go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/cipd/appengine/impl/cas/acled.go (about)

     1  // Copyright 2017 The LUCI Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package cas
    16  
    17  import (
    18  	"context"
    19  
    20  	"google.golang.org/grpc/codes"
    21  	"google.golang.org/grpc/status"
    22  
    23  	api "go.chromium.org/luci/cipd/api/cipd/v1"
    24  	"go.chromium.org/luci/cipd/appengine/impl/rpcacl"
    25  )
    26  
    27  // Public returns publicly exposed implementation of cipd.Storage service that
    28  // wraps the given internal implementation with ACLs.
    29  func Public(internal api.StorageServer) api.StorageServer {
    30  	return &acledStorage{internal: internal}
    31  }
    32  
    33  type acledStorage struct {
    34  	// We want the compilation to fail when new methods are added.
    35  	api.UnsafeStorageServer
    36  
    37  	internal api.StorageServer
    38  }
    39  
    40  func (s *acledStorage) GetObjectURL(ctx context.Context, req *api.GetObjectURLRequest) (*api.ObjectURL, error) {
    41  	if err := rpcacl.CheckAdmin(ctx); err != nil {
    42  		return nil, err
    43  	}
    44  	return s.internal.GetObjectURL(ctx, req)
    45  }
    46  
    47  func (s *acledStorage) BeginUpload(ctx context.Context, req *api.BeginUploadRequest) (*api.UploadOperation, error) {
    48  	if err := rpcacl.CheckAdmin(ctx); err != nil {
    49  		return nil, err
    50  	}
    51  	return s.internal.BeginUpload(ctx, req)
    52  }
    53  
    54  // Upload operations are initiated by the backend, but finalized by whoever
    55  // uploads the data, thus 'FinishUpload' and 'CancelUpload' is accessible to
    56  // anyone (the authorization happens through upload operation IDs which should
    57  // be treated as secrets). Except we don't trust external API users to assign
    58  // hashes, so usage of 'force_hash' field is forbidden.
    59  
    60  func (s *acledStorage) FinishUpload(ctx context.Context, req *api.FinishUploadRequest) (*api.UploadOperation, error) {
    61  	if req.ForceHash != nil {
    62  		return nil, status.Errorf(codes.PermissionDenied, "usage of 'force_hash' is forbidden")
    63  	}
    64  	return s.internal.FinishUpload(ctx, req)
    65  }
    66  
    67  func (s *acledStorage) CancelUpload(ctx context.Context, req *api.CancelUploadRequest) (*api.UploadOperation, error) {
    68  	return s.internal.CancelUpload(ctx, req)
    69  }