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get_artifact.go
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/
get_artifact.go
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// Copyright 2020 The LUCI Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package resultdb
import (
"context"
"google.golang.org/grpc/metadata"
"go.chromium.org/luci/common/errors"
"go.chromium.org/luci/grpc/appstatus"
"go.chromium.org/luci/server/span"
"go.chromium.org/luci/resultdb/internal/artifacts"
"go.chromium.org/luci/resultdb/internal/invocations"
"go.chromium.org/luci/resultdb/pbutil"
pb "go.chromium.org/luci/resultdb/proto/v1"
)
func verifyReadArtifactPermission(ctx context.Context, name string) error {
invIDStr, _, _, _, inputErr := pbutil.ParseArtifactName(name)
if inputErr != nil {
return appstatus.BadRequest(inputErr)
}
return verifyPermission(ctx, permGetArtifact, invocations.ID(invIDStr))
}
func validateGetArtifactRequest(req *pb.GetArtifactRequest) error {
if err := pbutil.ValidateArtifactName(req.Name); err != nil {
return errors.Annotate(err, "name").Err()
}
return nil
}
// GetArtifact implements pb.ResultDBServer.
func (s *resultDBServer) GetArtifact(ctx context.Context, in *pb.GetArtifactRequest) (*pb.Artifact, error) {
if err := verifyReadArtifactPermission(ctx, in.Name); err != nil {
return nil, err
}
if err := validateGetArtifactRequest(in); err != nil {
return nil, appstatus.BadRequest(err)
}
ctx, cancel := span.ReadOnlyTransaction(ctx)
defer cancel()
art, err := artifacts.Read(ctx, in.Name)
if err != nil {
return nil, err
}
if err := s.populateFetchURLs(ctx, art); err != nil {
return nil, err
}
return art, nil
}
// populateFetchURLs populates FetchUrl and FetchUrlExpiration fields
// of the artifacts.
//
// Must be called from within some gRPC request handler.
func (s *resultDBServer) populateFetchURLs(ctx context.Context, artifacts ...*pb.Artifact) error {
// Extract Host header (may be empty) from the request to use it as a basis
// for generating artifact URLs.
requestHost := ""
md, _ := metadata.FromIncomingContext(ctx)
if val := md.Get("host"); len(val) > 0 {
requestHost = val[0]
}
for _, a := range artifacts {
url, exp, err := s.generateArtifactURL(ctx, requestHost, a.Name)
if err != nil {
return err
}
a.FetchUrl = url
a.FetchUrlExpiration = pbutil.MustTimestampProto(exp)
}
return nil
}