feat: add crypto address string format rules

README.md

@@ -37,6 +37,7 @@ for upcoming, planned features.
     8. [Validation plan](#validation-plan)
     9. [Properties path inference](#properties-path-inference)
     10. [Testing helpers](#testing-helpers)
+    11. [Minimal dependencies](#dependency-policy)
 4. [Rationale](#rationale)
     1. [Reflection](#reflection)
     2. [Trivia](#trivia)
@@ -731,6 +732,18 @@ writing unit tests for validation rules defined with govy.
 Checkout [testable examples](https://pkg.go.dev/github.com/nobl9/govy/pkg/govytest#pkg-examples)
 for a concise overview of the package's capabilities.
 
+### Dependency policy
+
+Govy **strives** to be dependency free.
+We'd rather implement the required code ourselves then burden your projects
+with bloated dependency tree.
+Doing otherwise is in our honest opinion lazy and not secure!
+
+The only external dependencies you will inherit from govy are the modules
+officially maintained by the Go team under [golang.org/x](https://pkg.go.dev/golang.org/x).
+Here, the trade-off is in favor of the external source,
+which is high quality and under constant security scrutiny and maintenance.
+
 ## Rationale
 
 Why was this library created?

cspell.json

@@ -13,6 +13,8 @@
   ],
   "ignoreRegExpList": [
     "/\\|\\s+[T|G]{2,}\\s+\\|/g",
+    "/\\b[13mn2][0-9A-HJ-NP-Za-km-z]{25,34}\\b/g",
+    "/\\b(?:bc|tb)1[ac-hj-np-z02-9]{11,71}\\b/gi",
     "/https?:\\/\\/.*/g",
     "/github.*/g",
     "/nolint.*/g",
@@ -42,6 +44,8 @@
     "UUIDRFC",
     "afbf",
     "atoi",
+    "bech",
+    "bips",
     "cidrv",
     "devbox",
     "edebfe",
@@ -61,6 +65,7 @@
     "govyconfig",
     "govytest",
     "issn",
+    "keccak",
     "ldflags",
     "Leonean",
     "luhn",
@@ -70,18 +75,23 @@
     "println",
     "rtmp",
     "renminbi",
+    "segwit",
     "sloctl",
     "strconv",
     "structs",
     "tmpl",
     "tpng",
+    "unchecksummed",
     "uuidv",
     "vuln",
     "vulns",
+    "wpkh",
     "Implicits",
     "mygovy",
     "unpadded",
     "JWSB64",
-    "ITIN"
+    "ITIN",
+    "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz",
+    "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
   ]
 }

docs/DEVELOPMENT.md

@@ -71,6 +71,10 @@ Refer to this [README.md](../internal/validation/README.md) for more information
 
 ## Dependencies
 
+The only acceptable dependencies are the
+[golang.org/x](https://pkg.go.dev/golang.org/x) modules.
+Any other third-party dependency is to be rejected.
+
 Renovate is configured to automatically merge minor and patch updates.
 For major versions, which sadly includes GitHub Actions, manual approval
 is required.

go.mod

@@ -3,11 +3,13 @@ module github.com/nobl9/govy
 go 1.25.5
 
 require (
+	golang.org/x/crypto v0.54.0
 	golang.org/x/text v0.40.0
 	golang.org/x/tools v0.48.0
 )
 
 require (
 	golang.org/x/mod v0.38.0 // indirect
 	golang.org/x/sync v0.22.0 // indirect
+	golang.org/x/sys v0.47.0 // indirect
 )

go.sum

@@ -1,9 +1,13 @@
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+golang.org/x/crypto v0.54.0 h1:YLIA59K4fiNzHzjnZt2tUJQjQtUWfWbeHBqKtk3eScw=
+golang.org/x/crypto v0.54.0/go.mod h1:KWL8ny2AZdGR2cWmzeHrp2azQPGogOv+HeQaVEXC2dk=
 golang.org/x/mod v0.38.0 h1:MECBjubtXD7yj4HrhIUcywNaGeNVUdfVnxmPajOk4yk=
 golang.org/x/mod v0.38.0/go.mod h1:V6Xz0pq8TQ3dGqVQ1FVHuelZpAL0uNhSkk9ogYP3c40=
 golang.org/x/sync v0.22.0 h1:SZjpbeLmrCk4xhRSZFNZW5gFUeCeFgjekvI/+gfScek=
 golang.org/x/sync v0.22.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
+golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
+golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/text v0.40.0 h1:Ub2Z6/xjgF1WrYQz2nuITOEegKFtiIy+rieRJ5lHZKs=
 golang.org/x/text v0.40.0/go.mod h1:hpnzDAfGV753zIKo+wk3u1bVKCGPbrnF7+7LBF/UHVY=
 golang.org/x/tools v0.48.0 h1:3+hClM1aLL5mjMKm5ovokw9epgRXPuu2tILgismM6RE=

internal/messagetemplates/templates.go

@@ -102,6 +102,9 @@ const (
 	StringLatitudeTemplate
 	StringLongitudeTemplate
 	StringKubernetesQualifiedNameTemplate
+	StringBTCAddressTemplate
+	StringBTCBech32AddressTemplate
+	StringETHAddressTemplate
 	StringMongoDBObjectIDTemplate
 	URLTemplate
 	SliceUniqueTemplate
@@ -256,7 +259,10 @@ var rawMessageTemplates = map[templateKey]string{
 	string must be a valid Kubernetes Qualified Name
 {{- end }}
 `,
-	StringMongoDBObjectIDTemplate: "string must be a 24-character hexadecimal MongoDB ObjectID",
+	StringBTCAddressTemplate:       "string must be a valid mainnet legacy Bitcoin Base58Check address",
+	StringBTCBech32AddressTemplate: "string must be a valid mainnet Bitcoin Bech32 address",
+	StringETHAddressTemplate:       "string must be a valid Ethereum address (0x plus 40 hexadecimal characters)",
+	StringMongoDBObjectIDTemplate:  "string must be a 24-character hexadecimal MongoDB ObjectID",
 	SliceUniqueTemplate: `elements are not unique, {{ .Custom.FirstOrdinal }} and {{ .Custom.SecondOrdinal }} elements collide
 {{- if gt (len .Custom.Constraints) 0 }} based on constraints: {{ joinSlice .Custom.Constraints "" }}{{- end }}`,
 	UniquePropertiesTemplate: `all of [{{ joinSlice .ComparisonValue "" }}] properties must be unique, but '{{ .Custom.FirstProperty }}' collides with '{{ .Custom.SecondProperty }}'

pkg/rules/error_codes.go

@@ -90,6 +90,9 @@ const (
 	ErrorCodeStringAlphanumericUnicode     govy.ErrorCode = "string_alphanumeric_unicode"
 	ErrorCodeStringFQDN                    govy.ErrorCode = "string_fqdn"
 	ErrorCodeStringKubernetesQualifiedName govy.ErrorCode = "string_kubernetes_qualified_name"
+	ErrorCodeStringBTCAddress              govy.ErrorCode = "string_btc_address"
+	ErrorCodeStringBTCBech32Address        govy.ErrorCode = "string_btc_bech32_address"
+	ErrorCodeStringETHAddress              govy.ErrorCode = "string_eth_address"
 	ErrorCodeStringMongoDBObjectID         govy.ErrorCode = "string_mongodb_object_id"
 	ErrorCodeSliceLength                   govy.ErrorCode = "slice_length"
 	ErrorCodeSliceMinLength                govy.ErrorCode = "slice_min_length"

pkg/rules/regex.go

@@ -29,6 +29,7 @@ var (
 	fqdnRegexp                 = lazyRegexCompile(
 		`^([a-zA-Z0-9]{1}[a-zA-Z0-9-]{0,62})(\.[a-zA-Z0-9]{1}[a-zA-Z0-9-]{0,62})*?(\.[a-zA-Z]{1}[a-zA-Z0-9]{0,62})\.?$`,
 	)
+	btcAddressRegexp = lazyRegexCompile(`^[13][1-9A-HJ-NP-Za-km-z]{25,34}$`)
 )
 
 // lazyRegexCompile returns a function that compiles the regular expression