add base64 validate as requested in issue #30

baked_in.go

@@ -37,6 +37,11 @@ var BakedInValidators = map[string]Func{
 	"email":       isEmail,
 	"url":         isURL,
 	"uri":         isURI,
+	"base64":      isBase64,
+}
+
+func isBase64(top interface{}, current interface{}, field interface{}, param string) bool {
+	return matchesRegex(base64Regex, field)
 }
 
 func isURI(top interface{}, current interface{}, field interface{}, param string) bool {

regexes.go

@@ -14,6 +14,7 @@ const (
 	hslRegexString          = "^hsl\\(\\s*(0|[1-9]\\d?|[12]\\d\\d|3[0-5]\\d|360)\\s*,\\s*((0|[1-9]\\d?|100)%)\\s*,\\s*((0|[1-9]\\d?|100)%)\\s*\\)$"
 	hslaRegexString         = "^hsla\\(\\s*(0|[1-9]\\d?|[12]\\d\\d|3[0-5]\\d|360)\\s*,\\s*((0|[1-9]\\d?|100)%)\\s*,\\s*((0|[1-9]\\d?|100)%)\\s*,\\s*((0.[1-9]*)|[01])\\s*\\)$"
 	emailRegexString        = "^(((([a-zA-Z]|\\d|[!#\\$%&'\\*\\+\\-\\/=\\?\\^_`{\\|}~]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])+(\\.([a-zA-Z]|\\d|[!#\\$%&'\\*\\+\\-\\/=\\?\\^_`{\\|}~]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])+)*)|((\\x22)((((\\x20|\\x09)*(\\x0d\\x0a))?(\\x20|\\x09)+)?(([\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f]|\\x21|[\\x23-\\x5b]|[\\x5d-\\x7e]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])|(\\([\\x01-\\x09\\x0b\\x0c\\x0d-\\x7f]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}]))))*(((\\x20|\\x09)*(\\x0d\\x0a))?(\\x20|\\x09)+)?(\\x22)))@((([a-zA-Z]|\\d|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])|(([a-zA-Z]|\\d|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])([a-zA-Z]|\\d|-|\\.|_|~|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])*([a-zA-Z]|\\d|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])))\\.)+(([a-zA-Z]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])|(([a-zA-Z]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])([a-zA-Z]|\\d|-|\\.|_|~|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])*([a-zA-Z]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])))\\.?$"
+	base64RegexString       = "(?:^(?:[A-Za-z0-9+\\/]{4}\\n?)*(?:[A-Za-z0-9+\\/]{2}==|[A-Za-z0-9+\\/]{3}=)$)"
 )
 
 var (
@@ -28,6 +29,7 @@ var (
 	hslRegex          = regexp.MustCompile(hslRegexString)
 	hslaRegex         = regexp.MustCompile(hslaRegexString)
 	emailRegex        = regexp.MustCompile(emailRegexString)
+	base64Regex       = regexp.MustCompile(base64RegexString)
 )
 
 func matchesRegex(regex *regexp.Regexp, field interface{}) bool {

validator_test.go

@@ -6,10 +6,16 @@ import (
 	"testing"
 	"time"
 
-	"gopkg.in/bluesuncorp/validator.v5"
+	// "gopkg.in/bluesuncorp/validator.v5"
+	"github.com/joeybloggs/validator"
 	. "gopkg.in/check.v1"
 )
 
+// NOTES:
+// - Run "go test" to run tests
+// - Run "gocov test | gocov report" to report on test converage by file
+// - Run "gocov test | gocov annotate -" to report on all code and functions, those ,marked with "MISS" were never called
+
 type I interface {
 	Foo() string
 }
@@ -137,6 +143,26 @@ func isEqualFunc(val interface{}, current interface{}, field interface{}, param
 	return current.(string) == field.(string)
 }
 
+func (ms *MySuite) TestBase64Validation(c *C) {
+
+	s := "dW5pY29ybg=="
+
+	err := validate.Field(s, "base64")
+	c.Assert(err, IsNil)
+
+	s = "dGhpIGlzIGEgdGVzdCBiYXNlNjQ="
+	err = validate.Field(s, "base64")
+	c.Assert(err, IsNil)
+
+	s = ""
+	err = validate.Field(s, "base64")
+	c.Assert(err, NotNil)
+
+	s = "dW5pY29ybg== foo bar"
+	err = validate.Field(s, "base64")
+	c.Assert(err, NotNil)
+}
+
 func (ms *MySuite) TestStructOnlyValidation(c *C) {
 
 	type Inner struct {