Method onExecute

app/src/main/java/eu/faircode/email/ActivityAMP.java:224–282

(Context context, Bundle args)

            }

            @Override
            protected String onExecute(Context context, Bundle args) throws Throwable {
                Uri uri = args.getParcelable("uri");
                long id = args.getLong("id");

                NoStreamException.check(uri, context);

                DB db = DB.getInstance(context);
                EntityMessage message = db.message().getMessage(id);

                args.putString("subject",
                        message == null || message.subject == null ? "AMP" : message.subject);

                SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
                boolean overview_mode = prefs.getBoolean("overview_mode", false);

                String html;
                ContentResolver resolver = context.getContentResolver();
                try (InputStream is = resolver.openInputStream(uri)) {
                    if (is == null)
                        throw new FileNotFoundException(uri.toString());
                    html = Helper.readStream(is);
                }

                Document d = JsoupEx.parse(html);
                HtmlHelper.setViewport(d, overview_mode);
                if (message != null)
                    HtmlHelper.embedInlineImages(context, message.id, d, true);

                for (Element elm : d.select("*")) {
                    if ("script".equals(elm.tagName())) {
                        String src = elm.attr("src");

                        if (src.isEmpty()) {
                            elm.remove();
                            continue;
                        }

                        Uri u = Uri.parse(src);
                        String host = (u.isHierarchical() ? u.getHost() : null);
                        if (host == null || !ALLOWED_SCRIPT_HOSTS.contains(host.toLowerCase(Locale.ROOT))) {
                            elm.remove();
                            continue;
                        }
                    }

                    List<String> toRemove = new ArrayList<>();
                    for (Attribute attr : elm.attributes()) {
                        String key = attr.getKey().toLowerCase(Locale.ROOT);
                        String val = attr.getValue().trim().toLowerCase();
                        if (val.startsWith("javascript:") || key.startsWith("on"))
                            toRemove.add(attr.getKey());
                    }

                    toRemove.forEach(elm::removeAttr);
                }

                return d.html();