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// Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
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 overridden 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
}
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