126 lines
3.0 KiB
Go
126 lines
3.0 KiB
Go
package ctrlbase
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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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"path"
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"strings"
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"go.senan.xyz/gonic/db"
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"go.senan.xyz/gonic/playlist"
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"go.senan.xyz/gonic/scanner"
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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 statusToBlock(code int) string {
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var bg int
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switch {
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case 200 <= code && code <= 299:
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bg = 42 // bright green, ok
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case 300 <= code && code <= 399:
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bg = 46 // bright cyan, redirect
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case 400 <= code && code <= 499:
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bg = 43 // bright orange, client error
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case 500 <= code && code <= 599:
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bg = 41 // bright red, server error
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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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type Controller struct {
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DB *db.DB
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PlaylistStore *playlist.Store
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Scanner *scanner.Scanner
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ProxyPrefix string
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}
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// Path returns a URL path with the proxy prefix included
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func (c *Controller) Path(rel string) string {
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return path.Join(c.ProxyPrefix, rel)
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}
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func (c *Controller) BaseURL(r *http.Request) string {
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protocol := "http"
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if r.TLS != nil {
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protocol = "https"
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}
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scheme := firstExisting(
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protocol, // fallback
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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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)
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host := firstExisting(
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"localhost:4747", // fallback
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r.Header.Get("X-Forwarded-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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func (c *Controller) WithLogging(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// this is (should be) the first middleware. pass right though it
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// by calling `next` first instead of last. when it completes all
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// other middlewares and the custom ResponseWriter has been written
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sw := &statusWriter{ResponseWriter: w}
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next.ServeHTTP(sw, r)
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// sanitise password
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if q := r.URL.Query(); q.Get("p") != "" {
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q.Set("p", "REDACTED")
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r.URL.RawQuery = q.Encode()
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}
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log.Printf("response %s for `%v`", statusToBlock(sw.status), r.URL)
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})
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}
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func (c *Controller) WithCORS(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 firstExisting(or string, strings ...string) string {
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for _, s := range strings {
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if s != "" {
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return s
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}
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}
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return or
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}
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