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format_checkers.go
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format_checkers.go
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package gojsonschema
import (
"net"
"net/mail"
"net/url"
"regexp"
"strings"
"sync"
"time"
)
type (
// FormatChecker is the interface all formatters added to FormatCheckerChain must implement
FormatChecker interface {
// IsFormat checks if input has the correct format
IsFormat(input interface{}) bool
}
// FormatCheckerChain holds the formatters
FormatCheckerChain struct {
formatters map[string]FormatChecker
}
// EmailFormatChecker verifies email address formats
EmailFormatChecker struct{}
// IPV4FormatChecker verifies IP addresses in the IPv4 format
IPV4FormatChecker struct{}
// IPV6FormatChecker verifies IP addresses in the IPv6 format
IPV6FormatChecker struct{}
// DateTimeFormatChecker verifies date/time formats per RFC3339 5.6
//
// Valid formats:
// Partial Time: HH:MM:SS
// Full Date: YYYY-MM-DD
// Full Time: HH:MM:SSZ-07:00
// Date Time: YYYY-MM-DDTHH:MM:SSZ-0700
//
// Where
// YYYY = 4DIGIT year
// MM = 2DIGIT month ; 01-12
// DD = 2DIGIT day-month ; 01-28, 01-29, 01-30, 01-31 based on month/year
// HH = 2DIGIT hour ; 00-23
// MM = 2DIGIT ; 00-59
// SS = 2DIGIT ; 00-58, 00-60 based on leap second rules
// T = Literal
// Z = Literal
//
// Note: Nanoseconds are also suported in all formats
//
// http://tools.ietf.org/html/rfc3339#section-5.6
DateTimeFormatChecker struct{}
// DateFormatChecker verifies date formats
//
// Valid format:
// Full Date: YYYY-MM-DD
//
// Where
// YYYY = 4DIGIT year
// MM = 2DIGIT month ; 01-12
// DD = 2DIGIT day-month ; 01-28, 01-29, 01-30, 01-31 based on month/year
DateFormatChecker struct{}
// TimeFormatChecker verifies time formats
//
// Valid formats:
// Partial Time: HH:MM:SS
// Full Time: HH:MM:SSZ-07:00
//
// Where
// HH = 2DIGIT hour ; 00-23
// MM = 2DIGIT ; 00-59
// SS = 2DIGIT ; 00-58, 00-60 based on leap second rules
// T = Literal
// Z = Literal
TimeFormatChecker struct{}
// URIFormatChecker validates a URI with a valid Scheme per RFC3986
URIFormatChecker struct{}
// URIReferenceFormatChecker validates a URI or relative-reference per RFC3986
URIReferenceFormatChecker struct{}
// URITemplateFormatChecker validates a URI template per RFC6570
URITemplateFormatChecker struct{}
// HostnameFormatChecker validates a hostname is in the correct format
HostnameFormatChecker struct{}
// UUIDFormatChecker validates a UUID is in the correct format
UUIDFormatChecker struct{}
// RegexFormatChecker validates a regex is in the correct format
RegexFormatChecker struct{}
// JSONPointerFormatChecker validates a JSON Pointer per RFC6901
JSONPointerFormatChecker struct{}
// RelativeJSONPointerFormatChecker validates a relative JSON Pointer is in the correct format
RelativeJSONPointerFormatChecker struct{}
)
var (
// FormatCheckers holds the valid formatters, and is a public variable
// so library users can add custom formatters
FormatCheckers = FormatCheckerChain{
formatters: map[string]FormatChecker{
"date": DateFormatChecker{},
"time": TimeFormatChecker{},
"date-time": DateTimeFormatChecker{},
"hostname": HostnameFormatChecker{},
"email": EmailFormatChecker{},
"idn-email": EmailFormatChecker{},
"ipv4": IPV4FormatChecker{},
"ipv6": IPV6FormatChecker{},
"uri": URIFormatChecker{},
"uri-reference": URIReferenceFormatChecker{},
"iri": URIFormatChecker{},
"iri-reference": URIReferenceFormatChecker{},
"uri-template": URITemplateFormatChecker{},
"uuid": UUIDFormatChecker{},
"regex": RegexFormatChecker{},
"json-pointer": JSONPointerFormatChecker{},
"relative-json-pointer": RelativeJSONPointerFormatChecker{},
},
}
// Regex credit: https://www.socketloop.com/tutorials/golang-validate-hostname
rxHostname = regexp.MustCompile(`^([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])(\.([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]{0,61}[a-zA-Z0-9]))*$`)
// Use a regex to make sure curly brackets are balanced properly after validating it as a AURI
rxURITemplate = regexp.MustCompile("^([^{]*({[^}]*})?)*$")
rxUUID = regexp.MustCompile("^(?i)[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$")
rxJSONPointer = regexp.MustCompile("^(?:/(?:[^~/]|~0|~1)*)*$")
rxRelJSONPointer = regexp.MustCompile("^(?:0|[1-9][0-9]*)(?:#|(?:/(?:[^~/]|~0|~1)*)*)$")
lock = new(sync.RWMutex)
)
// Add adds a FormatChecker to the FormatCheckerChain
// The name used will be the value used for the format key in your json schema
func (c *FormatCheckerChain) Add(name string, f FormatChecker) *FormatCheckerChain {
lock.Lock()
c.formatters[name] = f
lock.Unlock()
return c
}
// Remove deletes a FormatChecker from the FormatCheckerChain (if it exists)
func (c *FormatCheckerChain) Remove(name string) *FormatCheckerChain {
lock.Lock()
delete(c.formatters, name)
lock.Unlock()
return c
}
// Has checks to see if the FormatCheckerChain holds a FormatChecker with the given name
func (c *FormatCheckerChain) Has(name string) bool {
lock.RLock()
_, ok := c.formatters[name]
lock.RUnlock()
return ok
}
// IsFormat will check an input against a FormatChecker with the given name
// to see if it is the correct format
func (c *FormatCheckerChain) IsFormat(name string, input interface{}) bool {
lock.RLock()
f, ok := c.formatters[name]
lock.RUnlock()
// If a format is unrecognized it should always pass validation
if !ok {
return true
}
return f.IsFormat(input)
}
// IsFormat checks if input is a correctly formatted e-mail address
func (f EmailFormatChecker) IsFormat(input interface{}) bool {
asString, ok := input.(string)
if !ok {
return true
}
_, err := mail.ParseAddress(asString)
return err == nil
}
// IsFormat checks if input is a correctly formatted IPv4-address
func (f IPV4FormatChecker) IsFormat(input interface{}) bool {
asString, ok := input.(string)
if !ok {
return true
}
// Credit: https://github.com/asaskevich/govalidator
ip := net.ParseIP(asString)
return ip != nil && strings.Contains(asString, ".")
}
// IsFormat checks if input is a correctly formatted IPv6=address
func (f IPV6FormatChecker) IsFormat(input interface{}) bool {
asString, ok := input.(string)
if !ok {
return true
}
// Credit: https://github.com/asaskevich/govalidator
ip := net.ParseIP(asString)
return ip != nil && strings.Contains(asString, ":")
}
// IsFormat checks if input is a correctly formatted date/time per RFC3339 5.6
func (f DateTimeFormatChecker) IsFormat(input interface{}) bool {
asString, ok := input.(string)
if !ok {
return true
}
formats := []string{
"15:04:05",
"15:04:05Z07:00",
"2006-01-02",
time.RFC3339,
time.RFC3339Nano,
}
for _, format := range formats {
if _, err := time.Parse(format, asString); err == nil {
return true
}
}
return false
}
// IsFormat checks if input is a correctly formatted date (YYYY-MM-DD)
func (f DateFormatChecker) IsFormat(input interface{}) bool {
asString, ok := input.(string)
if !ok {
return true
}
_, err := time.Parse("2006-01-02", asString)
return err == nil
}
// IsFormat checks if input correctly formatted time (HH:MM:SS or HH:MM:SSZ-07:00)
func (f TimeFormatChecker) IsFormat(input interface{}) bool {
asString, ok := input.(string)
if !ok {
return true
}
if _, err := time.Parse("15:04:05Z07:00", asString); err == nil {
return true
}
_, err := time.Parse("15:04:05", asString)
return err == nil
}
// IsFormat checks if input is correctly formatted URI with a valid Scheme per RFC3986
func (f URIFormatChecker) IsFormat(input interface{}) bool {
asString, ok := input.(string)
if !ok {
return true
}
u, err := url.Parse(asString)
if err != nil || u.Scheme == "" {
return false
}
return !strings.Contains(asString, `\`)
}
// IsFormat checks if input is a correctly formatted URI or relative-reference per RFC3986
func (f URIReferenceFormatChecker) IsFormat(input interface{}) bool {
asString, ok := input.(string)
if !ok {
return true
}
_, err := url.Parse(asString)
return err == nil && !strings.Contains(asString, `\`)
}
// IsFormat checks if input is a correctly formatted URI template per RFC6570
func (f URITemplateFormatChecker) IsFormat(input interface{}) bool {
asString, ok := input.(string)
if !ok {
return true
}
u, err := url.Parse(asString)
if err != nil || strings.Contains(asString, `\`) {
return false
}
return rxURITemplate.MatchString(u.Path)
}
// IsFormat checks if input is a correctly formatted hostname
func (f HostnameFormatChecker) IsFormat(input interface{}) bool {
asString, ok := input.(string)
if !ok {
return true
}
return rxHostname.MatchString(asString) && len(asString) < 256
}
// IsFormat checks if input is a correctly formatted UUID
func (f UUIDFormatChecker) IsFormat(input interface{}) bool {
asString, ok := input.(string)
if !ok {
return true
}
return rxUUID.MatchString(asString)
}
// IsFormat checks if input is a correctly formatted regular expression
func (f RegexFormatChecker) IsFormat(input interface{}) bool {
asString, ok := input.(string)
if !ok {
return true
}
if asString == "" {
return true
}
_, err := regexp.Compile(asString)
return err == nil
}
// IsFormat checks if input is a correctly formatted JSON Pointer per RFC6901
func (f JSONPointerFormatChecker) IsFormat(input interface{}) bool {
asString, ok := input.(string)
if !ok {
return true
}
return rxJSONPointer.MatchString(asString)
}
// IsFormat checks if input is a correctly formatted relative JSON Pointer
func (f RelativeJSONPointerFormatChecker) IsFormat(input interface{}) bool {
asString, ok := input.(string)
if !ok {
return true
}
return rxRelJSONPointer.MatchString(asString)
}