github.com/greenpau/go-authcrunch@v1.1.4/pkg/redirects/redirect_parser.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  	"net/url"
    20  	"strings"
    21  )
    22  
    23  // ParseRedirectURI parses redirect_uri from URL string.
    24  func ParseRedirectURI(s string) (*url.URL, error) {
    25  	parsedURL, err := url.Parse(s)
    26  	if err != nil {
    27  		return nil, fmt.Errorf("failed to parse base uri")
    28  	}
    29  	if parsedURL.Scheme == "" || parsedURL.Host == "" || parsedURL.Path == "" {
    30  		return nil, fmt.Errorf("non compliant base uri")
    31  	}
    32  	if !HasRedirectURI(parsedURL) {
    33  		return nil, fmt.Errorf("redirect uri is not url")
    34  	}
    35  	queryParams := parsedURL.Query()
    36  	rawRedirectURI := queryParams.Get("redirect_uri")
    37  	if strings.HasPrefix(rawRedirectURI, "/") {
    38  		return nil, fmt.Errorf("redirect uri has no scheme and host")
    39  	}
    40  	parsedRedirectURI, err := url.Parse(rawRedirectURI)
    41  	if err != nil {
    42  		return nil, fmt.Errorf("failed to parse redirect uri")
    43  	}
    44  	if parsedRedirectURI.Scheme == "" || parsedRedirectURI.Host == "" || parsedRedirectURI.Path == "" {
    45  		return nil, fmt.Errorf("non compliant redirect uri")
    46  	}
    47  	return parsedRedirectURI, nil
    48  }
    49  
    50  // GetRedirectURI returns redirect_uri value from query parameters.
    51  func GetRedirectURI(u *url.URL) *url.URL {
    52  	queryParams := u.Query()
    53  	if queryParams == nil {
    54  		return nil
    55  	}
    56  	rawRedirectURI := queryParams.Get("redirect_uri")
    57  	parsedRedirectURI, err := url.Parse(rawRedirectURI)
    58  	if err != nil {
    59  		return nil
    60  	}
    61  	if parsedRedirectURI.Scheme == "" || parsedRedirectURI.Host == "" || parsedRedirectURI.Path == "" {
    62  		return nil
    63  	}
    64  	return parsedRedirectURI
    65  }
    66  
    67  // GetRawRedirectURI returns raw redirect_uri value from query parameters.
    68  func GetRawRedirectURI(u *url.URL) string {
    69  	queryParams := u.Query()
    70  	if queryParams == nil {
    71  		return ""
    72  	}
    73  	return queryParams.Get("redirect_uri")
    74  }
    75  
    76  // HasRedirectURI check whether URL has redirect_uri in query parameters.
    77  func HasRedirectURI(u *url.URL) bool {
    78  	queryParams := u.Query()
    79  	if queryParams == nil {
    80  		return false
    81  	}
    82  	rawRedirectURI := queryParams.Get("redirect_uri")
    83  	if rawRedirectURI == "" {
    84  		return false
    85  	}
    86  	return true
    87  }