45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
package login
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/hex"
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"errors"
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"net/url"
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"strconv"
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)
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// ErrUserNotDefined describes error of an unassigned structure of user
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var ErrUserNotDefined = errors.New("user is not defined")
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// CheckAuthorization verify the authentication and the integrity of the data
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// received by comparing the received hash parameter with the hexadecimal
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// representation of the HMAC-SHA-256 signature of the data-check-string with the
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// SHA256 hash of the bot's token used as a secret key.
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func (app *App) CheckAuthorization(user *User) (bool, error) {
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if user == nil {
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return false, ErrUserNotDefined
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}
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dataCheck := make(url.Values)
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dataCheck.Add(KeyAuthDate, string(user.AuthDate))
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dataCheck.Add(KeyFirstName, user.FirstName)
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dataCheck.Add(KeyID, strconv.Itoa(user.ID))
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// Add optional values if exist
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if user.LastName != "" {
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dataCheck.Add(KeyLastName, user.LastName)
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}
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if user.PhotoURL != "" {
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dataCheck.Add(KeyPhotoURL, user.PhotoURL)
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}
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if user.Username != "" {
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dataCheck.Add(KeyUsername, user.Username)
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}
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secretKey := sha256.Sum256([]byte(app.SecretKey))
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hash := hmac.New(sha256.New, secretKey[0:])
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_, err := hash.Write([]byte(dataCheck.Encode()))
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return hex.EncodeToString(hash.Sum(nil)) == user.Hash, err
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}
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