package registry
 
 import (

 	"errors"

 	"fmt"
 	"net"
 	"net/url"

 	"strings"

 
 	"github.com/docker/docker/opts"
 	flag "github.com/docker/docker/pkg/mflag"

 	"github.com/docker/docker/reference"

 	registrytypes "github.com/docker/engine-api/types/registry"

 )
 
 // Options holds command line options.
 type Options struct {
 	Mirrors            opts.ListOpts
 	InsecureRegistries opts.ListOpts
 }
 

 const (
 	// DefaultNamespace is the default namespace
 	DefaultNamespace = "docker.io"
 	// DefaultRegistryVersionHeader is the name of the default HTTP header
 	// that carries Registry version info
 	DefaultRegistryVersionHeader = "Docker-Distribution-Api-Version"
 
 	// IndexServer is the v1 registry server used for user auth + account creation
 	IndexServer = DefaultV1Registry + "/v1/"
 	// IndexName is the name of the index
 	IndexName = "docker.io"
 
 	// NotaryServer is the endpoint serving the Notary trust server
 	NotaryServer = "https://notary.docker.io"
 
 	// IndexServer = "https://registry-stage.hub.docker.com/v1/"
 )
 

 var (

 	// ErrInvalidRepositoryName is an error returned if the repository name did
 	// not have the correct form

 	ErrInvalidRepositoryName = errors.New("Invalid repository name (ex: \"registry.domain.tld/myrepos\")")

 
 	emptyServiceConfig = NewServiceConfig(nil)

 
 	// V2Only controls access to legacy registries.  If it is set to true via the
 	// command line flag the daemon will not attempt to contact v1 legacy registries
 	V2Only = false

 )
 

 // InstallFlags adds command-line options to the top-level flag parser for
 // the current process.

 func (options *Options) InstallFlags(cmd *flag.FlagSet, usageFn func(string) string) {

 	options.Mirrors = opts.NewListOpts(ValidateMirror)

 	cmd.Var(&options.Mirrors, []string{"-registry-mirror"}, usageFn("Preferred Docker registry mirror"))

 	options.InsecureRegistries = opts.NewListOpts(ValidateIndexName)

 	cmd.Var(&options.InsecureRegistries, []string{"-insecure-registry"}, usageFn("Enable insecure registry communication"))

 	cmd.BoolVar(&V2Only, []string{"-disable-legacy-registry"}, false, usageFn("Do not contact legacy registries"))

 }
 
 // NewServiceConfig returns a new instance of ServiceConfig

 func NewServiceConfig(options *Options) *registrytypes.ServiceConfig {

 	if options == nil {
 		options = &Options{
 			Mirrors:            opts.NewListOpts(nil),
 			InsecureRegistries: opts.NewListOpts(nil),
 		}
 	}
 
 	// Localhost is by default considered as an insecure registry
 	// This is a stop-gap for people who are running a private registry on localhost (especially on Boot2docker).
 	//
 	// TODO: should we deprecate this once it is easier for people to set up a TLS registry or change
 	// daemon flags on boot2docker?
 	options.InsecureRegistries.Set("127.0.0.0/8")
 

 	config := &registrytypes.ServiceConfig{
 		InsecureRegistryCIDRs: make([]*registrytypes.NetIPNet, 0),
 		IndexConfigs:          make(map[string]*registrytypes.IndexInfo, 0),

 		// Hack: Bypass setting the mirrors to IndexConfigs since they are going away
 		// and Mirrors are only for the official registry anyways.
 		Mirrors: options.Mirrors.GetAll(),

 	}
 	// Split --insecure-registry into CIDR and registry-specific settings.
 	for _, r := range options.InsecureRegistries.GetAll() {
 		// Check if CIDR was passed to --insecure-registry
 		_, ipnet, err := net.ParseCIDR(r)
 		if err == nil {
 			// Valid CIDR.

 			config.InsecureRegistryCIDRs = append(config.InsecureRegistryCIDRs, (*registrytypes.NetIPNet)(ipnet))

 		} else {
 			// Assume `host:port` if not CIDR.

 			config.IndexConfigs[r] = &registrytypes.IndexInfo{

 				Name:     r,
 				Mirrors:  make([]string, 0),
 				Secure:   false,
 				Official: false,
 			}
 		}
 	}
 
 	// Configure public registry.

 	config.IndexConfigs[IndexName] = &registrytypes.IndexInfo{

 		Name:     IndexName,

 		Mirrors:  config.Mirrors,

 		Secure:   true,
 		Official: true,
 	}
 
 	return config
 }

 
 // isSecureIndex returns false if the provided indexName is part of the list of insecure registries
 // Insecure registries accept HTTP and/or accept HTTPS with certificates from unknown CAs.
 //
 // The list of insecure registries can contain an element with CIDR notation to specify a whole subnet.
 // If the subnet contains one of the IPs of the registry specified by indexName, the latter is considered
 // insecure.
 //
 // indexName should be a URL.Host (`host:port` or `host`) where the `host` part can be either a domain name
 // or an IP address. If it is a domain name, then it will be resolved in order to check if the IP is contained
 // in a subnet. If the resolving is not successful, isSecureIndex will only try to match hostname to any element
 // of insecureRegistries.

 func isSecureIndex(config *registrytypes.ServiceConfig, indexName string) bool {

 	// Check for configured index, first.  This is needed in case isSecureIndex

 	// is called from anything besides newIndexInfo, in order to honor per-index configurations.

 	if index, ok := config.IndexConfigs[indexName]; ok {
 		return index.Secure
 	}
 
 	host, _, err := net.SplitHostPort(indexName)
 	if err != nil {
 		// assume indexName is of the form `host` without the port and go on.
 		host = indexName
 	}
 
 	addrs, err := lookupIP(host)
 	if err != nil {
 		ip := net.ParseIP(host)
 		if ip != nil {
 			addrs = []net.IP{ip}
 		}
 
 		// if ip == nil, then `host` is neither an IP nor it could be looked up,
 		// either because the index is unreachable, or because the index is behind an HTTP proxy.
 		// So, len(addrs) == 0 and we're not aborting.
 	}
 
 	// Try CIDR notation only if addrs has any elements, i.e. if `host`'s IP could be determined.
 	for _, addr := range addrs {
 		for _, ipnet := range config.InsecureRegistryCIDRs {
 			// check if the addr falls in the subnet
 			if (*net.IPNet)(ipnet).Contains(addr) {
 				return false
 			}
 		}
 	}
 
 	return true
 }
 
 // ValidateMirror validates an HTTP(S) registry mirror
 func ValidateMirror(val string) (string, error) {
 	uri, err := url.Parse(val)
 	if err != nil {
 		return "", fmt.Errorf("%s is not a valid URI", val)
 	}
 
 	if uri.Scheme != "http" && uri.Scheme != "https" {
 		return "", fmt.Errorf("Unsupported scheme %s", uri.Scheme)
 	}
 
 	if uri.Path != "" || uri.RawQuery != "" || uri.Fragment != "" {
 		return "", fmt.Errorf("Unsupported path/query/fragment at end of the URI")
 	}
 

 	return fmt.Sprintf("%s://%s/", uri.Scheme, uri.Host), nil

 }
 
 // ValidateIndexName validates an index name.
 func ValidateIndexName(val string) (string, error) {

 	if val == reference.LegacyDefaultHostname {
 		val = reference.DefaultHostname

 	}

 	if strings.HasPrefix(val, "-") || strings.HasSuffix(val, "-") {
 		return "", fmt.Errorf("Invalid index name (%s). Cannot begin or end with a hyphen.", val)
 	}

 	return val, nil
 }
 
 func validateNoSchema(reposName string) error {
 	if strings.Contains(reposName, "://") {
 		// It cannot contain a scheme!
 		return ErrInvalidRepositoryName
 	}
 	return nil
 }
 

 // newIndexInfo returns IndexInfo configuration from indexName
 func newIndexInfo(config *registrytypes.ServiceConfig, indexName string) (*registrytypes.IndexInfo, error) {

 	var err error
 	indexName, err = ValidateIndexName(indexName)
 	if err != nil {
 		return nil, err
 	}
 
 	// Return any configured index info, first.
 	if index, ok := config.IndexConfigs[indexName]; ok {
 		return index, nil
 	}
 
 	// Construct a non-configured index info.

 	index := &registrytypes.IndexInfo{

 		Name:     indexName,
 		Mirrors:  make([]string, 0),
 		Official: false,
 	}

 	index.Secure = isSecureIndex(config, indexName)

 	return index, nil
 }
 
 // GetAuthConfigKey special-cases using the full index address of the official
 // index as the AuthConfig key, and uses the (host)name[:port] for private indexes.

 func GetAuthConfigKey(index *registrytypes.IndexInfo) string {

 	if index.Official {

 		return IndexServer

 	}
 	return index.Name
 }
 

 // newRepositoryInfo validates and breaks down a repository name into a RepositoryInfo

 func newRepositoryInfo(config *registrytypes.ServiceConfig, name reference.Named) (*RepositoryInfo, error) {
 	index, err := newIndexInfo(config, name.Hostname())

 	if err != nil {
 		return nil, err
 	}

 	official := !strings.ContainsRune(name.Name(), '/')
 	return &RepositoryInfo{name, index, official}, nil

 }
 
 // ParseRepositoryInfo performs the breakdown of a repository name into a RepositoryInfo, but
 // lacks registry configuration.

 func ParseRepositoryInfo(reposName reference.Named) (*RepositoryInfo, error) {

 	return newRepositoryInfo(emptyServiceConfig, reposName)

 }
 

 // ParseSearchIndexInfo will use repository name to get back an indexInfo.

 func ParseSearchIndexInfo(reposName string) (*registrytypes.IndexInfo, error) {

 	indexName, _ := splitReposSearchTerm(reposName)

 	indexInfo, err := newIndexInfo(emptyServiceConfig, indexName)

 	if err != nil {
 		return nil, err
 	}
 	return indexInfo, nil

 }