55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
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package sha256
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import (
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"crypto/sha256"
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"fmt"
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"sort"
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"strings"
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"git.andreafazzi.eu/andrea/probo/client"
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"git.andreafazzi.eu/andrea/probo/hasher"
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)
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var DefaultSHA256HashingFn = func(text string) string {
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return fmt.Sprintf("%x", sha256.Sum256([]byte(text)))
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}
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type Default256Hasher struct {
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hashFn hasher.HashFunc
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}
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func NewDefault256Hasher(hashFn hasher.HashFunc) *Default256Hasher {
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return &Default256Hasher{hashFn}
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}
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func (h *Default256Hasher) QuizHashes(quiz *client.CreateQuizRequest) []string {
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result := make([]string, 0)
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result = append(result, h.QuestionHash(quiz.Question))
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for _, a := range quiz.Answers {
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result = append(result, h.AnswerHash(a))
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}
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result = append(result, h.Calculate(result))
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return result
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}
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func (h *Default256Hasher) QuestionHash(question *client.CreateQuestionRequest) string {
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return h.hashFn(question.Text)
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}
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func (h *Default256Hasher) AnswerHash(answer *client.CreateAnswerRequest) string {
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return h.hashFn(answer.Text)
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}
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func (h *Default256Hasher) Calculate(hashes []string) string {
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orderedHashes := make([]string, len(hashes))
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copy(orderedHashes, hashes)
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sort.Strings(orderedHashes)
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return h.hashFn(strings.Join(orderedHashes, ""))
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}
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