1 files changed, 127 insertions, 0 deletions
diff --git a/pkg/config/url.go b/pkg/config/url.go
new file mode 100644
index 0000000..403f787
--- /dev/null
+++ b/pkg/config/url.go
@@ -0,0 +1,127 @@
+package config
+
+import (
+	"fmt"
+	"net"
+	"net/url"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Url struct {
+	Scheme   string `yaml:"scheme"`
+	User     string `yaml:"user"`
+	Password string `yaml:"password"`
+	Host     string `yaml:"host"`
+	Port     string `yaml:"port"`
+	Root     string `yaml:"root"`
+}
+
+func (u *Url) Empty() bool {
+	return u.Host == ""
+}
+
+func (u *Url) UnmarshalYAML(value *yaml.Node) (err error) {
+	if value.ShortTag() == strTag {
+		var val string
+		var rawUrl *url.URL
+
+		if err = value.Decode(&val); err != nil {
+			return err
+		}
+		if rawUrl, err = url.Parse(val); err != nil {
+			return err
+		}
+
+		u.Scheme = rawUrl.Scheme
+		u.User = rawUrl.User.Username()
+		u.Password, _ = rawUrl.User.Password()
+		u.Host = rawUrl.Hostname()
+		u.Port = rawUrl.Port()
+		u.Root = rawUrl.Path
+	} else {
+		type _url Url // avoid recursion
+		wrapped := (*_url)(u)
+		if err = value.Decode(wrapped); err != nil {
+			return err
+		}
+	}
+
+	u.sanitize()
+
+	if errors := u.validate(); len(errors) > 0 {
+		errs := make([]string, len(errors)+1)
+		copy(errs[1:], errors)
+		errs[0] = fmt.Sprintf("line %d: Invalid target:", value.Line)
+		return &yaml.TypeError{Errors: errs}
+	}
+
+	return nil
+}
+
+func (u *Url) String() string {
+	var pwd string
+	if u.Password != "" {
+		pwd = ":******"
+	}
+
+	return fmt.Sprintf("%s://%s%s@%s%s", u.Scheme, u.User, pwd, u.HostPort(), u.Root)
+}
+
+func (u *Url) HostPort() string {
+	if u.Port != "" {
+		return net.JoinHostPort(u.Host, u.Port)
+	}
+	return u.Host
+}
+
+const (
+	imapsPort   = "993"
+	imapPort    = "143"
+	imapsSchema = "imaps"
+	imapSchema  = "imap"
+)
+
+func (u *Url) ForceTLS() bool {
+	return u.Scheme == imapsSchema || u.Port == imapsPort
+}
+
+func (u *Url) setDefaultScheme() {
+	if u.Scheme == "" {
+		if u.Port == imapsPort {
+			u.Scheme = imapsSchema
+		} else {
+			u.Scheme = imapSchema
+		}
+	}
+}
+
+func (u *Url) setDefaultPort() {
+	if u.Port == "" {
+		if u.Scheme == imapsSchema {
+			u.Port = imapsPort
+		} else {
+			u.Port = imapPort
+		}
+	}
+}
+
+func (u *Url) sanitize() {
+	u.setDefaultScheme()
+	u.setDefaultPort()
+}
+
+func (u *Url) validate() (errors []string) {
+	if u.Scheme != imapSchema && u.Scheme != imapsSchema {
+		errors = append(errors, fmt.Sprintf("Unknown scheme %q", u.Scheme))
+	}
+
+	if u.Host == "" {
+		errors = append(errors, "Host not set")
+	}
+
+	if u.Root == "" || u.Root == "/" {
+		errors = append(errors, "Root path not set")
+	}
+	return
+}