这是indexloc提供的服务，不要输入任何密码
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parseHeaderWithParams: keeps the first parameter and remove duplicate ones #141

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parseHeaderWithParams: keeps the first parameter and remove duplicate ones #141

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31 changes: 31 additions & 0 deletions header.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,13 +2,44 @@ package message

import (
"mime"
"strings"

"github.com/emersion/go-message/textproto"
)

// removeDuplicateParam keeps the first parameter and remove duplicate ones.
func removeDuplicateParam(s string) string {
var ns string
m := make(map[string]string)

parts := strings.Split(s, ";")
for _, p := range parts {
kv := strings.SplitN(strings.TrimSpace(p), "=", 2)

if len(kv) == 2 {
if _, exists := m[kv[0]]; exists {
continue
} else {
m[kv[0]] = kv[1]
ns += p + ";"
}
} else {
ns += p + ";"
}
}

return ns
}

func parseHeaderWithParams(s string) (f string, params map[string]string, err error) {
f, params, err = mime.ParseMediaType(s)
if err != nil {
if err.Error() == "mime: duplicate parameter name" {
s = removeDuplicateParam(s)

return mime.ParseMediaType(s)
}

return s, nil, err
}
for k, v := range params {
Expand Down