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Use cases for Sling servlet filter

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Level 7

Hello Everyone,

 

Anyone used Sling servlet filter in your application?  Wanted to know about the use cases.

I have found out this link:https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/sling-servlet-filter/m-p/4...

But, wanted to know more about real time use cases of this feature.

 

- Thanks

Mahesh Gunaje

1 Accepted Solution

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Correct answer by
Community Advisor

Hello @Mahesh_Gunaje 

 

Here are some common use cases for Sling Filters in AEM:

1. Request Modification: Sling Filters can be used to modify incoming HTTP requests before they are processed by the servlet. This can involve adding or removing request parameters, headers, or attributes, URL rewriting, or any other form of request manipulation needed for processing.

 

2. Authentication and Authorization: Sling Filters are often used for implementing custom authentication and authorization mechanisms. For example, you can use a filter to enforce authentication requirements for certain URLs or to check user permissions before allowing access to resources.

 

3. Request Logging: Sling Filters can be employed to log information about incoming requests, such as request parameters, headers, user agents, or IP addresses. This can be helpful for auditing, debugging, or monitoring purposes.

 

4. Caching: Sling Filters can be used to implement caching strategies, such as caching responses to improve performance. Filters can intercept requests and serve cached responses directly without hitting the underlying servlet if certain conditions are met.

 

5. Request Validation: Sling Filters can validate incoming requests to ensure they meet certain criteria or adhere to specific rules. For example, you can use a filter to validate form submissions, check for the presence of required parameters, or sanitize input data to prevent security vulnerabilities like cross-site scripting (XSS) attacks.

 

6. Content Transformation: Filters can transform the content of incoming requests or outgoing responses. For instance, you can modify the content type, compress or decompress data, or translate content to a different format based on client preferences.

 

7. Error Handling: Sling Filters can handle errors or exceptions that occur during request processing. They can customize error responses, log error information, or perform any necessary cleanup actions.

 

8. Security: Filters can enforce security policies by inspecting and validating incoming requests for potential security threats. Example: if you are only accepting requests from an IP. Prefer using IP blocking on CDN for this use case.


Aanchal Sikka

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Level 5

@Mahesh_Gunaje 

One of the use cases here would be to check authentication.

For certain pages which needed authentication, sling filters can be used to check if user is logged in or else redirect to login page

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Correct answer by
Community Advisor

Hello @Mahesh_Gunaje 

 

Here are some common use cases for Sling Filters in AEM:

1. Request Modification: Sling Filters can be used to modify incoming HTTP requests before they are processed by the servlet. This can involve adding or removing request parameters, headers, or attributes, URL rewriting, or any other form of request manipulation needed for processing.

 

2. Authentication and Authorization: Sling Filters are often used for implementing custom authentication and authorization mechanisms. For example, you can use a filter to enforce authentication requirements for certain URLs or to check user permissions before allowing access to resources.

 

3. Request Logging: Sling Filters can be employed to log information about incoming requests, such as request parameters, headers, user agents, or IP addresses. This can be helpful for auditing, debugging, or monitoring purposes.

 

4. Caching: Sling Filters can be used to implement caching strategies, such as caching responses to improve performance. Filters can intercept requests and serve cached responses directly without hitting the underlying servlet if certain conditions are met.

 

5. Request Validation: Sling Filters can validate incoming requests to ensure they meet certain criteria or adhere to specific rules. For example, you can use a filter to validate form submissions, check for the presence of required parameters, or sanitize input data to prevent security vulnerabilities like cross-site scripting (XSS) attacks.

 

6. Content Transformation: Filters can transform the content of incoming requests or outgoing responses. For instance, you can modify the content type, compress or decompress data, or translate content to a different format based on client preferences.

 

7. Error Handling: Sling Filters can handle errors or exceptions that occur during request processing. They can customize error responses, log error information, or perform any necessary cleanup actions.

 

8. Security: Filters can enforce security policies by inspecting and validating incoming requests for potential security threats. Example: if you are only accepting requests from an IP. Prefer using IP blocking on CDN for this use case.


Aanchal Sikka