Introduce base plugin

This plugin offers base IMAP/SMTP functionality.

References: https://todo.sr.ht/~sircmpwn/koushin/39

1 files changed, 57 insertions, 0 deletions

diff --git a/plugins/base/strconv.go b/plugins/base/strconv.go
new file mode 100644
index 0000000..1a32e75
--- /dev/null
+++ b/plugins/base/strconv.go
@@ -0,0 +1,57 @@
+package koushinbase
+
+import (
+	"fmt"
+	"net/url"
+	"strconv"
+	"strings"
+)
+
+func parseUid(s string) (uint32, error) {
+	uid, err := strconv.ParseUint(s, 10, 32)
+	if err != nil {
+		return 0, fmt.Errorf("invalid UID: %v", err)
+	}
+	if uid == 0 {
+		return 0, fmt.Errorf("UID must be non-zero")
+	}
+	return uint32(uid), nil
+}
+
+func parseMboxAndUid(mboxString, uidString string) (string, uint32, error) {
+	mboxName, err := url.PathUnescape(mboxString)
+	if err != nil {
+		return "", 0, fmt.Errorf("invalid mailbox name: %v", err)
+	}
+	uid, err := parseUid(uidString)
+	return mboxName, uid, err
+}
+
+func parsePartPath(s string) ([]int, error) {
+	if s == "" {
+		return nil, nil
+	}
+
+	l := strings.Split(s, ".")
+	path := make([]int, len(l))
+	for i, s := range l {
+		var err error
+		path[i], err = strconv.Atoi(s)
+		if err != nil {
+			return nil, err
+		}
+
+		if path[i] <= 0 {
+			return nil, fmt.Errorf("part num must be strictly positive")
+		}
+	}
+	return path, nil
+}
+
+func parseAddressList(s string) []string {
+	l := strings.Split(s, ",")
+	for i, addr := range l {
+		l[i] = strings.TrimSpace(addr)
+	}
+	return l
+}