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• How to verify user permissions – Introducing the Piwik Platform

  9 novembre 2014, par Thomas Steur — Development

  This is the next post of our blog series where we introduce the capabilities of the Piwik platform (our previous post was How to make your plugin multilingual). This time you’ll learn how to verify user permissions. For this tutorial you will need to have basic knowledge of PHP and the Piwik platform.

  When should a plugin verify permissions ?

  Usually you want to do this before executing any action – such as deleting or fetching data – and before rendering any sensitive information that should not be accessible by everyone. For instance in an API method or Controller action. You sometimes also need to verify permissions before registering menu items or widgets.

  How does Piwik’s user management work ?

  It is quite simple as it only differentiates between a few roles : View permission, Admin permission and Super User permission. If you manage multiple websites with Piwik a user can be assigned to different roles as a user might have no permission for some websites but view or admin permission for another set of websites.

  Worth mentioning is that roles inherit from each other. This means the role admin automatically includes the role view and a super user automatically covers the view and admin role.

  Getting started

  In this post, we assume that you have already set up your development environment and created a plugin. If not, visit the Piwik Developer Zone where you’ll find the tutorial Setting up Piwik and other Guides that help you to develop a plugin.

  Verifying user permissions

  To protect your data the platform offers many convenient methods in the \Piwik\Piwik class. There you will find methods that either start with check, is or has. While methods that start with check throw an exception in case a condition is not met, the other methods return a boolean true or false.

  Use methods that throw an exception if you want to stop any further execution in case a user does not have an appropriate role. The platform will catch the exception and display an error message or ask the user to log in.

  public function deleteAllMessages()
  {
      // delete messages only if user has super user access, otherwise show an error message
      Piwik::checkUserSuperUserAccess();
   
      $this->getModel()->deleteAllMessages();
  }
  Télécharger

  Use methods that return a boolean for instance when registering menu items or widgets.

  public function configureAdminMenu(MenuAdmin $menu)
  {
      if (Piwik::hasUserSuperUserAccess()) {
          $menu->addPlatformItem('Plugins', $this->urlForDefaultAction());
      }
  }
  Télécharger

  It is important to be aware that just because the menu item won’t be displayed in the UI a user can still open the registered URL manually. Therefore you have to check for permissions in the actual controller action as well.

  View permission

  A user having a view permission should be only able to view reports but not make any changes apart from his personal settings. The methods that end with UserHasSomeViewAccess make sure a user has at least view permission for one website whereas the methods *UserHasViewAccess($idSites = array(1,2,3)) check whether a user has view access for all of the given websites.

  Piwik::checkUserHasSomeViewAccess();
   
  Piwik::checkUserHasViewAccess($idSites = array(1,2,3));
  Télécharger

  As a plugin developer you would usually use the latter example to verify the permissions for specific websites. Use the first example in case you develop something like an “All Websites Dashboard” where you only want to make sure the user has a view permission for at least one website.

  Admin permission

  A user having an admin permission cannot only view reports but also change website related settings. The methods to check for this role are similar to the ones before, just swap the term View with Admin.

  Piwik::checkUserHasSomeAdminAccess();
   
  Piwik::checkUserHasAdminAccess($idSites = array(1,2,3));
  Télécharger

  Super user permission

  A user having the super user permission is allowed to access all of the data stored in Piwik and change any settings. To check if a user has this role use one of the methods that end with UserSuperUserAccess.

  Piwik::checkUserHasSuperUserAccess();

  As a plugin developer you would check for this permission for instance in places where your plugin shows an activity log over all users or where it offers the possibility to change any system wide settings.

  Getting information about the currently logged in user

  Sometimes you might want to know which user is currently logged in. This can be useful if you want to persist user related information in the database or if you want to send an email to the currently logged in user. You can easily get this information by calling the following methods :

  $login = Piwik::getCurrentUserLogin()
  $email = Piwik::getCurrentUserEmail()
  Télécharger

  Advanced features

  Of course there is more that you can do. For instance you can verify whether a user is an anonymous user or whether a user has a specific role. You can also perform any operation in the context of a super user even if the current user does not have this role. Would you like to know more about those features ? Check out the Piwik class reference, the Security guide and the Manage Users user guide.

  If you have any feedback regarding our APIs or our guides in the Developer Zone feel free to send it to us.

• why am i getting this error when using FFmpeg in a spring boot app on a mac intel device : SIGSEGV (0xb) at pc=0x000000013d71b0e0, pid=49777, tid=42755

  19 juillet 2024, par Godwill Christopher

  I am working with FFmpeg library in spring boot app to stream live recording from an ip camera via RSTP and save to S3 bucket but i am running into the error below.

  


  A fatal error has been detected by the Java Runtime Environment :

  


  SIGSEGV (0xb) at pc=0x000000013d71b0e0, pid=49777, tid=42755

  


  JRE version : OpenJDK Runtime Environment Corretto-19.0.2.7.1 (19.0.2+7) (build 19.0.2+7-FR)
Java VM : OpenJDK 64-Bit Server VM Corretto-19.0.2.7.1 (19.0.2+7-FR, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, bsd-amd64)
Problematic frame :
C [libavutil.56.dylib+0xa0e0] av_strstart+0x10

  


  No core dump will be written. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
An error report file with more information is saved as :
/Users/CODA/Desktop/videoSaleService/hs_err_pid49777.log

  


  If you would like to submit a bug report, please visit :
https://github.com/corretto/corretto-19/issues/
The crash happened outside the Java Virtual Machine in native code.
See problematic frame for where to report the bug.

  


  Process finished with exit code 134 (interrupted by signal 6:SIGABRT)

  


  public static void main(String[] args) {
    OkHttpClient client = new OkHttpClient();
    try (S3Client s3Client = S3Client.create()) {
        VideoService videoService = new VideoService(new VideoRepositoryImpl(),
                new S3Service(s3Client), new VideoExtractor(client), new ISApiClient());
        videoService.streamLiveVideoRSTP(System.out);
    } catch (IOException e) {
        log.error("Error occurred while streaming live video: {}", e.getMessage(), e);
    } catch (Exception e) {
        log.error("Unexpected error occurred: {}", e.getMessage(), e);
    }
}

public void streamLiveVideoRSTP(OutputStream outputStream) throws IOException {
    File tempFile = File.createTempFile("live_stream", ".mp4");

    try (InputStream inputStream = client.getLiveStreamingVideoRSTP();
         OutputStream fileOutputStream = new FileOutputStream(tempFile)) {
        byte[] buffer = new byte[4096];
        int bytesRead;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
            fileOutputStream.write(buffer, 0, bytesRead);
        }
    } catch (Exception e) {
        log.error("Error occurred while streaming live video: {}", e.getMessage(), e);
        throw new IOException("Error occurred while streaming live video", e);
    }

    // Upload the captured video file to S3
    try {
        uploadStreamedVideoToS3(tempFile);
    } finally {
        if (tempFile.exists()) {
            if (!tempFile.delete()) {
                log.warn("Failed to delete temporary file: {}", tempFile.getAbsolutePath());
            }
        }
    }
}

private final BlockingQueue frameQueue = new ArrayBlockingQueue<>(10);

public ISApiClient() {
    new Thread(this::startGrabbingFrames).start();
}

public InputStream getLiveStreamingVideoRSTP() {
    return new InputStream() {
        private ByteArrayInputStream currentStream;

        @Override
        public int read() {
            if (currentStream == null || currentStream.available() == 0) {
                byte[] frame = frameQueue.poll();
                if (frame != null) {
                    currentStream = new ByteArrayInputStream(frame);
                } else {
                    return -1;
                }
            }
            return currentStream.read();
        }
    };
}

private void startGrabbingFrames() {
    try (FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber(rtspUrl)) {
        frameGrabber.setOption("rtsp_transport", "tcp");
        frameGrabber.start();

        FFmpegFrameFilter frameFilter = new FFmpegFrameFilter("format=yuv420p",
                frameGrabber.getImageWidth(), frameGrabber.getImageHeight());
        frameFilter.setPixelFormat(frameGrabber.getPixelFormat());
        frameFilter.start();

        log.info("Started grabbing frames from RTSP stream.");

        while (true) {
            Frame frame = frameGrabber.grab();
            if (frame != null && frame.image != null) {
                log.info("Frame grabbed: width={} height={} timestamp={}",
                        frame.imageWidth, frame.imageHeight, frame.timestamp);
                frameFilter.push(frame);
                Frame filteredFrame = frameFilter.pull();

                if (filteredFrame != null && filteredFrame.image != null) {
                    log.info("Frame filtered: width={} height={} timestamp={}",
                            filteredFrame.imageWidth, filteredFrame.imageHeight, filteredFrame.timestamp);
                    byte[] imageBytes = convertFrameToBytes(filteredFrame);
                    if (imageBytes.length > 0) {
                        frameQueue.offer(imageBytes);
                        log.info("Frame added to queue, queue size={}", frameQueue.size());
                    }
                }
            }
        }
    } catch (IOException e) {
        log.error("Error grabbing frames: {}", e.getMessage(), e);
    }
}

private byte[] convertFrameToBytes(Frame frame) {
    if (frame == null || frame.image == null) {
        return new byte[0];
    }

    ByteBuffer byteBuffer = null;
    for (Object img : frame.image) {
        if (img instanceof ByteBuffer) {
            byteBuffer = (ByteBuffer) img;
            break;
        }
    }

    if (byteBuffer == null) {
        return new byte[0];
    }

    byte[] bytes = new byte[byteBuffer.remaining()];
    byteBuffer.get(bytes);
    return bytes;
}


  


• Generating test data – Introducing the Piwik Platform

  9 octobre 2014, par Thomas Steur — Development

  This is the next post of our blog series where we introduce the capabilities of the Piwik platform (our previous post was How to create a command). This time you’ll learn how to generate test data.

  Developers are developing on their local Piwik instance which usually does not contain useful data compared to a real Piwik installation in production (only a few test visits and a few tests users and websites). The ‘VisitorGenerator’ plugin lets you generate any number of visits, websites, users, goals and more. The generator makes sure there will be data for each report so you can easily test anything.

  Getting started

  In this series of posts, we assume that you have already installed Piwik. If not, visit the Piwik Developer Zone where you’ll find the Installation guide for developers.

  Installing the VisitorGenerator plugin

  The easiest way to install the plugin is by using the Marketplace in Piwik itself. It is accessible via Settings => Marketplace => Get new functionality. There you’ll find the plugin “VisitorGenerator” which you can install and activate in one click.

  If your Piwik instance is not connected to the internet you can download the plugin from the VisitorGenerator page on the Marketplace. Afterwards you can install the plugin by going to Settings => Marketplace => Uploading a plugin and uploading the previously downloaded ZIP file.

  If you have already installed the plugin make sure it is activated by going to Settings => Plugins.

  Generating websites

  After you have installed the plugin you can add as many websites as you need. This is useful for instance when you want to test something that affects many websites such as the ‘All Websites’ dashboard or the Websites manager. To generate any number of websites use the following command :

  ./console visitorgenerator:generate-website --limit=10

  This will generate 10 websites. If you need more websites simply specify a higher limit. In case you are wondering the names and URLs of the websites are randomly generated by the Faker PHP library.

  Generating goals

  In case you want to test anything related to Goals you should execute the following command :

  ./console visitorgenerator:generate-goals --idsite=1

  This will generate a few goals for the specified site. The generated goals are defined in a way to make sure there will be conversions when generating the visits in the next step.

  Generating visits

  To generate visits there are two possibilities. Either via the Piwik UI by going to Settings => Visitor Generator or by using the command line. The UI is a bit limited in generating visits so we recommend to use the command line. There you can generate visits as follows :

  ./console visitorgenerator:generate-visits --idsite=1

  This will generate many different visits for the current day. Don’t worry if it takes a while, it will insert quite a few visits by default.

  In case you want to generate visits for multiple days in the past as well you can specify the --days option.

  ./console visitorgenerator:generate-visits --idsite=1 --days=5

  Providing your own logs

  Half of the generated visits are randomly generated and half of the visits are based on real logs to make sure there is data for each report. If you want to generate visits based on your own logs for a more realistic testing just place your log files in the plugins/VisitorGenerator/data folder and make sure the file name ends with .log. You can find a few examples in the VisitorGenerator data folder.

  To generate visits based only on real log files then use the --no-fake option.

  ./console visitorgenerator:generate-visits --idsite=1 --no-fake

  All generated visits will come from the logs and no random visits nor random fake data will be used.

  Advanced features

  We are regularly adding new commands, tools and runtime checks to make your life as a developer easier. For instance you can also generate users and annotations. In the future we want to extend the plugin to create visits in the background to make sure there will be constantly new actions in the real time report.

  Are you missing any kind of generator or any other feature to make your life as a developer easier ? Let us know by email, we are listening !

  Would you like to know more about the Piwik platform ? Go to our Piwik Developer Zone where you’ll find guides and references on how to develop plugin and themes.