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middleware.go
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middleware.go
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package log
import (
"crypto/rand"
"fmt"
"net"
"net/http"
"time"
"github.com/rs/zerolog"
"github.com/pomerium/pomerium/internal/middleware/responsewriter"
"github.com/pomerium/pomerium/internal/telemetry/requestid"
)
// NewHandler injects log into requests context.
func NewHandler(log zerolog.Logger) func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Create a copy of the logger (including internal context slice)
// to prevent data race when using UpdateContext.
l := log.With().Logger()
r = r.WithContext(l.WithContext(r.Context()))
next.ServeHTTP(w, r)
})
}
}
// URLHandler adds the requested URL as a field to the context's logger
// using fieldKey as field key.
func URLHandler(fieldKey string) func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
log := zerolog.Ctx(r.Context())
log.UpdateContext(func(c zerolog.Context) zerolog.Context {
return c.Str(fieldKey, r.URL.String())
})
next.ServeHTTP(w, r)
})
}
}
// MethodHandler adds the request method as a field to the context's logger
// using fieldKey as field key.
func MethodHandler(fieldKey string) func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
log := zerolog.Ctx(r.Context())
log.UpdateContext(func(c zerolog.Context) zerolog.Context {
return c.Str(fieldKey, r.Method)
})
next.ServeHTTP(w, r)
})
}
}
// RequestHandler adds the request method and URL as a field to the context's logger
// using fieldKey as field key.
func RequestHandler(fieldKey string) func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
log := zerolog.Ctx(r.Context())
log.UpdateContext(func(c zerolog.Context) zerolog.Context {
return c.Str(fieldKey, r.Method+" "+r.URL.String())
})
next.ServeHTTP(w, r)
})
}
}
// RemoteAddrHandler adds the request's remote address as a field to the context's logger
// using fieldKey as field key.
func RemoteAddrHandler(fieldKey string) func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if host, _, err := net.SplitHostPort(r.RemoteAddr); err == nil {
log := zerolog.Ctx(r.Context())
log.UpdateContext(func(c zerolog.Context) zerolog.Context {
return c.Str(fieldKey, host)
})
}
next.ServeHTTP(w, r)
})
}
}
// UserAgentHandler adds the request's user-agent as a field to the context's logger
// using fieldKey as field key.
func UserAgentHandler(fieldKey string) func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if ua := r.Header.Get("User-Agent"); ua != "" {
log := zerolog.Ctx(r.Context())
log.UpdateContext(func(c zerolog.Context) zerolog.Context {
return c.Str(fieldKey, ua)
})
}
next.ServeHTTP(w, r)
})
}
}
// RefererHandler adds the request's referer as a field to the context's logger
// using fieldKey as field key.
func RefererHandler(fieldKey string) func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if ref := r.Header.Get("Referer"); ref != "" {
log := zerolog.Ctx(r.Context())
log.UpdateContext(func(c zerolog.Context) zerolog.Context {
return c.Str(fieldKey, ref)
})
}
next.ServeHTTP(w, r)
})
}
}
// RequestIDHandler adds the request's id as a field to the context's logger
// using fieldKey as field key.
func RequestIDHandler(fieldKey string) func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
requestID := requestid.FromContext(r.Context())
if requestID != "" {
log := zerolog.Ctx(r.Context())
log.UpdateContext(func(c zerolog.Context) zerolog.Context {
return c.Str(fieldKey, requestID)
})
}
next.ServeHTTP(w, r)
})
}
}
// AccessHandler returns a handler that call f after each request.
func AccessHandler(f func(r *http.Request, status, size int, duration time.Duration)) func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
start := time.Now()
lw := responsewriter.NewWrapResponseWriter(w, r.ProtoMajor)
next.ServeHTTP(lw, r)
f(r, lw.Status(), lw.BytesWritten(), time.Since(start))
})
}
}
// HeadersHandler adds the provided set of header keys to the log context.
//
// https://tools.ietf.org/html/rfc7239
// https://en.wikipedia.org/wiki/X-Forwarded-For
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For
func HeadersHandler(headers []string) func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
for _, key := range headers {
if values := r.Header[key]; len(values) != 0 {
log := zerolog.Ctx(r.Context())
log.UpdateContext(func(c zerolog.Context) zerolog.Context {
return c.Strs(key, values)
})
}
}
next.ServeHTTP(w, r)
})
}
}
// uuid generates a random 128-bit non-RFC UUID.
func uuid() string {
buf := make([]byte, 16)
if _, err := rand.Read(buf); err != nil {
return ""
}
return fmt.Sprintf("%x-%x-%x-%x-%x", buf[0:4], buf[4:6], buf[6:8], buf[8:10], buf[10:])
}