forked from dgraph-io/dgraph
/
share.go
88 lines (79 loc) · 2.49 KB
/
share.go
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/*
* Copyright (C) 2017 Dgraph Labs, Inc. and Contributors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package server
import (
"context"
"crypto/sha256"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"golang.org/x/net/trace"
"github.com/dgraph-io/dgraph/edgraph"
"github.com/dgraph-io/dgraph/protos/api"
"github.com/dgraph-io/dgraph/x"
)
// NewSharedQueryNQuads returns nquads with query and hash.
func NewSharedQueryNQuads(query []byte) []*api.NQuad {
val := func(s string) *api.Value {
return &api.Value{&api.Value_DefaultVal{s}}
}
qHash := fmt.Sprintf("%x", sha256.Sum256(query))
return []*api.NQuad{
{Subject: "_:share", Predicate: "_share_", ObjectValue: val(string(query))},
{Subject: "_:share", Predicate: "_share_hash_", ObjectValue: val(qHash)},
}
}
// shareHandler allows to share a query between users.
func shareHandler(w http.ResponseWriter, r *http.Request) {
var err error
var rawQuery []byte
w.Header().Set("Content-Type", "application/json")
x.AddCorsHeaders(w)
if r.Method != "POST" {
x.SetStatus(w, x.ErrorInvalidMethod, "Invalid method")
return
}
ctx := context.Background()
defer r.Body.Close()
if rawQuery, err = ioutil.ReadAll(r.Body); err != nil || len(rawQuery) == 0 {
if tr, ok := trace.FromContext(ctx); ok {
tr.LazyPrintf("Error while reading the stringified query payload: %+v", err)
}
x.SetStatus(w, x.ErrorInvalidRequest, "Invalid request encountered.")
return
}
mu := &api.Mutation{
Set: NewSharedQueryNQuads(rawQuery),
CommitNow: true,
}
resp, err := (&edgraph.Server{}).Mutate(context.Background(), mu)
if err != nil {
x.SetStatusWithData(w, x.ErrorInvalidRequest, err.Error())
return
}
mp := map[string]interface{}{}
mp["code"] = x.Success
mp["message"] = "Done"
mp["uids"] = resp.Uids
js, err := json.Marshal(mp)
if err != nil {
x.SetStatusWithData(w, x.Error, err.Error())
return
}
w.Write(js)
}