github.com/greenpau/go-authcrunch@v1.1.4/pkg/sso/request.go (about)

     1  // Copyright 2022 Paul Greenberg greenpau@outlook.com
     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  package sso
    16  
    17  import (
    18  	"net/http"
    19  	"strings"
    20  
    21  	"github.com/greenpau/go-authcrunch/pkg/errors"
    22  )
    23  
    24  // RequestKind represents the type of SSO provider request.
    25  type RequestKind int
    26  
    27  const (
    28  	ssoPrefix       = "/apps/sso/"
    29  	metadataKeyword = "/metadata.xml"
    30  	ssumeKeyword    = "/assume"
    31  
    32  	// UnknownRequest represents unspecified request type.
    33  	UnknownRequest RequestKind = iota
    34  	// MetadataRequest represents metadata request type.
    35  	MetadataRequest
    36  	// AssumeRoleRequest represents role assumption request type.
    37  	AssumeRoleRequest
    38  	// MenuRequest represents role selection request type.
    39  	MenuRequest
    40  )
    41  
    42  // Request represents sso provider request.
    43  type Request struct {
    44  	ProviderName string      `json:"provider_name,omitempty" xml:"provider_name,omitempty" yaml:"provider_name,omitempty"`
    45  	Kind         RequestKind `json:"kind,omitempty" xml:"kind,omitempty" yaml:"kind,omitempty"`
    46  	Params       string      `json:"params,omitempty" xml:"params,omitempty" yaml:"params,omitempty"`
    47  }
    48  
    49  // ParseRequestURL extracts provider name and request type from URL.
    50  func ParseRequestURL(r *http.Request) (*Request, error) {
    51  	req := &Request{}
    52  
    53  	s := r.URL.Path
    54  	i := strings.Index(s, ssoPrefix)
    55  	if i < 0 {
    56  		return nil, errors.ErrSingleSignOnProviderRequestMalformed
    57  	}
    58  	s = strings.TrimPrefix(s[i:], ssoPrefix)
    59  
    60  	parts := strings.SplitN(s, "/", 2)
    61  	req.ProviderName = parts[0]
    62  
    63  	if len(parts) == 1 {
    64  		if parts[0] == "" {
    65  			return nil, errors.ErrSingleSignOnProviderRequestMalformed
    66  		}
    67  		req.Kind = MenuRequest
    68  		return req, nil
    69  	}
    70  
    71  	if strings.HasPrefix(parts[1], "assume/") {
    72  		params := strings.TrimPrefix(parts[1], "assume/")
    73  		if params == "" {
    74  			return nil, errors.ErrSingleSignOnProviderRequestMalformed
    75  		}
    76  		req.Params = params
    77  		req.Kind = AssumeRoleRequest
    78  		return req, nil
    79  	}
    80  
    81  	if parts[1] == "metadata.xml" {
    82  		req.Kind = MetadataRequest
    83  		return req, nil
    84  	}
    85  
    86  	return nil, errors.ErrSingleSignOnProviderRequestMalformed
    87  }