109 lines
2.8 KiB
Go
109 lines
2.8 KiB
Go
package main
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import (
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"fmt"
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"io"
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"log"
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"net/http"
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"regexp"
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"strings"
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)
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const port = "8280"
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var emailRegex = regexp.MustCompile(`(?i)<EMailAddress>([^<]+)</EMailAddress>`)
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func main() {
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http.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusOK)
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fmt.Fprint(w, "OK")
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})
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http.HandleFunc("/autodiscover/autodiscover.xml", handleAutodiscover)
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// Outlook sendet manchmal mit Großbuchstaben
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http.HandleFunc("/Autodiscover/Autodiscover.xml", handleAutodiscover)
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http.HandleFunc("/AutoDiscover/AutoDiscover.xml", handleAutodiscover)
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log.Printf("[autodiscover] Listening on port %s", port)
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if err := http.ListenAndServe(":"+port, nil); err != nil {
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log.Fatal(err)
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}
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}
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func handleAutodiscover(w http.ResponseWriter, r *http.Request) {
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var email string
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if r.Method == http.MethodPost {
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body, err := io.ReadAll(r.Body)
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if err == nil {
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if match := emailRegex.FindStringSubmatch(string(body)); len(match) > 1 {
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email = strings.TrimSpace(match[1])
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}
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}
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r.Body.Close()
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}
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var domain string
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if email != "" {
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parts := strings.SplitN(email, "@", 2)
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if len(parts) == 2 {
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domain = parts[1]
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}
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}
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if domain == "" {
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domain = extractDomainFromHost(r.Host)
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}
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log.Printf("[autodiscover] %s from %s - email=%q domain=%s", r.Method, r.RemoteAddr, email, domain)
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w.Header().Set("Content-Type", "application/xml")
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w.WriteHeader(http.StatusOK)
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fmt.Fprint(w, buildResponse(domain, email))
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}
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func extractDomainFromHost(host string) string {
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// Strip port
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if idx := strings.Index(host, ":"); idx >= 0 {
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host = host[:idx]
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}
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parts := strings.Split(host, ".")
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if len(parts) >= 3 && strings.EqualFold(parts[0], "autodiscover") {
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return strings.Join(parts[1:], ".")
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}
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if len(parts) >= 2 {
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return strings.Join(parts[len(parts)-2:], ".")
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}
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return host
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}
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func buildResponse(domain, loginName string) string {
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return fmt.Sprintf(`<?xml version="1.0" encoding="utf-8"?>
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<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006">
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<Response xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a">
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<Account>
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<AccountType>email</AccountType>
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<Action>settings</Action>
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<Protocol>
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<Type>IMAP</Type>
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<Server>imap.%s</Server>
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<Port>993</Port>
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<DomainRequired>off</DomainRequired>
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<LoginName>%s</LoginName>
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<SPA>off</SPA>
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<SSL>on</SSL>
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<AuthRequired>on</AuthRequired>
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</Protocol>
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<Protocol>
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<Type>SMTP</Type>
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<Server>smtp.%s</Server>
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<Port>465</Port>
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<DomainRequired>off</DomainRequired>
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<LoginName>%s</LoginName>
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<SPA>off</SPA>
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<SSL>on</SSL>
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<AuthRequired>on</AuthRequired>
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</Protocol>
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</Account>
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</Response>
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</Autodiscover>`, domain, loginName, domain, loginName)
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} |