126 lines
3.7 KiB
Go
126 lines
3.7 KiB
Go
// Package auth provides authentication and authorization capability
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package auth
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import (
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"context"
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"errors"
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"time"
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)
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var (
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// ErrNotFound is returned when a resouce cannot be found
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ErrNotFound = errors.New("not found")
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// ErrEncodingToken is returned when the service encounters an error during encoding
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ErrEncodingToken = errors.New("error encoding the token")
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// ErrInvalidToken is returned when the token provided is not valid
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ErrInvalidToken = errors.New("invalid token provided")
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// ErrInvalidRole is returned when the role provided was invalid
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ErrInvalidRole = errors.New("invalid role")
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// ErrForbidden is returned when a user does not have the necessary roles to access a resource
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ErrForbidden = errors.New("resource forbidden")
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)
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// Auth providers authentication and authorization
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type Auth interface {
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// Init the auth
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Init(opts ...Option)
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// Options set for auth
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Options() Options
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// Generate a new account
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Generate(id string, opts ...GenerateOption) (*Account, error)
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// Grant access to a resource
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Grant(role string, res *Resource) error
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// Revoke access to a resource
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Revoke(role string, res *Resource) error
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// Verify an account has access to a resource
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Verify(acc *Account, res *Resource) error
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// Inspect a token
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Inspect(token string) (*Account, error)
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// Token generated using refresh token
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Token(opts ...TokenOption) (*Token, error)
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// String returns the name of the implementation
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String() string
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}
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// Resource is an entity such as a user or
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type Resource struct {
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// Name of the resource
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Name string `json:"name"`
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// Type of resource, e.g.
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Type string `json:"type"`
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// Endpoint resource e.g NotesService.Create
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Endpoint string `json:"endpoint"`
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// Namespace the resource belongs to
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Namespace string `json:"namespace"`
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}
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// Account provided by an auth provider
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type Account struct {
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// ID of the account e.g. email
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ID string `json:"id"`
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// Type of the account, e.g. service
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Type string `json:"type"`
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// Provider who issued the account
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Provider string `json:"provider"`
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// Roles associated with the Account
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Roles []string `json:"roles"`
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// Any other associated metadata
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Metadata map[string]string `json:"metadata"`
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// Namespace the account belongs to
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Namespace string `json:"namespace"`
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// Secret for the account, e.g. the password
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Secret string `json:"secret"`
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}
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// HasRole returns a boolean indicating if the account has the given role
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func (a *Account) HasRole(role string) bool {
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if a.Roles == nil {
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return false
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}
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for _, r := range a.Roles {
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if r == role {
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return true
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}
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}
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return false
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}
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// Token can be short or long lived
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type Token struct {
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// The token to be used for accessing resources
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AccessToken string `json:"access_token"`
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// RefreshToken to be used to generate a new token
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RefreshToken string `json:"refresh_token"`
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// Time of token creation
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Created time.Time `json:"created"`
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// Time of token expiry
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Expiry time.Time `json:"expiry"`
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}
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const (
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// DefaultNamespace used for auth
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DefaultNamespace = "go.micro"
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// TokenCookieName is the name of the cookie which stores the auth token
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TokenCookieName = "micro-token"
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// BearerScheme used for Authorization header
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BearerScheme = "Bearer "
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)
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type accountKey struct{}
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// AccountFromContext gets the account from the context, which
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// is set by the auth wrapper at the start of a call. If the account
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// is not set, a nil account will be returned. The error is only returned
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// when there was a problem retrieving an account
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func AccountFromContext(ctx context.Context) (*Account, bool) {
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acc, ok := ctx.Value(accountKey{}).(*Account)
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return acc, ok
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}
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// ContextWithAccount sets the account in the context
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func ContextWithAccount(ctx context.Context, account *Account) context.Context {
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return context.WithValue(ctx, accountKey{}, account)
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}
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