forgejo-federation/vendor/github.com/markbates/goth/providers/azureadv2/azureadv2.go
zeripath ab9bb54144
Add microsoft oauth2 providers (#16544)
* Clean up oauth2 providers

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Add AzureAD, AzureADv2, MicrosoftOnline OAuth2 providers

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Apply suggestions from code review

* remove unused Scopes

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2021-08-05 21:11:08 -04:00

233 lines
7.3 KiB
Go
Vendored

package azureadv2
import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"github.com/markbates/goth"
"golang.org/x/oauth2"
)
// also https://docs.microsoft.com/en-us/azure/active-directory/develop/active-directory-v2-protocols#endpoints
const (
authURLTemplate string = "https://login.microsoftonline.com/%s/oauth2/v2.0/authorize"
tokenURLTemplate string = "https://login.microsoftonline.com/%s/oauth2/v2.0/token"
graphAPIResource string = "https://graph.microsoft.com/v1.0/"
)
type (
// TenantType are the well known tenant types to scope the users that can authenticate. TenantType is not an
// exclusive list of Azure Tenants which can be used. A consumer can also use their own Tenant ID to scope
// authentication to their specific Tenant either through the Tenant ID or the friendly domain name.
//
// see also https://docs.microsoft.com/en-us/azure/active-directory/develop/active-directory-v2-protocols#endpoints
TenantType string
// Provider is the implementation of `goth.Provider` for accessing AzureAD V2.
Provider struct {
ClientKey string
Secret string
CallbackURL string
HTTPClient *http.Client
config *oauth2.Config
providerName string
}
// ProviderOptions are the collection of optional configuration to provide when constructing a Provider
ProviderOptions struct {
Scopes []ScopeType
Tenant TenantType
}
)
// These are the well known Azure AD Tenants. These are not an exclusive list of all Tenants
//
// See also https://docs.microsoft.com/en-us/azure/active-directory/develop/active-directory-v2-protocols#endpoints
const (
// CommonTenant allows users with both personal Microsoft accounts and work/school accounts from Azure Active
// Directory to sign into the application.
CommonTenant TenantType = "common"
// OrganizationsTenant allows only users with work/school accounts from Azure Active Directory to sign into the application.
OrganizationsTenant TenantType = "organizations"
// ConsumersTenant allows only users with personal Microsoft accounts (MSA) to sign into the application.
ConsumersTenant TenantType = "consumers"
)
// New creates a new AzureAD provider, and sets up important connection details.
// You should always call `AzureAD.New` to get a new Provider. Never try to create
// one manually.
func New(clientKey, secret, callbackURL string, opts ProviderOptions) *Provider {
p := &Provider{
ClientKey: clientKey,
Secret: secret,
CallbackURL: callbackURL,
providerName: "azureadv2",
}
p.config = newConfig(p, opts)
return p
}
func newConfig(provider *Provider, opts ProviderOptions) *oauth2.Config {
tenant := opts.Tenant
if tenant == "" {
tenant = CommonTenant
}
c := &oauth2.Config{
ClientID: provider.ClientKey,
ClientSecret: provider.Secret,
RedirectURL: provider.CallbackURL,
Endpoint: oauth2.Endpoint{
AuthURL: fmt.Sprintf(authURLTemplate, tenant),
TokenURL: fmt.Sprintf(tokenURLTemplate, tenant),
},
Scopes: []string{},
}
if len(opts.Scopes) > 0 {
c.Scopes = append(c.Scopes, scopesToStrings(opts.Scopes...)...)
} else {
defaultScopes := scopesToStrings(OpenIDScope, ProfileScope, EmailScope, UserReadScope)
c.Scopes = append(c.Scopes, defaultScopes...)
}
return c
}
// Name is the name used to retrieve this provider later.
func (p *Provider) Name() string {
return p.providerName
}
// SetName is to update the name of the provider (needed in case of multiple providers of 1 type)
func (p *Provider) SetName(name string) {
p.providerName = name
}
// Client is HTTP client to be used in all fetch operations.
func (p *Provider) Client() *http.Client {
return goth.HTTPClientWithFallBack(p.HTTPClient)
}
// Debug is a no-op for the package
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks for an authentication end-point for AzureAD.
func (p *Provider) BeginAuth(state string) (goth.Session, error) {
authURL := p.config.AuthCodeURL(state)
return &Session{
AuthURL: authURL,
}, nil
}
// FetchUser will go to AzureAD and access basic information about the user.
func (p *Provider) FetchUser(session goth.Session) (goth.User, error) {
msSession := session.(*Session)
user := goth.User{
AccessToken: msSession.AccessToken,
Provider: p.Name(),
ExpiresAt: msSession.ExpiresAt,
}
if user.AccessToken == "" {
return user, fmt.Errorf("%s cannot get user information without accessToken", p.providerName)
}
req, err := http.NewRequest("GET", graphAPIResource+"me", nil)
if err != nil {
return user, err
}
req.Header.Set(authorizationHeader(msSession))
response, err := p.Client().Do(req)
if err != nil {
return user, err
}
defer response.Body.Close()
if response.StatusCode != http.StatusOK {
return user, fmt.Errorf("%s responded with a %d trying to fetch user information", p.providerName, response.StatusCode)
}
err = userFromReader(response.Body, &user)
user.AccessToken = msSession.AccessToken
user.RefreshToken = msSession.RefreshToken
user.ExpiresAt = msSession.ExpiresAt
return user, err
}
//RefreshTokenAvailable refresh token is provided by auth provider or not
func (p *Provider) RefreshTokenAvailable() bool {
return true
}
//RefreshToken get new access token based on the refresh token
func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
token := &oauth2.Token{RefreshToken: refreshToken}
ts := p.config.TokenSource(goth.ContextForClient(p.Client()), token)
newToken, err := ts.Token()
if err != nil {
return nil, err
}
return newToken, err
}
func authorizationHeader(session *Session) (string, string) {
return "Authorization", fmt.Sprintf("Bearer %s", session.AccessToken)
}
func userFromReader(r io.Reader, user *goth.User) error {
u := struct {
ID string `json:"id"` // The unique identifier for the user.
BusinessPhones []string `json:"businessPhones"` // The user's phone numbers.
DisplayName string `json:"displayName"` // The name displayed in the address book for the user.
FirstName string `json:"givenName"` // The first name of the user.
JobTitle string `json:"jobTitle"` // The user's job title.
Email string `json:"mail"` // The user's email address.
MobilePhone string `json:"mobilePhone"` // The user's cellphone number.
OfficeLocation string `json:"officeLocation"` // The user's physical office location.
PreferredLanguage string `json:"preferredLanguage"` // The user's language of preference.
LastName string `json:"surname"` // The last name of the user.
UserPrincipalName string `json:"userPrincipalName"` // The user's principal name.
}{}
userBytes, err := ioutil.ReadAll(r)
if err != nil {
return err
}
if err := json.Unmarshal(userBytes, &u); err != nil {
return err
}
user.Email = u.Email
user.Name = u.DisplayName
user.FirstName = u.FirstName
user.LastName = u.LastName
user.NickName = u.DisplayName
user.Location = u.OfficeLocation
user.UserID = u.ID
user.AvatarURL = graphAPIResource + fmt.Sprintf("users/%s/photo/$value", u.ID)
// Make sure all of the information returned is available via RawData
if err := json.Unmarshal(userBytes, &user.RawData); err != nil {
return err
}
return nil
}
func scopesToStrings(scopes ...ScopeType) []string {
strs := make([]string, len(scopes))
for i := 0; i < len(scopes); i++ {
strs[i] = string(scopes[i])
}
return strs
}