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enhanced.go
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enhanced.go
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package response
import (
"fmt"
)
const (
// ClassSuccess specifies that the DSN is reporting a positive delivery
// action. Detail sub-codes may provide notification of
// transformations required for delivery.
ClassSuccess = 2
// ClassTransientFailure - a persistent transient failure is one in which the message as
// sent is valid, but persistence of some temporary condition has
// caused abandonment or delay of attempts to send the message.
// If this code accompanies a delivery failure report, sending in
// the future may be successful.
ClassTransientFailure = 4
// ClassPermanentFailure - a permanent failure is one which is not likely to be resolved
// by resending the message in the current form. Some change to
// the message or the destination must be made for successful
// delivery.
ClassPermanentFailure = 5
)
// space char
const SP = " "
// class is a type for ClassSuccess, ClassTransientFailure and ClassPermanentFailure constants
type class int
// String implements stringer for the class type
func (c class) String() string {
return fmt.Sprintf("%c00", c)
}
// codeMap for mapping Enhanced Status Code to Basic Code
// Mapping according to https://www.iana.org/assignments/smtp-enhanced-status-codes/smtp-enhanced-status-codes.xml
// This might not be entirely useful
var codeMap = struct {
m map[EnhancedStatusCode]int
}{m: map[EnhancedStatusCode]int{
EnhancedStatusCode{ClassSuccess, OtherAddressStatus}: 250,
EnhancedStatusCode{ClassSuccess, DestinationMailboxAddressValid}: 250,
EnhancedStatusCode{ClassSuccess, OtherOrUndefinedMailSystemStatus}: 250,
EnhancedStatusCode{ClassSuccess, OtherOrUndefinedProtocolStatus}: 250,
EnhancedStatusCode{ClassSuccess, ConversionWithLossPerformed}: 250,
EnhancedStatusCode{ClassSuccess, ".6.8"}: 252,
EnhancedStatusCode{ClassSuccess, ".7.0"}: 220,
EnhancedStatusCode{ClassTransientFailure, BadDestinationMailboxAddress}: 451,
EnhancedStatusCode{ClassTransientFailure, BadSendersSystemAddress}: 451,
EnhancedStatusCode{ClassTransientFailure, MailingListExpansionProblem}: 450,
EnhancedStatusCode{ClassTransientFailure, OtherOrUndefinedMailSystemStatus}: 421,
EnhancedStatusCode{ClassTransientFailure, MailSystemFull}: 452,
EnhancedStatusCode{ClassTransientFailure, SystemNotAcceptingNetworkMessages}: 453,
EnhancedStatusCode{ClassTransientFailure, NoAnswerFromHost}: 451,
EnhancedStatusCode{ClassTransientFailure, BadConnection}: 421,
EnhancedStatusCode{ClassTransientFailure, RoutingServerFailure}: 451,
EnhancedStatusCode{ClassTransientFailure, NetworkCongestion}: 451,
EnhancedStatusCode{ClassTransientFailure, OtherOrUndefinedProtocolStatus}: 451,
EnhancedStatusCode{ClassTransientFailure, InvalidCommand}: 430,
EnhancedStatusCode{ClassTransientFailure, TooManyRecipients}: 452,
EnhancedStatusCode{ClassTransientFailure, InvalidCommandArguments}: 451,
EnhancedStatusCode{ClassTransientFailure, ".7.0"}: 450,
EnhancedStatusCode{ClassTransientFailure, ".7.1"}: 451,
EnhancedStatusCode{ClassTransientFailure, ".7.12"}: 422,
EnhancedStatusCode{ClassTransientFailure, ".7.15"}: 450,
EnhancedStatusCode{ClassTransientFailure, ".7.24"}: 451,
EnhancedStatusCode{ClassPermanentFailure, BadDestinationMailboxAddress}: 550,
EnhancedStatusCode{ClassPermanentFailure, BadDestinationMailboxAddressSyntax}: 501,
EnhancedStatusCode{ClassPermanentFailure, BadSendersSystemAddress}: 501,
EnhancedStatusCode{ClassPermanentFailure, ".1.10"}: 556,
EnhancedStatusCode{ClassPermanentFailure, MailboxFull}: 552,
EnhancedStatusCode{ClassPermanentFailure, MessageLengthExceedsAdministrativeLimit}: 552,
EnhancedStatusCode{ClassPermanentFailure, OtherOrUndefinedMailSystemStatus}: 550,
EnhancedStatusCode{ClassPermanentFailure, MessageTooBigForSystem}: 552,
EnhancedStatusCode{ClassPermanentFailure, RoutingServerFailure}: 550,
EnhancedStatusCode{ClassPermanentFailure, OtherOrUndefinedProtocolStatus}: 501,
EnhancedStatusCode{ClassPermanentFailure, InvalidCommand}: 500,
EnhancedStatusCode{ClassPermanentFailure, SyntaxError}: 500,
EnhancedStatusCode{ClassPermanentFailure, InvalidCommandArguments}: 501,
EnhancedStatusCode{ClassPermanentFailure, ".5.6"}: 500,
EnhancedStatusCode{ClassPermanentFailure, ConversionRequiredButNotSupported}: 554,
EnhancedStatusCode{ClassPermanentFailure, ".6.6"}: 554,
EnhancedStatusCode{ClassPermanentFailure, ".6.7"}: 553,
EnhancedStatusCode{ClassPermanentFailure, ".6.8"}: 550,
EnhancedStatusCode{ClassPermanentFailure, ".6.9"}: 550,
EnhancedStatusCode{ClassPermanentFailure, ".7.0"}: 550,
EnhancedStatusCode{ClassPermanentFailure, ".7.1"}: 551,
EnhancedStatusCode{ClassPermanentFailure, ".7.2"}: 550,
EnhancedStatusCode{ClassPermanentFailure, ".7.4"}: 504,
EnhancedStatusCode{ClassPermanentFailure, ".7.8"}: 554,
EnhancedStatusCode{ClassPermanentFailure, ".7.9"}: 534,
EnhancedStatusCode{ClassPermanentFailure, ".7.10"}: 523,
EnhancedStatusCode{ClassPermanentFailure, ".7.11"}: 524,
EnhancedStatusCode{ClassPermanentFailure, ".7.13"}: 525,
EnhancedStatusCode{ClassPermanentFailure, ".7.14"}: 535,
EnhancedStatusCode{ClassPermanentFailure, ".7.15"}: 550,
EnhancedStatusCode{ClassPermanentFailure, ".7.16"}: 552,
EnhancedStatusCode{ClassPermanentFailure, ".7.17"}: 500,
EnhancedStatusCode{ClassPermanentFailure, ".7.18"}: 500,
EnhancedStatusCode{ClassPermanentFailure, ".7.19"}: 500,
EnhancedStatusCode{ClassPermanentFailure, ".7.20"}: 550,
EnhancedStatusCode{ClassPermanentFailure, ".7.21"}: 550,
EnhancedStatusCode{ClassPermanentFailure, ".7.22"}: 550,
EnhancedStatusCode{ClassPermanentFailure, ".7.23"}: 550,
EnhancedStatusCode{ClassPermanentFailure, ".7.24"}: 550,
EnhancedStatusCode{ClassPermanentFailure, ".7.25"}: 550,
EnhancedStatusCode{ClassPermanentFailure, ".7.26"}: 550,
EnhancedStatusCode{ClassPermanentFailure, ".7.27"}: 550,
}}
var (
// Canned is to be read-only, except in the init() function
Canned Responses
)
// Responses has some already pre-constructed responses
type Responses struct {
// The 500's
FailLineTooLong *Response
FailNestedMailCmd *Response
FailNoSenderDataCmd *Response
FailNoRecipientsDataCmd *Response
FailUnrecognizedCmd *Response
FailMaxUnrecognizedCmd *Response
FailReadLimitExceededDataCmd *Response
FailMessageSizeExceeded *Response
FailReadErrorDataCmd *Response
FailPathTooLong *Response
FailInvalidAddress *Response
FailLocalPartTooLong *Response
FailDomainTooLong *Response
FailBackendNotRunning *Response
FailBackendTransaction *Response
FailBackendTimeout *Response
FailRcptCmd *Response
FailMaximumMsgPerConnection *Response
// The 400's
ErrorTooManyRecipients *Response
ErrorRelayDenied *Response
ErrorShutdown *Response
// The 200's
SuccessMailCmd *Response
SuccessRcptCmd *Response
SuccessResetCmd *Response
SuccessVerifyCmd *Response
SuccessNoopCmd *Response
SuccessQuitCmd *Response
SuccessDataCmd *Response
SuccessStartTLSCmd *Response
SuccessMessageQueued *Response
}
// Called automatically during package load to build up the Responses struct
func init() {
Canned = Responses{}
Canned.FailLineTooLong = &Response{
EnhancedCode: InvalidCommand,
BasicCode: 554,
Class: ClassPermanentFailure,
Comment: "Line too long.",
}
Canned.FailNestedMailCmd = &Response{
EnhancedCode: InvalidCommand,
BasicCode: 503,
Class: ClassPermanentFailure,
Comment: "Error: nested MAIL command",
}
Canned.SuccessMailCmd = &Response{
EnhancedCode: OtherAddressStatus,
Class: ClassSuccess,
}
Canned.SuccessRcptCmd = &Response{
EnhancedCode: DestinationMailboxAddressValid,
Class: ClassSuccess,
}
Canned.SuccessResetCmd = Canned.SuccessMailCmd
Canned.SuccessNoopCmd = &Response{
EnhancedCode: OtherStatus,
Class: ClassSuccess,
}
Canned.SuccessVerifyCmd = &Response{
EnhancedCode: OtherOrUndefinedProtocolStatus,
BasicCode: 252,
Class: ClassSuccess,
Comment: "Cannot verify user",
}
Canned.ErrorTooManyRecipients = &Response{
EnhancedCode: TooManyRecipients,
BasicCode: 452,
Class: ClassTransientFailure,
Comment: "Too many recipients",
}
Canned.ErrorRelayDenied = &Response{
EnhancedCode: BadDestinationMailboxAddress,
BasicCode: 454,
Class: ClassTransientFailure,
Comment: "Error: Relay access denied:",
}
Canned.SuccessQuitCmd = &Response{
EnhancedCode: OtherStatus,
BasicCode: 221,
Class: ClassSuccess,
Comment: "Bye",
}
Canned.FailNoSenderDataCmd = &Response{
EnhancedCode: InvalidCommand,
BasicCode: 503,
Class: ClassPermanentFailure,
Comment: "Error: No sender",
}
Canned.FailNoRecipientsDataCmd = &Response{
EnhancedCode: InvalidCommand,
BasicCode: 503,
Class: ClassPermanentFailure,
Comment: "Error: No recipients",
}
Canned.SuccessDataCmd = &Response{
BasicCode: 354,
Comment: "354 Enter message, ending with '.' on a line by itself",
}
Canned.SuccessStartTLSCmd = &Response{
EnhancedCode: OtherStatus,
BasicCode: 220,
Class: ClassSuccess,
Comment: "Ready to start TLS",
}
Canned.FailUnrecognizedCmd = &Response{
EnhancedCode: InvalidCommand,
BasicCode: 554,
Class: ClassPermanentFailure,
Comment: "Unrecognized command",
}
Canned.FailMaxUnrecognizedCmd = &Response{
EnhancedCode: InvalidCommand,
BasicCode: 554,
Class: ClassPermanentFailure,
Comment: "Too many unrecognized commands",
}
Canned.ErrorShutdown = &Response{
EnhancedCode: OtherOrUndefinedMailSystemStatus,
BasicCode: 421,
Class: ClassTransientFailure,
Comment: "Server is shutting down. Please try again later. Sayonara!",
}
Canned.FailReadLimitExceededDataCmd = &Response{
EnhancedCode: SyntaxError,
BasicCode: 550,
Class: ClassPermanentFailure,
Comment: "Error:",
}
Canned.FailMessageSizeExceeded = &Response{
EnhancedCode: SyntaxError,
BasicCode: 550,
Class: ClassPermanentFailure,
Comment: "Error:",
}
Canned.FailReadErrorDataCmd = &Response{
EnhancedCode: OtherOrUndefinedMailSystemStatus,
BasicCode: 451,
Class: ClassTransientFailure,
Comment: "Error:",
}
Canned.FailPathTooLong = &Response{
EnhancedCode: InvalidCommandArguments,
BasicCode: 550,
Class: ClassPermanentFailure,
Comment: "Path too long",
}
Canned.FailInvalidAddress = &Response{
EnhancedCode: InvalidCommandArguments,
BasicCode: 501,
Class: ClassPermanentFailure,
Comment: "Invalid address",
}
Canned.FailLocalPartTooLong = &Response{
EnhancedCode: InvalidCommandArguments,
BasicCode: 550,
Class: ClassPermanentFailure,
Comment: "Local part too long, cannot exceed 64 characters",
}
Canned.FailDomainTooLong = &Response{
EnhancedCode: InvalidCommandArguments,
BasicCode: 550,
Class: ClassPermanentFailure,
Comment: "Domain cannot exceed 255 characters",
}
Canned.FailBackendNotRunning = &Response{
EnhancedCode: OtherOrUndefinedProtocolStatus,
BasicCode: 554,
Class: ClassPermanentFailure,
Comment: "Transaction failed - backend not running",
}
Canned.FailBackendTransaction = &Response{
EnhancedCode: OtherOrUndefinedProtocolStatus,
BasicCode: 554,
Class: ClassPermanentFailure,
Comment: "Error:",
}
Canned.SuccessMessageQueued = &Response{
EnhancedCode: OtherStatus,
BasicCode: 250,
Class: ClassSuccess,
Comment: "OK: queued as",
}
Canned.FailBackendTimeout = &Response{
EnhancedCode: OtherOrUndefinedProtocolStatus,
BasicCode: 554,
Class: ClassPermanentFailure,
Comment: "Error: transaction timeout",
}
Canned.FailRcptCmd = &Response{
EnhancedCode: BadDestinationMailboxAddress,
BasicCode: 550,
Class: ClassPermanentFailure,
Comment: "User unknown in local recipient table",
}
Canned.FailMaximumMsgPerConnection = &Response{
EnhancedCode: OtherOrUndefinedProtocolStatus,
BasicCode: 554,
Class: ClassPermanentFailure,
Comment: "Maximum messages amount per connection exceeded",
}
}
// DefaultMap contains defined default codes (RfC 3463)
const (
OtherStatus = ".0.0"
OtherAddressStatus = ".1.0"
BadDestinationMailboxAddress = ".1.1"
BadDestinationSystemAddress = ".1.2"
BadDestinationMailboxAddressSyntax = ".1.3"
DestinationMailboxAddressAmbiguous = ".1.4"
DestinationMailboxAddressValid = ".1.5"
MailboxHasMoved = ".1.6"
BadSendersMailboxAddressSyntax = ".1.7"
BadSendersSystemAddress = ".1.8"
OtherOrUndefinedMailboxStatus = ".2.0"
MailboxDisabled = ".2.1"
MailboxFull = ".2.2"
MessageLengthExceedsAdministrativeLimit = ".2.3"
MailingListExpansionProblem = ".2.4"
OtherOrUndefinedMailSystemStatus = ".3.0"
MailSystemFull = ".3.1"
SystemNotAcceptingNetworkMessages = ".3.2"
SystemNotCapableOfSelectedFeatures = ".3.3"
MessageTooBigForSystem = ".3.4"
OtherOrUndefinedNetworkOrRoutingStatus = ".4.0"
NoAnswerFromHost = ".4.1"
BadConnection = ".4.2"
RoutingServerFailure = ".4.3"
UnableToRoute = ".4.4"
NetworkCongestion = ".4.5"
RoutingLoopDetected = ".4.6"
DeliveryTimeExpired = ".4.7"
OtherOrUndefinedProtocolStatus = ".5.0"
InvalidCommand = ".5.1"
SyntaxError = ".5.2"
TooManyRecipients = ".5.3"
InvalidCommandArguments = ".5.4"
WrongProtocolVersion = ".5.5"
OtherOrUndefinedMediaError = ".6.0"
MediaNotSupported = ".6.1"
ConversionRequiredAndProhibited = ".6.2"
ConversionRequiredButNotSupported = ".6.3"
ConversionWithLossPerformed = ".6.4"
ConversionFailed = ".6.5"
)
var defaultTexts = struct {
m map[EnhancedStatusCode]string
}{m: map[EnhancedStatusCode]string{
EnhancedStatusCode{ClassSuccess, ".0.0"}: "OK",
EnhancedStatusCode{ClassSuccess, ".1.0"}: "OK",
EnhancedStatusCode{ClassSuccess, ".1.5"}: "OK",
EnhancedStatusCode{ClassSuccess, ".5.0"}: "OK",
EnhancedStatusCode{ClassTransientFailure, ".5.3"}: "Too many recipients",
EnhancedStatusCode{ClassTransientFailure, ".5.4"}: "Relay access denied",
EnhancedStatusCode{ClassPermanentFailure, ".5.1"}: "Invalid command",
}}
// Response type for Stringer interface
type Response struct {
EnhancedCode subjectDetail
BasicCode int
Class class
// Comment is optional
Comment string
cached string
}
// it looks like this ".5.4"
type subjectDetail string
// EnhancedStatus are the ones that look like 2.1.0
type EnhancedStatusCode struct {
Class class
SubjectDetailCode subjectDetail
}
// String returns a string representation of EnhancedStatus
func (e EnhancedStatusCode) String() string {
return fmt.Sprintf("%d%s", e.Class, e.SubjectDetailCode)
}
// String returns a custom Response as a string
func (r *Response) String() string {
if r.cached != "" {
return r.cached
}
if r.EnhancedCode == "" {
r.cached = r.Comment
return r.Comment
}
basicCode := r.BasicCode
comment := r.Comment
if len(comment) == 0 && r.BasicCode == 0 {
var ok bool
if comment, ok = defaultTexts.m[EnhancedStatusCode{r.Class, r.EnhancedCode}]; !ok {
switch r.Class {
case 2:
comment = "OK"
case 4:
comment = "Temporary failure."
case 5:
comment = "Permanent failure."
}
}
}
e := EnhancedStatusCode{r.Class, r.EnhancedCode}
if r.BasicCode == 0 {
basicCode = getBasicStatusCode(e)
}
r.cached = fmt.Sprintf("%d %s %s", basicCode, e.String(), comment)
return r.cached
}
// getBasicStatusCode gets the basic status code from codeMap, or fallback code if not mapped
func getBasicStatusCode(e EnhancedStatusCode) int {
if val, ok := codeMap.m[e]; ok {
return val
}
// Fallback if code is not defined
return int(e.Class) * 100
}