Make CoreDNS a server type plugin for Caddy (#220)

* Make CoreDNS a server type plugin for Caddy

Remove code we don't need and port all middleware over. Fix all tests
and rework the documentation.

Also make `go generate` build a caddy binary which we then copy into
our directory. This means `go build`-builds remain working as-is.

And new etc instances in each etcd test for better isolation.
Fix more tests and rework test.Server with the newer support Caddy offers.

Fix Makefile to support new mode of operation.

1 files changed, 0 insertions, 42 deletions

diff --git a/core/https/handler.go b/core/https/handler.go
deleted file mode 100644
index f3139f54e..000000000
--- a/core/https/handler.go
+++ /dev/null
@@ -1,42 +0,0 @@
-package https
-
-import (
-	"crypto/tls"
-	"log"
-	"net/http"
-	"net/http/httputil"
-	"net/url"
-	"strings"
-)
-
-const challengeBasePath = "/.well-known/acme-challenge"
-
-// RequestCallback proxies challenge requests to ACME client if the
-// request path starts with challengeBasePath. It returns true if it
-// handled the request and no more needs to be done; it returns false
-// if this call was a no-op and the request still needs handling.
-func RequestCallback(w http.ResponseWriter, r *http.Request) bool {
-	if strings.HasPrefix(r.URL.Path, challengeBasePath) {
-		scheme := "http"
-		if r.TLS != nil {
-			scheme = "https"
-		}
-
-		upstream, err := url.Parse(scheme + "://localhost:" + AlternatePort)
-		if err != nil {
-			w.WriteHeader(http.StatusInternalServerError)
-			log.Printf("[ERROR] ACME proxy handler: %v", err)
-			return true
-		}
-
-		proxy := httputil.NewSingleHostReverseProxy(upstream)
-		proxy.Transport = &http.Transport{
-			TLSClientConfig: &tls.Config{InsecureSkipVerify: true}, // solver uses self-signed certs
-		}
-		proxy.ServeHTTP(w, r)
-
-		return true
-	}
-
-	return false
-}