1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42
43. 43
44. 44
45. 45
46. 46
47. 47
48. 48
49. 49
50. 50
51. 51
52. 52
53. 53
54. 54
55. 55
56. 56
57. 57
58. 58
59. 59
60. 60
61. 61
62. 62
63. 63
64. 64
65. 65
66. 66
67. 67
68. 68
69. 69
70. 70
71. 71
72. 72
73. 73
74. 74
75. 75
76. 76
77. 77
78. 78
79. 79
80. 80
81. 81
82. 82
83. 83
84. 84
85. 85
86. 86
87. 87
88. 88
89. 89
90. 90
91. 91
92. 92
93. 93
94. 94
95. 95
96. 96
97. 97
98. 98
99. 99
100. 100
101. 101
102. 102
103. 103
104. 104
105. 105
106. 106
107. 107
108. 108
109. 109
110. 110
111. 111
112. 112
113. 113
114. 114
115. 115
116. 116
117. 117
118. 118
119. 119
120. 120
121. 121
122. 122
123. 123
124. 124
125. 125
126. 126
127. 127
128. 128
129. 129
130. 130

// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package helm

import (
	"archive/tar"
	"compress/gzip"
	"errors"
	"io"
	"strings"

	"code.gitea.io/gitea/modules/validation"

	"github.com/hashicorp/go-version"
	"gopkg.in/yaml.v3"
)

var (
	// ErrMissingChartFile indicates a missing Chart.yaml file
	ErrMissingChartFile = errors.New("Chart.yaml file is missing")
	// ErrInvalidName indicates an invalid package name
	ErrInvalidName = errors.New("package name is invalid")
	// ErrInvalidVersion indicates an invalid package version
	ErrInvalidVersion = errors.New("package version is invalid")
	// ErrInvalidChart indicates an invalid chart
	ErrInvalidChart = errors.New("chart is invalid")
)

// Metadata for a Chart file. This models the structure of a Chart.yaml file.
type Metadata struct {
	APIVersion   string            `json:"api_version" yaml:"apiVersion"`
	Type         string            `json:"type,omitempty" yaml:"type,omitempty"`
	Name         string            `json:"name" yaml:"name"`
	Version      string            `json:"version" yaml:"version"`
	AppVersion   string            `json:"app_version,omitempty" yaml:"appVersion,omitempty"`
	Home         string            `json:"home,omitempty" yaml:"home,omitempty"`
	Sources      []string          `json:"sources,omitempty" yaml:"sources,omitempty"`
	Description  string            `json:"description,omitempty" yaml:"description,omitempty"`
	Keywords     []string          `json:"keywords,omitempty" yaml:"keywords,omitempty"`
	Maintainers  []*Maintainer     `json:"maintainers,omitempty" yaml:"maintainers,omitempty"`
	Icon         string            `json:"icon,omitempty" yaml:"icon,omitempty"`
	Condition    string            `json:"condition,omitempty" yaml:"condition,omitempty"`
	Tags         string            `json:"tags,omitempty" yaml:"tags,omitempty"`
	Deprecated   bool              `json:"deprecated,omitempty" yaml:"deprecated,omitempty"`
	Annotations  map[string]string `json:"annotations,omitempty" yaml:"annotations,omitempty"`
	KubeVersion  string            `json:"kube_version,omitempty" yaml:"kubeVersion,omitempty"`
	Dependencies []*Dependency     `json:"dependencies,omitempty" yaml:"dependencies,omitempty"`
}

type Maintainer struct {
	Name  string `json:"name,omitempty" yaml:"name,omitempty"`
	Email string `json:"email,omitempty" yaml:"email,omitempty"`
	URL   string `json:"url,omitempty" yaml:"url,omitempty"`
}

type Dependency struct {
	Name         string        `json:"name" yaml:"name"`
	Version      string        `json:"version,omitempty" yaml:"version,omitempty"`
	Repository   string        `json:"repository" yaml:"repository"`
	Condition    string        `json:"condition,omitempty" yaml:"condition,omitempty"`
	Tags         []string      `json:"tags,omitempty" yaml:"tags,omitempty"`
	Enabled      bool          `json:"enabled,omitempty" yaml:"enabled,omitempty"`
	ImportValues []interface{} `json:"import_values,omitempty" yaml:"import-values,omitempty"`
	Alias        string        `json:"alias,omitempty" yaml:"alias,omitempty"`
}

// ParseChartArchive parses the metadata of a Helm archive
func ParseChartArchive(r io.Reader) (*Metadata, error) {
	gzr, err := gzip.NewReader(r)
	if err != nil {
		return nil, err
	}
	defer gzr.Close()

	tr := tar.NewReader(gzr)
	for {
		hd, err := tr.Next()
		if err == io.EOF {
			break
		}
		if err != nil {
			return nil, err
		}

		if hd.Typeflag != tar.TypeReg {
			continue
		}

		if hd.FileInfo().Name() == "Chart.yaml" {
			if strings.Count(hd.Name, "/") != 1 {
				continue
			}

			return ParseChartFile(tr)
		}
	}

	return nil, ErrMissingChartFile
}

// ParseChartFile parses a Chart.yaml file to retrieve the metadata of a Helm chart
func ParseChartFile(r io.Reader) (*Metadata, error) {
	var metadata *Metadata
	if err := yaml.NewDecoder(r).Decode(&metadata); err != nil {
		return nil, err
	}

	if metadata.APIVersion == "" {
		return nil, ErrInvalidChart
	}

	if metadata.Type != "" && metadata.Type != "application" && metadata.Type != "library" {
		return nil, ErrInvalidChart
	}

	if metadata.Name == "" {
		return nil, ErrInvalidName
	}

	if _, err := version.NewSemver(metadata.Version); err != nil {
		return nil, ErrInvalidVersion
	}

	if !validation.IsValidURL(metadata.Home) {
		metadata.Home = ""
	}

	return metadata, nil
}