36 lines
716 B
Go
36 lines
716 B
Go
package shortener
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import (
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"crypto/sha256"
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"fmt"
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"math/big"
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"github.com/itchyny/base58-go"
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)
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func sha256Of(input string) []byte {
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algorithm := sha256.New()
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algorithm.Write([]byte(input))
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return algorithm.Sum(nil)
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}
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func base58Encoded(bytes []byte) (string, error) {
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encoded, err := base58.BitcoinEncoding.Encode(bytes)
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if err != nil {
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return "", err
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}
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return string(encoded), nil
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}
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func GenerateShortLink(originUrl string, userId string) (string, error) {
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urlHashByte := sha256Of(originUrl + userId)
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generateNumber := new(big.Int).SetBytes(urlHashByte).Uint64()
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result, err := base58Encoded([]byte(fmt.Sprintf("%d", generateNumber)))
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if err != nil {
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return "", err
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}
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return result, nil
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}
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