Move the HTTP-01 and TLS-SNI-01 default solvers to a more unified layout.

Made the solvers exported and added New... functions to them.

acme/client.go

@@ -126,7 +126,7 @@ func (c *Client) SetHTTPAddress(iface string) error {
 	}
 
 	if chlng, ok := c.solvers[HTTP01]; ok {
-		chlng.(*httpChallenge).provider = &httpChallengeServer{iface: host, port: port}
+		chlng.(*httpChallenge).provider = NewHTTPProviderServer(host, port)
 	}
 
 	return nil
@@ -142,7 +142,7 @@ func (c *Client) SetTLSAddress(iface string) error {
 	}
 
 	if chlng, ok := c.solvers[TLSSNI01]; ok {
-		chlng.(*tlsSNIChallenge).provider = &tlsSNIChallengeServer{iface: host, port: port}
+		chlng.(*tlsSNIChallenge).provider = NewTLSProviderServer(host, port)
 	}
 	return nil
 }

acme/http_challenge_server.go

@@ -7,16 +7,25 @@ import (
 	"strings"
 )
 
-// httpChallengeServer implements ChallengeProvider for `http-01` challenge
+// HTTPProviderServer implements ChallengeProvider for `http-01` challenge
-type httpChallengeServer struct {
+// It may be instantiated without using the NewHTTPProviderServer function if
+// you want only to use the default values.
+type HTTPProviderServer struct {
 	iface    string
 	port     string
 	done     chan bool
 	listener net.Listener
 }
 
-// Present makes the token available at `HTTP01ChallengePath(token)`
+// NewHTTPProviderServer creates a new HTTPProviderServer on the selected interface and port.
-func (s *httpChallengeServer) Present(domain, token, keyAuth string) error {
+// Setting iface and / or port to an empty string will make the server fall back to
+// the "any" interface and port 80 respectively.
+func NewHTTPProviderServer(iface, port string) *HTTPProviderServer {
+	return &HTTPProviderServer{iface: iface, port: port}
+}
+
+// Present starts a web server and makes the token available at `HTTP01ChallengePath(token)` for web requests.
+func (s *HTTPProviderServer) Present(domain, token, keyAuth string) error {
 	if s.port == "" {
 		s.port = "80"
 	}
@@ -32,7 +41,8 @@ func (s *httpChallengeServer) Present(domain, token, keyAuth string) error {
 	return nil
 }
 
-func (s *httpChallengeServer) CleanUp(domain, token, keyAuth string) error {
+// CleanUp closes the HTTP server and removes the token from `HTTP01ChallengePath(token)`
+func (s *HTTPProviderServer) CleanUp(domain, token, keyAuth string) error {
 	if s.listener == nil {
 		return nil
 	}
@@ -41,7 +51,7 @@ func (s *httpChallengeServer) CleanUp(domain, token, keyAuth string) error {
 	return nil
 }
 
-func (s *httpChallengeServer) serve(domain, token, keyAuth string) {
+func (s *HTTPProviderServer) serve(domain, token, keyAuth string) {
 	path := HTTP01ChallengePath(token)
 
 	// The handler validates the HOST header and request type.

acme/tls_sni_challenge_server.go

@@ -7,16 +7,25 @@ import (
 	"net/http"
 )
 
-// tlsSNIChallengeServer implements ChallengeProvider for `TLS-SNI-01` challenge
+// TLSProviderServer implements ChallengeProvider for `TLS-SNI-01` challenge
-type tlsSNIChallengeServer struct {
+// It may be instantiated without using the NewTLSProviderServer function if
+// you want only to use the default values.
+type TLSProviderServer struct {
 	iface    string
 	port     string
 	done     chan bool
 	listener net.Listener
 }
 
+// NewTLSProviderServer creates a new TLSProviderServer on the selected interface and port.
+// Setting iface and / or port to an empty string will make the server fall back to
+// the "any" interface and port 443 respectively.
+func NewTLSProviderServer(iface, port string) *TLSProviderServer {
+	return &TLSProviderServer{iface: iface, port: port}
+}
+
 // Present makes the keyAuth available as a cert
-func (s *tlsSNIChallengeServer) Present(domain, token, keyAuth string) error {
+func (s *TLSProviderServer) Present(domain, token, keyAuth string) error {
 	if s.port == "" {
 		s.port = "443"
 	}
@@ -42,7 +51,8 @@ func (s *tlsSNIChallengeServer) Present(domain, token, keyAuth string) error {
 	return nil
 }
 
-func (s *tlsSNIChallengeServer) CleanUp(domain, token, keyAuth string) error {
+// CleanUp closes the HTTP server.
+func (s *TLSProviderServer) CleanUp(domain, token, keyAuth string) error {
 	if s.listener == nil {
 		return nil
 	}