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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "hash/crc32" | ||
| "log" | ||
| "math/bits" | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| typev3 "github.com/envoyproxy/go-control-plane/envoy/type/v3" | ||
| ep "github.com/wrossmorrow/envoy-extproc-sdk-go" | ||
| ) | ||
|
|
||
| const ( | ||
| kCRC = "crc32" | ||
| kData = "data" | ||
| kPoly = "poly" | ||
| ) | ||
|
|
||
| type crc32CheckRequestProcessor struct { | ||
| opts *ep.ProcessingOptions | ||
| poly uint32 | ||
| } | ||
|
|
||
| func (s *crc32CheckRequestProcessor) GetName() string { | ||
| return "crc32-check" | ||
| } | ||
|
|
||
| func (s *crc32CheckRequestProcessor) GetOptions() *ep.ProcessingOptions { | ||
| return s.opts | ||
| } | ||
|
|
||
| func (s *crc32CheckRequestProcessor) ProcessRequestHeaders(ctx *ep.RequestContext, headers ep.AllHeaders) error { | ||
| return ctx.ContinueRequest() | ||
| } | ||
|
|
||
| func extract(m map[string]any, k string) string { | ||
| vv, ok := m[k] | ||
| if ok { | ||
| return vv.(string) | ||
| } | ||
| return "" | ||
| } | ||
|
|
||
| func (s *crc32CheckRequestProcessor) crc(input []byte) uint32 { | ||
| revPoly := bits.Reverse32(s.poly) | ||
| t := crc32.MakeTable(revPoly) | ||
| return crc32.Checksum(input, t) | ||
| } | ||
|
|
||
| func (s *crc32CheckRequestProcessor) ProcessRequestBody(ctx *ep.RequestContext, body []byte) error { | ||
| cancel := func(code int32) error { | ||
| return ctx.CancelRequest(code, map[string]ep.HeaderValue{}, typev3.StatusCode_name[code]) | ||
| } | ||
|
|
||
| var unstructure map[string]any | ||
|
|
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| err := json.Unmarshal(body, &unstructure) | ||
| if err != nil { | ||
| log.Printf("parse the request is failed: %v", err.Error()) | ||
| return cancel(400) | ||
| } | ||
|
|
||
| actual, _ := strconv.ParseUint(extract(unstructure, kCRC), 16, 32) | ||
|
|
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| want := s.crc([]byte(extract(unstructure, kData))) | ||
| if want != uint32(actual) { | ||
| log.Printf("verify the checksum is failed, want=0x%0x actual=0x%0x", want, actual) | ||
| return cancel(403) | ||
| } | ||
|
|
||
| return ctx.ContinueRequest() | ||
| } | ||
|
|
||
| func (s *crc32CheckRequestProcessor) ProcessRequestTrailers(ctx *ep.RequestContext, trailers ep.AllHeaders) error { | ||
| return ctx.ContinueRequest() | ||
| } | ||
|
|
||
| func (s *crc32CheckRequestProcessor) ProcessResponseHeaders(ctx *ep.RequestContext, headers ep.AllHeaders) error { | ||
| return ctx.ContinueRequest() | ||
| } | ||
|
|
||
| func (s *crc32CheckRequestProcessor) ProcessResponseBody(ctx *ep.RequestContext, body []byte) error { | ||
| return ctx.ContinueRequest() | ||
| } | ||
|
|
||
| func (s *crc32CheckRequestProcessor) ProcessResponseTrailers(ctx *ep.RequestContext, trailers ep.AllHeaders) error { | ||
| return ctx.ContinueRequest() | ||
| } | ||
|
|
||
| func (s *crc32CheckRequestProcessor) Init(opts *ep.ProcessingOptions, nonFlagArgs []string) error { | ||
| s.opts = opts | ||
| s.poly = crc32.IEEE | ||
|
|
||
| var i int | ||
| nArgs := len(nonFlagArgs) | ||
| for ; i < nArgs-1; i++ { | ||
| if nonFlagArgs[i] == kPoly { | ||
| break | ||
| } | ||
| } | ||
|
|
||
| if i == nArgs { | ||
| log.Printf("the argument: 'poly' is missing, use the IEEE.\n") | ||
| } else { | ||
| polyStr := strings.ToLower(nonFlagArgs[i+1]) | ||
|
|
||
| if ok := strings.HasPrefix(polyStr, "0x"); ok && len(polyStr) > 2 { | ||
| polyStr = polyStr[2:] | ||
| } | ||
|
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| poly, _ := strconv.ParseInt(polyStr, 16, 64) | ||
| if poly == 0 { | ||
| log.Printf("parse the value for parameter: 'poly' is failed, use the IEEE.\n") | ||
| } else { | ||
| s.poly = uint32(poly) | ||
| log.Printf("the poly is: 0x%0x.\n", s.poly) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (s *crc32CheckRequestProcessor) Finish() {} |
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