core: Add forgotten utils/misc.go file

core/utils/misc.go

@@ -0,0 +1,61 @@
+package utils
+
+import (
+	"crypto/rsa"
+	"errors"
+	"github.com/yawning/bulb/utils/pkcs1"
+	"strings"
+)
+
+// Take a string containing substrings separated by sep, and
+// return a slice of substrings as in strings.Split. Double quotes
+// are stripped from the output, and separator characters within
+// double quotes are included in the substring verbatim. Quotes and
+// escape characters can be escaped with a preceding backslash, which
+// is stripped from the output.
+func UnquoteStringSplit(s string, sep rune) []string {
+	var re []string
+	var quoted bool
+	var escaped bool
+	var current string
+
+	for _, c := range s {
+		if c == '"' && !escaped {
+			quoted = !quoted
+		} else if c == '\\' && !escaped {
+			escaped = true
+		} else if c == sep && !quoted && !escaped {
+			re = append(re, current)
+			current = ""
+		} else {
+			current += string(c)
+			escaped = false
+		}
+	}
+
+	return append(re, current)
+}
+
+func RicochetAddressFromKey(key *rsa.PublicKey) (string, error) {
+	addr, err := pkcs1.OnionAddr(key)
+	if err != nil {
+		return "", err
+	} else if addr == "" {
+		return "", errors.New("Invalid key")
+	}
+	return "ricochet:" + addr, nil
+}
+
+func RicochetAddressFromOnion(onion string) (string, error) {
+	if len(onion) != 23 || !strings.HasSuffix(onion, ".onion") {
+		return "", errors.New("Invalid onion address")
+	}
+	return "ricochet:" + onion[:16], nil
+}
+
+func OnionFromRicochetAddress(address string) (string, error) {
+	if len(address) != 25 || !strings.HasPrefix(address, "ricochet:") {
+		return "", errors.New("Invalid ricochet address")
+	}
+	return address[9:] + ".onion", nil
+}