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package validators
import (
"bytes"
"context"
"fmt"
"io"
"mime/multipart"
"net/url"
"strings"
"time"
"github.com/xuri/excelize/v2"
"github.com/NdoleStudio/httpsms/pkg/cache"
"github.com/NdoleStudio/httpsms/pkg/entities"
"github.com/NdoleStudio/httpsms/pkg/repositories"
"github.com/NdoleStudio/httpsms/pkg/requests"
"github.com/NdoleStudio/httpsms/pkg/services"
"github.com/NdoleStudio/httpsms/pkg/telemetry"
"github.com/dustin/go-humanize"
"github.com/jszwec/csvutil"
"github.com/nyaruka/phonenumbers"
"github.com/palantir/stacktrace"
)
// BulkMessageHandlerValidator validates models used in handlers.BillingHandler
type BulkMessageHandlerValidator struct {
validator
phoneService *services.PhoneService
userService *services.UserService
logger telemetry.Logger
tracer telemetry.Tracer
cache cache.Cache
}
// NewBulkMessageHandlerValidator creates a new handlers.BulkMessageHandlerValidator validator
func NewBulkMessageHandlerValidator(
logger telemetry.Logger,
tracer telemetry.Tracer,
phoneService *services.PhoneService,
userService *services.UserService,
appCache cache.Cache,
) (v *BulkMessageHandlerValidator) {
return &BulkMessageHandlerValidator{
logger: logger.WithService(fmt.Sprintf("%T", v)),
tracer: tracer,
userService: userService,
phoneService: phoneService,
cache: appCache,
}
}
// ValidateStore validates the requests.BillingUsageHistory request
func (v *BulkMessageHandlerValidator) ValidateStore(ctx context.Context, userID entities.UserID, header *multipart.FileHeader) ([]*requests.BulkMessage, url.Values) {
ctx, span, ctxLogger := v.tracer.StartWithLogger(ctx, v.logger)
defer span.End()
user, err := v.userService.GetByID(ctx, userID)
if err != nil {
result := url.Values{}
result.Add("document", "Cannot load your account. Please try again later or contact support.")
ctxLogger.Error(v.tracer.WrapErrorSpan(span, stacktrace.Propagate(err, fmt.Sprintf("cannot load user [%s]", userID))))
return nil, result
}
messages, result := v.parseFile(ctxLogger, user, header)
if len(result) != 0 {
return messages, result
}
if len(messages) == 0 {
result.Add("document", "The uploaded file doesn't contain any valid records. Make sure you are using the official httpSMS template.")
return messages, result
}
if len(messages) > 1000 {
result.Add("document", "The uploaded file must contain less than 1000 records.")
return messages, result
}
for index, message := range messages {
messages[index] = message.Sanitize()
}
result = v.validateMessages(ctx, messages)
if len(result) != 0 {
return messages, result
}
result = v.validateOwners(ctx, userID, messages)
if len(result) != 0 {
return messages, result
}
return messages, result
}
func (v *BulkMessageHandlerValidator) parseFile(ctxLogger telemetry.Logger, user *entities.User, header *multipart.FileHeader) ([]*requests.BulkMessage, url.Values) {
if header.Header.Get("Content-Type") == "text/csv" || strings.HasSuffix(header.Filename, ".csv") {
return v.parseCSV(ctxLogger, user, header)
}
if header.Header.Get("Content-Type") == "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" || strings.HasSuffix(header.Filename, ".xlsx") {
return v.parseXlsx(ctxLogger, user, header)
}
ctxLogger.Error(stacktrace.NewError(fmt.Sprintf("cannot parse file [%s] for user [%s] with content type [%s]", header.Filename, user.ID, header.Header.Get("Content-Type"))))
result := url.Values{}
result.Add("document", fmt.Sprintf("The file [%s] is not a valid CSV or Excel file.", header.Filename))
return nil, result
}
func (v *BulkMessageHandlerValidator) parseXlsx(ctxLogger telemetry.Logger, user *entities.User, header *multipart.FileHeader) ([]*requests.BulkMessage, url.Values) {
content, result := v.parseBytes(ctxLogger, user.ID, header)
if len(result) != 0 {
return nil, result
}
excel, err := excelize.OpenReader(bytes.NewReader(content))
if err != nil {
ctxLogger.Error(stacktrace.Propagate(err, fmt.Sprintf("cannot generate excel file from [%s] for user [%s]", header.Filename, user.ID)))
result.Add("document", fmt.Sprintf("Cannot parse the uploaded excel file with name [%s].", header.Filename))
return nil, result
}
defer excel.Close()
rows, err := excel.GetRows(excel.GetSheetName(0))
if err != nil {
ctxLogger.Error(stacktrace.Propagate(err, fmt.Sprintf("cannot get rows from excel file [%s] for user [%s]", header.Filename, user.ID)))
result.Add("document", fmt.Sprintf("Cannot parse the uploaded excel file with name [%s].", header.Filename))
return nil, result
}
var messages []*requests.BulkMessage
for index, row := range rows {
if len(row) < 3 || strings.TrimSpace(row[0]) == "" || index == 0 {
continue
}
var sendAt *time.Time
if len(row) > 3 && strings.TrimSpace(row[3]) != "" {
ctxLogger.Info(fmt.Sprintf("excel time = [%s]", row[3]))
sendAt, err = v.convertExcelTime(user, row[3])
if err != nil {
result.Add("document", fmt.Sprintf("Row [%d]: The SendTime [%s] is not in the correct format e.g [2006-01-02T15:04:05] where 2006 is the year, 01 is January, 02 is the second day of the month and the time is 15:04:05", index+1, row[3]))
return nil, result
}
}
var attachmentURLs string
if len(row) > 4 && strings.TrimSpace(row[4]) != "" {
attachmentURLs = strings.TrimSpace(row[4])
}
messages = append(messages, &requests.BulkMessage{
FromPhoneNumber: strings.TrimSpace(row[0]),
ToPhoneNumber: strings.TrimSpace(row[1]),
Content: row[2],
SendTime: sendAt,
AttachmentURLs: attachmentURLs,
})
}
return messages, url.Values{}
}
func (v *BulkMessageHandlerValidator) convertExcelTime(user *entities.User, value string) (*time.Time, error) {
t, err := time.ParseInLocation("2006-01-02T15:04:05", value, user.Location())
if err != nil {
return nil, stacktrace.Propagate(err, fmt.Sprintf("cannot parse excel time [%s] as [%T]", value, t))
}
return &t, nil
}
func (v *BulkMessageHandlerValidator) parseBytes(ctxLogger telemetry.Logger, userID entities.UserID, header *multipart.FileHeader) ([]byte, url.Values) {
result := url.Values{}
if header.Size >= 5000000 {
result.Add("document", fmt.Sprintf("The CSV file must be less than 500 KB the file you uploaded is [%s].", humanize.Bytes(uint64(header.Size))))
return nil, result
}
file, err := header.Open()
if err != nil {
ctxLogger.Error(stacktrace.Propagate(err, fmt.Sprintf("cannot open file [%s] for reading for user [%s]", header.Filename, userID)))
result.Add("document", fmt.Sprintf("Cannot open the uploaded file with name [%s].", header.Filename))
return nil, result
}
defer func() {
if e := file.Close(); e != nil {
ctxLogger.Error(stacktrace.Propagate(e, fmt.Sprintf("cannot close file [%s] for user [%s]", header.Filename, userID)))
}
}()
b := new(bytes.Buffer)
if _, err = io.Copy(b, file); err != nil {
ctxLogger.Error(stacktrace.Propagate(err, fmt.Sprintf("cannot copy file [%s] to buffer for user [%s]", header.Filename, userID)))
result.Add("document", fmt.Sprintf("Cannot read the conents of the uploaded file [%s].", header.Filename))
return nil, result
}
return b.Bytes(), result
}
func (v *BulkMessageHandlerValidator) parseCSV(ctxLogger telemetry.Logger, user *entities.User, header *multipart.FileHeader) ([]*requests.BulkMessage, url.Values) {
content, result := v.parseBytes(ctxLogger, user.ID, header)
if len(result) != 0 {
return nil, result
}
var messages []*requests.BulkMessage
if err := csvutil.Unmarshal(content, &messages); err != nil {
ctxLogger.Error(stacktrace.Propagate(err, fmt.Sprintf("cannot unmarshall contents [%s] into type [%T] for file [%s] and user [%s]", content, messages, header.Filename, user.ID)))
result.Add("document", fmt.Sprintf("Cannot read the contents of the uploaded file [%s].", header.Filename))
return nil, result
}
return messages, url.Values{}
}
func (v *BulkMessageHandlerValidator) validateMessages(_ context.Context, messages []*requests.BulkMessage) url.Values {
result := url.Values{}
for index, message := range messages {
if message.AttachmentURLs != "" {
urls := strings.Split(message.AttachmentURLs, ",")
validAttachmentCount := 0
for _, u := range urls {
if strings.TrimSpace(u) != "" {
validAttachmentCount++
}
}
if validAttachmentCount > 10 {
result.Add("document", fmt.Sprintf("Row [%d]: You cannot attach more than 10 files per message.", index+2))
}
for _, u := range urls {
cleanURL := strings.TrimSpace(u)
if cleanURL == "" {
continue
}
parsedURL, err := url.ParseRequestURI(cleanURL)
if err != nil || parsedURL.Scheme == "" || parsedURL.Host == "" {
result.Add("document", fmt.Sprintf("Row [%d]: The attachment URL [%s] has an invalid url format.", index+2, cleanURL))
} else if parsedURL.Scheme != "http" && parsedURL.Scheme != "https" {
result.Add("document", fmt.Sprintf("Row [%d]: The attachment URL [%s] must use http or https.", index+2, cleanURL))
}
}
}
if _, err := phonenumbers.Parse(message.FromPhoneNumber, phonenumbers.UNKNOWN_REGION); err != nil {
result.Add("document", fmt.Sprintf("Row [%d]: The FromPhoneNumber [%s] is not a valid E.164 phone number", index+2, message.FromPhoneNumber))
}
if _, err := phonenumbers.Parse(message.ToPhoneNumber, phonenumbers.UNKNOWN_REGION); err != nil {
result.Add("document", fmt.Sprintf("Row [%d]: The ToPhoneNumber [%s] is not a valid E.164 phone number", index+2, message.ToPhoneNumber))
}
if len(message.Content) > 1024 {
result.Add("document", fmt.Sprintf("Row [%d]: The message content must be less than 1024 characters.", index+2))
}
if message.SendTime != nil && message.SendTime.After(time.Now().Add(420*time.Hour)) {
result.Add("document", fmt.Sprintf("Row [%d]: The SendTime [%s] cannot be more than 20 days (420 hours) in the future.", index+2, message.SendTime.Format(time.RFC3339)))
}
}
return result
}
func (v *BulkMessageHandlerValidator) validateOwners(ctx context.Context, userID entities.UserID, messages []*requests.BulkMessage) url.Values {
numbers := map[string][]int{}
for index, message := range messages {
numbers[message.FromPhoneNumber] = append(numbers[message.FromPhoneNumber], index+2)
}
result := url.Values{}
for number, rows := range numbers {
_, err := v.phoneService.Load(ctx, userID, strings.TrimSpace(number))
if stacktrace.GetCode(err) == repositories.ErrCodeNotFound {
result.Add("document", fmt.Sprintf("Rows [%s]: The FromPhoneNumber [%s] is not registered on your account", v.toString(rows), number))
}
}
return result
}
func (v *BulkMessageHandlerValidator) toString(value []int) string {
result := strings.Builder{}
for index, row := range value {
if index != 0 {
result.WriteString(", ")
}
result.WriteString(fmt.Sprintf("%d", row))
}
return result.String()
}