asteris-llc/converge

// Copyright © 2016 Asteris, LLC
//
// 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 rpc

import (
    "io/ioutil"
    "path"
    "strings"

    "github.com/asteris-llc/converge/rpc/pb"
    "github.com/golang/protobuf/ptypes/empty"
    "github.com/kardianos/osext"
    "github.com/pkg/errors"
    "golang.org/x/net/context"
)

type resourceHost struct {
    root                 string
    enableBinaryDownload bool
}

func (rh *resourceHost) GetBinary(ctx context.Context, _ *empty.Empty) (*pb.ContentResponse, error) {
    logger := getLogger(ctx).WithField("function", "resourceHost.GetBinary")

    if !rh.enableBinaryDownload {
        logger.Debug("got request for binary, but binary download not enabled")
        return nil, errors.New("binary download not enabled")
    }

    name, err := osext.Executable()
    if err != nil {
        logger.WithError(err).Error("could not determine binary location")
        return nil, errors.Wrap(err, "could not determine binary location")
    }

    content, err := ioutil.ReadFile(name)
    if err != nil {
        logger.WithError(err).Error("could not read binary")
        return nil, errors.Wrap(err, "could not read binary")
    }

    return &pb.ContentResponse{Content: string(content)}, nil
}

func (rh *resourceHost) GetModule(ctx context.Context, loc *pb.LoadRequest) (*pb.ContentResponse, error) {
    logger := getLogger(ctx).WithField("function", "resourceHost.GetModule").WithField("location", loc.Location)

    if rh.root == "" {
        logger.Debug("got request for module, but module download not enabled")
        return nil, errors.New("module download not enabled")
    }

    if strings.Contains(loc.Location, "..") {
        logger.Warning("got request for relative path")
        return nil, errors.New("cannot use relative paths")
    }

    content, err := ioutil.ReadFile(path.Join(rh.root, loc.Location))
    if err != nil {
        logger.WithError(err).Error("could not read location")
        return nil, errors.Wrap(err, "could not read location")
    }

    return &pb.ContentResponse{Content: string(content)}, nil
}