ntfy/server/util.go

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package server
import (
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"fmt"
"github.com/emersion/go-smtp"
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"heckel.io/ntfy/log"
"heckel.io/ntfy/util"
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"io"
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"net/http"
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"net/netip"
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"strings"
"unicode/utf8"
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)
func readBoolParam(r *http.Request, defaultValue bool, names ...string) bool {
value := strings.ToLower(readParam(r, names...))
if value == "" {
return defaultValue
}
return value == "1" || value == "yes" || value == "true"
}
func readParam(r *http.Request, names ...string) string {
value := readHeaderParam(r, names...)
if value != "" {
return value
}
return readQueryParam(r, names...)
}
func readHeaderParam(r *http.Request, names ...string) string {
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for _, name := range names {
value := r.Header.Get(name)
if value != "" {
return strings.TrimSpace(value)
}
}
return ""
}
func readQueryParam(r *http.Request, names ...string) string {
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for _, name := range names {
value := r.URL.Query().Get(strings.ToLower(name))
if value != "" {
return strings.TrimSpace(value)
}
}
return ""
}
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func logMessagePrefix(v *visitor, m *message) string {
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return fmt.Sprintf("%s/%s/%s", v.String(), m.Topic, m.ID)
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}
func logHTTPPrefix(v *visitor, r *http.Request) string {
requestURI := r.RequestURI
if requestURI == "" {
requestURI = r.URL.Path
}
return fmt.Sprintf("HTTP %s %s %s", v.String(), r.Method, requestURI)
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}
func logStripePrefix(customerID, subscriptionID string) string {
if subscriptionID != "" {
return fmt.Sprintf("STRIPE %s/%s", customerID, subscriptionID)
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}
return fmt.Sprintf("STRIPE %s", customerID)
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}
func logSMTPPrefix(state *smtp.ConnectionState) string {
return fmt.Sprintf("SMTP %s/%s", state.Hostname, state.RemoteAddr.String())
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}
func renderHTTPRequest(r *http.Request) string {
peekLimit := 4096
lines := fmt.Sprintf("%s %s %s\n", r.Method, r.URL.RequestURI(), r.Proto)
for key, values := range r.Header {
for _, value := range values {
lines += fmt.Sprintf("%s: %s\n", key, value)
}
}
lines += "\n"
body, err := util.Peek(r.Body, peekLimit)
if err != nil {
lines = fmt.Sprintf("(could not read body: %s)\n", err.Error())
} else if utf8.Valid(body.PeekedBytes) {
lines += string(body.PeekedBytes)
if body.LimitReached {
lines += fmt.Sprintf(" ... (peeked %d bytes)", peekLimit)
}
lines += "\n"
} else {
if body.LimitReached {
lines += fmt.Sprintf("(peeked bytes not UTF-8, peek limit of %d bytes reached, hex: %x ...)\n", peekLimit, body.PeekedBytes)
} else {
lines += fmt.Sprintf("(peeked bytes not UTF-8, %d bytes, hex: %x)\n", len(body.PeekedBytes), body.PeekedBytes)
}
}
r.Body = body // Important: Reset body, so it can be re-read
return strings.TrimSpace(lines)
}
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func extractIPAddress(r *http.Request, behindProxy bool) netip.Addr {
remoteAddr := r.RemoteAddr
addrPort, err := netip.ParseAddrPort(remoteAddr)
ip := addrPort.Addr()
if err != nil {
// This should not happen in real life; only in tests. So, using falling back to 0.0.0.0 if address unspecified
ip, err = netip.ParseAddr(remoteAddr)
if err != nil {
ip = netip.IPv4Unspecified()
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if remoteAddr != "@" || !behindProxy { // RemoteAddr is @ when unix socket is used
log.Warn("unable to parse IP (%s), new visitor with unspecified IP (0.0.0.0) created %s", remoteAddr, err)
}
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}
}
if behindProxy && strings.TrimSpace(r.Header.Get("X-Forwarded-For")) != "" {
// X-Forwarded-For can contain multiple addresses (see #328). If we are behind a proxy,
// only the right-most address can be trusted (as this is the one added by our proxy server).
// See https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For for details.
ips := util.SplitNoEmpty(r.Header.Get("X-Forwarded-For"), ",")
realIP, err := netip.ParseAddr(strings.TrimSpace(util.LastString(ips, remoteAddr)))
if err != nil {
log.Error("invalid IP address %s received in X-Forwarded-For header: %s", ip, err.Error())
// Fall back to regular remote address if X-Forwarded-For is damaged
} else {
ip = realIP
}
}
return ip
}
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func readJSONWithLimit[T any](r io.ReadCloser, limit int) (*T, error) {
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obj, err := util.UnmarshalJSONWithLimit[T](r, limit)
if err == util.ErrUnmarshalJSON {
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return nil, errHTTPBadRequestJSONInvalid
} else if err == util.ErrTooLargeJSON {
return nil, errHTTPEntityTooLargeJSONBody
} else if err != nil {
return nil, err
}
return obj, nil
}