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package stfe
import (
"crypto"
"fmt"
"time"
"crypto/sha256"
"crypto/x509"
"encoding/base64"
"net/http"
"github.com/golang/glog"
"github.com/google/trillian"
)
// Instance is an instance of a particular log front-end
type Instance struct {
LogParameters *LogParameters
Client trillian.TrillianLogClient
Deadline time.Duration
}
// LogParameters is a collection of log parameters
type LogParameters struct {
LogId []byte // used externally by everyone
TreeId int64 // used internally by Trillian
Prefix string
MaxRange int64 // max entries per get-entries request
AnchorPool *x509.CertPool // for chain verification
AnchorList []*x509.Certificate // for access to the raw certificates
Signer crypto.Signer
HashType crypto.Hash // hash function used by Trillian
}
func (i Instance) String() string {
return fmt.Sprintf("%s Deadline(%v)\n", i.LogParameters, i.Deadline)
}
func (p LogParameters) String() string {
return fmt.Sprintf("LogId(%s) TreeId(%d) Prefix(%s) NumAnchors(%d)", base64.StdEncoding.EncodeToString(p.LogId), p.TreeId, p.Prefix, len(p.AnchorList))
}
// NewInstance returns a new STFE Instance
func NewInstance(lp *LogParameters, client trillian.TrillianLogClient, deadline time.Duration, mux *http.ServeMux) (*Instance, error) {
i := &Instance{
LogParameters: lp,
Client: client,
Deadline: deadline,
}
i.registerHandlers(mux)
return i, nil
}
// NewLogParameters initializes log parameters, assuming ed25519 signatures.
func NewLogParameters(treeId int64, prefix string, anchorPath, keyPath string) (*LogParameters, error) {
anchorList, anchorPool, err := LoadTrustAnchors(anchorPath)
if err != nil {
return nil, err
}
key, err := LoadEd25519SigningKey(keyPath)
if err != nil {
return nil, err
}
pub, err := x509.MarshalPKIXPublicKey(key.Public())
if err != nil {
return nil, fmt.Errorf("failed DER encoding SubjectPublicKeyInfo: %v", err)
}
hasher := sha256.New()
hasher.Write(pub)
logId := hasher.Sum(nil)
return &LogParameters{
LogId: logId,
TreeId: treeId,
Prefix: prefix,
MaxRange: 2, // TODO: allow configuration
AnchorPool: anchorPool,
AnchorList: anchorList,
Signer: key,
HashType: crypto.SHA256,
}, nil
}
func (i *Instance) registerHandlers(mux *http.ServeMux) {
for _, endpoint := range []struct {
path string
handler appHandler
}{
{i.LogParameters.Prefix + "/add-entry", appHandler{instance: i, handler: addEntry, endpoint: "add-entry", method: http.MethodPost}},
{i.LogParameters.Prefix + "/get-entries", appHandler{instance: i, handler: getEntries, endpoint: "get-entries", method: http.MethodGet}},
{i.LogParameters.Prefix + "/get-anchors", appHandler{instance: i, handler: getAnchors, endpoint: "get-anchors", method: http.MethodGet}},
{i.LogParameters.Prefix + "/get-proof-by-hash", appHandler{instance: i, handler: getProofByHash, endpoint: "get-proof-by-hash", method: http.MethodGet}},
{i.LogParameters.Prefix + "/get-consistency-proof", appHandler{instance: i, handler: getConsistencyProof, endpoint: "get-consistency-proof", method: http.MethodGet}},
{i.LogParameters.Prefix + "/get-sth", appHandler{instance: i, handler: getSth, endpoint: "get-sth", method: http.MethodGet}},
} {
glog.Infof("adding handler for %v", endpoint.path)
mux.Handle(endpoint.path, endpoint.handler)
}
}
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