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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| load("@prysm//tools/go:def.bzl", "go_library", "go_test") | ||
|
|
||
| go_library( | ||
| name = "go_default_library", | ||
| srcs = [ | ||
| "middleware.go", | ||
| "util.go", | ||
| ], | ||
| importpath = "github.com/prysmaticlabs/prysm/v5/api/server/middleware", | ||
| visibility = ["//visibility:public"], | ||
| deps = [ | ||
| "@com_github_gorilla_mux//:go_default_library", | ||
| "@com_github_rs_cors//:go_default_library", | ||
| ], | ||
| ) | ||
|
|
||
| go_test( | ||
| name = "go_default_test", | ||
| srcs = [ | ||
| "middleware_test.go", | ||
| "util_test.go", | ||
| ], | ||
| embed = [":go_default_library"], | ||
| deps = [ | ||
| "//api:go_default_library", | ||
| "//testing/assert:go_default_library", | ||
| "//testing/require:go_default_library", | ||
| ], | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| package middleware | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net/http" | ||
| "strings" | ||
|
|
||
| "github.com/gorilla/mux" | ||
| "github.com/rs/cors" | ||
| ) | ||
|
|
||
| // NormalizeQueryValuesHandler normalizes an input query of "key=value1,value2,value3" to "key=value1&key=value2&key=value3" | ||
| func NormalizeQueryValuesHandler(next http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| query := r.URL.Query() | ||
| NormalizeQueryValues(query) | ||
| r.URL.RawQuery = query.Encode() | ||
|
|
||
| next.ServeHTTP(w, r) | ||
| }) | ||
| } | ||
|
|
||
| // CorsHandler sets the cors settings on api endpoints | ||
| func CorsHandler(allowOrigins []string) mux.MiddlewareFunc { | ||
| c := cors.New(cors.Options{ | ||
| AllowedOrigins: allowOrigins, | ||
| AllowedMethods: []string{http.MethodPost, http.MethodGet, http.MethodDelete, http.MethodOptions}, | ||
| AllowCredentials: true, | ||
| MaxAge: 600, | ||
| AllowedHeaders: []string{"*"}, | ||
| }) | ||
|
|
||
| return c.Handler | ||
| } | ||
|
|
||
| // ContentTypeHandler checks request for the appropriate media types otherwise returning a http.StatusUnsupportedMediaType error | ||
| func ContentTypeHandler(acceptedMediaTypes []string) mux.MiddlewareFunc { | ||
| return func(next http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| // skip the GET request | ||
| if r.Method == http.MethodGet { | ||
| next.ServeHTTP(w, r) | ||
| return | ||
| } | ||
| contentType := r.Header.Get("Content-Type") | ||
| if contentType == "" { | ||
| http.Error(w, "Content-Type header is missing", http.StatusUnsupportedMediaType) | ||
| return | ||
| } | ||
|
|
||
| accepted := false | ||
| for _, acceptedType := range acceptedMediaTypes { | ||
| if strings.Contains(strings.TrimSpace(contentType), strings.TrimSpace(acceptedType)) { | ||
| accepted = true | ||
| break | ||
| } | ||
| } | ||
|
|
||
| if !accepted { | ||
| http.Error(w, fmt.Sprintf("Unsupported media type: %s", contentType), http.StatusUnsupportedMediaType) | ||
| return | ||
| } | ||
|
|
||
| next.ServeHTTP(w, r) | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| // AcceptHeaderHandler checks if the client's response preference is handled | ||
| func AcceptHeaderHandler(serverAcceptedTypes []string) mux.MiddlewareFunc { | ||
| return func(next http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| acceptHeader := r.Header.Get("Accept") | ||
| // header is optional and should skip if not provided | ||
| if acceptHeader == "" { | ||
| next.ServeHTTP(w, r) | ||
| return | ||
| } | ||
|
|
||
| accepted := false | ||
| acceptTypes := strings.Split(acceptHeader, ",") | ||
| // follows rules defined in https://datatracker.ietf.org/doc/html/rfc2616#section-14.1 | ||
| for _, acceptType := range acceptTypes { | ||
| acceptType = strings.TrimSpace(acceptType) | ||
| if acceptType == "*/*" { | ||
| accepted = true | ||
| break | ||
| } | ||
| for _, serverAcceptedType := range serverAcceptedTypes { | ||
| if strings.HasPrefix(acceptType, serverAcceptedType) { | ||
| accepted = true | ||
| break | ||
| } | ||
| if acceptType != "/*" && strings.HasSuffix(acceptType, "/*") && strings.HasPrefix(serverAcceptedType, acceptType[:len(acceptType)-2]) { | ||
| accepted = true | ||
| break | ||
| } | ||
| } | ||
| if accepted { | ||
| break | ||
| } | ||
| } | ||
|
|
||
| if !accepted { | ||
| http.Error(w, fmt.Sprintf("Not Acceptable: %s", acceptHeader), http.StatusNotAcceptable) | ||
| return | ||
| } | ||
|
|
||
| next.ServeHTTP(w, r) | ||
| }) | ||
| } | ||
| } |
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