chore: import upstream snapshot with attribution

internal/repo/export/email_repo.go

@@ -0,0 +1,99 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package export
+
+import (
+	"context"
+	"time"
+
+	"github.com/apache/answer/internal/base/constant"
+	"github.com/tidwall/gjson"
+
+	"github.com/apache/answer/internal/base/data"
+	"github.com/apache/answer/internal/base/reason"
+	"github.com/apache/answer/internal/service/export"
+	"github.com/segmentfault/pacman/errors"
+)
+
+// emailRepo email repository
+type emailRepo struct {
+	data *data.Data
+}
+
+// NewEmailRepo new repository
+func NewEmailRepo(data *data.Data) export.EmailRepo {
+	return &emailRepo{
+		data: data,
+	}
+}
+
+// SetCode The email code is used to verify that the link in the message is out of date
+func (e *emailRepo) SetCode(ctx context.Context, userID, code, content string, duration time.Duration) error {
+	// Setting the latest code is to help ensure that only one link is active at a time.
+	// Set userID -> latest code
+	if err := e.data.Cache.SetString(ctx, constant.UserLatestEmailCodeCacheKey+userID, code, duration); err != nil {
+		return errors.InternalServer(reason.DatabaseError).WithError(err).WithStack()
+	}
+
+	// Set latest code -> content
+	if err := e.data.Cache.SetString(ctx, constant.UserEmailCodeCacheKey+code, content, duration); err != nil {
+		return errors.InternalServer(reason.DatabaseError).WithError(err).WithStack()
+	}
+	return nil
+}
+
+// VerifyCode verify the code if out of date
+func (e *emailRepo) VerifyCode(ctx context.Context, code string) (content string, err error) {
+	// Get latest code -> content
+	codeCacheKey := constant.UserEmailCodeCacheKey + code
+	content, exist, err := e.data.Cache.GetString(ctx, codeCacheKey)
+	if err != nil {
+		return "", err
+	}
+	if !exist {
+		return "", nil
+	}
+
+	// Delete the code after verification
+	_ = e.data.Cache.Del(ctx, codeCacheKey)
+
+	// If some email content does not need to verify the latest code is the same as the code, skip it.
+	// For example, some unsubscribe email content does not need to verify the latest code.
+	// This link always works before the code is out of date.
+	if skipValidationLatestCode := gjson.Get(content, "skip_validation_latest_code").Bool(); skipValidationLatestCode {
+		return content, nil
+	}
+	userID := gjson.Get(content, "user_id").String()
+
+	// Get userID -> latest code
+	latestCode, exist, err := e.data.Cache.GetString(ctx, constant.UserLatestEmailCodeCacheKey+userID)
+	if err != nil {
+		return "", err
+	}
+	if !exist {
+		return "", nil
+	}
+
+	// Check if the latest code is the same as the code, if not, means the code is out of date
+	if latestCode != code {
+		return "", nil
+	}
+	return content, nil
+}