Split implementations from generic code

core/pkg/ingress/annotations/auth/main.go

@@ -0,0 +1,122 @@
+/*
+Copyright 2015 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package auth
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"regexp"
+
+	"k8s.io/ingress/core/pkg/ingress/annotations/parser"
+
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/apis/extensions"
+)
+
+const (
+	authType   = "ingress.kubernetes.io/auth-type"
+	authSecret = "ingress.kubernetes.io/auth-secret"
+	authRealm  = "ingress.kubernetes.io/auth-realm"
+
+	// DefAuthDirectory default directory used to store files
+	// to authenticate request
+	DefAuthDirectory = "/etc/ingress-controller/auth"
+)
+
+func init() {
+	// TODO: check permissions required
+	os.MkdirAll(DefAuthDirectory, 0655)
+}
+
+var (
+	authTypeRegex = regexp.MustCompile(`basic|digest`)
+
+	// ErrInvalidAuthType is return in case of unsupported authentication type
+	ErrInvalidAuthType = errors.New("invalid authentication type")
+
+	// ErrMissingSecretName is returned when the name of the secret is missing
+	ErrMissingSecretName = errors.New("secret name is missing")
+
+	// ErrMissingAuthInSecret is returned when there is no auth key in secret data
+	ErrMissingAuthInSecret = errors.New("the secret does not contains the auth key")
+)
+
+// BasicDigest returns authentication configuration for an Ingress rule
+type BasicDigest struct {
+	Type    string
+	Realm   string
+	File    string
+	Secured bool
+}
+
+// ParseAnnotations parses the annotations contained in the ingress
+// rule used to add authentication in the paths defined in the rule
+// and generated an htpasswd compatible file to be used as source
+// during the authentication process
+func ParseAnnotations(ing *extensions.Ingress, authDir string, fn func(string) (*api.Secret, error)) (*BasicDigest, error) {
+	if ing.GetAnnotations() == nil {
+		return &BasicDigest{}, parser.ErrMissingAnnotations
+	}
+
+	at, err := parser.GetStringAnnotation(authType, ing)
+	if err != nil {
+		return &BasicDigest{}, err
+	}
+
+	if !authTypeRegex.MatchString(at) {
+		return &BasicDigest{}, ErrInvalidAuthType
+	}
+
+	s, err := parser.GetStringAnnotation(authSecret, ing)
+	if err != nil {
+		return &BasicDigest{}, err
+	}
+
+	secret, err := fn(fmt.Sprintf("%v/%v", ing.Namespace, s))
+	if err != nil {
+		return &BasicDigest{}, err
+	}
+
+	realm, _ := parser.GetStringAnnotation(authRealm, ing)
+
+	passFile := fmt.Sprintf("%v/%v-%v.passwd", authDir, ing.GetNamespace(), ing.GetName())
+	err = dumpSecret(passFile, secret)
+	if err != nil {
+		return &BasicDigest{}, err
+	}
+
+	return &BasicDigest{
+		Type:    at,
+		Realm:   realm,
+		File:    passFile,
+		Secured: true,
+	}, nil
+}
+
+// dumpSecret dumps the content of a secret into a file
+// in the expected format for the specified authorization
+func dumpSecret(filename string, secret *api.Secret) error {
+	val, ok := secret.Data["auth"]
+	if !ok {
+		return ErrMissingAuthInSecret
+	}
+
+	// TODO: check permissions required
+	return ioutil.WriteFile(filename, val, 0777)
+}