refactoring barak

cmd/barak/validate.go

@@ -0,0 +1,58 @@
+package main
+
+import acm "github.com/tendermint/tendermint/account"
+
+type Validator struct {
+	VotingPower uint64
+	PubKey      acm.PubKey
+}
+
+func validate(signBytes []byte, validators []Validator, signatures []acm.Signature) bool {
+	var signedPower uint64
+	var totalPower uint64
+	for i, val := range validators {
+		if val.PubKey.VerifyBytes(signBytes, signatures[i]) {
+			signedPower += val.VotingPower
+			totalPower += val.VotingPower
+		} else {
+			totalPower += val.VotingPower
+		}
+	}
+	return signedPower > totalPower*2/3
+}
+
+/*
+NOTE: Not used, just here in case we want it later.
+func ValidateHandler(handler http.Handler, validators []Validator) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		sigStrs := r.Header[http.CanonicalHeaderKey("signatures")]
+		log.Debug("Woot", "sigstrs", sigStrs, "len", len(sigStrs))
+		// from https://medium.com/@xoen/golang-read-from-an-io-readwriter-without-loosing-its-content-2c6911805361
+		// Read the content
+		var bodyBytes []byte
+		if r.Body != nil {
+			bodyBytes, _ = ioutil.ReadAll(r.Body)
+		}
+		// Restore the io.ReadCloser to its original state
+		r.Body = ioutil.NopCloser(bytes.NewBuffer(bodyBytes))
+		// Get body string
+		bodyString := string(bodyBytes)
+		// Also read the path+"?"+query
+		pathQuery := fmt.Sprintf("%v?%v", r.URL.Path, r.URL.RawQuery)
+		// Concatenate into tuple of two strings.
+		tuple := struct {
+			Body string
+			Path string
+		}{bodyString, pathQuery}
+		// Get sign bytes
+		signBytes := binary.BinaryBytes(tuple)
+		// Validate the sign bytes.
+		//if validate(signBytes, validators,
+		log.Debug("Should sign", "bytes", signBytes)
+		// If validation fails
+		// XXX
+		// If validation passes
+		handler.ServeHTTP(w, r)
+	})
+}
+*/