forked from Consensys/quorum
/
service.go
158 lines (143 loc) · 5.15 KB
/
service.go
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// Copyright 2019 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package graphql
import (
"encoding/json"
"net/http"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/plugin/security"
"github.com/ethereum/go-ethereum/rpc"
"github.com/graph-gophers/graphql-go"
)
type handler struct {
Schema *graphql.Schema
}
func (h handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
var params struct {
Query string `json:"query"`
OperationName string `json:"operationName"`
Variables map[string]interface{} `json:"variables"`
}
if err := json.NewDecoder(r.Body).Decode(¶ms); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
response := h.Schema.Exec(r.Context(), params.Query, params.OperationName, params.Variables)
responseJSON, err := json.Marshal(response)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if len(response.Errors) > 0 {
w.WriteHeader(http.StatusBadRequest)
}
w.Header().Set("Content-Type", "application/json")
w.Write(responseJSON)
}
// New constructs a new GraphQL service instance.
func New(stack *node.Node, backend ethapi.Backend, cors, vhosts []string) error {
if backend == nil {
panic("missing backend")
}
// check if http server with given endpoint exists and enable graphQL on it
return newHandler(stack, backend, cors, vhosts)
}
// newHandler returns a new `http.Handler` that will answer GraphQL queries.
// It additionally exports an interactive query browser on the / endpoint.
func newHandler(stack *node.Node, backend ethapi.Backend, cors, vhosts []string) error {
q := Resolver{backend}
s, err := graphql.ParseSchema(schema, &q)
if err != nil {
return err
}
h := handler{Schema: s}
// Quorum
// we wrap the handler with security logic to support
// auth/authz and multiple private states handling
// as GraphQL handler is created before services start
// so we need to defer the authManagerFunc creation in the later call.
authManagerFunc := func() (security.AuthenticationManager, error) {
// Obtain the authentication manager for the handler to deal with rpc security
_, auth, err := stack.GetSecuritySupports()
if err != nil {
return nil, err
}
if auth == nil {
return security.NewDisabledAuthenticationManager(), nil
}
return auth, err
}
handler := &secureHandler{
authManagerFunc: authManagerFunc,
isMultitenant: stack.Config().EnableMultitenancy,
protectedMethod: "graphql_*", // this follows JSON RPC convention using namespace graphql
delegate: node.NewHTTPHandlerStack(h, cors, vhosts),
}
// need to obtain eth service in order to know if MPS is enabled
isMPS := false
var ethereum *eth.Ethereum
if err := stack.Lifecycle(ðereum); err != nil {
log.Warn("Eth service is not ready yet", "error", err)
} else {
isMPS = ethereum.BlockChain().Config().IsMPS
}
stack.RegisterHandler("GraphQL UI", "/graphql/ui", GraphiQL{
authManagerFunc: authManagerFunc,
isMPS: isMPS,
})
stack.RegisterHandler("GraphQL", "/graphql", handler)
stack.RegisterHandler("GraphQL", "/graphql/", handler)
return nil
}
// Quorum
//
// secureHandler wraps around the http handler in order to perform rpc security
// and propagate the PSI into the request context.
type secureHandler struct {
delegate http.Handler
protectedMethod string
authManagerFunc security.AuthenticationManagerDeferFunc
isMultitenant bool
}
func (h *secureHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
authManager, err := h.authManagerFunc()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
securityContext := rpc.WithIsMultitenant(r.Context(), h.isMultitenant)
// authentication check
securityContext = rpc.AuthenticateHttpRequest(securityContext, r, authManager)
// authorization check
securedCtx, err := rpc.SecureCall(&securityContextHolder{ctx: securityContext}, h.protectedMethod)
if err != nil {
http.Error(w, err.Error(), http.StatusForbidden)
return
}
h.delegate.ServeHTTP(w, r.WithContext(securedCtx))
}
// Quorum
// securityContextHolder stores a context so it can be retrieved later
// via rpc.SecurityContextResolver interface
type securityContextHolder struct {
ctx rpc.SecurityContext
}
func (sh *securityContextHolder) Resolve() rpc.SecurityContext {
return sh.ctx
}