Make CI use a dummy password hasher for all tests (#22983)

During the recent hash algorithm change it became clear that the choice
of password hash algorithm plays a role in the time taken for CI to run.

Therefore as attempt to improve CI we should consider using a dummy
hashing algorithm instead of a real hashing algorithm.

This PR creates a dummy algorithm which is then set as the default
hashing algorithm during tests that use the fixtures. This hopefully
will cause a reduction in the time it takes for CI to run.

---------

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

9 files changed, 84 insertions, 8 deletions

diff --git a/modules/auth/password/hash/argon2.go b/modules/auth/password/hash/argon2.go
index 14c16b53c..0cd6472fa 100644
--- a/modules/auth/password/hash/argon2.go
+++ b/modules/auth/password/hash/argon2.go
@@ -13,7 +13,7 @@ import (
 )
 
 func init() {
-	Register("argon2", NewArgon2Hasher)
+	MustRegister("argon2", NewArgon2Hasher)
 }
 
 // Argon2Hasher implements PasswordHasher
diff --git a/modules/auth/password/hash/bcrypt.go b/modules/auth/password/hash/bcrypt.go
index ddf542040..4607c169c 100644
--- a/modules/auth/password/hash/bcrypt.go
+++ b/modules/auth/password/hash/bcrypt.go
@@ -8,7 +8,7 @@ import (
 )
 
 func init() {
-	Register("bcrypt", NewBcryptHasher)
+	MustRegister("bcrypt", NewBcryptHasher)
 }
 
 // BcryptHasher implements PasswordHasher
diff --git a/modules/auth/password/hash/dummy.go b/modules/auth/password/hash/dummy.go
new file mode 100644
index 000000000..22f2e2f64
--- /dev/null
+++ b/modules/auth/password/hash/dummy.go
@@ -0,0 +1,33 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package hash
+
+import (
+	"encoding/hex"
+)
+
+// DummyHasher implements PasswordHasher and is a dummy hasher that simply
+// puts the password in place with its salt
+// This SHOULD NOT be used in production and is provided to make the integration
+// tests faster only
+type DummyHasher struct{}
+
+// HashWithSaltBytes a provided password and salt
+func (hasher *DummyHasher) HashWithSaltBytes(password string, salt []byte) string {
+	if hasher == nil {
+		return ""
+	}
+
+	if len(salt) == 10 {
+		return string(salt) + ":" + password
+	}
+
+	return hex.EncodeToString(salt) + ":" + password
+}
+
+// NewDummyHasher is a factory method to create a DummyHasher
+// Any provided configuration is ignored
+func NewDummyHasher(_ string) *DummyHasher {
+	return &DummyHasher{}
+}
diff --git a/modules/auth/password/hash/dummy_test.go b/modules/auth/password/hash/dummy_test.go
new file mode 100644
index 000000000..f3b36df62
--- /dev/null
+++ b/modules/auth/password/hash/dummy_test.go
@@ -0,0 +1,25 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package hash
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDummyHasher(t *testing.T) {
+	dummy := &PasswordHashAlgorithm{
+		PasswordSaltHasher: NewDummyHasher(""),
+		Specification:      "dummy",
+	}
+
+	password, salt := "password", "ZogKvWdyEx"
+
+	hash, err := dummy.Hash(password, salt)
+	assert.Nil(t, err)
+	assert.Equal(t, hash, salt+":"+password)
+
+	assert.True(t, dummy.VerifyPassword(password, hash, salt))
+}
diff --git a/modules/auth/password/hash/hash.go b/modules/auth/password/hash/hash.go
index 3572dd46d..459320e1b 100644
--- a/modules/auth/password/hash/hash.go
+++ b/modules/auth/password/hash/hash.go
@@ -83,17 +83,26 @@ var (
 	availableHasherFactories = map[string]func(string) PasswordSaltHasher{}
 )
 
+// MustRegister registers a PasswordSaltHasher with the availableHasherFactories
+// Caution: This is not thread safe.
+func MustRegister[T PasswordSaltHasher](name string, newFn func(config string) T) {
+	if err := Register(name, newFn); err != nil {
+		panic(err)
+	}
+}
+
 // Register registers a PasswordSaltHasher with the availableHasherFactories
 // Caution: This is not thread safe.
-func Register[T PasswordSaltHasher](name string, newFn func(config string) T) {
+func Register[T PasswordSaltHasher](name string, newFn func(config string) T) error {
 	if _, has := availableHasherFactories[name]; has {
-		panic(fmt.Errorf("duplicate registration of password salt hasher: %s", name))
+		return fmt.Errorf("duplicate registration of password salt hasher: %s", name)
 	}
 
 	availableHasherFactories[name] = func(config string) PasswordSaltHasher {
 		n := newFn(config)
 		return n
 	}
+	return nil
 }
 
 // In early versions of gitea the password hash algorithm field of a user could be
diff --git a/modules/auth/password/hash/hash_test.go b/modules/auth/password/hash/hash_test.go
index 593c8386a..7aa051733 100644
--- a/modules/auth/password/hash/hash_test.go
+++ b/modules/auth/password/hash/hash_test.go
@@ -19,16 +19,20 @@ func (t testSaltHasher) HashWithSaltBytes(password string, salt []byte) string {
 }
 
 func Test_registerHasher(t *testing.T) {
-	Register("Test_registerHasher", func(config string) testSaltHasher {
+	MustRegister("Test_registerHasher", func(config string) testSaltHasher {
 		return testSaltHasher(config)
 	})
 
 	assert.Panics(t, func() {
-		Register("Test_registerHasher", func(config string) testSaltHasher {
+		MustRegister("Test_registerHasher", func(config string) testSaltHasher {
 			return testSaltHasher(config)
 		})
 	})
 
+	assert.Error(t, Register("Test_registerHasher", func(config string) testSaltHasher {
+		return testSaltHasher(config)
+	}))
+
 	assert.Equal(t, "password$salt$",
 		Parse("Test_registerHasher").PasswordSaltHasher.HashWithSaltBytes("password", []byte("salt")))
 
diff --git a/modules/auth/password/hash/pbkdf2.go b/modules/auth/password/hash/pbkdf2.go
index be3121318..27382fedb 100644
--- a/modules/auth/password/hash/pbkdf2.go
+++ b/modules/auth/password/hash/pbkdf2.go
@@ -14,7 +14,7 @@ import (
 )
 
 func init() {
-	Register("pbkdf2", NewPBKDF2Hasher)
+	MustRegister("pbkdf2", NewPBKDF2Hasher)
 }
 
 // PBKDF2Hasher implements PasswordHasher
diff --git a/modules/auth/password/hash/scrypt.go b/modules/auth/password/hash/scrypt.go
index e77434fc3..f3d38f751 100644
--- a/modules/auth/password/hash/scrypt.go
+++ b/modules/auth/password/hash/scrypt.go
@@ -13,7 +13,7 @@ import (
 )
 
 func init() {
-	Register("scrypt", NewScryptHasher)
+	MustRegister("scrypt", NewScryptHasher)
 }
 
 // ScryptHasher implements PasswordHasher
diff --git a/modules/setting/setting.go b/modules/setting/setting.go
index 83ebde947..87b1e2797 100644
--- a/modules/setting/setting.go
+++ b/modules/setting/setting.go
@@ -16,6 +16,7 @@ import (
 	"strings"
 	"time"
 
+	"code.gitea.io/gitea/modules/auth/password/hash"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/user"
 	"code.gitea.io/gitea/modules/util"
@@ -232,6 +233,10 @@ func InitProviderAndLoadCommonSettingsForTest(extraConfigs ...string) {
 	if err := PrepareAppDataPath(); err != nil {
 		log.Fatal("Can not prepare APP_DATA_PATH: %v", err)
 	}
+	// register the dummy hash algorithm function used in the test fixtures
+	_ = hash.Register("dummy", hash.NewDummyHasher)
+
+	PasswordHashAlgo, _ = hash.SetDefaultPasswordHashAlgorithm("dummy")
 }
 
 // newFileProviderFromConf initializes configuration context.