[#746] added microsoft oauth2 provider

tools/auth/microsoft.go

@@ -0,0 +1,50 @@
+package auth
+
+import (
+	"golang.org/x/oauth2"
+	"golang.org/x/oauth2/microsoft"
+)
+
+var _ Provider = (*Microsoft)(nil)
+
+// NameMicrosoft is the unique name of the Microsoft provider.
+const NameMicrosoft string = "microsoft"
+
+// Microsoft allows authentication via AzureADEndpoint OAuth2.
+type Microsoft struct {
+	*baseProvider
+}
+
+// NewMicrosoftProvider creates new Microsoft AD provider instance with some defaults.
+func NewMicrosoftProvider() *Microsoft {
+	endpoints := microsoft.AzureADEndpoint("")
+	return &Microsoft{&baseProvider{
+		scopes:     []string{"User.Read"},
+		authUrl:    endpoints.AuthURL,
+		tokenUrl:   endpoints.TokenURL,
+		userApiUrl: "https://graph.microsoft.com/v1.0/me",
+	}}
+}
+
+// FetchAuthUser returns an AuthUser instance based on the Microsoft's user api.
+func (p *Microsoft) FetchAuthUser(token *oauth2.Token) (*AuthUser, error) {
+	// https://learn.microsoft.com/en-us/azure/active-directory/develop/userinfo
+	// explore graph: https://developer.microsoft.com/en-us/graph/graph-explorer
+	rawData := struct {
+		Id    string `json:"id"`
+		Name  string `json:"displayName"`
+		Email string `json:"mail"`
+	}{}
+
+	if err := p.FetchRawUserData(token, &rawData); err != nil {
+		return nil, err
+	}
+
+	user := &AuthUser{
+		Id:    rawData.Id,
+		Name:  rawData.Name,
+		Email: rawData.Email,
+	}
+
+	return user, nil
+}