128 lines
3.8 KiB
Go
128 lines
3.8 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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// BearerScheme used for Authorization header
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const BearerScheme = "Bearer "
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var (
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// ErrInvalidToken is when the token provided is not valid
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ErrInvalidToken = errors.New("invalid token provided")
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// ErrForbidden is when a user does not have the necessary scope 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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// Verify an account has access to a resource using the rules
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Verify(acc *Account, res *Resource, opts ...VerifyOption) 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 or credentials
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Token(opts ...TokenOption) (*Token, error)
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// Grant access to a resource
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Grant(rule *Rule) error
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// Revoke access to a resource
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Revoke(rule *Rule) error
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// Rules returns all the rules used to verify requests
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Rules() ([]*Rule, 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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// 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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// Any other associated metadata
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Metadata map[string]string `json:"metadata"`
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// Scopes the account has access to
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Scopes []string `json:"scopes"`
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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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// 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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// Expired returns a boolean indicating if the token needs to be refreshed
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func (t *Token) Expired() bool {
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return t.Expiry.Unix() < time.Now().Unix()
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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, e.g. go.micro.service.notes
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Name string `json:"name"`
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// Type of resource, e.g. service
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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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}
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// Access defines the type of access a rule grants
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type Access int
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const (
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// AccessGranted to a resource
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AccessGranted Access = iota
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// AccessDenied to a resource
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AccessDenied
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)
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// Rule is used to verify access to a resource
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type Rule struct {
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// ID of the rule, e.g. "public"
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ID string
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// Scope the rule requires, a blank scope indicates open to the public and * indicates the rule
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// applies to any valid account
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Scope string
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// Resource the rule applies to
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Resource *Resource
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// Access determines if the rule grants or denies access to the resource
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Access Access
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// Priority the rule should take when verifying a request, the higher the value the sooner the
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// rule will be applied
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Priority int32
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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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