add individual value validator functions.

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 nostr:npub10mtatsat7ph6rsq0w8u8npt8d86x4jfr2nqjnvld2439q6f8ugqq0x27hf
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -6,7 +6,7 @@ Mirror: https://github.com/wisehodl/go-roots
 
 ## What this library does
 
-`go-roots` is a purposefully minimal Nostr protocol library for golang.
+`go-roots` is a consensus-layer Nostr protocol library for golang.
 It only provides primitives that define protocol compliance:
 
 - Event Structure
@@ -96,10 +96,7 @@ event := events.Event{
 }
 
 // 2. Compute the event ID
-id, err := event.GetID()
-if err != nil {
-    log.Fatal(err)
-}
+id := events.GetID(event)
 event.ID = id
 
 // 3. Sign the event
@@ -114,19 +111,13 @@ event.Sig = sig
 
 ```go
 // Returns canonical JSON: [0, pubkey, created_at, kind, tags, content]
-serialized, err := event.Serialize()
-if err != nil {
-    log.Fatal(err)
-}
+serialized := events.Serialize(event)
 ```
 
 #### Compute event ID manually
 
 ```go
-id, err := event.GetID()
-if err != nil {
-    log.Fatal(err)
-}
+id := events.GetID(event)
 // Returns lowercase hex SHA-256 hash of serialized form
 ```
 
@@ -138,7 +129,7 @@ if err != nil {
 
 ```go
 // Checks structure, ID computation, and signature
-if err := event.Validate(); err != nil {
+if err := events.Validate(event); err != nil {
     log.Printf("Invalid event: %v", err)
 }
 ```
@@ -147,17 +138,17 @@ if err := event.Validate(); err != nil {
 
 ```go
 // Check field formats and lengths
-if err := event.ValidateStructure(); err != nil {
+if err := events.ValidateStructure(event); err != nil {
     log.Printf("Malformed structure: %v", err)
 }
 
 // Verify ID matches computed hash
-if err := event.ValidateID(); err != nil {
+if err := events.ValidateID(event); err != nil {
     log.Printf("ID mismatch: %v", err)
 }
 
 // Verify cryptographic signature
-if err := event.ValidateSignature(); err != nil {
+if err := events.ValidateSignature(event); err != nil {
     log.Printf("Invalid signature: %v", err)
 }
 ```
@@ -186,7 +177,7 @@ if err != nil {
 }
 
 // Validate after unmarshaling
-if err := event.Validate(); err != nil {
+if err := events.Validate(event); err != nil {
     log.Printf("Received invalid event: %v", err)
 }
 ```
@@ -250,7 +241,7 @@ filter := filters.Filter{
     Kinds:   []int{1},
 }
 
-if filter.Matches(&event) {
+if filters.Matches(filter, event) {
     // Event satisfies all filter conditions
 }
 ```
@@ -269,7 +260,7 @@ filter := filters.Filter{
 
 var matches []events.Event
 for _, event := range events {
-    if filter.Matches(&event) {
+    if filters.Matches(filter, event) {
         matches = append(matches, event)
     }
 }
@@ -293,7 +284,7 @@ filter := filters.Filter{
     },
 }
 
-jsonBytes, err := filter.MarshalJSON()
+jsonBytes, err := filters.MarshalJSON(filter)
 // Result: {"ids":["abc123"],"kinds":[1],"#e":["event-id"],"search":"nostr"}
 ```
 
@@ -309,7 +300,7 @@ jsonData := `{
 }`
 
 var filter filters.Filter
-err := filter.UnmarshalJSON([]byte(jsonData))
+err := filters.UnmarshalJSON([]byte(jsonData), &filter)
 if err != nil {
     log.Fatal(err)
 }

bump.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+latest=$(git describe --tags --abbrev=0 2>/dev/null || echo "v0.0.0")
+IFS='.' read -r major minor patch <<< "${latest#v}"
+
+case ${1:-patch} in
+    major) new="v$((major+1)).0.0" ;;
+    minor) new="v${major}.$((minor+1)).0" ;;
+    patch) new="v${major}.${minor}.$((patch+1))" ;;
+    *) echo "Usage: bump.sh [major|minor|patch]" >&2; exit 1 ;;
+esac
+
+git tag -a "$new"
+

c2p

@@ -1 +1 @@
-code2prompt -e "go.sum" -e "README.md" -e "c2p" .
+code2prompt -c -e "go.sum" -e "c2p"

errors/errors.go

@@ -20,12 +20,6 @@ var (
 	// MalformedTag indicates an event tag contains fewer than two elements.
 	MalformedTag = errors.New("tags must contain at least two elements")
 
-	// FailedIDComp indicates the event ID could not be computed during validation.
-	FailedIDComp = errors.New("failed to compute event id")
-
-	// NoEventID indicates the event ID field is empty.
-	NoEventID = errors.New("event id is empty")
-
 	// InvalidSig indicates the event signature failed cryptographic validation.
 	InvalidSig = errors.New("event signature is invalid")
 )

events/event.go

@@ -3,10 +3,6 @@
 // serialization, cryptographic signatures, and subscription filters.
 package events
 
-import (
-	"regexp"
-)
-
 // Tag represents a single tag within an event as an array of strings.
 // The first element identifies the tag name, the second contains the value,
 // and subsequent elements are optional.
@@ -23,13 +19,3 @@ type Event struct {
 	Content   string `json:"content"`
 	Sig       string `json:"sig"`
 }
-
-var (
-	// Hex64Pattern matches 64-character, lowercase, hexadecimal strings.
-	// Used for validating event IDs and cryptographic keys.
-	Hex64Pattern = regexp.MustCompile("^[a-f0-9]{64}$")
-
-	// Hex128Pattern matches 128-character, lowercase, hexadecimal strings.
-	// Used for validating signatures.
-	Hex128Pattern = regexp.MustCompile("^[a-f0-9]{128}$")
-)

events/event_json_test.go

@@ -9,7 +9,7 @@ import (
 func TestUnmarshalEventJSON(t *testing.T) {
 	event := Event{}
 	json.Unmarshal(testEventJSONBytes, &event)
-	if err := event.Validate(); err != nil {
+	if err := Validate(event); err != nil {
 		t.Error("unmarshalled event is invalid")
 	}
 	expectEqualEvents(t, event, testEvent)
@@ -37,7 +37,7 @@ func TestEventJSONRoundTrip(t *testing.T) {
 	}
 	expectedJSON := `{"id":"86e856d0527dd08527498cd8afd8a7d296bde37e4757a8921f034f0b344df3ad","pubkey":"cfa87f35acbde29ba1ab3ee42de527b2cad33ac487e80cf2d6405ea0042c8fef","created_at":1760740551,"kind":1,"tags":[["a","value"],["b","value","optional"],["name","value","optional","optional"]],"content":"hello world","sig":"c05fe02a9c082ff56aad2b16b5347498a21665f02f050ba086dbe6bd593c8cd448505d2831d1c0340acc1793eaf89b7c0cb21bb696c71da6b8d6b857702bb557"}`
 
-	if err := event.Validate(); err != nil {
+	if err := Validate(event); err != nil {
 		t.Error("test event is invalid")
 	}
 	eventJSON, err := json.Marshal(event)
@@ -47,7 +47,7 @@ func TestEventJSONRoundTrip(t *testing.T) {
 	unmarshalledEvent := Event{}
 	json.Unmarshal(eventJSON, &unmarshalledEvent)
 
-	if err := unmarshalledEvent.Validate(); err != nil {
+	if err := Validate(unmarshalledEvent); err != nil {
 		t.Error("unmarshalled event is invalid")
 	}
 	expectEqualEvents(t, unmarshalledEvent, event)

events/id.go

@@ -3,35 +3,84 @@ package events
 import (
 	"crypto/sha256"
 	"encoding/hex"
-	"encoding/json"
+	"strconv"
 )
 
-// Serialize returns the canonical JSON array representation of the event.
-// used for ID computation: [0, pubkey, created_at, kind, tags, content].
-func (e *Event) Serialize() ([]byte, error) {
-	serialized := []interface{}{
-		0,
-		e.PubKey,
-		e.CreatedAt,
-		e.Kind,
-		e.Tags,
-		e.Content,
-	}
-
-	bytes, err := json.Marshal(serialized)
-	if err != nil {
-		return []byte{}, err
-	}
-	return bytes, nil
-}
-
 // GetID computes and returns the event ID as a lowercase, hex-encoded SHA-256 hash
 // of the serialized event.
-func (e *Event) GetID() (string, error) {
-	bytes, err := e.Serialize()
-	if err != nil {
-		return "", err
-	}
-	hash := sha256.Sum256(bytes)
-	return hex.EncodeToString(hash[:]), nil
+func GetID(e Event) string {
+	hash := GetIDBytes(e)
+	return hex.EncodeToString(hash[:])
+}
+
+// GetIDBytes computes and returns the event ID as a raw SHA256 digest
+func GetIDBytes(e Event) [32]byte {
+	return sha256.Sum256(Serialize(e))
+}
+
+// Serialize returns the canonical JSON array representation of the event.
+// used for ID computation: [0, pubkey, created_at, kind, tags, content].
+func Serialize(e Event) []byte {
+	buf := make([]byte, 0, 100+len(e.Content)+len(e.Tags)*80)
+	return appendSerialized(buf, e)
+}
+
+func appendSerialized(dst []byte, e Event) []byte {
+	dst = append(dst, "[0,\""...)
+	dst = append(dst, e.PubKey...)
+	dst = append(dst, "\","...)
+	dst = strconv.AppendInt(dst, int64(e.CreatedAt), 10)
+	dst = append(dst, ',')
+	dst = strconv.AppendInt(dst, int64(e.Kind), 10)
+	dst = append(dst, ",["...)
+	for i, tag := range e.Tags {
+		if i > 0 {
+			dst = append(dst, ',')
+		}
+		dst = append(dst, '[')
+		for j, s := range tag {
+			if j > 0 {
+				dst = append(dst, ',')
+			}
+			dst = appendEscapedString(dst, s)
+		}
+		dst = append(dst, ']')
+	}
+	dst = append(dst, "],"...)
+	dst = appendEscapedString(dst, e.Content)
+	return append(dst, ']')
+}
+
+func appendEscapedString(dst []byte, s string) []byte {
+	dst = append(dst, '"')
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		switch {
+		case c == '"':
+			dst = append(dst, '\\', '"')
+		case c == '\\':
+			dst = append(dst, '\\', '\\')
+		case c >= 0x20:
+			dst = append(dst, c)
+		case c == 0x08:
+			dst = append(dst, '\\', 'b')
+		case c == 0x09:
+			dst = append(dst, '\\', 't')
+		case c == 0x0a:
+			dst = append(dst, '\\', 'n')
+		case c == 0x0c:
+			dst = append(dst, '\\', 'f')
+		case c == 0x0d:
+			dst = append(dst, '\\', 'r')
+		case c < 0x09:
+			dst = append(dst, '\\', 'u', '0', '0', '0', '0'+c)
+		case c < 0x10:
+			dst = append(dst, '\\', 'u', '0', '0', '0', 0x57+c)
+		case c < 0x1a:
+			dst = append(dst, '\\', 'u', '0', '0', '1', 0x20+c)
+		case c < 0x20:
+			dst = append(dst, '\\', 'u', '0', '0', '1', 0x47+c)
+		}
+	}
+	return append(dst, '"')
 }

events/id_test.go

@@ -196,8 +196,7 @@ var idTestCases = []IDTestCase{
 func TestEventGetId(t *testing.T) {
 	for _, tc := range idTestCases {
 		t.Run(tc.name, func(t *testing.T) {
-			actual, err := tc.event.GetID()
-			assert.NoError(t, err)
+			actual := GetID(tc.event)
 			assert.Equal(t, tc.expected, actual)
 		})
 	}

events/validate.go

@@ -1,6 +1,7 @@
 package events
 
 import (
+	"bytes"
 	"encoding/hex"
 	"fmt"
 	"git.wisehodl.dev/jay/go-roots/errors"
@@ -9,30 +10,31 @@ import (
 
 // Validate performs a complete event validation: structure, ID computation,
 // and signature verification. Returns the first error encountered.
-func (e *Event) Validate() error {
-	if err := e.ValidateStructure(); err != nil {
+func Validate(e Event) error {
+	if err := ValidateStructure(e); err != nil {
 		return err
 	}
 
-	if err := e.ValidateID(); err != nil {
+	idBytes, err := checkIDMatch(e)
+	if err != nil {
 		return err
 	}
 
-	return e.ValidateSignature()
+	return validateSignatureBytes(idBytes, e.Sig, e.PubKey)
 }
 
 // ValidateStructure checks that all event fields conform to the protocol
 // specification: hex lengths, tag structure, and field formats.
-func (e *Event) ValidateStructure() error {
-	if !Hex64Pattern.MatchString(e.PubKey) {
+func ValidateStructure(e Event) error {
+	if !IsValidKey(e.PubKey) {
 		return errors.MalformedPubKey
 	}
 
-	if !Hex64Pattern.MatchString(e.ID) {
+	if !IsValidID(e.ID) {
 		return errors.MalformedID
 	}
 
-	if !Hex128Pattern.MatchString(e.Sig) {
+	if !IsValidSig(e.Sig) {
 		return errors.MalformedSig
 	}
 
@@ -46,34 +48,61 @@ func (e *Event) ValidateStructure() error {
 }
 
 // ValidateID recomputes the event ID and verifies it matches the stored ID field.
-func (e *Event) ValidateID() error {
-	computedID, err := e.GetID()
-	if err != nil {
-		return errors.FailedIDComp
-	}
-	if e.ID == "" {
-		return errors.NoEventID
-	}
-	if computedID != e.ID {
-		return fmt.Errorf("event id %q does not match computed id %q", e.ID, computedID)
-	}
-	return nil
+func ValidateID(e Event) error {
+	_, err := checkIDMatch(e)
+	return err
 }
 
 // ValidateSignature verifies the event signature is cryptographically valid
 // for the event ID and public key using Schnorr verification.
-func (e *Event) ValidateSignature() error {
+func ValidateSignature(e Event) error {
 	idBytes, err := hex.DecodeString(e.ID)
 	if err != nil {
 		return fmt.Errorf("invalid event id hex: %w", err)
 	}
+	return validateSignatureBytes(idBytes, e.Sig, e.PubKey)
+}
 
-	sigBytes, err := hex.DecodeString(e.Sig)
+// Value validators
+
+// IsValidKey verifies that a public or private key is properly formatted.
+func IsValidKey(value string) bool {
+	return isLowerHex(value, 64)
+}
+
+// IsValidKey verifies that an event id is properly formatted.
+func IsValidID(value string) bool {
+	return isLowerHex(value, 64)
+}
+
+// IsValidKey verifies that an event signature is properly formatted.
+func IsValidSig(value string) bool {
+	return isLowerHex(value, 128)
+}
+
+// Helpers
+
+func checkIDMatch(e Event) ([]byte, error) {
+	idHash := GetIDBytes(e)
+	idBytes, err := hex.DecodeString(e.ID)
+	if err != nil {
+		return nil, errors.MalformedID
+	}
+	if !bytes.Equal(idBytes, idHash[:]) {
+		return nil, fmt.Errorf(
+			"event id %q does not match computed id %q",
+			e.ID, hex.EncodeToString(idHash[:]))
+	}
+	return idBytes, nil
+}
+
+func validateSignatureBytes(idBytes []byte, sigHex, pkHex string) error {
+	sigBytes, err := hex.DecodeString(sigHex)
 	if err != nil {
 		return fmt.Errorf("invalid event signature hex: %w", err)
 	}
 
-	pkBytes, err := hex.DecodeString(e.PubKey)
+	pkBytes, err := hex.DecodeString(pkHex)
 	if err != nil {
 		return fmt.Errorf("invalid public key hex: %w", err)
 	}
@@ -90,7 +119,20 @@ func (e *Event) ValidateSignature() error {
 
 	if signature.Verify(idBytes, publicKey) {
 		return nil
-	} else {
-		return errors.InvalidSig
 	}
+
+	return errors.InvalidSig
+}
+
+func isLowerHex(s string, n int) bool {
+	if len(s) != n {
+		return false
+	}
+	for i := 0; i < n; i++ {
+		c := s[i]
+		if (c < '0' || c > '9') && (c < 'a' || c > 'f') {
+			return false
+		}
+	}
+	return true
 }

events/validate_test.go

@@ -184,7 +184,7 @@ var structureTestCases = []ValidateEventTestCase{
 func TestValidateEventStructure(t *testing.T) {
 	for _, tc := range structureTestCases {
 		t.Run(tc.name, func(t *testing.T) {
-			err := tc.event.ValidateStructure()
+			err := ValidateStructure(tc.event)
 			assert.ErrorContains(t, err, tc.expectedError)
 		})
 	}
@@ -201,7 +201,7 @@ func TestValidateEventIDFailure(t *testing.T) {
 		Sig:       testEvent.Sig,
 	}
 
-	err := event.ValidateID()
+	err := ValidateID(event)
 	assert.ErrorContains(t, err, "does not match computed id")
 }
 
@@ -211,7 +211,7 @@ func TestValidateSignature(t *testing.T) {
 		PubKey: testEvent.PubKey,
 		Sig:    testEvent.Sig,
 	}
-	err := event.ValidateSignature()
+	err := ValidateSignature(event)
 
 	assert.NoError(t, err)
 }
@@ -222,7 +222,7 @@ func TestValidateInvalidSignature(t *testing.T) {
 		PubKey: testEvent.PubKey,
 		Sig:    "9e43cbcf7e828a21c53fa35371ee79bffbfd7a3063ae46fc05ec623dd3186667c57e3d006488015e19247df35eb41c61013e051aa87860e23fa5ffbd44120482",
 	}
-	err := event.ValidateSignature()
+	err := ValidateSignature(event)
 
 	assert.ErrorContains(t, err, "event signature is invalid")
 }
@@ -281,7 +281,7 @@ func TestValidateSignatureInvalidEventSignature(t *testing.T) {
 	for _, tc := range validateSignatureTestCases {
 		t.Run(tc.name, func(t *testing.T) {
 			event := Event{ID: tc.id, PubKey: tc.pubkey, Sig: tc.sig}
-			err := event.ValidateSignature()
+			err := ValidateSignature(event)
 			assert.ErrorContains(t, err, tc.expectedError)
 		})
 	}
@@ -301,6 +301,6 @@ func TestValidateEvent(t *testing.T) {
 		Sig:     "668a715f1eb983172acf230d17bd283daedb2598adf8de4290bcc7eb0b802fdb60669d1e7d1104ac70393f4dbccd07e8abf897152af6ce6c0a75499874e27f14",
 	}
 
-	err := event.Validate()
+	err := Validate(event)
 	assert.NoError(t, err)
 }

filters/filter.go

@@ -29,7 +29,7 @@ type Filter struct {
 
 // MarshalJSON converts the filter to JSON with standard fields, tag filters
 // (prefixed with "#"), and extensions merged into a single object.
-func (f *Filter) MarshalJSON() ([]byte, error) {
+func MarshalJSON(f Filter) ([]byte, error) {
 	outputMap := make(map[string]interface{})
 
 	// Add standard fields
@@ -86,7 +86,7 @@ func (f *Filter) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON parses JSON into the filter, separating standard fields,
 // tag filters (keys starting with "#"), and extensions.
-func (f *Filter) UnmarshalJSON(data []byte) error {
+func UnmarshalJSON(data []byte, f *Filter) error {
 	// Decode into raw map
 	raw := make(FilterExtensions)
 	if err := json.Unmarshal(data, &raw); err != nil {
@@ -182,7 +182,7 @@ func (f *Filter) UnmarshalJSON(data []byte) error {
 // Matches returns true if the event satisfies all filter conditions.
 // Supports prefix matching for IDs and authors, and tag filtering.
 // Does not account for custom extensions.
-func (f *Filter) Matches(event *events.Event) bool {
+func Matches(f Filter, event events.Event) bool {
 	// Check ID
 	if len(f.IDs) > 0 {
 		if !matchesPrefix(event.ID, f.IDs) {

filters/filter_json_test.go

@@ -584,7 +584,7 @@ var roundTripTestCases = []FilterRoundTripTestCase{
 func TestFilterMarshalJSON(t *testing.T) {
 	for _, tc := range marshalTestCases {
 		t.Run(tc.name, func(t *testing.T) {
-			result, err := tc.filter.MarshalJSON()
+			result, err := MarshalJSON(tc.filter)
 			assert.NoError(t, err)
 
 			var expectedMap, actualMap map[string]interface{}
@@ -602,7 +602,7 @@ func TestFilterUnmarshalJSON(t *testing.T) {
 	for _, tc := range unmarshalTestCases {
 		t.Run(tc.name, func(t *testing.T) {
 			var result Filter
-			err := result.UnmarshalJSON([]byte(tc.input))
+			err := UnmarshalJSON([]byte(tc.input), &result)
 			assert.NoError(t, err)
 
 			expectEqualFilters(t, result, tc.expected)
@@ -613,11 +613,11 @@ func TestFilterUnmarshalJSON(t *testing.T) {
 func TestFilterRoundTrip(t *testing.T) {
 	for _, tc := range roundTripTestCases {
 		t.Run(tc.name, func(t *testing.T) {
-			jsonBytes, err := tc.filter.MarshalJSON()
+			jsonBytes, err := MarshalJSON(tc.filter)
 			assert.NoError(t, err)
 
 			var result Filter
-			err = result.UnmarshalJSON(jsonBytes)
+			err = UnmarshalJSON(jsonBytes, &result)
 			assert.NoError(t, err)
 
 			expectEqualFilters(t, result, tc.filter)

filters/filter_match_test.go

@@ -391,7 +391,7 @@ func TestEventFilterMatching(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			actualIDs := []string{}
 			for _, event := range testEvents {
-				if tc.filter.Matches(&event) {
+				if Matches(tc.filter, event) {
 					actualIDs = append(actualIDs, event.ID[:8])
 				}
 			}
@@ -416,5 +416,5 @@ func TestEventFilterMatchingSkipMalformedTags(t *testing.T) {
 		},
 	}
 
-	assert.True(t, filter.Matches(&event))
+	assert.True(t, Matches(filter, event))
 }