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Allow setting lookup DNS/TXT function #25

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Allow setting lookup DNS/TXT function #25

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250b808
Fix dkim verification issues and dmarc alignment default
Nov 15, 2019
4126cd2
Fix dkim verification issues and dmarc alignment default
Nov 15, 2019
5eaacad
Fix dkim verification issues and dmarc alignment default
Nov 15, 2019
3351c24
Merge branch 'master' of https://github.com/emersion/go-msgauth
Apr 11, 2020
89e8201
Allow setting lookup DNS/TXT function
Apr 11, 2020
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10 changes: 9 additions & 1 deletion dkim/query.go
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Original file line number Diff line number Diff line change
Expand Up @@ -68,8 +68,16 @@ var queryMethods = map[QueryMethod]queryFunc{
QueryMethodDNSTXT: queryDNSTXT,
}

var lookupTXT = net.LookupTXT

type lookupTXTFunc func(name string) ([]string, error)

func SetLookupTXTFunc(lookup lookupTXTFunc) {
lookupTXT = lookup
}

func queryDNSTXT(domain, selector string) (*queryResult, error) {
txts, err := net.LookupTXT(selector + "._domainkey." + domain)
txts, err := lookupTXT(selector + "._domainkey." + domain)
if netErr, ok := err.(net.Error); ok && netErr.Temporary() {
return nil, tempFailError("key unavailable: " + err.Error())
} else if err != nil {
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10 changes: 9 additions & 1 deletion dmarc/lookup.go
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Original file line number Diff line number Diff line change
Expand Up @@ -24,9 +24,17 @@ func IsTempFail(err error) bool {

var ErrNoPolicy = errors.New("dmarc: no policy found for domain")

var lookupTXT = net.LookupTXT

type lookupTXTFunc func(name string) ([]string, error)

func SetLookupTXTFunc(lookup lookupTXTFunc) {
lookupTXT = lookup
}

// Lookup queries a DMARC record for a specified domain.
func Lookup(domain string) (*Record, error) {
txts, err := net.LookupTXT("_dmarc." + domain)
txts, err := lookupTXT("_dmarc." + domain)
if netErr, ok := err.(net.Error); ok && netErr.Temporary() {
return nil, tempFailError("TXT record unavailable: " + err.Error())
} else if err != nil {
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