Move keys to models/asymkey (#17917)

* Move keys to models/keys

* Rename models/keys -> models/asymkey

* change the missed package name

* Fix package alias

* Fix test

* Fix docs

* Fix test

* Fix test

* merge

models/asymkey/gpg_key_add.go

@@ -0,0 +1,167 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package asymkey
+
+import (
+	"strings"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/modules/log"
+
+	"github.com/keybase/go-crypto/openpgp"
+)
+
+//   __________________  ________   ____  __.
+//  /  _____/\______   \/  _____/  |    |/ _|____ ___.__.
+// /   \  ___ |     ___/   \  ___  |      <_/ __ <   |  |
+// \    \_\  \|    |   \    \_\  \ |    |  \  ___/\___  |
+//  \______  /|____|    \______  / |____|__ \___  > ____|
+//         \/                  \/          \/   \/\/
+//    _____       .___  .___
+//   /  _  \    __| _/__| _/
+//	/  /_\  \  / __ |/ __ |
+// /    |    \/ /_/ / /_/ |
+// \____|__  /\____ \____ |
+//         \/      \/    \/
+
+// This file contains functions relating to adding GPG Keys
+
+// addGPGKey add key, import and subkeys to database
+func addGPGKey(e db.Engine, key *GPGKey, content string) (err error) {
+	// Add GPGKeyImport
+	if _, err = e.Insert(GPGKeyImport{
+		KeyID:   key.KeyID,
+		Content: content,
+	}); err != nil {
+		return err
+	}
+	// Save GPG primary key.
+	if _, err = e.Insert(key); err != nil {
+		return err
+	}
+	// Save GPG subs key.
+	for _, subkey := range key.SubsKey {
+		if err := addGPGSubKey(e, subkey); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// addGPGSubKey add subkeys to database
+func addGPGSubKey(e db.Engine, key *GPGKey) (err error) {
+	// Save GPG primary key.
+	if _, err = e.Insert(key); err != nil {
+		return err
+	}
+	// Save GPG subs key.
+	for _, subkey := range key.SubsKey {
+		if err := addGPGSubKey(e, subkey); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// AddGPGKey adds new public key to database.
+func AddGPGKey(ownerID int64, content, token, signature string) ([]*GPGKey, error) {
+	ekeys, err := checkArmoredGPGKeyString(content)
+	if err != nil {
+		return nil, err
+	}
+
+	ctx, committer, err := db.TxContext()
+	if err != nil {
+		return nil, err
+	}
+	defer committer.Close()
+
+	keys := make([]*GPGKey, 0, len(ekeys))
+
+	verified := false
+	// Handle provided signature
+	if signature != "" {
+		signer, err := openpgp.CheckArmoredDetachedSignature(ekeys, strings.NewReader(token), strings.NewReader(signature))
+		if err != nil {
+			signer, err = openpgp.CheckArmoredDetachedSignature(ekeys, strings.NewReader(token+"\n"), strings.NewReader(signature))
+		}
+		if err != nil {
+			signer, err = openpgp.CheckArmoredDetachedSignature(ekeys, strings.NewReader(token+"\r\n"), strings.NewReader(signature))
+		}
+		if err != nil {
+			log.Error("Unable to validate token signature. Error: %v", err)
+			return nil, ErrGPGInvalidTokenSignature{
+				ID:      ekeys[0].PrimaryKey.KeyIdString(),
+				Wrapped: err,
+			}
+		}
+		ekeys = []*openpgp.Entity{signer}
+		verified = true
+	}
+
+	if len(ekeys) > 1 {
+		id2key := map[string]*openpgp.Entity{}
+		newEKeys := make([]*openpgp.Entity, 0, len(ekeys))
+		for _, ekey := range ekeys {
+			id := ekey.PrimaryKey.KeyIdString()
+			if original, has := id2key[id]; has {
+				// Coalesce this with the other one
+				for _, subkey := range ekey.Subkeys {
+					if subkey.PublicKey == nil {
+						continue
+					}
+					found := false
+
+					for _, originalSubkey := range original.Subkeys {
+						if originalSubkey.PublicKey == nil {
+							continue
+						}
+						if originalSubkey.PublicKey.KeyId == subkey.PublicKey.KeyId {
+							found = true
+							break
+						}
+					}
+					if !found {
+						original.Subkeys = append(original.Subkeys, subkey)
+					}
+				}
+				for name, identity := range ekey.Identities {
+					if _, has := original.Identities[name]; has {
+						continue
+					}
+					original.Identities[name] = identity
+				}
+				continue
+			}
+			id2key[id] = ekey
+			newEKeys = append(newEKeys, ekey)
+		}
+		ekeys = newEKeys
+	}
+
+	for _, ekey := range ekeys {
+		// Key ID cannot be duplicated.
+		has, err := db.GetEngine(ctx).Where("key_id=?", ekey.PrimaryKey.KeyIdString()).
+			Get(new(GPGKey))
+		if err != nil {
+			return nil, err
+		} else if has {
+			return nil, ErrGPGKeyIDAlreadyUsed{ekey.PrimaryKey.KeyIdString()}
+		}
+
+		// Get DB session
+
+		key, err := parseGPGKey(ownerID, ekey, verified)
+		if err != nil {
+			return nil, err
+		}
+
+		if err = addGPGKey(db.GetEngine(ctx), key, content); err != nil {
+			return nil, err
+		}
+		keys = append(keys, key)
+	}
+	return keys, committer.Commit()
+}