Method upload

app/src/extra/java/eu/faircode/email/VirusTotal.java:96–170

(Context context, File file, String apiKey)

    }

    static String upload(Context context, File file, String apiKey) throws IOException, JSONException {
        // Get upload URL
        Pair<Integer, String> response = call(context, "api/v3/files/upload_url", apiKey);
        if (response.first != HttpsURLConnection.HTTP_OK)
            throw new FileNotFoundException(response.second);
        JSONObject jurl = new JSONObject(response.second);
        String upload_url = jurl.getString("data");

        // Upload file
        String boundary = "----FairEmail." + System.currentTimeMillis();

        URL url = new URL(upload_url);
        Log.i("VT upload url=" + url);
        HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
        connection.setRequestMethod("POST");
        connection.setDoOutput(true);
        connection.setReadTimeout(VT_TIMEOUT * 1000);
        connection.setConnectTimeout(VT_TIMEOUT * 1000);
        ConnectionHelper.setUserAgent(context, connection);
        connection.setRequestProperty("x-apikey", apiKey);
        connection.setRequestProperty("Accept", "application/json");
        connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
        connection.connect();

        try {
            OutputStream os = connection.getOutputStream();

            PrintWriter writer = new PrintWriter(new OutputStreamWriter(os));
            writer
                    .append("--").append(boundary).append("\r\n")
                    .append("Content-Disposition: form-data;")
                    .append(" name=\"file\";")
                    .append(" filename=\"").append(file.getName()).append("\"").append("\r\n")
                    .append("Content-Type: application/octet-stream").append("\r\n")
                    .append("Content-Transfer-Encoding: binary").append("\r\n")
                    .append("\r\n")
                    .flush();

            try (InputStream is = new FileInputStream(file)) {
                Helper.copy(is, os);
            }

            os.flush();

            writer
                    .append("\r\n")
                    .append("--").append(boundary).append("--").append("\r\n")
                    .flush();

            writer.close();

            int status = connection.getResponseCode();
            if (status != HttpsURLConnection.HTTP_OK) {
                String error = "Error " + status + ": " + connection.getResponseMessage();
                try {
                    InputStream is = connection.getErrorStream();
                    if (is != null)
                        error += "\n" + Helper.readStream(is);