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authorzelig <viktor.tron@gmail.com>2015-10-27 05:24:09 +0800
committerzelig <viktor.tron@gmail.com>2015-10-27 05:24:09 +0800
commit4d005a2c1d2929dc770acd3a2bfed59495c70557 (patch)
tree0442ccefd85cc8b692c2c58a5916bc997909657a /common/httpclient/httpclient.go
parent3b4ffacd0c63952ceda96b3fafb050c91e72b420 (diff)
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rpc api: eth_getNatSpec
* xeth, rpc: implement eth_getNatSpec for tx confirmations * rename silly docserver -> httpclient * eth/backend: httpclient now accessible via eth.Ethereum init-d via config.DocRoot * cmd: introduce separate CLI flag for DocRoot (defaults to homedir) * common/path: delete unused assetpath func, separate HomeDir func
Diffstat (limited to 'common/httpclient/httpclient.go')
-rw-r--r--common/httpclient/httpclient.go124
1 files changed, 124 insertions, 0 deletions
diff --git a/common/httpclient/httpclient.go b/common/httpclient/httpclient.go
new file mode 100644
index 000000000..23373ecaf
--- /dev/null
+++ b/common/httpclient/httpclient.go
@@ -0,0 +1,124 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package httpclient
+
+import (
+ "fmt"
+ "io/ioutil"
+ "net/http"
+ "path/filepath"
+
+ "github.com/ethereum/go-ethereum/common"
+ "github.com/ethereum/go-ethereum/crypto"
+)
+
+type HTTPClient struct {
+ *http.Transport
+ DocRoot string
+ schemes []string
+}
+
+func New(docRoot string) (self *HTTPClient) {
+ self = &HTTPClient{
+ Transport: &http.Transport{},
+ DocRoot: docRoot,
+ schemes: []string{"file"},
+ }
+ self.RegisterProtocol("file", http.NewFileTransport(http.Dir(self.DocRoot)))
+ return
+}
+
+// Clients should be reused instead of created as needed. Clients are safe for concurrent use by multiple goroutines.
+
+// A Client is higher-level than a RoundTripper (such as Transport) and additionally handles HTTP details such as cookies and redirects.
+
+func (self *HTTPClient) Client() *http.Client {
+ return &http.Client{
+ Transport: self,
+ }
+}
+
+func (self *HTTPClient) RegisterScheme(scheme string, rt http.RoundTripper) {
+ self.schemes = append(self.schemes, scheme)
+ self.RegisterProtocol(scheme, rt)
+}
+
+func (self *HTTPClient) HasScheme(scheme string) bool {
+ for _, s := range self.schemes {
+ if s == scheme {
+ return true
+ }
+ }
+ return false
+}
+
+func (self *HTTPClient) GetAuthContent(uri string, hash common.Hash) ([]byte, error) {
+ // retrieve content
+ content, err := self.Get(uri, "")
+ if err != nil {
+ return nil, err
+ }
+
+ // check hash to authenticate content
+ chash := crypto.Sha3Hash(content)
+ if chash != hash {
+ return nil, fmt.Errorf("content hash mismatch %x != %x (exp)", hash[:], chash[:])
+ }
+
+ return content, nil
+
+}
+
+// Get(uri, path) downloads the document at uri, if path is non-empty it
+// is interpreted as a filepath to which the contents are saved
+func (self *HTTPClient) Get(uri, path string) ([]byte, error) {
+ // retrieve content
+ resp, err := self.Client().Get(uri)
+ if err != nil {
+ return nil, err
+ }
+ defer func() {
+ if resp != nil {
+ resp.Body.Close()
+ }
+ }()
+
+ var content []byte
+ content, err = ioutil.ReadAll(resp.Body)
+ if err != nil {
+ return nil, err
+ }
+
+ if resp.StatusCode/100 != 2 {
+ return content, fmt.Errorf("HTTP error: %s", resp.Status)
+ }
+
+ if path != "" {
+ var abspath string
+ abspath, err = filepath.Abs(path)
+ if err != nil {
+ return nil, err
+ }
+ err = ioutil.WriteFile(abspath, content, 0600)
+ if err != nil {
+ return nil, err
+ }
+ }
+
+ return content, nil
+
+}