try to fix some NPE in RichPreview

1 files changed, 178 insertions, 0 deletions

diff --git a/src/main/java/de/pixart/messenger/utils/RichPreview.java b/src/main/java/de/pixart/messenger/utils/RichPreview.java
new file mode 100644
index 000000000..639a02c8d
--- /dev/null
+++ b/src/main/java/de/pixart/messenger/utils/RichPreview.java
@@ -0,0 +1,178 @@
+package de.pixart.messenger.utils;
+
+import android.os.AsyncTask;
+import android.webkit.URLUtil;
+
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+import org.jsoup.nodes.Element;
+import org.jsoup.select.Elements;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+
+import io.github.ponnamkarthik.richlinkpreview.MetaData;
+import io.github.ponnamkarthik.richlinkpreview.ResponseListener;
+
+/**
+ * Created by ponna on 16-01-2018.
+ */
+
+public class RichPreview {
+
+    MetaData metaData;
+    ResponseListener responseListener;
+    String url;
+
+    public RichPreview(ResponseListener responseListener) {
+        this.responseListener = responseListener;
+        metaData = new MetaData();
+    }
+
+    public void getPreview(String url) {
+        this.url = url;
+        new RichPreview.getData().execute();
+    }
+
+    private class getData extends AsyncTask<Void, Void, Void> {
+
+        @Override
+        protected Void doInBackground(Void... params) {
+            Document doc = null;
+            try {
+                doc = Jsoup.connect(url)
+                        .timeout(30 * 1000)
+                        .get();
+
+                Elements elements = doc.getElementsByTag("meta");
+
+                // getTitle doc.select("meta[property=og:title]")
+                String title = doc.select("meta[property=og:title]").attr("content");
+
+                if (title == null || title.isEmpty()) {
+                    title = doc.title();
+                }
+                metaData.setTitle(title);
+
+                //getDescription
+                String description = doc.select("meta[name=description]").attr("content");
+                if (description.isEmpty() || description == null) {
+                    description = doc.select("meta[name=Description]").attr("content");
+                }
+                if (description.isEmpty() || description == null) {
+                    description = doc.select("meta[property=og:description]").attr("content");
+                }
+                if (description.isEmpty() || description == null) {
+                    description = "";
+                }
+                metaData.setDescription(description);
+
+
+                // getMediaType
+                Elements mediaTypes = doc.select("meta[name=medium]");
+                String type = "";
+                if (mediaTypes.size() > 0) {
+                    String media = mediaTypes.attr("content");
+
+                    type = media.equals("image") ? "photo" : media;
+                } else {
+                    type = doc.select("meta[property=og:type]").attr("content");
+                }
+                metaData.setMediatype(type);
+
+
+                //getImages
+                Elements imageElements = doc.select("meta[property=og:image]");
+                if (imageElements.size() > 0) {
+                    String image = imageElements.attr("content");
+                    if (!image.isEmpty()) {
+                        metaData.setImageurl(resolveURL(url, image));
+                    }
+                }
+                if (metaData.getImageurl().isEmpty()) {
+                    String src = doc.select("link[rel=image_src]").attr("href");
+                    if (!src.isEmpty()) {
+                        metaData.setImageurl(resolveURL(url, src));
+                    } else {
+                        src = doc.select("link[rel=apple-touch-icon]").attr("href");
+                        if (!src.isEmpty()) {
+                            metaData.setImageurl(resolveURL(url, src));
+                            metaData.setFavicon(resolveURL(url, src));
+                        } else {
+                            src = doc.select("link[rel=icon]").attr("href");
+                            if (!src.isEmpty()) {
+                                metaData.setImageurl(resolveURL(url, src));
+                                metaData.setFavicon(resolveURL(url, src));
+                            }
+                        }
+                    }
+                }
+
+                //Favicon
+                String src = doc.select("link[rel=apple-touch-icon]").attr("href");
+                if (!src.isEmpty()) {
+                    metaData.setFavicon(resolveURL(url, src));
+                } else {
+                    src = doc.select("link[rel=icon]").attr("href");
+                    if (!src.isEmpty()) {
+                        metaData.setFavicon(resolveURL(url, src));
+                    }
+                }
+
+                for (Element element : elements) {
+                    if (element.hasAttr("property")) {
+                        String str_property = element.attr("property").toString().trim();
+                        if (str_property.equals("og:url")) {
+                            metaData.setUrl(element.attr("content").toString());
+                        }
+                        if (str_property.equals("og:site_name")) {
+                            metaData.setSitename(element.attr("content").toString());
+                        }
+                    }
+                }
+
+                if (metaData.getUrl().equals("") || metaData.getUrl().isEmpty()) {
+                    URI uri = null;
+                    try {
+                        uri = new URI(url);
+                    } catch (URISyntaxException e) {
+                        e.printStackTrace();
+                    }
+                    if (url == null) {
+                        metaData.setUrl(url);
+                    } else {
+                        metaData.setUrl(uri != null ? uri.getHost() : null);
+                    }
+                }
+
+            } catch (IOException e) {
+                e.printStackTrace();
+                responseListener.onError(new Exception("No Html Received from " + url + " Check your Internet " + e.getLocalizedMessage()));
+            }
+            return null;
+        }
+
+        @Override
+        protected void onPostExecute(Void aVoid) {
+            super.onPostExecute(aVoid);
+            responseListener.onData(metaData);
+        }
+    }
+
+    private String resolveURL(String url, String part) {
+        if (URLUtil.isValidUrl(part)) {
+            return part;
+        } else {
+            URI base_uri = null;
+            try {
+                base_uri = new URI(url);
+            } catch (URISyntaxException e) {
+                e.printStackTrace();
+            }
+            base_uri = base_uri != null ? base_uri.resolve(part) : null;
+            return base_uri != null ? base_uri.toString() : null;
+        }
+    }
+}
+