forked from hectane/hectane
/
util.go
44 lines (40 loc) · 1.2 KB
/
util.go
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package email
import (
"fmt"
"html"
"net/mail"
"regexp"
"strings"
)
// The link RegExp is adapted from http://stackoverflow.com/a/3809435/193619.
var (
replaceCRLF = regexp.MustCompile(`\r?\n`)
replaceLinks = regexp.MustCompile(`https?:\/\/[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b(?:[-a-zA-Z0-9@:%_\+.~#?&//=]*)`)
)
// Group a list of email addresses by their host. An error will be returned if
// any of the addresses are invalid.
func GroupAddressesByHost(addrs []string) (map[string][]string, error) {
m := make(map[string][]string)
for _, addr := range addrs {
a, err := mail.ParseAddress(addr)
if err != nil {
return nil, err
}
parts := strings.Split(a.Address, "@")
if m[parts[1]] == nil {
m[parts[1]] = make([]string, 0, 1)
}
m[parts[1]] = append(m[parts[1]], a.Address)
}
return m, nil
}
// Convert the specified text to its HTML equivalent, preserving formatting
// where possible and converting URLs to <a> elements.
func toHTML(data string) string {
data = html.EscapeString(data)
data = replaceCRLF.ReplaceAllString(data, "<br>")
data = replaceLinks.ReplaceAllStringFunc(data, func(m string) string {
return fmt.Sprintf("<a href=\"%s\">%s</a>", m, m)
})
return data
}