validate

package
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 Go to latest Published: May 28, 2026 License: MIT Imports: 9 Imported by: 0

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Index

Constants

This section is empty.

Variables

View Source 
var CIDR = codex.Constraint[string]{
	Name: "cidr",
	Check: func(v string) bool {
		_, _, err := net.ParseCIDR(v)
		return err == nil
	},
	Message: func(v string) string { return fmt.Sprintf("invalid CIDR notation: %q", v) },
}

CIDR is a Constraint that requires a valid CIDR notation string (e.g. "192.168.0.0/24", "10.0.0.0/8", "::/0"). Host bits may be set (e.g. "192.168.0.1/24" is accepted). No schema annotation — there is no standard JSON Schema format for CIDR.

View Source 
var Date = codex.Constraint[string]{
	Name: "date",
	Check: func(v string) bool {
		_, err := time.Parse("2006-01-02", v)
		return err == nil
	},
	Message: func(v string) string { return fmt.Sprintf("invalid date (expected YYYY-MM-DD): %q", v) },
	Schema:  withFormat("date"),
}

Date is a Constraint that requires an ISO 8601 date string (YYYY-MM-DD).

View Source 
var DateTime = codex.Constraint[string]{
	Name: "date-time",
	Check: func(v string) bool {
		_, err := time.Parse(time.RFC3339, v)
		if err == nil {
			return true
		}
		_, err = time.Parse(time.RFC3339Nano, v)
		return err == nil
	},
	Message: func(v string) string { return fmt.Sprintf("invalid date-time (expected RFC 3339): %q", v) },
	Schema:  withFormat("date-time"),
}

DateTime is a Constraint that requires an RFC 3339 date-time string.

View Source 
var Email = codex.Constraint[string]{
	Name:    "email",
	Check:   func(v string) bool { return reEmail.MatchString(v) },
	Message: func(v string) string { return fmt.Sprintf("invalid email address: %q", v) },
	Schema:  withFormat("email"),
}

Email is a Constraint that requires a valid email address. Validation uses a standard format check; it does not perform DNS lookup.

View Source 
var HTTPPath = codex.Constraint[string]{
	Name:  "http-path",
	Check: func(v string) bool { return httpPathRe.MatchString(v) },
	Message: func(v string) string {
		switch {
		case v == "" || v[0] != '/':
			return fmt.Sprintf("http path must start with '/', got %q", v)
		case strings.ContainsRune(v, 0):
			return fmt.Sprintf("http path must not contain null bytes, got %q", v)
		case strings.ContainsRune(v, ' '):
			return fmt.Sprintf("http path must not contain unencoded spaces, got %q", v)
		default:
			return fmt.Sprintf("invalid http path: %q", v)
		}
	},
}

HTTPPath is a Constraint that validates an HTTP path string. It requires the path to start with '/' and contain no unencoded spaces or null bytes. OpenAPI-style path parameters (e.g. /users/{id}) are permitted.

View Source 
var Hostname = codex.Constraint[string]{
	Name: "hostname",
	Check: func(v string) bool {
		return len(v) <= 253 && len(v) > 0 && reHostname.MatchString(v)
	},
	Message: func(v string) string { return fmt.Sprintf("invalid hostname: %q", v) },
	Schema:  withFormat("hostname"),
}

Hostname is a Constraint that requires a valid RFC 1123 hostname. Labels must be 1–63 characters; total length must not exceed 253 characters.

View Source 
var IPv4 = codex.Constraint[string]{
	Name: "ipv4",
	Check: func(v string) bool {
		ip := net.ParseIP(v)
		return ip != nil && ip.To4() != nil && strings.Contains(v, ".")
	},
	Message: func(v string) string { return fmt.Sprintf("invalid IPv4 address: %q", v) },
	Schema:  withFormat("ipv4"),
}

IPv4 is a Constraint that requires a valid IPv4 address.

View Source 
var IPv6 = codex.Constraint[string]{
	Name: "ipv6",
	Check: func(v string) bool {
		ip := net.ParseIP(v)
		return ip != nil && ip.To4() == nil
	},
	Message: func(v string) string { return fmt.Sprintf("invalid IPv6 address: %q", v) },
	Schema:  withFormat("ipv6"),
}

IPv6 is a Constraint that requires a valid IPv6 address.

View Source 
var MQTTPublishTopic = codex.Constraint[string]{
	Name: "mqtt-publish-topic",
	Check: func(v string) bool {
		return v != "" && !strings.ContainsRune(v, 0) && len(v) <= 65535 &&
			!strings.ContainsAny(v, "+#")
	},
	Message: func(v string) string {
		switch {
		case v == "":
			return "mqtt publish topic must not be empty"
		case strings.ContainsRune(v, 0):
			return "mqtt publish topic must not contain null bytes"
		case len(v) > 65535:
			return fmt.Sprintf("mqtt publish topic exceeds maximum length of 65535 bytes, got %d", len(v))
		case strings.ContainsAny(v, "+#"):
			return fmt.Sprintf("mqtt publish topic must not contain wildcard characters '+' or '#', got %q", v)
		default:
			return fmt.Sprintf("invalid mqtt publish topic: %q", v)
		}
	},
}

MQTTPublishTopic is a Constraint that validates an MQTT topic string for publishing. It applies all rules from MQTTTopic and additionally forbids wildcard characters ('+' and '#'), which are reserved for subscriptions only.

View Source 
var MQTTTopic = codex.Constraint[string]{
	Name: "mqtt-topic",
	Check: func(v string) bool {
		return v != "" && !strings.ContainsRune(v, 0) && utf8.RuneCountInString(v) > 0 && len(v) <= 65535
	},
	Message: func(v string) string {
		switch {
		case v == "":
			return "mqtt topic must not be empty"
		case strings.ContainsRune(v, 0):
			return "mqtt topic must not contain null bytes"
		case len(v) > 65535:
			return fmt.Sprintf("mqtt topic exceeds maximum length of 65535 bytes, got %d", len(v))
		default:
			return fmt.Sprintf("invalid mqtt topic: %q", v)
		}
	},
}

MQTTTopic is a Constraint that validates an MQTT topic string for general use (subscribe or publish). It requires the string to be non-empty, contain no null bytes (U+0000), and be at most 65535 UTF-8 bytes — as required by the MQTT specification (section 4.7).

View Source 
var NegativeFloat = codex.Constraint[float64]{
	Name:    "negative",
	Check:   func(v float64) bool { return v < 0 },
	Message: func(v float64) string { return fmt.Sprintf("expected negative number, got %g", v) },
	Schema: func(s schema.Schema) schema.Schema {
		s.Maximum = float64ptr(0)
		s.ExclusiveMaximum = true
		return s
	},
}

NegativeFloat is a Constraint that requires float64 < 0.

View Source 
var NegativeInt = codex.Constraint[int]{
	Name:    "negative",
	Check:   func(v int) bool { return v < 0 },
	Message: func(v int) string { return fmt.Sprintf("expected negative integer, got %d", v) },
	Schema: func(s schema.Schema) schema.Schema {
		s.Maximum = float64ptr(0)
		s.ExclusiveMaximum = true
		return s
	},
}

NegativeInt is a Constraint that requires int < 0.

View Source 
var NegativeInt32 = codex.Constraint[int32]{
	Name:    "negative",
	Check:   func(v int32) bool { return v < 0 },
	Message: func(v int32) string { return fmt.Sprintf("expected negative integer, got %d", v) },
	Schema: func(s schema.Schema) schema.Schema {
		s.Maximum = float64ptr(0)
		s.ExclusiveMaximum = true
		return s
	},
}

NegativeInt32 is a Constraint that requires int32 < 0.

View Source 
var NegativeInt64 = codex.Constraint[int64]{
	Name:    "negative",
	Check:   func(v int64) bool { return v < 0 },
	Message: func(v int64) string { return fmt.Sprintf("expected negative integer, got %d", v) },
	Schema: func(s schema.Schema) schema.Schema {
		s.Maximum = float64ptr(0)
		s.ExclusiveMaximum = true
		return s
	},
}

NegativeInt64 is a Constraint that requires int64 < 0.

View Source 
var NonEmptyString = codex.Constraint[string]{
	Name:    "non-empty",
	Check:   func(v string) bool { return v != "" },
	Message: func(v string) string { return "expected non-empty string" },
	Schema: func(s schema.Schema) schema.Schema {
		s.MinLength = intptr(1)
		return s
	},
}

NonEmptyString is a Constraint that requires a non-empty string.

View Source 
var NonNegativeDuration = codex.Constraint[time.Duration]{
	Name:    "nonNegative",
	Check:   func(v time.Duration) bool { return v >= 0 },
	Message: func(v time.Duration) string { return fmt.Sprintf("expected non-negative duration, got %s", v) },
}

NonNegativeDuration is a Constraint that requires time.Duration >= 0.

View Source 
var NonZeroFloat = codex.Constraint[float64]{
	Name:    "nonzero",
	Check:   func(v float64) bool { return v != 0 },
	Message: func(v float64) string { return "expected non-zero number, got 0" },
}

NonZeroFloat is a Constraint that requires float64 != 0.

View Source 
var NonZeroInt = codex.Constraint[int]{
	Name:    "nonzero",
	Check:   func(v int) bool { return v != 0 },
	Message: func(_ int) string { return "expected non-zero integer, got 0" },
}

NonZeroInt is a Constraint that requires int != 0.

View Source 
var PositiveDuration = codex.Constraint[time.Duration]{
	Name:    "positive",
	Check:   func(v time.Duration) bool { return v > 0 },
	Message: func(v time.Duration) string { return fmt.Sprintf("expected positive duration, got %s", v) },
}

PositiveDuration is a Constraint that requires time.Duration > 0.

View Source 
var PositiveFloat = codex.Constraint[float64]{
	Name:    "positive",
	Check:   func(v float64) bool { return v > 0 },
	Message: func(v float64) string { return fmt.Sprintf("expected positive number, got %g", v) },
	Schema: func(s schema.Schema) schema.Schema {
		s.Minimum = float64ptr(0)
		s.ExclusiveMinimum = true
		return s
	},
}

PositiveFloat is a Constraint that requires float64 > 0.

View Source 
var PositiveInt = codex.Constraint[int]{
	Name:    "positive",
	Check:   func(v int) bool { return v > 0 },
	Message: func(v int) string { return fmt.Sprintf("expected positive integer, got %d", v) },
	Schema: func(s schema.Schema) schema.Schema {
		s.Minimum = float64ptr(0)
		s.ExclusiveMinimum = true
		return s
	},
}

PositiveInt is a Constraint that requires int > 0.

View Source 
var PositiveInt32 = codex.Constraint[int32]{
	Name:    "positive",
	Check:   func(v int32) bool { return v > 0 },
	Message: func(v int32) string { return fmt.Sprintf("expected positive integer, got %d", v) },
	Schema: func(s schema.Schema) schema.Schema {
		s.Minimum = float64ptr(0)
		s.ExclusiveMinimum = true
		return s
	},
}

PositiveInt32 is a Constraint that requires int32 > 0.

View Source 
var PositiveInt64 = codex.Constraint[int64]{
	Name:    "positive",
	Check:   func(v int64) bool { return v > 0 },
	Message: func(v int64) string { return fmt.Sprintf("expected positive integer, got %d", v) },
	Schema: func(s schema.Schema) schema.Schema {
		s.Minimum = float64ptr(0)
		s.ExclusiveMinimum = true
		return s
	},
}

PositiveInt64 is a Constraint that requires int64 > 0.

View Source 
var PositiveUint = codex.Constraint[uint]{
	Name:    "positive",
	Check:   func(v uint) bool { return v > 0 },
	Message: func(v uint) string { return fmt.Sprintf("expected positive integer, got %d", v) },
	Schema: func(s schema.Schema) schema.Schema {
		s.Minimum = float64ptr(0)
		s.ExclusiveMinimum = true
		return s
	},
}

PositiveUint is a Constraint that requires uint > 0.

View Source 
var PositiveUint64 = codex.Constraint[uint64]{
	Name:    "positive",
	Check:   func(v uint64) bool { return v > 0 },
	Message: func(v uint64) string { return fmt.Sprintf("expected positive integer, got %d", v) },
	Schema: func(s schema.Schema) schema.Schema {
		s.Minimum = float64ptr(0)
		s.ExclusiveMinimum = true
		return s
	},
}

PositiveUint64 is a Constraint that requires uint64 > 0.

View Source 
var SemVer = codex.Constraint[string]{
	Name:  "semver",
	Check: func(v string) bool { return reSemVer.MatchString(v) },
	Message: func(v string) string {
		return fmt.Sprintf("invalid semantic version (expected MAJOR.MINOR.PATCH): %q", v)
	},
	Schema: func(s schema.Schema) schema.Schema {
		s.Pattern = reSemVer.String()
		return s
	},
}

SemVer is a Constraint that requires a semantic version string following semver.org spec, with an optional leading "v" prefix. Examples: "1.2.3", "v2.0.0-alpha+build.123".

View Source 
var Slug = codex.Constraint[string]{
	Name:  "slug",
	Check: func(v string) bool { return reSlug.MatchString(v) },
	Message: func(v string) string {
		return fmt.Sprintf("invalid slug (lowercase alphanumeric and hyphens only): %q", v)
	},
	Schema: func(s schema.Schema) schema.Schema {
		s.Pattern = reSlug.String()
		return s
	},
}

Slug is a Constraint that requires a URL-friendly slug (lowercase alphanumeric and hyphens). Example valid slugs: "hello-world", "my-post-123".

View Source 
var Time = codex.Constraint[string]{
	Name: "time",
	Check: func(v string) bool {
		dummy := "2000-01-01T" + v
		_, err := time.Parse(time.RFC3339, dummy)
		if err == nil {
			return true
		}
		_, err = time.Parse(time.RFC3339Nano, dummy)
		return err == nil
	},
	Message: func(v string) string {
		return fmt.Sprintf("invalid time (expected HH:MM:SS[.frac]Z or ±offset): %q", v)
	},
	Schema: withFormat("time"),
}

Time is a Constraint that requires an RFC 3339 full-time string (e.g. "10:30:00Z", "10:30:00.5+02:00").

View Source 
var URI = codex.Constraint[string]{
	Name: "uri",
	Check: func(v string) bool {
		u, err := url.ParseRequestURI(v)
		return err == nil && u.Scheme != "" && u.Host != ""
	},
	Message: func(v string) string { return fmt.Sprintf("invalid URI: %q", v) },
	Schema:  withFormat("uri"),
}

URI is a Constraint that requires a valid absolute URI with any scheme. Use this for non-HTTP URIs such as grpc://, ws://, or custom schemes.

View Source 
var URL = URLWithSchemes("http", "https")

URL is a Constraint that requires a valid absolute URL with http or https scheme.

View Source 
var UUID = codex.Constraint[string]{
	Name:    "uuid",
	Check:   func(v string) bool { return reUUID.MatchString(v) },
	Message: func(v string) string { return fmt.Sprintf("invalid UUID: %q", v) },
	Schema:  withFormat("uuid"),
}

UUID is a Constraint that requires a valid UUID (any version, RFC 4122 format).

Functions

func MaxBytes 

func MaxBytes(n int) codex.Constraint[[]byte]

MaxBytes returns a Constraint that requires a byte slice of at most n bytes. The check applies to the decoded byte count, not the base64-encoded string length.

func MaxDuration added in v0.3.0 

func MaxDuration(d time.Duration) codex.Constraint[time.Duration]

MaxDuration returns a Constraint that requires time.Duration <= d.

func MaxFloat 

func MaxFloat(n float64) codex.Constraint[float64]

MaxFloat returns a Constraint that requires float64 <= n.

func MaxInt 

func MaxInt(n int) codex.Constraint[int]

MaxInt returns a Constraint that requires int <= n.

func MaxInt32 added in v0.3.0 

func MaxInt32(n int32) codex.Constraint[int32]

MaxInt32 returns a Constraint that requires int32 <= n.

func MaxInt64 added in v0.3.0 

func MaxInt64(n int64) codex.Constraint[int64]

MaxInt64 returns a Constraint that requires int64 <= n.

func MaxLen 

func MaxLen(n int) codex.Constraint[string]

MaxLen returns a Constraint that requires a string of at most n characters.

func MaxUint added in v0.3.0 

func MaxUint(n uint) codex.Constraint[uint]

MaxUint returns a Constraint that requires uint <= n.

func MaxUint64 added in v0.3.0 

func MaxUint64(n uint64) codex.Constraint[uint64]

MaxUint64 returns a Constraint that requires uint64 <= n.

func MinBytes 

func MinBytes(n int) codex.Constraint[[]byte]

MinBytes returns a Constraint that requires a byte slice of at least n bytes. The check applies to the decoded byte count, not the base64-encoded string length.

func MinDuration added in v0.3.0 

func MinDuration(d time.Duration) codex.Constraint[time.Duration]

MinDuration returns a Constraint that requires time.Duration >= d.

func MinFloat 

func MinFloat(n float64) codex.Constraint[float64]

MinFloat returns a Constraint that requires float64 >= n.

func MinInt 

func MinInt(n int) codex.Constraint[int]

MinInt returns a Constraint that requires int >= n.

func MinInt32 added in v0.3.0 

func MinInt32(n int32) codex.Constraint[int32]

MinInt32 returns a Constraint that requires int32 >= n.

func MinInt64 added in v0.3.0 

func MinInt64(n int64) codex.Constraint[int64]

MinInt64 returns a Constraint that requires int64 >= n.

func MinLen 

func MinLen(n int) codex.Constraint[string]

MinLen returns a Constraint that requires a string of at least n characters.

func MinUint added in v0.3.0 

func MinUint(n uint) codex.Constraint[uint]

MinUint returns a Constraint that requires uint >= n.

func MinUint64 added in v0.3.0 

func MinUint64(n uint64) codex.Constraint[uint64]

MinUint64 returns a Constraint that requires uint64 >= n.

func OneOf 

func OneOf(values ...string) codex.Constraint[string]

OneOf returns a Constraint that requires the string to be one of the given values.

func Pattern 

func Pattern(re *regexp.Regexp) codex.Constraint[string]

Pattern returns a Constraint that requires the string to match the given regular expression. The caller is responsible for compiling the regexp (use regexp.MustCompile for literals).

func RangeFloat 

func RangeFloat(min, max float64) codex.Constraint[float64]

RangeFloat returns a Constraint that requires min <= float64 <= max.

func RangeInt 

func RangeInt(min, max int) codex.Constraint[int]

RangeInt returns a Constraint that requires min <= int <= max.

func RangeInt32 added in v0.3.0 

func RangeInt32(min, max int32) codex.Constraint[int32]

RangeInt32 returns a Constraint that requires min <= int32 <= max.

func RangeInt64 added in v0.3.0 

func RangeInt64(min, max int64) codex.Constraint[int64]

RangeInt64 returns a Constraint that requires min <= int64 <= max.

func RangeUint added in v0.3.0 

func RangeUint(min, max uint) codex.Constraint[uint]

RangeUint returns a Constraint that requires min <= uint <= max.

func RangeUint64 added in v0.3.0 

func RangeUint64(min, max uint64) codex.Constraint[uint64]

RangeUint64 returns a Constraint that requires min <= uint64 <= max.

func URLWithSchemes added in v0.3.0 

func URLWithSchemes(schemes ...string) codex.Constraint[string]

URLWithSchemes returns a Constraint that requires a valid absolute URL whose scheme is one of the provided values. The host must be non-empty. Schema annotation uses JSON Schema format "uri".

Types

This section is empty.

Source Files

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