From f9a928c1817e8598fcb1abe76723b3ab96844f5e Mon Sep 17 00:00:00 2001
From: xdrm-brackets <xdrm.brackets.dev@gmail.com>
Date: Tue, 2 Oct 2018 11:34:58 +0200
Subject: [PATCH] add 'digest(length)' type checker + minfix import in cmd/main

---
 cmd/aicra/main.go                       |  1 -
 internal/checker/default/digest/main.go | 73 +++++++++++++++++++++++++
 2 files changed, 73 insertions(+), 1 deletion(-)
 create mode 100644 internal/checker/default/digest/main.go

diff --git a/cmd/aicra/main.go b/cmd/aicra/main.go
index 32e8da5..02d42b6 100644
--- a/cmd/aicra/main.go
+++ b/cmd/aicra/main.go
@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"git.xdrm.io/go/aicra/driver"
 	"git.xdrm.io/go/aicra/internal/clifmt"
 	"git.xdrm.io/go/aicra/internal/config"
 	"os"
diff --git a/internal/checker/default/digest/main.go b/internal/checker/default/digest/main.go
new file mode 100644
index 0000000..14b6c45
--- /dev/null
+++ b/internal/checker/default/digest/main.go
@@ -0,0 +1,73 @@
+package main
+
+import (
+	"git.xdrm.io/go/aicra/driver"
+	"strconv"
+	"strings"
+)
+
+func main()                  {}
+func Export() driver.Checker { return new(DigestChecker) }
+
+type DigestChecker struct {
+	Length *uint64
+}
+
+// Match filters the parameter type format "varchar(min, max)"
+func (dck *DigestChecker) Match(name string) bool {
+
+	dck.Length = nil
+
+	/* (1) Check prefix/suffix */
+	if len(name) < len("digest(x)") || !strings.HasPrefix(name, "digest(") || name[len(name)-1] != ')' {
+		return false
+	}
+
+	/* (2) Extract length */
+	lengthStr := name[len("digest(") : len(name)-1]
+
+	length, err := strconv.ParseUint(lengthStr, 10, 64)
+	if err != nil {
+		return false
+	}
+	dck.Length = &length
+
+	return true
+
+}
+
+// Check whether the given value fulfills the condition (min, max)
+func (dck *DigestChecker) Check(value interface{}) bool {
+
+	/* (1) Check if sizes set */
+	if dck.Length == nil {
+		return false
+	}
+
+	/* (2) Check if string */
+	strval, ok := value.(string)
+	if !ok {
+		return false
+	}
+
+	length := uint64(len(strval))
+
+	/* (3) Check length */
+	if length != *dck.Length {
+		return false
+	}
+
+	/* (4) Check character set */
+	for _, char := range strval {
+		if !isValidCharacter(char) {
+			return false
+		}
+	}
+
+	return true
+
+}
+
+func isValidCharacter(char rune) bool {
+	return (char >= '0' && char <= '9') || (char >= 'a' && char <= 'f')
+}