138 lines
2.9 KiB
Go
138 lines
2.9 KiB
Go
package handlerutil
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import (
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"fmt"
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"log"
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"net/http"
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"strings"
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"time"
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)
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type Middleware func(http.Handler) http.Handler
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func Chain(middlewares ...Middleware) Middleware {
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return func(final http.Handler) http.Handler {
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for i := len(middlewares) - 1; i >= 0; i-- {
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final = middlewares[i](final)
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}
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return final
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}
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}
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func TrimPathSuffix(suffix string) Middleware {
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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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r.URL.Path = strings.TrimSuffix(r.URL.Path, suffix)
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next.ServeHTTP(w, r)
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})
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}
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}
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func Log(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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begin := time.Now()
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sw := &statusWriter{ResponseWriter: w}
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next.ServeHTTP(sw, r)
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elasped := time.Since(begin)
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log.Printf("response %s %s %s %v",
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statusToBlock(sw.status),
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elasped.String(),
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r.Method,
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r.URL)
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})
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}
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func BasicCORS(next http.Handler) http.Handler {
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allowMethods := strings.Join(
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[]string{http.MethodPost, http.MethodGet, http.MethodOptions, http.MethodPut, http.MethodDelete},
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", ",
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)
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allowHeaders := strings.Join(
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[]string{"Accept", "Content-Type", "Content-Length", "Accept-Encoding", "X-CSRF-Token", "Authorization"},
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", ",
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)
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Access-Control-Allow-Origin", "*")
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w.Header().Set("Access-Control-Allow-Methods", allowMethods)
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w.Header().Set("Access-Control-Allow-Headers", allowHeaders)
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if r.Method == http.MethodOptions {
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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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}
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func Message(message string) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintln(w, message)
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})
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}
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func BaseURL(r *http.Request) string {
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var fallbackScheme = "http"
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if r.TLS != nil {
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fallbackScheme = "https"
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}
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scheme := first(
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r.Header.Get("X-Forwarded-Proto"),
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r.Header.Get("X-Forwarded-Scheme"),
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r.URL.Scheme,
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fallbackScheme,
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)
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host := first(
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r.Header.Get("X-Forwarded-Host"),
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r.URL.Host,
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r.Host,
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)
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return fmt.Sprintf("%s://%s", scheme, host)
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}
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type statusWriter struct {
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http.ResponseWriter
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status int
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}
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func (w *statusWriter) WriteHeader(status int) {
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w.status = status
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w.ResponseWriter.WriteHeader(status)
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}
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func (w *statusWriter) Write(b []byte) (int, error) {
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if w.status == 0 {
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w.status = 200
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}
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return w.ResponseWriter.Write(b)
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}
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func (w *statusWriter) Unwrap() http.ResponseWriter {
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return w.ResponseWriter
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}
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func statusToBlock(code int) string {
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var bg int
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switch {
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case code >= 500:
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bg = 41 // bright red
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case code >= 400:
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bg = 43 // bright orange
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case code >= 300:
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bg = 46 // bright cyan
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case code >= 200:
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bg = 42 // bright green
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default:
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bg = 47 // bright white (grey)
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}
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return fmt.Sprintf("\u001b[%d;1m %d \u001b[0m", bg, code)
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}
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func first[T comparable](vs ...T) T {
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var z T
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for _, s := range vs {
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if s != z {
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return s
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}
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}
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return z
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}
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