Merge branch '8827_handle_switch_provider' into '0.9.8'

8827 handle switch provider

See merge request leap/bitmask_android!38

3 files changed, 119 insertions, 171 deletions

diff --git a/app/src/insecure/java/se/leap/bitmaskclient/ProviderApiManager.java b/app/src/insecure/java/se/leap/bitmaskclient/ProviderApiManager.java
index 8ca971e0..1c5247c0 100644
--- a/app/src/insecure/java/se/leap/bitmaskclient/ProviderApiManager.java
+++ b/app/src/insecure/java/se/leap/bitmaskclient/ProviderApiManager.java
@@ -48,22 +48,25 @@ import okhttp3.OkHttpClient;
 import se.leap.bitmaskclient.eip.EIP;
 
 import static android.text.TextUtils.isEmpty;
-import static se.leap.bitmaskclient.Constants.PROVIDER_ALLOWED_REGISTERED;
-import static se.leap.bitmaskclient.Constants.PROVIDER_ALLOW_ANONYMOUS;
+import static se.leap.bitmaskclient.Constants.BROADCAST_RESULT_KEY;
 import static se.leap.bitmaskclient.Constants.PROVIDER_KEY;
 import static se.leap.bitmaskclient.Constants.PROVIDER_VPN_CERTIFICATE;
 import static se.leap.bitmaskclient.DownloadFailedDialog.DOWNLOAD_ERRORS.ERROR_CERTIFICATE_PINNING;
+import static se.leap.bitmaskclient.DownloadFailedDialog.DOWNLOAD_ERRORS.ERROR_CORRUPTED_PROVIDER_JSON;
 import static se.leap.bitmaskclient.ProviderAPI.ERRORS;
-import static se.leap.bitmaskclient.ProviderAPI.RESULT_KEY;
 import static se.leap.bitmaskclient.R.string.certificate_error;
 import static se.leap.bitmaskclient.R.string.malformed_url;
 import static se.leap.bitmaskclient.R.string.warning_corrupted_provider_cert;
+import static se.leap.bitmaskclient.R.string.warning_corrupted_provider_details;
 
 /**
  * Created by cyberta on 04.01.18.
  */
 
 public class ProviderApiManager extends ProviderApiManagerBase {
+
+    private static final String TAG = ProviderApiManagerBase.class.getName();
+
     protected static boolean lastDangerOn = true;
 
 
@@ -79,142 +82,116 @@ public class ProviderApiManager extends ProviderApiManagerBase {
      * Downloads a provider.json from a given URL, adding a new provider using the given name.
      *
      * @param task containing a boolean meaning if the provider is custom or not, another boolean meaning if the user completely trusts this provider, the provider name and its provider.json url.
-     * @return a bundle with a boolean value mapped to a key named RESULT_KEY, and which is true if the update was successful.
+     * @return a bundle with a boolean value mapped to a key named BROADCAST_RESULT_KEY, and which is true if the update was successful.
      */
     @Override
-    protected Bundle setUpProvider(Bundle task) {
-        int progress = 0;
+    protected Bundle setUpProvider(Provider provider, Bundle task) {
         Bundle currentDownload = new Bundle();
 
         if (task != null) {
             lastDangerOn = task.containsKey(ProviderListContent.ProviderItem.DANGER_ON) && task.getBoolean(ProviderListContent.ProviderItem.DANGER_ON);
-            lastProviderMainUrl = task.containsKey(Provider.MAIN_URL) ?
-                    task.getString(Provider.MAIN_URL) :
-                    "";
-
-            if (isEmpty(lastProviderMainUrl)) {
-                setErrorResult(currentDownload, malformed_url, null);
-                return currentDownload;
-            }
-
-            providerCaCertFingerprint = task.containsKey(Provider.CA_CERT_FINGERPRINT) ?
-                    task.getString(Provider.CA_CERT_FINGERPRINT) :
-                    "";
-            providerCaCert = task.containsKey(Provider.CA_CERT) ?
-                    task.getString(Provider.CA_CERT) :
-                    "";
-
-            try {
-                providerDefinition = task.containsKey(Provider.KEY) ?
-                        new JSONObject(task.getString(Provider.KEY)) :
-                        new JSONObject();
-            } catch (JSONException e) {
-                e.printStackTrace();
-                providerDefinition = new JSONObject();
-            }
-            providerApiUrl = getApiUrlWithVersion(providerDefinition);
+        }
 
-            checkPersistedProviderUpdates();
-            currentDownload = validateProviderDetails();
+        if (isEmpty(provider.getMainUrlString()) || provider.getMainUrl().isDefault()) {
+            setErrorResult(currentDownload, malformed_url, null);
+            currentDownload.putParcelable(PROVIDER_KEY, provider);
+            return currentDownload;
+        }
 
-            //provider details invalid
-            if (currentDownload.containsKey(ERRORS)) {
-                return currentDownload;
-            }
+        getPersistedProviderUpdates(provider);
+        currentDownload = validateProviderDetails(provider);
 
-            //no provider certificate available
-            if (currentDownload.containsKey(RESULT_KEY) && !currentDownload.getBoolean(RESULT_KEY)) {
-                resetProviderDetails();
-            }
+        //provider details invalid
+        if (currentDownload.containsKey(ERRORS)) {
+            currentDownload.putParcelable(PROVIDER_KEY, provider);
+            return currentDownload;
+        }
 
-            EIP_SERVICE_JSON_DOWNLOADED = false;
-            go_ahead = true;
+        //no provider certificate available
+        if (currentDownload.containsKey(BROADCAST_RESULT_KEY) && !currentDownload.getBoolean(BROADCAST_RESULT_KEY)) {
+            resetProviderDetails(provider);
         }
 
-        if (!PROVIDER_JSON_DOWNLOADED)
-            currentDownload = getAndSetProviderJson(lastProviderMainUrl, lastDangerOn, providerCaCert, providerDefinition);
-        if (PROVIDER_JSON_DOWNLOADED || (currentDownload.containsKey(RESULT_KEY) && currentDownload.getBoolean(RESULT_KEY))) {
-            broadcastProgress(progress++);
-            PROVIDER_JSON_DOWNLOADED = true;
-
-            if (!CA_CERT_DOWNLOADED)
-                currentDownload = downloadCACert(lastDangerOn);
-            if (CA_CERT_DOWNLOADED || (currentDownload.containsKey(RESULT_KEY) && currentDownload.getBoolean(RESULT_KEY))) {
-                broadcastProgress(progress++);
-                CA_CERT_DOWNLOADED = true;
-                currentDownload = getAndSetEipServiceJson();
-                if (currentDownload.containsKey(RESULT_KEY) && currentDownload.getBoolean(RESULT_KEY)) {
-                    broadcastProgress(progress++);
-                    EIP_SERVICE_JSON_DOWNLOADED = true;
-                }
+        if (!provider.hasDefinition())
+            currentDownload = getAndSetProviderJson(provider, lastDangerOn);
+        if (provider.hasDefinition() || (currentDownload.containsKey(BROADCAST_RESULT_KEY) && currentDownload.getBoolean(BROADCAST_RESULT_KEY))) {
+            if (!provider.hasCaCert())
+                currentDownload = downloadCACert(provider, lastDangerOn);
+            if (provider.hasCaCert() || (currentDownload.containsKey(BROADCAST_RESULT_KEY) && currentDownload.getBoolean(BROADCAST_RESULT_KEY))) {
+                currentDownload = getAndSetEipServiceJson(provider);
             }
         }
-
+        currentDownload.putParcelable(PROVIDER_KEY, provider);
         return currentDownload;
     }
 
-    private Bundle getAndSetProviderJson(String providerMainUrl, boolean dangerOn, String caCert, JSONObject providerDefinition) {
+    private Bundle getAndSetProviderJson(Provider provider, boolean dangerOn) {
         Bundle result = new Bundle();
 
-        if (go_ahead) {
-            String providerDotJsonString;
-            if(providerDefinition.length() == 0 || caCert.isEmpty())
-                providerDotJsonString = downloadWithCommercialCA(providerMainUrl + "/provider.json", dangerOn);
-            else
-                providerDotJsonString = downloadFromApiUrlWithProviderCA("/provider.json", caCert, providerDefinition, dangerOn);
+        JSONObject providerDefinition = provider.getDefinition();
+        String caCert = provider.getCaCert();
+        String providerMainUrl = provider.getMainUrlString();
 
-            if (!isValidJson(providerDotJsonString)) {
-                result.putString(ERRORS, resources.getString(malformed_url));
-                result.putBoolean(RESULT_KEY, false);
-                return result;
-            }
+        String providerDotJsonString;
+        if(providerDefinition.length() == 0 || caCert.isEmpty())
+            providerDotJsonString = downloadWithCommercialCA(providerMainUrl + "/provider.json", dangerOn);
+        else
+            providerDotJsonString = downloadFromApiUrlWithProviderCA("/provider.json", caCert, providerDefinition, dangerOn);
 
-            try {
-                JSONObject providerJson = new JSONObject(providerDotJsonString);
-                String providerDomain = getDomainFromMainURL(lastProviderMainUrl);
-                providerApiUrl = getApiUrlWithVersion(providerJson);
-                //String name = providerJson.getString(Provider.NAME);
-                //TODO setProviderName(name);
-
-                preferences.edit().putString(Provider.KEY, providerJson.toString()).
-                        putBoolean(PROVIDER_ALLOW_ANONYMOUS, providerJson.getJSONObject(Provider.SERVICE).getBoolean(PROVIDER_ALLOW_ANONYMOUS)).
-                        putBoolean(PROVIDER_ALLOWED_REGISTERED, providerJson.getJSONObject(Provider.SERVICE).getBoolean(PROVIDER_ALLOWED_REGISTERED)).
-                        putString(Provider.KEY + "." + providerDomain, providerJson.toString()).commit();
-                result.putBoolean(RESULT_KEY, true);
-            } catch (JSONException e) {
-                String reason_to_fail = pickErrorMessage(providerDotJsonString);
-                result.putString(ERRORS, reason_to_fail);
-                result.putBoolean(RESULT_KEY, false);
+        if (!isValidJson(providerDotJsonString)) {
+            result.putString(ERRORS, resources.getString(malformed_url));
+            result.putBoolean(BROADCAST_RESULT_KEY, false);
+            return result;
+        }
+
+        try {
+            JSONObject providerJson = new JSONObject(providerDotJsonString);
+
+            if (provider.define(providerJson)) {
+                result.putBoolean(BROADCAST_RESULT_KEY, true);
+            } else {
+                return setErrorResult(result, warning_corrupted_provider_details, ERROR_CORRUPTED_PROVIDER_JSON.toString());
             }
+
+            result.putBoolean(BROADCAST_RESULT_KEY, true);
+        } catch (JSONException e) {
+            String reason_to_fail = pickErrorMessage(providerDotJsonString);
+            result.putString(ERRORS, reason_to_fail);
+            result.putBoolean(BROADCAST_RESULT_KEY, false);
         }
+        result.putParcelable(PROVIDER_KEY, provider);
         return result;
     }
 
     /**
      * Downloads the eip-service.json from a given URL, and saves eip service capabilities including the offered gateways
-     * @return a bundle with a boolean value mapped to a key named RESULT_KEY, and which is true if the download was successful.
+     * @return a bundle with a boolean value mapped to a key named BROADCAST_RESULT_KEY, and which is true if the download was successful.
      */
     @Override
-    protected Bundle getAndSetEipServiceJson() {
+    protected Bundle getAndSetEipServiceJson(Provider provider) {
         Bundle result = new Bundle();
-        String eip_service_json_string = "";
-        if (go_ahead) {
-            try {
-                JSONObject provider_json = new JSONObject(preferences.getString(Provider.KEY, ""));
-                String eip_service_url = provider_json.getString(Provider.API_URL) + "/" + provider_json.getString(Provider.API_VERSION) + "/" + EIP.SERVICE_API_PATH;
-                eip_service_json_string = downloadWithProviderCA(eip_service_url, lastDangerOn);
-                JSONObject eip_service_json = new JSONObject(eip_service_json_string);
-                eip_service_json.getInt(Provider.API_RETURN_SERIAL);
-
-                preferences.edit().putString(PROVIDER_KEY, eip_service_json.toString()).commit();
-
-                result.putBoolean(RESULT_KEY, true);
-            } catch (NullPointerException | JSONException e) {
-                String reason_to_fail = pickErrorMessage(eip_service_json_string);
-                result.putString(ERRORS, reason_to_fail);
-                result.putBoolean(RESULT_KEY, false);
+        String eipServiceJsonString = "";
+        try {
+            JSONObject providerDefinition = provider.getDefinition();
+            String eipServiceUrl = providerDefinition.getString(Provider.API_URL) + "/" + providerDefinition.getString(Provider.API_VERSION) + "/" + EIP.SERVICE_API_PATH;
+            eipServiceJsonString = downloadWithProviderCA(provider.getCaCert(), eipServiceUrl, lastDangerOn);
+
+            JSONObject eipServiceJson = new JSONObject(eipServiceJsonString);
+
+            if (eipServiceJson.has(ERRORS)) {
+                String reasonToFail = pickErrorMessage(eipServiceJsonString);
+                result.putString(ERRORS, reasonToFail);
+                result.putBoolean(BROADCAST_RESULT_KEY, false);
+            } else{
+                provider.setEipServiceJson(eipServiceJson);
+                result.putBoolean(BROADCAST_RESULT_KEY, true);
             }
+        } catch (NullPointerException | JSONException e) {
+            String reasonToFail = pickErrorMessage(eipServiceJsonString);
+            result.putString(ERRORS, reasonToFail);
+            result.putBoolean(BROADCAST_RESULT_KEY, false);
         }
+        result.putParcelable(PROVIDER_KEY, provider);
         return result;
     }
 
@@ -224,19 +201,19 @@ public class ProviderApiManager extends ProviderApiManagerBase {
      * @return true if certificate was downloaded correctly, false if provider.json is not present in SharedPreferences, or if the certificate url could not be parsed as a URI, or if there was an SSL error.
      */
     @Override
-    protected boolean updateVpnCertificate() {
+    protected boolean updateVpnCertificate(Provider provider) {
         try {
-            JSONObject provider_json = new JSONObject(preferences.getString(Provider.KEY, ""));
+            JSONObject providerDefinition = provider.getDefinition();
 
-            String provider_main_url = provider_json.getString(Provider.API_URL);
-            URL new_cert_string_url = new URL(provider_main_url + "/" + provider_json.getString(Provider.API_VERSION) + "/" + PROVIDER_VPN_CERTIFICATE);
+            String providerMainUrl = providerDefinition.getString(Provider.API_URL);
+            URL newCertStringUrl = new URL(providerMainUrl + "/" + providerDefinition.getString(Provider.API_VERSION) + "/" + PROVIDER_VPN_CERTIFICATE);
 
-            String cert_string = downloadWithProviderCA(new_cert_string_url.toString(), lastDangerOn);
+            String certString = downloadWithProviderCA(provider.getCaCert(), newCertStringUrl.toString(), lastDangerOn);
 
-            if (cert_string == null || cert_string.isEmpty() || ConfigHelper.checkErroneousDownload(cert_string))
+            if (certString == null || certString.isEmpty() || ConfigHelper.checkErroneousDownload(certString))
                 return false;
             else
-                return loadCertificate(cert_string);
+                return loadCertificate(provider, certString);
         } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
@@ -249,19 +226,18 @@ public class ProviderApiManager extends ProviderApiManagerBase {
     }
 
 
-    private Bundle downloadCACert(boolean dangerOn) {
+    private Bundle downloadCACert(Provider provider, boolean dangerOn) {
         Bundle result = new Bundle();
         try {
-            JSONObject providerJson = new JSONObject(preferences.getString(Provider.KEY, ""));
-            String caCertUrl = providerJson.getString(Provider.CA_CERT_URI);
-            String providerDomain = providerJson.getString(Provider.DOMAIN);
+            String caCertUrl = provider.getDefinition().getString(Provider.CA_CERT_URI);
+            String providerDomain = provider.getDomain();
 
             String certString = downloadWithCommercialCA(caCertUrl, dangerOn);
 
-            if (validCertificate(certString) && go_ahead) {
-                preferences.edit().putString(Provider.CA_CERT, certString).commit();
-                preferences.edit().putString(Provider.CA_CERT + "." + providerDomain, certString).commit();
-                result.putBoolean(RESULT_KEY, true);
+            if (validCertificate(provider, certString)) {
+                provider.setCaCert(certString);
+                preferences.edit().putString(Provider.CA_CERT + "." + providerDomain, certString).apply();
+                result.putBoolean(BROADCAST_RESULT_KEY, true);
             } else {
                 setErrorResult(result, warning_corrupted_provider_cert, ERROR_CERTIFICATE_PINNING.toString());
             }
@@ -275,13 +251,13 @@ public class ProviderApiManager extends ProviderApiManagerBase {
     /**
      * Tries to download the contents of the provided url using commercially validated CA certificate from chosen provider.
      * <p/>
-     * If danger_on flag is true, SSL exceptions will be managed by futher methods that will try to use some bypass methods.
+     * If dangerOn flag is true, SSL exceptions will be managed by futher methods that will try to use some bypass methods.
      *
-     * @param string_url
-     * @param danger_on  if the user completely trusts this provider
+     * @param stringUrl
+     * @param dangerOn  if the user completely trusts this provider
      * @return
      */
-    private String downloadWithCommercialCA(String string_url, boolean danger_on) {
+    private String downloadWithCommercialCA(String stringUrl, boolean dangerOn) {
         String responseString;
         JSONObject errorJson = new JSONObject();
 
@@ -292,14 +268,14 @@ public class ProviderApiManager extends ProviderApiManagerBase {
 
         List<Pair<String, String>> headerArgs = getAuthorizationHeader();
 
-        responseString = sendGetStringToServer(string_url, headerArgs, okHttpClient);
+        responseString = sendGetStringToServer(stringUrl, headerArgs, okHttpClient);
 
         if (responseString != null && responseString.contains(ERRORS)) {
             try {
                 // try to download with provider CA on certificate error
                 JSONObject responseErrorJson = new JSONObject(responseString);
-                if (danger_on && responseErrorJson.getString(ERRORS).equals(resources.getString(R.string.certificate_error))) {
-                    responseString = downloadWithoutCA(string_url);
+                if (dangerOn && responseErrorJson.getString(ERRORS).equals(resources.getString(R.string.certificate_error))) {
+                    responseString = downloadWithoutCA(stringUrl);
                 }
             } catch (JSONException e) {
                 e.printStackTrace();
@@ -313,7 +289,7 @@ public class ProviderApiManager extends ProviderApiManagerBase {
         String responseString;
         JSONObject errorJson = new JSONObject();
         String baseUrl = getApiUrl(providerDefinition);
-        OkHttpClient okHttpClient = clientGenerator.initSelfSignedCAHttpClient(errorJson, caCert);
+        OkHttpClient okHttpClient = clientGenerator.initSelfSignedCAHttpClient(caCert, errorJson);
         if (okHttpClient == null) {
             return errorJson.toString();
         }
@@ -344,11 +320,11 @@ public class ProviderApiManager extends ProviderApiManagerBase {
      * @param dangerOn  true to download CA certificate in case it has not been downloaded.
      * @return an empty string if it fails, the url content if not.
      */
-    private String downloadWithProviderCA(String urlString, boolean dangerOn) {
+    private String downloadWithProviderCA(String caCert, String urlString, boolean dangerOn) {
         JSONObject initError = new JSONObject();
         String responseString;
 
-        OkHttpClient okHttpClient = clientGenerator.initSelfSignedCAHttpClient(initError);
+        OkHttpClient okHttpClient = clientGenerator.initSelfSignedCAHttpClient(caCert, initError);
         if (okHttpClient == null) {
             return initError.toString();
         }
@@ -376,7 +352,7 @@ public class ProviderApiManager extends ProviderApiManagerBase {
      * Downloads the string that's in the url with any certificate.
      */
     // This method is totally insecure anyways. So no need to refactor that in order to use okHttpClient, force modern TLS etc.. DO NOT USE IN PRODUCTION!
-    private String downloadWithoutCA(String url_string) {
+    private String downloadWithoutCA(String urlString) {
         String string = "";
         try {
 
@@ -406,7 +382,7 @@ public class ProviderApiManager extends ProviderApiManagerBase {
             SSLContext context = SSLContext.getInstance("TLS");
             context.init(new KeyManager[0], new TrustManager[]{new DefaultTrustManager()}, new SecureRandom());
 
-            URL url = new URL(url_string);
+            URL url = new URL(urlString);
             HttpsURLConnection urlConnection = (HttpsURLConnection) url.openConnection();
             urlConnection.setSSLSocketFactory(context.getSocketFactory());
             urlConnection.setHostnameVerifier(hostnameVerifier);
diff --git a/app/src/insecure/java/se/leap/bitmaskclient/ProviderDetailActivity.java b/app/src/insecure/java/se/leap/bitmaskclient/ProviderDetailActivity.java
index 6977753f..cf9ee5f5 100644
--- a/app/src/insecure/java/se/leap/bitmaskclient/ProviderDetailActivity.java
+++ b/app/src/insecure/java/se/leap/bitmaskclient/ProviderDetailActivity.java
@@ -2,15 +2,12 @@ package se.leap.bitmaskclient;
 
 import android.content.SharedPreferences;
 
-import static se.leap.bitmaskclient.Constants.PROVIDER_ALLOW_ANONYMOUS;
-import static se.leap.bitmaskclient.Constants.PROVIDER_KEY;
-
 public class ProviderDetailActivity extends AbstractProviderDetailActivity {
 
     @Override
     public void onBackPressed() {
         SharedPreferences.Editor editor = preferences.edit();
-        editor.remove(Provider.KEY).remove(ProviderListContent.ProviderItem.DANGER_ON).remove(PROVIDER_ALLOW_ANONYMOUS).remove(PROVIDER_KEY).apply();
+        editor.remove(ProviderListContent.ProviderItem.DANGER_ON).apply();
         super.onBackPressed();
     }
 
diff --git a/app/src/insecure/java/se/leap/bitmaskclient/ProviderListActivity.java b/app/src/insecure/java/se/leap/bitmaskclient/ProviderListActivity.java
index 823b5635..5ad7ea44 100644
--- a/app/src/insecure/java/se/leap/bitmaskclient/ProviderListActivity.java
+++ b/app/src/insecure/java/se/leap/bitmaskclient/ProviderListActivity.java
@@ -16,8 +16,8 @@
  */
 package se.leap.bitmaskclient;
 
-import android.content.Intent;
 import android.os.Bundle;
+import android.support.annotation.NonNull;
 import android.support.v4.app.DialogFragment;
 import android.support.v4.app.FragmentTransaction;
 
@@ -26,6 +26,8 @@ import java.net.URL;
 
 import se.leap.bitmaskclient.ProviderListContent.ProviderItem;
 
+import static se.leap.bitmaskclient.ProviderAPI.SET_UP_PROVIDER;
+
 /**
  * Activity that builds and shows the list of known available providers.
  * <p/>
@@ -51,12 +53,12 @@ public class ProviderListActivity extends ProviderListBaseActivity {
     /**
      * Open the new provider dialog with data
      */
-    public void addAndSelectNewProvider(String main_url, boolean danger_on) {
+    public void addAndSelectNewProvider(String mainUrl, boolean danger_on) {
         FragmentTransaction fragment_transaction = fragmentManager.removePreviousFragment(NewProviderDialog.TAG);
 
         DialogFragment newFragment = new NewProviderDialog();
         Bundle data = new Bundle();
-        data.putString(Provider.MAIN_URL, main_url);
+        data.putString(Provider.MAIN_URL, mainUrl);
         data.putBoolean(ProviderItem.DANGER_ON, danger_on);
         newFragment.setArguments(data);
         newFragment.show(fragment_transaction, NewProviderDialog.TAG);
@@ -87,46 +89,19 @@ public class ProviderListActivity extends ProviderListBaseActivity {
      */
     public void setUpProvider(boolean danger_on) {
         mConfigState.setAction(SETTING_UP_PROVIDER);
-        Intent providerAPICommand = new Intent(this, ProviderAPI.class);
+
         Bundle parameters = new Bundle();
-        parameters.putString(Provider.MAIN_URL, provider.getMainUrl().toString());
         parameters.putBoolean(ProviderItem.DANGER_ON, danger_on);
-        if (provider.hasCertificatePin()){
-            parameters.putString(Provider.CA_CERT_FINGERPRINT, provider.certificatePin());
-        }
-        if (provider.hasCaCert()) {
-            parameters.putString(Provider.CA_CERT, provider.getCaCert());
-        }
-        if (provider.hasDefinition()) {
-            parameters.putString(Provider.KEY, provider.getDefinition().toString());
-        }
 
-        providerAPICommand.setAction(ProviderAPI.SET_UP_PROVIDER);
-        providerAPICommand.putExtra(ProviderAPI.PARAMETERS, parameters);
-
-        startService(providerAPICommand);
+        ProviderAPICommand.execute(this, SET_UP_PROVIDER, parameters, provider);
     }
 
     /**
      * Retrys setup of last used provider, allows bypassing ca certificate validation.
      */
     @Override
-    public void retrySetUpProvider() {
-        cancelSettingUpProvider();
-        if (!ProviderAPI.caCertDownloaded()) {
-            addAndSelectNewProvider(ProviderAPI.lastProviderMainUrl(), ProviderAPI.lastDangerOn());
-        } else {
-            showProgressBar();
-
-            Intent providerAPICommand = new Intent(this, ProviderAPI.class);
-
-            providerAPICommand.setAction(ProviderAPI.SET_UP_PROVIDER);
-            Bundle parameters = new Bundle();
-            parameters.putString(Provider.MAIN_URL, provider.getMainUrl().toString());
-            providerAPICommand.putExtra(ProviderAPI.PARAMETERS, parameters);
-
-            startService(providerAPICommand);
-        }
+    public void retrySetUpProvider(@NonNull Provider provider) {
+        ProviderAPICommand.execute(this, SET_UP_PROVIDER, provider);
     }
 
 }