Add mailer file utilities

platform/file/mailer.go

@@ -0,0 +1,32 @@
+package file
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/rs/zerolog/log"
+)
+
+func MailerFromReader(public_id string, body io.Reader) error {
+	filepath := MailerPath(public_id)
+
+	// Create file in configured directory
+	dst, err := os.Create(filepath)
+	if err != nil {
+		return fmt.Errorf("Failed to create image file %s: %w", filepath, err)
+	}
+	defer dst.Close()
+
+	// Copy rest of request body to file
+	_, err = io.Copy(dst, body)
+	if err != nil {
+		return fmt.Errorf("Unable to save file %s: %w", filepath, err)
+	}
+	log.Info().Str("filepath", filepath).Str("collection", collectionName(CollectionMailerPDF)).Msg("Saved image file content to collection")
+	return nil
+}
+func MailerPath(public_id string) string {
+	collection := CollectionMailerPDF
+	return fileContentPath(collection, public_id)
+}