github.com/jmrodri/operator-sdk@v0.5.0/pkg/scaffold/resource.go (about)

     1  // Copyright 2018 The Operator-SDK Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // Modified from github.com/kubernetes-sigs/controller-tools/pkg/scaffold/resource/resource.go
    16  
    17  package scaffold
    18  
    19  import (
    20  	"errors"
    21  	"fmt"
    22  	"regexp"
    23  	"strings"
    24  
    25  	"github.com/markbates/inflect"
    26  
    27  	"k8s.io/apimachinery/pkg/util/validation"
    28  )
    29  
    30  var (
    31  	// ResourceVersionRegexp matches Kubernetes API versions.
    32  	// See https://kubernetes.io/docs/concepts/overview/kubernetes-api/#api-versioning
    33  	ResourceVersionRegexp = regexp.MustCompile("^v[1-9][0-9]*((alpha|beta)[1-9][0-9]*)?$")
    34  	// ResourceKindRegexp matches Kubernetes API Kind's.
    35  	ResourceKindRegexp = regexp.MustCompile("^[A-Z]{1}[a-zA-Z0-9]+$")
    36  )
    37  
    38  // Resource contains the information required to scaffold files for a resource.
    39  type Resource struct {
    40  	// APIVersion is the complete group-subdomain/version e.g app.example.com/v1alpha1
    41  	APIVersion string
    42  
    43  	// Kind is the API Kind e.g AppService
    44  	Kind string
    45  
    46  	// FullGroup is the complete group name with subdomain e.g app.example.com
    47  	// Parsed from APIVersion
    48  	FullGroup string
    49  
    50  	// Group is the API Group.  Does not contain the sub-domain. e.g app
    51  	// Parsed from APIVersion
    52  	Group string
    53  
    54  	// Version is the API version - e.g. v1alpha1
    55  	// Parsed from APIVersion
    56  	Version string
    57  
    58  	// Resource is the API Resource i.e plural(lowercased(Kind)) e.g appservices
    59  	Resource string
    60  
    61  	// LowerKind is lowercased(Kind) e.g appservice
    62  	LowerKind string
    63  
    64  	// TODO: allow user to specify list of short names for Resource e.g app, myapp
    65  }
    66  
    67  func NewResource(apiVersion, kind string) (*Resource, error) {
    68  	r := &Resource{
    69  		APIVersion: apiVersion,
    70  		Kind:       kind,
    71  	}
    72  	if err := r.Validate(); err != nil {
    73  		return nil, err
    74  	}
    75  	return r, nil
    76  }
    77  
    78  // Validate defaults and checks the Resource values to make sure they are valid.
    79  func (r *Resource) Validate() error {
    80  	if len(r.APIVersion) == 0 {
    81  		return errors.New("api-version cannot be empty")
    82  	}
    83  
    84  	if err := r.checkAndSetKinds(); err != nil {
    85  		return err
    86  	}
    87  	if err := r.checkAndSetGroups(); err != nil {
    88  		return err
    89  	}
    90  	if err := r.checkAndSetVersion(); err != nil {
    91  		return err
    92  	}
    93  
    94  	rs := inflect.NewDefaultRuleset()
    95  	if len(r.Resource) == 0 {
    96  		r.Resource = rs.Pluralize(strings.ToLower(r.Kind))
    97  	}
    98  
    99  	return nil
   100  }
   101  
   102  func (r *Resource) checkAndSetKinds() error {
   103  	if len(r.Kind) == 0 {
   104  		return errors.New("kind cannot be empty")
   105  	}
   106  
   107  	r.LowerKind = strings.ToLower(r.Kind)
   108  
   109  	if strings.Title(r.Kind) != r.Kind {
   110  		return fmt.Errorf("kind must begin with uppercase (was %v)", r.Kind)
   111  	}
   112  	if !ResourceKindRegexp.MatchString(r.Kind) {
   113  		return errors.New("kind should consist of lower and uppercase alphabetical characters")
   114  	}
   115  	return nil
   116  }
   117  
   118  func (r *Resource) checkAndSetGroups() error {
   119  	fg := strings.Split(r.APIVersion, "/")
   120  	if len(fg) < 2 || len(fg[0]) == 0 {
   121  		return errors.New("full group cannot be empty")
   122  	}
   123  	g := strings.Split(fg[0], ".")
   124  	if len(g) < 2 || len(g[0]) == 0 {
   125  		return errors.New("group cannot be empty")
   126  	}
   127  	r.FullGroup = fg[0]
   128  	r.Group = g[0]
   129  
   130  	if err := validation.IsDNS1123Subdomain(r.Group); err != nil {
   131  		return fmt.Errorf("group name is invalid: %v", err)
   132  	}
   133  	return nil
   134  }
   135  
   136  func (r *Resource) checkAndSetVersion() error {
   137  	api := strings.Split(r.APIVersion, "/")
   138  	if len(api) < 2 || len(api[1]) == 0 {
   139  		return errors.New("version cannot be empty")
   140  	}
   141  	r.Version = api[1]
   142  
   143  	if !ResourceVersionRegexp.MatchString(r.Version) {
   144  		return errors.New("version is not in the correct Kubernetes version format, ex. v1alpha1")
   145  	}
   146  	return nil
   147  }