55 lines
1.1 KiB
Go
55 lines
1.1 KiB
Go
package bank_card
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// IsValidLuhn 使用Luhn算法校验银行卡号码
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// @see https://en.wikipedia.org/wiki/Luhn_algorithm
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// @see https://www.geeksforgeeks.org/luhn-algorithm/
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// @see https://medium.com/@akshaymohite/luhns-algorithm-to-validate-credit-debit-card-numbers-1952e6c7a9d0
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// @see https://www.woshipm.com/pd/371041.html
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func IsValidLuhn(cardNo string) bool {
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length := len(cardNo)
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if length == 0 {
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return false
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}
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if !isNumberString(cardNo) {
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return false
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}
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sum := 0
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second := false
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for i := length - 1; i >= 0; i-- {
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d := cardNo[i] - '0'
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if second == true {
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d = d * 2
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}
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sum += int(d) / 10
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sum += int(d) % 10
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second = !second
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}
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return sum%10 == 0
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}
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// IsValidBankCardNo 是否合法的银行卡号
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func IsValidBankCardNo(cardNo string) bool {
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length := len(cardNo)
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if length < 12 || length > 19 {
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return false
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}
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return IsValidLuhn(cardNo)
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}
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// isNumberString 验证字符是数字
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func isNumberString(s string) bool {
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length := len(s)
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for i := 0; i < length; i++ {
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if s[i] < '0' || s[i] > '9' {
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return false
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}
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}
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return true
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}
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