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package client
import (
"bytes"
"context"
"fmt"
"io/ioutil"
"net/http"
"time"
"git.sigsum.org/sigsum-go/pkg/requests"
"git.sigsum.org/sigsum-go/pkg/types"
"git.sigsum.org/sigsum-go/pkg/log"
"git.sigsum.org/sigsum-go/pkg/merkle"
)
type Client interface {
GetUnsignedTreeHead(context.Context) (types.TreeHead, error)
GetToCosignTreeHead(context.Context) (types.SignedTreeHead, error)
GetCosignedTreeHead(context.Context) (types.CosignedTreeHead, error)
GetInclusionProof(context.Context, requests.InclusionProof) (types.InclusionProof, error)
GetConsistencyProof(context.Context, requests.ConsistencyProof) (types.ConsistencyProof, error)
GetLeaves(context.Context, requests.Leaves) (types.Leaves, error)
AddLeaf(context.Context, requests.Leaf) (bool, error)
AddCosignature(context.Context, requests.Cosignature) error
Initiated() bool
}
type Config struct {
UserAgent string
LogURL string
LogPub types.PublicKey
// TODO: witness public keys + policy
}
func New(cfg Config) Client {
return &client{
Config: cfg,
Client: http.Client{},
}
}
type client struct {
Config
http.Client
}
func (cli *client) Initiated() bool {
return cli.LogURL != ""
}
func (cli *client) GetUnsignedTreeHead(ctx context.Context) (th types.TreeHead, err error) {
body, _, err := cli.get(ctx, types.EndpointGetTreeHeadUnsigned.Path(cli.LogURL))
if err != nil {
return th, fmt.Errorf("get: %w", err)
}
if err := th.FromASCII(bytes.NewBuffer(body)); err != nil {
return th, fmt.Errorf("parse: %w", err)
}
return th, nil
}
func (cli *client) GetToCosignTreeHead(ctx context.Context) (sth types.SignedTreeHead, err error) {
body, _, err := cli.get(ctx, types.EndpointGetTreeHeadToCosign.Path(cli.LogURL))
if err != nil {
return sth, fmt.Errorf("get: %w", err)
}
if err := sth.FromASCII(bytes.NewBuffer(body)); err != nil {
return sth, fmt.Errorf("parse: %w", err)
}
if ok := sth.Verify(&cli.LogPub, merkle.HashFn(cli.LogPub[:])); !ok {
return sth, fmt.Errorf("invalid log signature")
}
return sth, nil
}
func (cli *client) GetCosignedTreeHead(ctx context.Context) (cth types.CosignedTreeHead, err error) {
body, _, err := cli.get(ctx, types.EndpointGetTreeHeadCosigned.Path(cli.LogURL))
if err != nil {
return cth, fmt.Errorf("get: %w", err)
}
if err := cth.FromASCII(bytes.NewBuffer(body)); err != nil {
return cth, fmt.Errorf("parse: %w", err)
}
if ok := cth.SignedTreeHead.Verify(&cli.LogPub, merkle.HashFn(cli.LogPub[:])); !ok {
return cth, fmt.Errorf("invalid log signature")
}
// TODO: verify cosignatures based on policy
return cth, nil
}
func (cli *client) GetInclusionProof(ctx context.Context, req requests.InclusionProof) (proof types.InclusionProof, err error) {
return proof, fmt.Errorf("TODO")
}
func (cli *client) GetConsistencyProof(ctx context.Context, req requests.ConsistencyProof) (proof types.ConsistencyProof, err error) {
body, _, err := cli.get(ctx, req.ToURL(types.EndpointGetConsistencyProof.Path(cli.LogURL)))
if err != nil {
return proof, fmt.Errorf("get: %w", err)
}
if err := proof.FromASCII(bytes.NewBuffer(body), req.OldSize, req.NewSize); err != nil {
return proof, fmt.Errorf("parse: %w", err)
}
return proof, nil
}
func (cli *client) GetLeaves(ctx context.Context, req requests.Leaves) (leaves types.Leaves, err error) {
body, _, err := cli.get(ctx, req.ToURL(types.EndpointGetLeaves.Path(cli.LogURL)))
if err != nil {
return leaves, fmt.Errorf("get: %w", err)
}
if err := leaves.FromASCII(bytes.NewBuffer(body)); err != nil {
return leaves, fmt.Errorf("parse: %w", err)
}
return leaves, nil
}
func (cli *client) AddLeaf(ctx context.Context, req requests.Leaf) (persisted bool, err error) {
return false, fmt.Errorf("TODO")
}
func (cli *client) AddCosignature(ctx context.Context, req requests.Cosignature) error {
return fmt.Errorf("TODO")
}
func (cli *client) get(ctx context.Context, url string) ([]byte, int, error) {
req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
if err != nil {
return nil, -1, err
}
return cli.do(ctx, req)
}
func (cli *client) post(ctx context.Context, url string, body []byte) ([]byte, int, error) {
req, err := http.NewRequest(http.MethodPost, url, bytes.NewBuffer(body))
if err != nil {
return nil, -1, err
}
return cli.do(ctx, req)
}
func (cli *client) do(ctx context.Context, req *http.Request) ([]byte, int, error) {
// TODO: redirects, see go doc http.Client.CheckRedirect
// TODO: use ctx or remove it -- the context is already set on req so it seems unneccesary
req.Header.Set("User-Agent", cli.UserAgent)
var rsp *http.Response
var err error
for wait := 1; wait < 10 ; wait *= 2 {
log.Debug("trying %v", req.URL)
if rsp, err = cli.Client.Do(req); err == nil {
break
}
sleep := time.Duration(wait) * time.Second
log.Debug("retrying in %v", sleep)
time.Sleep(sleep)
}
if err != nil {
return nil, -1, fmt.Errorf("send request: %w", err)
}
defer rsp.Body.Close()
b, err := ioutil.ReadAll(rsp.Body)
if err != nil {
return nil, rsp.StatusCode, fmt.Errorf("read response: %w", err)
}
if low, high := 200, 299; rsp.StatusCode < low || rsp.StatusCode > high {
err = fmt.Errorf("not 2XX status code: %d", rsp.StatusCode)
}
return b, rsp.StatusCode, err
}
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