diff --git a/scripts/rules.go b/scripts/rules.go
index 35bb9e86dd2c4..1d83dd2315bf3 100644
--- a/scripts/rules.go
+++ b/scripts/rules.go
@@ -17,6 +17,7 @@ package gorules
import (
"github.com/quasilyte/go-ruleguard/dsl"
+ "github.com/quasilyte/go-ruleguard/dsl/types"
)
// Use xerrors everywhere! It provides additional stacktrace info!
@@ -238,3 +239,30 @@ func ProperRBACReturn(m dsl.Matcher) {
}
`).Report("Must write to 'ResponseWriter' before returning'")
}
+
+// FullResponseWriter ensures that any overridden response writer has full
+// functionality. Mainly is hijackable and flushable.
+func FullResponseWriter(m dsl.Matcher) {
+ m.Match(`
+ type $w struct {
+ $*_
+ http.ResponseWriter
+ $*_
+ }
+ `).
+ At(m["w"]).
+ Where(m["w"].Filter(notImplementsFullResponseWriter)).
+ Report("ResponseWriter \"$w\" must implement http.Flusher and http.Hijacker")
+}
+
+// notImplementsFullResponseWriter returns false if the type does not implement
+// http.Flusher, http.Hijacker, and http.ResponseWriter.
+func notImplementsFullResponseWriter(ctx *dsl.VarFilterContext) bool {
+ flusher := ctx.GetInterface(`net/http.Flusher`)
+ hijacker := ctx.GetInterface(`net/http.Hijacker`)
+ writer := ctx.GetInterface(`net/http.ResponseWriter`)
+ p := types.NewPointer(ctx.Type)
+ return !(types.Implements(p, writer) || types.Implements(ctx.Type, writer)) ||
+ !(types.Implements(p, flusher) || types.Implements(ctx.Type, flusher)) ||
+ !(types.Implements(p, hijacker) || types.Implements(ctx.Type, hijacker))
+}
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