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package database
import (
"encoding/json"
"fmt"
"io"
"net/http"
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"github.com/aerogo/aero"
"github.com/aerogo/api"
"github.com/akyoto/stringutils/unsafe"
"github.com/animenotifier/notify.moe/arn"
"github.com/mohae/deepcopy"
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)
// Download downloads a snapshot of a database collection.
func Download(ctx aero.Context) error {
typ := ctx.Get("type")
if !arn.DB.HasType(typ) {
return ctx.Error(http.StatusNotFound, "Type doesn't exist")
}
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if arn.IsPrivateType(typ) {
return ctx.Error(http.StatusUnauthorized, "Type is private and can not be downloaded")
}
// Send headers necessary for file downloads
ctx.Response().SetHeader("Content-Disposition", fmt.Sprintf(`attachment; filename="%s.dat"`, typ))
// Stream data
reader, writer := io.Pipe()
encoder := json.NewEncoder(writer)
go func() {
for object := range arn.DB.All(typ) {
idObject, hasID := object.(arn.Identifiable)
if !hasID {
continue
}
// Filter out private data
filter, isFilter := object.(api.Filter)
if isFilter && filter.ShouldFilter(ctx) {
object = deepcopy.Copy(object)
filter = object.(api.Filter)
filter.Filter()
}
// Write ID
_, err := writer.Write(unsafe.StringToBytes(idObject.GetID()))
if err != nil {
_ = writer.CloseWithError(err)
return
}
// Write newline
_, err = writer.Write([]byte("\n"))
if err != nil {
_ = writer.CloseWithError(err)
return
}
// Write JSON (newline included)
err = encoder.Encode(object)
if err != nil {
_ = writer.CloseWithError(err)
return
}
}
writer.Close()
}()
return ctx.Reader(reader)
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}