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