added app certificate fallback

brouter-routing-app/src/main/java/btools/routingapp/DownloadWorker.java

@@ -73,6 +73,7 @@ public class DownloadWorker extends Worker {
   int version = -1;
   int appversion = -1;
   String errorCode = null;
+  private boolean bHttpDownloadProblem;
 
   public DownloadWorker(
     @NonNull Context context,
@@ -255,6 +256,7 @@ public class DownloadWorker extends Worker {
           newappversion = meta.minAppVersion;
         } else {
           String lookupLocation = mServerConfig.getLookupUrl() + fileName;
+          if (bHttpDownloadProblem) lookupLocation = lookupLocation.replace("https://", "http://");
           URL lookupUrl = new URL(lookupLocation);
           downloadProgressListener.onDownloadStart(fileName, DownloadType.LOOKUP);
           changed = downloadFile(lookupUrl, tmplookupFile, size, false, DownloadType.LOOKUP);
@@ -305,6 +307,7 @@ public class DownloadWorker extends Worker {
         //if (profileFile.exists())
         {
           String profileLocation = mServerConfig.getProfilesUrl() + fileName;
+          if (bHttpDownloadProblem) profileLocation = profileLocation.replace("https://", "http://");
           URL profileUrl = new URL(profileLocation);
           int size = (int) (profileFile.exists() ? profileFile.length() : 0);
 
@@ -326,6 +329,8 @@ public class DownloadWorker extends Worker {
   private void downloadSegment(String segmentBaseUrl, String segmentName) throws IOException, InterruptedException {
     File segmentFile = new File(baseDir, SEGMENTS_DIR + segmentName);
     File segmentFileTemp = new File(segmentFile.getAbsolutePath() + "_tmp");
+    if (bHttpDownloadProblem) segmentBaseUrl = segmentBaseUrl.replace("https://", "http://");
+
     if (DEBUG) Log.d(LOG_TAG, "Download " + segmentName + " " + version + " " + versionChanged);
     try {
       if (segmentFile.exists()) {
@@ -333,6 +338,7 @@ public class DownloadWorker extends Worker {
           String md5 = Rd5DiffManager.getMD5(segmentFile);
           if (DEBUG) Log.d(LOG_TAG, "Calculating local checksum " + md5);
           String segmentDeltaLocation = segmentBaseUrl + "diff/" + segmentName.replace(SEGMENT_SUFFIX, "/" + md5 + SEGMENT_DIFF_SUFFIX);
+          if (bHttpDownloadProblem) segmentDeltaLocation = segmentDeltaLocation.replace("https://", "http://");
           URL segmentDeltaUrl = new URL(segmentDeltaLocation);
           if (httpFileExists(segmentDeltaUrl)) {
             File segmentDeltaFile = new File(segmentFile.getAbsolutePath() + "_diff");
@@ -376,13 +382,28 @@ public class DownloadWorker extends Worker {
   }
 
   private boolean httpFileExists(URL downloadUrl) throws IOException {
-    HttpURLConnection connection = (HttpURLConnection) downloadUrl.openConnection();
+    HttpURLConnection connection = null;
-    connection.setConnectTimeout(5000);
-    connection.setRequestMethod("HEAD");
-    connection.setDoInput(false);
     try {
+      connection = (HttpURLConnection) downloadUrl.openConnection();
+      connection.setConnectTimeout(5000);
+      connection.setRequestMethod("HEAD");
+      connection.setDoInput(false);
       connection.connect();
       return connection.getResponseCode() == HttpURLConnection.HTTP_OK;
+    } catch (javax.net.ssl.SSLHandshakeException e) {
+      String url = downloadUrl.toString().replace("https://", "http://");
+      downloadUrl = new URL(url);
+      try {
+        connection = (HttpURLConnection) downloadUrl.openConnection();
+        connection.setConnectTimeout(5000);
+        connection.setRequestMethod("HEAD");
+        connection.setDoInput(false);
+        connection.connect();
+        bHttpDownloadProblem = true;
+        return connection.getResponseCode() == HttpURLConnection.HTTP_OK;
+      } finally {
+        connection.disconnect();
+      }
     } finally {
       connection.disconnect();
     }
@@ -391,14 +412,24 @@ public class DownloadWorker extends Worker {
 
   private boolean downloadFile(URL downloadUrl, File outputFile, int fileSize, boolean limitDownloadSpeed, DownloadType type) throws IOException, InterruptedException {
     if (DEBUG) Log.d(LOG_TAG, "download " + outputFile.getAbsolutePath());
-    HttpURLConnection connection = (HttpURLConnection) downloadUrl.openConnection();
+    HttpURLConnection connection = null;
-    connection.setConnectTimeout(5000);
-    connection.setDefaultUseCaches(false);
-
     InputStream input = null;
     OutputStream output = null;
     try {
-      connection.connect();
+      try {
+        connection = (HttpURLConnection) downloadUrl.openConnection();
+        connection.setConnectTimeout(5000);
+        connection.setDefaultUseCaches(false);
+        connection.connect();
+      } catch (javax.net.ssl.SSLHandshakeException e) {
+        String url = downloadUrl.toString().replace("https://", "http://");
+        downloadUrl = new URL(url);
+        connection = (HttpURLConnection) downloadUrl.openConnection();
+        connection.setConnectTimeout(5000);
+        connection.setDefaultUseCaches(false);
+        connection.connect();
+        bHttpDownloadProblem = true;
+      }
 
       if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
         throw new IOException("HTTP Request failed: " + downloadUrl + " returned " + connection.getResponseCode());