83 lines
1.8 KiB
Go
83 lines
1.8 KiB
Go
package docserver
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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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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto"
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)
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// http://golang.org/pkg/net/http/#RoundTripper
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var (
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schemes = map[string]func(*DocServer) http.RoundTripper{
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// Simple File server from local disk file:///etc/passwd :)
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"file": fileServerOnDocRoot,
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}
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)
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func fileServerOnDocRoot(ds *DocServer) http.RoundTripper {
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return http.NewFileTransport(http.Dir(ds.DocRoot))
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}
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type DocServer struct {
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*http.Transport
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DocRoot string
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}
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func New(docRoot string) (self *DocServer, err error) {
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self = &DocServer{
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Transport: &http.Transport{},
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DocRoot: docRoot,
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}
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err = self.RegisterProtocols(schemes)
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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 *DocServer) 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 *DocServer) RegisterProtocols(schemes map[string]func(*DocServer) http.RoundTripper) (err error) {
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for scheme, rtf := range schemes {
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self.RegisterProtocol(scheme, rtf(self))
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}
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return
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}
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func (self *DocServer) GetAuthContent(uri string, hash common.Hash) (content []byte, err error) {
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// retrieve content
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resp, err := self.Client().Get(uri)
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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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if err != nil {
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return
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}
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content, err = ioutil.ReadAll(resp.Body)
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if err != nil {
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return
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}
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// check hash to authenticate content
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hashbytes := crypto.Sha3(content)
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var chash common.Hash
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copy(chash[:], hashbytes)
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if chash != hash {
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content = nil
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err = fmt.Errorf("content hash mismatch")
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}
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return
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}
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