Reorg client code

client/client.go

@@ -1,12 +1,14 @@
 package client
 
 import (
+	"bytes"
 	"crypto"
 	"crypto/ecdsa"
 	"crypto/ed25519"
 	"crypto/rsa"
 	"fmt"
 	"net/http"
+	"net/url"
 	"reflect"
 
 	"github.com/common-fate/httpsig"
@@ -14,9 +16,42 @@ import (
 	"github.com/common-fate/httpsig/alg_ed25519"
 	"github.com/common-fate/httpsig/alg_rsa"
 	"github.com/common-fate/httpsig/signer"
+	"github.com/opencontainers/go-digest"
 )
 
-func GetSigningClient(key crypto.PrivateKey, keyId string) (*http.Client, error) {
+func Post(baseUrl *url.URL, key crypto.PrivateKey, keyId string, data []byte, simulateCaddy bool) (*http.Response, error) {
+	client, err := getSigningClient(key, keyId)
+
+	if err != nil {
+		return nil, err
+	}
+
+	id := digest.FromBytes(data)
+
+	authUrl := baseUrl.JoinPath("auth")
+
+	var req *http.Request
+
+	req, err = http.NewRequest("POST", authUrl.String(), bytes.NewBuffer(data))
+
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Add("Content-Digest", string(id.Algorithm())+"="+id.Encoded())
+	req.Header.Add("Content-Type", "application/json")
+
+	if simulateCaddy {
+		req.Header.Add("X-Forwarded-Method", req.Method)
+		req.Header.Add("X-Forwarded-Uri", req.RequestURI)
+	}
+
+	resp, err := client.Do(req)
+
+	return resp, err
+}
+
+func getSigningClient(key crypto.PrivateKey, keyId string) (*http.Client, error) {
 	var alg signer.Algorithm
 
 	switch p := key.(type) {