71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
package smtp
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import (
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"github.com/nicholas-fedor/shoutrrr/pkg/format"
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"github.com/nicholas-fedor/shoutrrr/pkg/types"
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)
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const (
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// EncNone represents no encryption.
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EncNone encMethod = iota // 0
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// EncExplicitTLS represents explicit TLS initiated with StartTLS.
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EncExplicitTLS // 1
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// EncImplicitTLS represents implicit TLS used throughout the session.
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EncImplicitTLS // 2
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// EncAuto represents automatic TLS selection based on port.
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EncAuto // 3
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// ImplicitTLSPort is the de facto standard SMTPS port for implicit TLS.
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ImplicitTLSPort = 465
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)
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// EncMethods is the enum helper for populating the Encryption field.
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var EncMethods = &encMethodVals{
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None: EncNone,
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ExplicitTLS: EncExplicitTLS,
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ImplicitTLS: EncImplicitTLS,
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Auto: EncAuto,
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Enum: format.CreateEnumFormatter(
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[]string{
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"None",
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"ExplicitTLS",
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"ImplicitTLS",
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"Auto",
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}),
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}
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type encMethod int
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type encMethodVals struct {
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// None means no encryption
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None encMethod
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// ExplicitTLS means that TLS needs to be initiated by using StartTLS
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ExplicitTLS encMethod
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// ImplicitTLS means that TLS is used for the whole session
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ImplicitTLS encMethod
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// Auto means that TLS will be implicitly used for port 465, otherwise explicit TLS will be used if supported
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Auto encMethod
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// Enum is the EnumFormatter instance for EncMethods
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Enum types.EnumFormatter
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}
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func (at encMethod) String() string {
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return EncMethods.Enum.Print(int(at))
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}
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// useImplicitTLS determines if implicit TLS should be used based on encryption method and port.
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func useImplicitTLS(encryption encMethod, port uint16) bool {
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switch encryption {
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case EncNone:
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return false
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case EncExplicitTLS:
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return false
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case EncImplicitTLS:
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return true
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case EncAuto:
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return port == ImplicitTLSPort
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default:
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return false // Unreachable due to enum constraints, but included for safety
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}
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}
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