k8s.io/client-go@v0.31.1/rest/url_utils.go (about)

     1  /*
     2  Copyright 2016 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package rest
    18  
    19  import (
    20  	"fmt"
    21  	"net/url"
    22  	"path"
    23  
    24  	"k8s.io/apimachinery/pkg/runtime/schema"
    25  )
    26  
    27  // DefaultServerURL converts a host, host:port, or URL string to the default base server API path
    28  // to use with a Client at a given API version following the standard conventions for a
    29  // Kubernetes API.
    30  func DefaultServerURL(host, apiPath string, groupVersion schema.GroupVersion, defaultTLS bool) (*url.URL, string, error) {
    31  	if host == "" {
    32  		return nil, "", fmt.Errorf("host must be a URL or a host:port pair")
    33  	}
    34  	base := host
    35  	hostURL, err := url.Parse(base)
    36  	if err != nil || hostURL.Scheme == "" || hostURL.Host == "" {
    37  		scheme := "http://"
    38  		if defaultTLS {
    39  			scheme = "https://"
    40  		}
    41  		hostURL, err = url.Parse(scheme + base)
    42  		if err != nil {
    43  			return nil, "", err
    44  		}
    45  		if hostURL.Path != "" && hostURL.Path != "/" {
    46  			return nil, "", fmt.Errorf("host must be a URL or a host:port pair: %q", base)
    47  		}
    48  	}
    49  
    50  	// hostURL.Path is optional; a non-empty Path is treated as a prefix that is to be applied to
    51  	// all URIs used to access the host. this is useful when there's a proxy in front of the
    52  	// apiserver that has relocated the apiserver endpoints, forwarding all requests from, for
    53  	// example, /a/b/c to the apiserver. in this case the Path should be /a/b/c.
    54  	//
    55  	// if running without a frontend proxy (that changes the location of the apiserver), then
    56  	// hostURL.Path should be blank.
    57  	//
    58  	// versionedAPIPath, a path relative to baseURL.Path, points to a versioned API base
    59  	versionedAPIPath := DefaultVersionedAPIPath(apiPath, groupVersion)
    60  
    61  	return hostURL, versionedAPIPath, nil
    62  }
    63  
    64  // DefaultVersionedAPIPathFor constructs the default path for the given group version, assuming the given
    65  // API path, following the standard conventions of the Kubernetes API.
    66  func DefaultVersionedAPIPath(apiPath string, groupVersion schema.GroupVersion) string {
    67  	versionedAPIPath := path.Join("/", apiPath)
    68  
    69  	// Add the version to the end of the path
    70  	if len(groupVersion.Group) > 0 {
    71  		versionedAPIPath = path.Join(versionedAPIPath, groupVersion.Group, groupVersion.Version)
    72  
    73  	} else {
    74  		versionedAPIPath = path.Join(versionedAPIPath, groupVersion.Version)
    75  	}
    76  
    77  	return versionedAPIPath
    78  }
    79  
    80  // DefaultServerUrlFor is shared between IsConfigTransportTLS and RESTClientFor. It
    81  // requires Host and Version to be set prior to being called.
    82  func DefaultServerUrlFor(config *Config) (*url.URL, string, error) {
    83  	// TODO: move the default to secure when the apiserver supports TLS by default
    84  	// config.Insecure is taken to mean "I want HTTPS but don't bother checking the certs against a CA."
    85  	hasCA := len(config.CAFile) != 0 || len(config.CAData) != 0
    86  	hasCert := len(config.CertFile) != 0 || len(config.CertData) != 0
    87  	defaultTLS := hasCA || hasCert || config.Insecure
    88  	host := config.Host
    89  	if host == "" {
    90  		host = "localhost"
    91  	}
    92  
    93  	if config.GroupVersion != nil {
    94  		return DefaultServerURL(host, config.APIPath, *config.GroupVersion, defaultTLS)
    95  	}
    96  	return DefaultServerURL(host, config.APIPath, schema.GroupVersion{}, defaultTLS)
    97  }