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125 lines
3.1 KiB
Go
125 lines
3.1 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package httpclient
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import (
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"fmt"
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"io/ioutil"
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"net/http"
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"path/filepath"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto"
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)
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type HTTPClient struct {
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*http.Transport
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DocRoot string
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schemes []string
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}
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func New(docRoot string) (self *HTTPClient) {
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self = &HTTPClient{
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Transport: &http.Transport{},
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DocRoot: docRoot,
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schemes: []string{"file"},
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}
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self.RegisterProtocol("file", http.NewFileTransport(http.Dir(self.DocRoot)))
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return
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}
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// Clients should be reused instead of created as needed. Clients are safe for concurrent use by multiple goroutines.
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// A Client is higher-level than a RoundTripper (such as Transport) and additionally handles HTTP details such as cookies and redirects.
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func (self *HTTPClient) Client() *http.Client {
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return &http.Client{
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Transport: self,
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}
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}
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func (self *HTTPClient) RegisterScheme(scheme string, rt http.RoundTripper) {
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self.schemes = append(self.schemes, scheme)
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self.RegisterProtocol(scheme, rt)
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}
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func (self *HTTPClient) HasScheme(scheme string) bool {
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for _, s := range self.schemes {
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if s == scheme {
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return true
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}
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}
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return false
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}
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func (self *HTTPClient) GetAuthContent(uri string, hash common.Hash) ([]byte, error) {
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// retrieve content
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content, err := self.Get(uri, "")
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if err != nil {
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return nil, err
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}
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// check hash to authenticate content
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chash := crypto.Keccak256Hash(content)
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if chash != hash {
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return nil, fmt.Errorf("content hash mismatch %x != %x (exp)", hash[:], chash[:])
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}
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return content, nil
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}
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// Get(uri, path) downloads the document at uri, if path is non-empty it
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// is interpreted as a filepath to which the contents are saved
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func (self *HTTPClient) Get(uri, path string) ([]byte, error) {
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// retrieve content
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resp, err := self.Client().Get(uri)
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if err != nil {
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return nil, err
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}
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defer func() {
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if resp != nil {
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resp.Body.Close()
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}
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}()
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var content []byte
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content, err = ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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if resp.StatusCode/100 != 2 {
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return content, fmt.Errorf("HTTP error: %s", resp.Status)
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}
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if path != "" {
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var abspath string
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abspath, err = filepath.Abs(path)
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if err != nil {
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return nil, err
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}
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err = ioutil.WriteFile(abspath, content, 0600)
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if err != nil {
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return nil, err
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}
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}
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return content, nil
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}
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