forked from TrueCloudLab/distribution
76 lines
2.3 KiB
Go
76 lines
2.3 KiB
Go
package auth
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import (
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"fmt"
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"net/http"
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)
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// Resource describes a resource by type and name.
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type Resource struct {
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Type string
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Name string
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}
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// Access describes a specific action that is
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// requested or allowed for a given recource.
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type Access struct {
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Resource
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Action string
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}
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// Challenge is a special error type which is used for HTTP 401 Unauthorized
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// responses and is able to write the response with WWW-Authenticate challenge
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// header values based on the error.
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type Challenge interface {
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error
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Status() int
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SetHeader(header http.Header)
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ServeHTTP(w http.ResponseWriter, r *http.Request)
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}
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// AccessController controls access to registry resources based on a request
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// and required access levels for a request. Implementations can support both
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// complete denial and http authorization challenges.
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type AccessController interface {
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// Authorized returns non-nil if the request is granted the request
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// access. If the error is non-nil, access should always be denied. The
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// error may be of type Challenge, in which case the caller may have the
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// Challenge handle the request or choose what action to take based on the
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// Challenge header or response status.
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//
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// In the future, other error types, besides Challenge, may be added to
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// support more complex authorization flows.
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Authorized(req *http.Request, access ...Access) error
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}
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// InitFunc is the type of an AccessController factory function and is used
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// to register the contsructor for different AccesController backends.
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type InitFunc func(options map[string]interface{}) (AccessController, error)
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var accessControllers map[string]InitFunc
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func init() {
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accessControllers = make(map[string]InitFunc)
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}
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// Register is used to register an InitFunc for
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// an AccessController backend with the given name.
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func Register(name string, initFunc InitFunc) error {
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if _, exists := accessControllers[name]; exists {
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return fmt.Errorf("name already registered: %s", name)
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}
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accessControllers[name] = initFunc
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return nil
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}
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// GetAccessController constructs an AccessController
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// with the given options using the named backend.
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func GetAccessController(name string, options map[string]interface{}) (AccessController, error) {
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if initFunc, exists := accessControllers[name]; exists {
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return initFunc(options)
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}
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return nil, fmt.Errorf("no access controller registered with name: %s", name)
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}
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