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package validate |
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import ( |
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"errors" |
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"net" |
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"net/url" |
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"regexp" |
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"strings" |
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) |
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var ( |
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ErrRestrictedSchema = errors.New("restricted schema") |
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ErrRestrictedHost = errors.New("restricted host") |
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) |
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// URL is used to validate that value is a valid URL string. You can use a list of restrictions |
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// to additionally check for a restricted set of URLs. By default, if no restrictions are passed, |
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// the function checks for the http:// and https:// schemas. |
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// |
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// Use the RestrictURLSchemas option to configure the list of expected schemas. If an empty string is passed |
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// as a schema, then URL value may be treated as relative (without schema, e.g. "//example.com"). |
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// |
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// Use the RestrictURLHosts or RestrictURLHostByPattern option to configure the list of allowed hosts. |
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// |
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// If value is not a valid URL the function will return one of the errors: |
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// • parsing error from url.Parse method if value cannot be parsed as a URL; |
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// • ErrRestrictedSchema if schema is not matching one of the listed schemas; |
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// • ErrRestrictedHost if host is not matching one of the listed hosts; |
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// • ErrInvalid if value is not matching the regular expression. |
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func URL(value string, restrictions ...URLRestriction) error { |
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if len(restrictions) == 0 { |
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restrictions = append(restrictions, RestrictURLSchemas("http", "https")) |
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} |
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u, err := url.Parse(value) |
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if err != nil { |
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return err |
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} |
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for _, check := range restrictions { |
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if err = check(u); err != nil { |
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return err |
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} |
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} |
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if !urlRegex.MatchString(value) { |
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return ErrInvalid |
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} |
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return nil |
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} |
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// URLRestriction can be used to limit valid URL values. |
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type URLRestriction func(u *url.URL) error |
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// RestrictURLSchemas make URL validation accepts only the listed schemas. |
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func RestrictURLSchemas(schemas ...string) URLRestriction { |
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return func(u *url.URL) error { |
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for _, schema := range schemas { |
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if schema == u.Scheme { |
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return nil |
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} |
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} |
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return ErrRestrictedSchema |
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} |
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} |
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// RestrictURLHosts make URL validation accepts only the listed hosts. |
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func RestrictURLHosts(hosts ...string) URLRestriction { |
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return func(u *url.URL) error { |
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for _, host := range hosts { |
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if host == u.Host { |
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return nil |
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} |
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} |
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return ErrRestrictedHost |
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} |
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} |
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// RestrictURLHostByPattern make URL validation accepts only a value with a host matching by pattern. |
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func RestrictURLHostByPattern(pattern *regexp.Regexp) URLRestriction { |
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return func(u *url.URL) error { |
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if pattern.MatchString(u.Host) { |
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return nil |
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} |
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return ErrRestrictedHost |
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} |
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} |
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// IP validates that a value is a valid IP address (IPv4 or IPv6). You can use a list |
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// of restrictions to additionally check for a restricted range of IPs. For example, |
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// you can deny using private IP addresses using DenyPrivateIP function. |
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// |
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// If value is not valid the function will return one of the errors: |
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// • ErrInvalid on invalid IP address; |
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// • ErrProhibited on restricted IP address. |
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func IP(value string, restrictions ...IPRestriction) error { |
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return validateIP(value, restrictions...) |
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} |
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// IPv4 validates that a value is a valid IPv4 address. You can use a list |
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// of restrictions to additionally check for a restricted range of IPs. For example, |
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// you can deny using private IP addresses using DenyPrivateIP function. |
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// |
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// If value is not valid the function will return one of the errors: |
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// • ErrInvalid on invalid IP address or when using IPv6; |
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// • ErrProhibited on restricted IP address. |
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func IPv4(value string, restrictions ...IPRestriction) error { |
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err := validateIP(value, restrictions...) |
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if err != nil { |
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return err |
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} |
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if !strings.Contains(value, ".") || strings.Contains(value, ":") { |
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return ErrInvalid |
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} |
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return nil |
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} |
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// IPv6 validates that a value is a valid IPv6 address. You can use a list |
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// of restrictions to additionally check for a restricted range of IPs. For example, |
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// you can deny using private IP addresses using DenyPrivateIP function. |
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// |
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// If value is not valid the function will return one of the errors: |
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// • ErrInvalid on invalid IP address or when using IPv4; |
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// • ErrProhibited on restricted IP address. |
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func IPv6(value string, restrictions ...IPRestriction) error { |
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err := validateIP(value, restrictions...) |
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if err != nil { |
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return err |
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} |
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if !strings.Contains(value, ":") { |
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return ErrInvalid |
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} |
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return nil |
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} |
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// IPRestriction can be used to limit valid IP address values. |
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type IPRestriction func(ip net.IP) bool |
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// DenyPrivateIP denies using of private IPs according to RFC 1918 (IPv4 addresses) |
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// and RFC 4193 (IPv6 addresses). |
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func DenyPrivateIP() IPRestriction { |
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return func(ip net.IP) bool { |
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return ip.IsPrivate() |
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} |
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} |
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func validateIP(value string, restrictions ...IPRestriction) error { |
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ip := net.ParseIP(value) |
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if ip == nil { |
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return ErrInvalid |
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} |
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for _, isProhibited := range restrictions { |
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if isProhibited(ip) { |
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return ErrProhibited |
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} |
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} |
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return nil |
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} |
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const ( |
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urlSchema = `([a-z]*:)?//` |
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urlBasicAuth = `(((?:[\_\.\pL\pN-]|%[0-9A-Fa-f]{2})+:)?((?:[\_\.\pL\pN-]|%[0-9A-Fa-f]{2})+)@)?` |
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urlDomainName = `([\pL\pN\pS\-\_\.])+(\.?([\pL\pN]|xn\-\-[\pL\pN-]+)+\.?)` |
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ipv4 = `\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}` |
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ipv6 = `\[(?:(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){6})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:::(?:(?:(?:[0-9a-f]{1,4})):){5})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){4})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,1}(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){3})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,2}(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){2})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,3}(?:(?:[0-9a-f]{1,4})))?::(?:(?:[0-9a-f]{1,4})):)(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,4}(?:(?:[0-9a-f]{1,4})))?::)(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,5}(?:(?:[0-9a-f]{1,4})))?::)(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,6}(?:(?:[0-9a-f]{1,4})))?::))))\]` |
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urlHost = `(` + urlDomainName + `|` + ipv4 + `|` + ipv6 + `)` |
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urlPort = `(:[0-9]+)?` |
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urlPath = `(?:/(?:[\pL\pN\-._\~!$&\'()*+,;=:@]|%[0-9A-Fa-f]{2})*)*` |
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urlQuery = `(?:\?(?:[\pL\pN\-._\~!$&\'\[\]()*+,;=:@/?]|%[0-9A-Fa-f]{2})*)?` |
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urlFragment = `(?:\#(?:[\pL\pN\-._\~!$&\'()*+,;=:@/?]|%[0-9A-Fa-f]{2})*)?` |
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urlPattern = `(?i)^` + urlSchema + urlBasicAuth + urlHost + urlPort + urlPath + urlQuery + urlFragment + `$` |
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) |
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var urlRegex = regexp.MustCompile(urlPattern) |
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muonsoft /
validation
