github.com/greenpau/go-authcrunch@v1.1.4/pkg/redirects/redirect.go (about)

     1  // Copyright 2024 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 redirects
    16  
    17  import (
    18  	"fmt"
    19  	"regexp"
    20  	"strings"
    21  )
    22  
    23  type matchStrategy int
    24  
    25  const (
    26  	matchUnknown matchStrategy = 0
    27  	matchExact   matchStrategy = 1
    28  	matchPartial matchStrategy = 2
    29  	matchPrefix  matchStrategy = 3
    30  	matchSuffix  matchStrategy = 4
    31  	matchRegex   matchStrategy = 5
    32  )
    33  
    34  // RedirectURIMatchConfig holds the configuration for a redirect URI.
    35  type RedirectURIMatchConfig struct {
    36  	PathMatchType   string `json:"path_match_type,omitempty" xml:"path_match_type,omitempty" yaml:"path_match_type,omitempty"`
    37  	Path            string `json:"path,omitempty" xml:"path,omitempty" yaml:"path,omitempty"`
    38  	DomainMatchType string `json:"domain_match_type,omitempty" xml:"domain_match_type,omitempty" yaml:"domain_match_type,omitempty"`
    39  	Domain          string `json:"domain,omitempty" xml:"domain,omitempty" yaml:"domain,omitempty"`
    40  
    41  	pathMatch   matchStrategy
    42  	pathRegex   *regexp.Regexp
    43  	domainMatch matchStrategy
    44  	domainRegex *regexp.Regexp
    45  }
    46  
    47  // NewRedirectURIMatchConfig return an instance of *RedirectURIMatchConfig.
    48  func NewRedirectURIMatchConfig(domainMatchType, domain, pathMatchType, path string) (*RedirectURIMatchConfig, error) {
    49  	c := &RedirectURIMatchConfig{
    50  		PathMatchType:   strings.TrimSpace(pathMatchType),
    51  		Path:            strings.TrimSpace(path),
    52  		DomainMatchType: strings.TrimSpace(domainMatchType),
    53  		Domain:          strings.TrimSpace(domain),
    54  	}
    55  	if err := c.Validate(); err != nil {
    56  		return nil, err
    57  	}
    58  	return c, nil
    59  }
    60  
    61  // Validate validates RedirectURIMatchConfig.
    62  func (c *RedirectURIMatchConfig) Validate() error {
    63  	switch c.PathMatchType {
    64  	case "exact":
    65  		c.pathMatch = matchExact
    66  	case "partial":
    67  		c.pathMatch = matchPartial
    68  	case "prefix":
    69  		c.pathMatch = matchPrefix
    70  	case "suffix":
    71  		c.pathMatch = matchSuffix
    72  	case "regex":
    73  		c.pathMatch = matchRegex
    74  	case "":
    75  		return fmt.Errorf("undefined redirect uri path match type")
    76  	default:
    77  		return fmt.Errorf("invalid %q redirect uri path match type", c.PathMatchType)
    78  	}
    79  
    80  	switch c.DomainMatchType {
    81  	case "exact":
    82  		c.domainMatch = matchExact
    83  	case "partial":
    84  		c.domainMatch = matchPartial
    85  	case "prefix":
    86  		c.domainMatch = matchPrefix
    87  	case "suffix":
    88  		c.domainMatch = matchSuffix
    89  	case "regex":
    90  		c.domainMatch = matchRegex
    91  	case "":
    92  		return fmt.Errorf("undefined redirect uri domain name match type")
    93  	default:
    94  		return fmt.Errorf("invalid %q redirect uri domain name match type", c.DomainMatchType)
    95  	}
    96  
    97  	c.Path = strings.TrimSpace(c.Path)
    98  	c.Domain = strings.TrimSpace(c.Domain)
    99  
   100  	if c.Path == "" {
   101  		return fmt.Errorf("undefined redirect uri path")
   102  	}
   103  
   104  	if c.Domain == "" {
   105  		return fmt.Errorf("undefined redirect uri domain")
   106  	}
   107  
   108  	if c.pathRegex == nil {
   109  		r, err := regexp.Compile(c.Path)
   110  		if err != nil {
   111  			return err
   112  		}
   113  		c.pathRegex = r
   114  	}
   115  
   116  	if c.domainRegex == nil {
   117  		r, err := regexp.Compile(c.Domain)
   118  		if err != nil {
   119  			return err
   120  		}
   121  		c.domainRegex = r
   122  	}
   123  
   124  	return nil
   125  }