zipbased.go

Documentation: github.com/sassoftware/relic/signers/zipbased

     1  //
     2  // Copyright (c) SAS Institute Inc.
     3  //
     4  // Licensed under the Apache License, Version 2.0 (the "License");
     5  // you may not use this file except in compliance with the License.
     6  // You may obtain a copy of the License at
     7  //
     8  //     http://www.apache.org/licenses/LICENSE-2.0
     9  //
    10  // Unless required by applicable law or agreed to in writing, software
    11  // distributed under the License is distributed on an "AS IS" BASIS,
    12  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  // See the License for the specific language governing permissions and
    14  // limitations under the License.
    15  //
    16  
    17  package zipbased
    18  
    19  import (
    20  	"io"
    21  	"os"
    22  
    23  	"github.com/sassoftware/relic/lib/zipslicer"
    24  	"github.com/sassoftware/relic/signers"
    25  )
    26  
    27  type zipTransformer struct {
    28  	f *os.File
    29  }
    30  
    31  func Transform(f *os.File, opts signers.SignOpts) (signers.Transformer, error) {
    32  	return &zipTransformer{f}, nil
    33  }
    34  
    35  // Wrap the zip in a tarball with the central directory first so that it can be
    36  // processed as a stream
    37  func (t *zipTransformer) GetReader() (io.Reader, error) {
    38  	r, w := io.Pipe()
    39  	go func() {
    40  		w.CloseWithError(zipslicer.ZipToTar(t.f, w))
    41  	}()
    42  	return r, nil
    43  }
    44  
    45  func (t *zipTransformer) Apply(dest, mimeType string, result io.Reader) error {
    46  	return signers.ApplyBinPatch(t.f, dest, result)
    47  }
    48
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