github.com/oam-dev/kubevela@v1.9.11/hack/utils/common.go (about)

     1  /*
     2  Copyright 2021 The KubeVela Authors.
     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 utils
    18  
    19  import (
    20  	"bytes"
    21  	"encoding/base64"
    22  	"fmt"
    23  	"io"
    24  	"os"
    25  	"strings"
    26  
    27  	helm "helm.sh/helm/v3/pkg/action"
    28  	"helm.sh/helm/v3/pkg/chart"
    29  	"helm.sh/helm/v3/pkg/chart/loader"
    30  )
    31  
    32  // FprintZipData converts zip binary contents to a string literal.
    33  // From https://github.com/rakyll/statik/blob/master/statik.go#L313
    34  func FprintZipData(dest *bytes.Buffer, zipData []byte) {
    35  	for _, b := range zipData {
    36  		if b == '\n' {
    37  			dest.WriteString(`\n`)
    38  			continue
    39  		}
    40  		if b == '\\' {
    41  			dest.WriteString(`\\`)
    42  			continue
    43  		}
    44  		if b == '"' {
    45  			dest.WriteString(`\"`)
    46  			continue
    47  		}
    48  		if (b >= 32 && b <= 126) || b == '\t' {
    49  			dest.WriteByte(b)
    50  			continue
    51  		}
    52  		fmt.Fprintf(dest, "\\x%02x", b)
    53  	}
    54  }
    55  
    56  // GetChartSource is a helper to convert a filepath to a chart to a
    57  // base64-encoded, gzipped tarball.
    58  func GetChartSource(path string) (string, error) {
    59  	pack := helm.NewPackage()
    60  	packagedPath, err := pack.Run(path, nil)
    61  	if err != nil {
    62  		return "", err
    63  	}
    64  	defer os.Remove(packagedPath)
    65  	packaged, err := os.ReadFile(packagedPath)
    66  	if err != nil {
    67  		return "", err
    68  	}
    69  	b64Encoded := bytes.NewBuffer(nil)
    70  	enc := base64.NewEncoder(base64.StdEncoding, b64Encoded)
    71  	_, err = io.Copy(enc, bytes.NewReader(packaged))
    72  	if err != nil {
    73  		return "", err
    74  	}
    75  	return b64Encoded.String(), nil
    76  }
    77  
    78  // LoadChart is a helper to turn a base64-encoded, gzipped tarball into a chart.
    79  func LoadChart(source string) (*chart.Chart, error) {
    80  	dec := base64.NewDecoder(base64.StdEncoding, strings.NewReader(source))
    81  	tgz := bytes.NewBuffer(nil)
    82  	_, err := io.Copy(tgz, dec)
    83  	if err != nil {
    84  		return nil, err
    85  	}
    86  	return loader.LoadArchive(tgz)
    87  }