
@@ -0,0 +1,110 @@
+package de.danoeh.antennapod.discovery;
+
+import android.content.Context;
+import de.danoeh.antennapod.R;
+import de.danoeh.antennapod.core.ClientConfig;
+import de.danoeh.antennapod.core.service.download.AntennapodHttpClient;
+import io.reactivex.Single;
+import io.reactivex.SingleOnSubscribe;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.schedulers.Schedulers;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+
+public class ItunesTopListLoader {
+    private final Context context;
+
+    public ItunesTopListLoader(Context context) {
+        this.context = context;
+    }
+
+    public Single<List<PodcastSearchResult>> loadToplist(int limit) {
+        return Single.create((SingleOnSubscribe<List<PodcastSearchResult>>) emitter -> {
+            String lang = Locale.getDefault().getLanguage();
+            OkHttpClient client = AntennapodHttpClient.getHttpClient();
+            String feedString;
+            try {
+                try {
+                    feedString = getTopListFeed(client, lang, limit);
+                } catch (IOException e) {
+                    feedString = getTopListFeed(client, "us", limit);
+                }
+                List<PodcastSearchResult> podcasts = parseFeed(feedString);
+                emitter.onSuccess(podcasts);
+            } catch (IOException | JSONException e) {
+                emitter.onError(e);
+            }
+        })
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread());
+    }
+
+    public Single<String> getFeedUrl(PodcastSearchResult podcast) {
+        if (!podcast.feedUrl.contains("itunes.apple.com")) {
+            return Single.just(podcast.feedUrl)
+                    .observeOn(AndroidSchedulers.mainThread());
+        }
+        return Single.create((SingleOnSubscribe<String>) emitter -> {
+            OkHttpClient client = AntennapodHttpClient.getHttpClient();
+            Request.Builder httpReq = new Request.Builder()
+                    .url(podcast.feedUrl)
+                    .header("User-Agent", ClientConfig.USER_AGENT);
+            try {
+                Response response = client.newCall(httpReq.build()).execute();
+                if (response.isSuccessful()) {
+                    String resultString = response.body().string();
+                    JSONObject result = new JSONObject(resultString);
+                    JSONObject results = result.getJSONArray("results").getJSONObject(0);
+                    String feedUrl = results.getString("feedUrl");
+                    emitter.onSuccess(feedUrl);
+                } else {
+                    String prefix = context.getString(R.string.error_msg_prefix);
+                    emitter.onError(new IOException(prefix + response));
+                }
+            } catch (IOException | JSONException e) {
+                emitter.onError(e);
+            }
+        })
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread());
+    }
+
+    private String getTopListFeed(OkHttpClient client, String language, int limit) throws IOException {
+        String url = "https://itunes.apple.com/%s/rss/toppodcasts/limit="+limit+"/explicit=true/json";
+        Request.Builder httpReq = new Request.Builder()
+                .header("User-Agent", ClientConfig.USER_AGENT)
+                .url(String.format(url, language));
+
+        try (Response response = client.newCall(httpReq.build()).execute()) {
+            if (response.isSuccessful()) {
+                return response.body().string();
+            }
+            String prefix = context.getString(R.string.error_msg_prefix);
+            throw new IOException(prefix + response);
+        }
+    }
+
+    private List<PodcastSearchResult> parseFeed(String jsonString) throws JSONException {
+        JSONObject result = new JSONObject(jsonString);
+        JSONObject feed = result.getJSONObject("feed");
+        JSONArray entries = feed.getJSONArray("entry");
+
+        List<PodcastSearchResult> results = new ArrayList<>();
+        for (int i=0; i < entries.length(); i++) {
+            JSONObject json = entries.getJSONObject(i);
+            results.add(PodcastSearchResult.fromItunesToplist(json));
+        }
+
+        return results;
+    }
+
+}