internal/home: Add a status page on home

internal/component/control/extras_self.go

@@ -1,150 +0,0 @@
-package control
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"net/http"
-	"strings"
-
-	"github.com/FAU-CDI/wisski-distillery/internal/component"
-	"github.com/FAU-CDI/wisski-distillery/internal/component/instances"
-	"github.com/tkw1536/goprogram/stream"
-)
-
-// SelfHandler implements serving the '/' route
-type SelfHandler struct {
-	component.ComponentBase
-
-	Instances *instances.Instances
-}
-
-func (SelfHandler) Name() string { return "control-self" }
-
-func (*SelfHandler) Routes() []string { return []string{"/"} }
-
-func (sh *SelfHandler) Handler(route string, context context.Context, io stream.IOStream) (http.Handler, error) {
-	// create a redirect
-	var redirect Redirect
-	var err error
-
-	// open the overrides file
-	overrides, err := sh.Environment.Open(sh.Config.SelfOverridesFile)
-	io.Printf("loading overrides from %q\n", sh.Config.SelfOverridesFile)
-	if err != nil {
-		return redirect, err
-	}
-	defer overrides.Close()
-
-	// decode the overrides file
-	if err := json.NewDecoder(overrides).Decode(&redirect.Overrides); err != nil {
-		return nil, err
-	}
-
-	if redirect.Overrides == nil {
-		redirect.Overrides = make(map[string]string)
-	}
-	redirect.Overrides[""] = sh.Config.SelfRedirect.String()
-
-	// create a redirect server
-	redirect.Fallback, err = sh.selfFallback()
-	if err != nil {
-		return nil, err
-	}
-	redirect.Absolute = false
-	redirect.Permanent = false
-
-	// and return!
-	return redirect, nil
-}
-
-func (sh *SelfHandler) selfFallback() (http.Handler, error) {
-	return http.HandlerFunc(sh.serveFallback), nil
-}
-
-var notFoundText = []byte("not found")
-
-func (sh *SelfHandler) serveFallback(w http.ResponseWriter, r *http.Request) {
-
-	slug := sh.Config.SlugFromHost(r.Host)
-	if slug == "" {
-		w.WriteHeader(http.StatusNotFound)
-		w.Write(notFoundText)
-		return
-	}
-
-	if ok, _ := sh.Instances.Has(slug); !ok {
-		w.WriteHeader(http.StatusNotFound)
-		fmt.Fprintf(w, "WissKI %q not found\n", slug)
-		return
-	}
-
-	w.WriteHeader(http.StatusBadGateway)
-	fmt.Fprintf(w, "WissKI %q is currently offline\n", slug)
-
-}
-
-// Redirect implements a redirect server that redirects all requests.
-// It implements http.Handler.
-type Redirect struct {
-	// Target is the target URL to redirect to.
-	Target string
-
-	// Fallback is used when target is the empty string.
-	Fallback http.Handler
-
-	// Absolute determines if the request path should be appended to the target URL when redirecting.
-	// By default this path is always appended, set Absolute to true to prevent this.
-	Absolute bool
-
-	// Overrides is a map from paths to URLs that should override the default target.
-	Overrides map[string]string
-
-	// Permanent determines if the redirect responses issued should return
-	// Permanent Redirect (Status Code 308) or Temporary Redirect (Status Code 307).
-	Permanent bool
-}
-
-// Redirect determines the redirect URL for a specific incoming request
-// If it returns the empty string, the fallback is used.
-func (redirect Redirect) Redirect(r *http.Request) string {
-	// if we have an override for this URL, use it immediatly
-	url := strings.TrimSuffix(r.URL.Path, "/")
-	if override, ok := redirect.Overrides[url]; ok {
-		return override
-	}
-
-	if redirect.Target == "" {
-		return ""
-	}
-
-	// if we are in absolute redirect mode, always return the absolute URL
-	if redirect.Absolute {
-		return redirect.Target
-	}
-
-	// return the target + the redirected URL
-	dest := strings.TrimSuffix(redirect.Target, "/") + r.URL.Path
-	if len(r.URL.RawQuery) > 0 {
-		dest += "?" + r.URL.RawQuery
-	}
-	return dest
-}
-
-// ServeHTTP implements the http.Handler interface and redirects a single request to redirect.Target.
-func (redirect Redirect) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	dest := redirect.Redirect(r)
-	if dest == "" {
-		redirect.Fallback.ServeHTTP(w, r)
-		return
-	}
-
-	// determine if we are temporary or permanent redirect
-	status := http.StatusTemporaryRedirect
-	if redirect.Permanent {
-		status = http.StatusPermanentRedirect
-	}
-
-	// and do the redirect
-	http.Redirect(w, r, dest, status)
-}