What this filter does

Simulates handling authentication of requests at proxy level. Requests with a header token with value hello are accepted as authorized while the rest unauthorized. The actual authentication is handled by the Upstream server. Whenever the proxy recieves a request it extracts the token header and makes a request to the Upstream server which validates the token and returns a response.

Caveats and Considerations

Test:
curl -H "token":"hello" 0.0.0.0:18000 -v # Authorized
curl -H "token":"world" 0.0.0.0:18000 -v # Unauthorized

Technologies

What this filter does

Collects simple metrics for every TCP packet and logs it.

Caveats and Considerations

Test:curl 0.0.0.0:18000 -v -d "request body"

Check the logs for the metrics.

Technologies

What this filter does

Parses the contents of every TCP packet the proxy receives and logs it.

Caveats and Considerations

Test:
curl 0.0.0.0:18000 -v -d "request body"

Check the logs for the packet contents.

Technologies

What this filter does

The filter is responsible for intercepting HTTP requests, authorizing them based on the stored cache, and performing rate limiting. In the context of the envoy, this component is an HTTP filter and gets executed in the worker threads. For each request, a context object gets created.

Caveats and Considerations

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Technologies

What this filter does

This example showcases communication between a WASM filter and a service via shared queue. It combines the `Singleton-HTTP-Call` and `TCP-Metrics` examples. The filter collects metrics and enqueues it onto the queue while the service dequeues it and sends it to upstream server where it is stored.

Caveats and Considerations

Test:curl 0.0.0.0:18000 -v -d "request body" # make a few of these calls
curl 0.0.0.0:8080/retrieve -v # Retrieves the stored stats
# x | y | z === x : downstream bytes, y : upstream bytes, z: the latency for application server to respond

Technologies

What this filter does

An example which depicts an singleton HTTP WASM service which does an HTTP call once every 2 seconds.

Caveats and Considerations

Check the logs for the response of the request.

Technologies

What this filter does

Sample configuration to be passed:{
"add_header": [
["header1","value1"],
["header2","value2"]
],
"del_header":[
"header1"
],
"add_payload": [
["payload1","value1"],
["payload2","value2"],
],
"del_payload":[
"payload1"
],
"payload_to_header": [
"payload2"
],
"header_to_payload": [
"header2"
]
}

Caveats and Considerations

DISCLAIMER: This filter doesn't regenerate the signature of the modified JWT, and provides no protections. Proceed with caution.

Technologies