mirror of
https://github.com/gofiber/fiber.git
synced 2025-09-04 19:35:47 +00:00
94 lines
2.8 KiB
Go
94 lines
2.8 KiB
Go
package cors
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import (
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"net/url"
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"strings"
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)
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// matchScheme compares the scheme of the domain and pattern
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func matchScheme(domain, pattern string) bool {
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didx := strings.Index(domain, ":")
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pidx := strings.Index(pattern, ":")
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return didx != -1 && pidx != -1 && domain[:didx] == pattern[:pidx]
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}
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// normalizeDomain removes the scheme and port from the input domain
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func normalizeDomain(input string) string {
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// Remove scheme
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input = strings.TrimPrefix(strings.TrimPrefix(input, "http://"), "https://")
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// Find and remove port, if present
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if len(input) > 0 && input[0] != '[' {
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if portIndex := strings.Index(input, ":"); portIndex != -1 {
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input = input[:portIndex]
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}
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}
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return input
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}
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// normalizeOrigin checks if the provided origin is in a correct format
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// and normalizes it by removing any path or trailing slash.
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// It returns a boolean indicating whether the origin is valid
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// and the normalized origin.
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func normalizeOrigin(origin string) (bool, string) {
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parsedOrigin, err := url.Parse(origin)
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if err != nil {
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return false, ""
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}
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// Don't allow a wildcard with a protocol
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// wildcards cannot be used within any other value. For example, the following header is not valid:
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// Access-Control-Allow-Origin: https://*
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if strings.Contains(parsedOrigin.Host, "*") {
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return false, ""
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}
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// Validate there is a host present. The presence of a path, query, or fragment components
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// is checked, but a trailing "/" (indicative of the root) is allowed for the path and will be normalized
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if parsedOrigin.Host == "" || (parsedOrigin.Path != "" && parsedOrigin.Path != "/") || parsedOrigin.RawQuery != "" || parsedOrigin.Fragment != "" {
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return false, ""
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}
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// Normalize the origin by constructing it from the scheme and host.
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// The path or trailing slash is not included in the normalized origin.
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return true, strings.ToLower(parsedOrigin.Scheme + "://" + parsedOrigin.Host)
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}
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type subdomain struct {
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// The wildcard pattern
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prefix string
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suffix string
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}
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func (s subdomain) match(o string) bool {
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// Not a subdomain if not long enough for a dot separator.
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if len(o) < len(s.prefix)+len(s.suffix)+1 {
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return false
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}
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if !strings.HasPrefix(o, s.prefix) || !strings.HasSuffix(o, s.suffix) {
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return false
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}
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// Check for the dot separator and validate that there is at least one
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// non-empty label between prefix and suffix. Empty labels like
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// "https://.example.com" or "https://..example.com" should not match.
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suffixStartIndex := len(o) - len(s.suffix)
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if suffixStartIndex <= len(s.prefix) {
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return false
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}
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if o[suffixStartIndex-1] != '.' {
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return false
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}
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// Extract the subdomain part (without the trailing dot) and ensure it
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// doesn't contain empty labels.
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sub := o[len(s.prefix) : suffixStartIndex-1]
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if sub == "" || strings.HasPrefix(sub, ".") || strings.Contains(sub, "..") {
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return false
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}
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return true
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}
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