英文:
Comparing errors in golang
问题
我正在使用golang编写一个基本的密码认证系统。
我使用bcrypt来对密码进行哈希处理，并将哈希保存在数据库中。
以下是从数据库中检索经过身份验证的帐户的函数。
func FindAccount(db *gorp.DbMap, email, password string) (*Account, error) {
account, err := FindByEmail(db, email)
if err != nil {
return nil, err
}
if account == nil {
return nil, nil
}
if err := bcrypt.CompareHashAndPassword([]byte(account.HashedPassword), []byte(password)); err != nil {
return nil, err
}
return account, nil
}
调用者代码如下：
account, err := FindAccount(db, email, password)
if err != nil {
if err == bcrypt.ErrMismatchedHashAndPassword {
log.Printf("为什么这个条件不匹配？")
return nil, EmailPasswordInvalidError{}
}
log.Printf("bcrypt.Err: %p, %#v", bcrypt.ErrMismatchedHashAndPassword, bcrypt.ErrMismatchedHashAndPassword)
log.Printf("err : %p, %#v", err, err)
return nil, err
}
当我使用这段代码并提供无效的电子邮件和密码时，会发生以下情况：
sessions.go:51: bcrypt.Err: 0xc2080290b0, &errors.errorString{s:"crypto/bcrypt: hashedPassword is not the hash of the given password"}
sessions.go:52: err : 0xc2080291e0, &errors.errorString{s:"crypto/bcrypt: hashedPassword is not the hash of the given password"}
为什么指针地址不同？
我们不能只比较错误吗？
英文:
I'm writing a basic password authentication system in golang.
I use bcrypt to hash the password and save the hash in a database.
Here's the function to retrieve an authenticated account from the database.
func FindAccount(db *gorp.DbMap, email, password string) (*Account, error) {
account, err := FindByEmail(db, email)
if err != nil {
return nil, err
}
if account == nil {
return nil, nil
}
if err := bcrypt.CompareHashAndPassword([]byte(account.HashedPassword), []byte(password)); err != nil {
return nil, err
}
return account, nil
}
And the caller:
account, err := FindAccount(db, email, password)
if err != nil {
if err == bcrypt.ErrMismatchedHashAndPassword {
log.Printf("Why doesn't this condition match?")
return nil, EmailPasswordInvalidError{}
}
log.Printf("bcrypt.Err: %p, %#v", bcrypt.ErrMismatchedHashAndPassword, bcrypt.ErrMismatchedHashAndPassword)
log.Printf("err : %p, %#v", err, err)
return nil, err
}
And when I use this code and provide invalid email and password, here's what happens:
sessions.go:51: bcrypt.Err: 0xc2080290b0, &errors.errorString{s:"crypto/bcrypt: hashedPassword is not the hash of the given password"}
sessions.go:52: err : 0xc2080291e0, &errors.errorString{s:"crypto/bcrypt: hashedPassword is not the hash of the given password"}
Why is the pointer address different?
Can't we just compare errors?
答案1
得分: 4
我导入了两个bcrypt包。
导入了"code.google.com/p/go.crypto/bcrypt"的文件中有FindAccount，而调用者导入了"golang.org/x/crypto/bcrypt"。
因此，有多个
var ErrMismatchedHashAndPassword = errors.New("crypto/bcrypt: hashedPassword is not the hash of the given password")
具有不同的指针。
将所有的"code.google.com/p/go.crypto/bcrypt"替换为"golang.org/x/crypto/bcrypt"解决了这个问题。
英文:
I had two bcrypt packages imported..
The file which has FindAccount imported "code.google.com/p/go.crypto/bcrypt", and the caller imported "golang.org/x/crypto/bcrypt".
Thus there were multiple
var ErrMismatchedHashAndPassword = errors.New("crypto/bcrypt: hashedPassword is not the hash of the given password")
with different pointers.
Replacing all "code.google.com/p/go.crypto/bcrypt" with "golang.org/x/crypto/bcrypt" fixed the issue.
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