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
131. 131
132. 132
133. 133
134. 134
135. 135
136. 136
137. 137
138. 138
139. 139
140. 140
141. 141
142. 142
143. 143
144. 144
145. 145
146. 146
147. 147
148. 148
149. 149
150. 150
151. 151
152. 152
153. 153
154. 154
155. 155
156. 156
157. 157
158. 158
159. 159
160. 160
161. 161
162. 162
163. 163
164. 164
165. 165
166. 166
167. 167
168. 168

// Copyright 2021 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package oauth2

import (
	"errors"
	"net/url"
	"sort"

	"code.gitea.io/gitea/models/auth"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/setting"

	"github.com/markbates/goth"
)

// Provider is an interface for describing a single OAuth2 provider
type Provider interface {
	Name() string
	DisplayName() string
	Image() string
	CustomURLSettings() *CustomURLSettings
}

// GothProviderCreator provides a function to create a goth.Provider
type GothProviderCreator interface {
	CreateGothProvider(providerName, callbackURL string, source *Source) (goth.Provider, error)
}

// GothProvider is an interface for describing a single OAuth2 provider
type GothProvider interface {
	Provider
	GothProviderCreator
}

// ImagedProvider provide an overrided image setting for the provider
type ImagedProvider struct {
	GothProvider
	image string
}

// Image returns the image path for this provider
func (i *ImagedProvider) Image() string {
	return i.image
}

// NewImagedProvider is a constructor function for the ImagedProvider
func NewImagedProvider(image string, provider GothProvider) *ImagedProvider {
	return &ImagedProvider{
		GothProvider: provider,
		image:        image,
	}
}

// Providers contains the map of registered OAuth2 providers in Gitea (based on goth)
// key is used to map the OAuth2Provider with the goth provider type (also in AuthSource.OAuth2Config.Provider)
// value is used to store display data
var gothProviders = map[string]GothProvider{}

// RegisterGothProvider registers a GothProvider
func RegisterGothProvider(provider GothProvider) {
	if _, has := gothProviders[provider.Name()]; has {
		log.Fatal("Duplicate oauth2provider type provided: %s", provider.Name())
	}
	gothProviders[provider.Name()] = provider
}

// GetOAuth2Providers returns the map of unconfigured OAuth2 providers
// key is used as technical name (like in the callbackURL)
// values to display
func GetOAuth2Providers() []Provider {
	providers := make([]Provider, 0, len(gothProviders))

	for _, provider := range gothProviders {
		providers = append(providers, provider)
	}
	sort.Slice(providers, func(i, j int) bool {
		return providers[i].Name() < providers[j].Name()
	})
	return providers
}

// GetActiveOAuth2Providers returns the map of configured active OAuth2 providers
// key is used as technical name (like in the callbackURL)
// values to display
func GetActiveOAuth2Providers() ([]string, map[string]Provider, error) {
	// Maybe also separate used and unused providers so we can force the registration of only 1 active provider for each type

	authSources, err := auth.GetActiveOAuth2ProviderSources()
	if err != nil {
		return nil, nil, err
	}

	var orderedKeys []string
	providers := make(map[string]Provider)
	for _, source := range authSources {
		prov := gothProviders[source.Cfg.(*Source).Provider]
		if source.Cfg.(*Source).IconURL != "" {
			prov = &ImagedProvider{prov, source.Cfg.(*Source).IconURL}
		}
		providers[source.Name] = prov
		orderedKeys = append(orderedKeys, source.Name)
	}

	sort.Strings(orderedKeys)

	return orderedKeys, providers, nil
}

// RegisterProviderWithGothic register a OAuth2 provider in goth lib
func RegisterProviderWithGothic(providerName string, source *Source) error {
	provider, err := createProvider(providerName, source)

	if err == nil && provider != nil {
		gothRWMutex.Lock()
		defer gothRWMutex.Unlock()

		goth.UseProviders(provider)
	}

	return err
}

// RemoveProviderFromGothic removes the given OAuth2 provider from the goth lib
func RemoveProviderFromGothic(providerName string) {
	gothRWMutex.Lock()
	defer gothRWMutex.Unlock()

	delete(goth.GetProviders(), providerName)
}

// ClearProviders clears all OAuth2 providers from the goth lib
func ClearProviders() {
	gothRWMutex.Lock()
	defer gothRWMutex.Unlock()

	goth.ClearProviders()
}

// ErrAuthSourceNotActived login source is not actived error
var ErrAuthSourceNotActived = errors.New("auth source is not actived")

// used to create different types of goth providers
func createProvider(providerName string, source *Source) (goth.Provider, error) {
	callbackURL := setting.AppURL + "user/oauth2/" + url.PathEscape(providerName) + "/callback"

	var provider goth.Provider
	var err error

	p, ok := gothProviders[source.Provider]
	if !ok {
		return nil, ErrAuthSourceNotActived
	}

	provider, err = p.CreateGothProvider(providerName, callbackURL, source)
	if err != nil {
		return provider, err
	}

	// always set the name if provider is created so we can support multiple setups of 1 provider
	if err == nil && provider != nil {
		provider.SetName(providerName)
	}

	return provider, err
}