67 lines
1.5 KiB
Go
67 lines
1.5 KiB
Go
package auth
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import (
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"log"
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"net/http"
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"github.com/emersion/go-imap/client"
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"github.com/emersion/go-sasl"
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)
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type IMAPProvider struct {
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addr string
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tls bool
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}
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// Initializes a new IMAP auth provider with the given connection string.
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func NewIMAP(addr string, tls bool) AuthProvider {
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prov := &IMAPProvider{addr, tls}
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conn, err := prov.dial()
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if err != nil {
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log.Fatalf("Error dialing configured IMAP auth server: %s", err.Error())
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}
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conn.Close()
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return prov
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}
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func (prov *IMAPProvider) Middleware() func(http.Handler) http.Handler {
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return func (next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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prov.doAuth(next, w, r)
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})
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}
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}
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func (prov *IMAPProvider) doAuth(next http.Handler,
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w http.ResponseWriter, r *http.Request) {
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user, pass, ok := r.BasicAuth()
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if !ok {
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w.Header().Add("WWW-Authenticate", `Basic realm="Please provide your IMAP credentials", charset="UTF-8"`)
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http.Error(w, "HTTP Basic auth is required", http.StatusUnauthorized)
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return
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}
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conn, err := prov.dial()
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if err != nil {
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http.Error(w, "Temporary authentication error, try again later", http.StatusServiceUnavailable)
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return
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}
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defer conn.Close()
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auth := sasl.NewPlainClient("", user, pass)
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if err := conn.Authenticate(auth); err != nil {
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http.Error(w, "Invalid username or password", http.StatusUnauthorized)
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return
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}
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next.ServeHTTP(w, r)
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}
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func (prov *IMAPProvider) dial() (*client.Client, error) {
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if prov.tls {
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return client.DialTLS(prov.addr, nil)
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} else {
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return client.Dial(prov.addr)
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}
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}
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