fix(compat): update v1 date parser

Signed-off-by: Universal Studio <[email protected]>

cmd/decode_test.go

@@ -79,13 +79,13 @@ const doc = `# PaperCrypt Version: 2.0.0
 # Content Serial: EIPESR
 # Purpose: Example Sheet
 # Comment: Regular PDF Example
-# Date: Thu, 01 Aug 2024 20:38:10.306596100 CEST
+# Date: Thu, 01 Aug 2024 20:38:10.306596100 +0200
 # Data Format: PGP
 # Content Length: 390
 # Content CRC-24: d6f1c0
 # Content CRC-32: bc4b3672
 # Content SHA-256: NT7wwW5Tq5fk1J82M1tzE82VGxIlad5vpF5cDMzg+yg=
-# Header CRC-32: c2eee21
+# Header CRC-32: ecded03b
 
 
  1: 1F 8B 08 00 00 00 00 00 02 FF 00 6A 01 95 FE C3 2E 04 09 03 08 7A D49E51
@@ -112,13 +112,13 @@ const docRaw = `# PaperCrypt Version: 2.0.0
 # Content Serial: BVC36O
 # Purpose: Example Sheet
 # Comment: Regular PDF Example
-# Date: Sun, 04 Aug 2024 12:36:20.800974400 CEST
+# Date: Sun, 04 Aug 2024 12:36:20.800974400 +0200
 # Data Format: Raw
 # Content Length: 261
 # Content CRC-24: ce50b7
 # Content CRC-32: 5f6b9b4b
 # Content SHA-256: w8b3gibx3gdQsGXmlWVtET631gMT0TDLbe94IC5hXuw=
-# Header CRC-32: 225bb1ed
+# Header CRC-32: 3967f39
 
 
  1: 1F 8B 08 00 00 00 00 00 02 FF 8C 90 3F 6B F3 30 10 C6 77 7F 0A A1 39 B6 C7FEC2

internal/container_file_v1.go

@@ -151,9 +151,7 @@ func (p *PaperCryptV1) GetText(lowerCaseEncoding bool) ([]byte, error) {
 		HeaderFieldComment,
 		p.Comment,
 		HeaderFieldDate,
-		// format time with nanosecond precision
-		// Sat, 12 Aug 2023 17:33:20.123456789
-		p.CreatedAt.Format("Mon, 02 Jan 2006 15:04:05.000000000 MST"),
+		p.CreatedAt.Format(TimeStampFormatLongTZ),
 		HeaderFieldContentLength,
 		p.GetLength(),
 		HeaderFieldCRC24,
@@ -336,9 +334,13 @@ func DeserializeV1Text(data []byte, ignoreVersionMismatch bool, ignoreChecksumMi
 		log.Warn(Warning("Date not present in header!"))
 	}
 
-	timestamp, err := time.Parse("Mon, 02 Jan 2006 15:04:05.000000000 MST", headerDate)
+	timestamp, err := time.Parse(TimeStampFormatLongTZ, headerDate)
 	if err != nil {
-		return nil, errors.Join(errors.New("invalid date format"), err)
+		// try parsing with -0700 over MST
+		timestamp, err = time.Parse(TimeStampFormatLong, headerDate)
+		if err != nil {
+			return nil, errors.Join(errors.New("invalid date format"), err)
+		}
 	}
 
 	// we don't need to pass the checksums, as they are already verified

internal/timestamp.go

@@ -21,7 +21,8 @@
 package internal
 
 const (
-	TimeStampFormatLong      = "Mon, 02 Jan 2006 15:04:05.000000000 MST"
+	TimeStampFormatLong      = "Mon, 02 Jan 2006 15:04:05.000000000 -0700"
+	TimeStampFormatLongTZ    = "Mon, 02 Jan 2006 15:04:05.000000000 MST"
 	TimeStampFormatShort     = "2006-01-02 15:04:05"
 	TimeStampFormatDate      = "2006-01-02"
 	TimeStampFormatPDFHeader = "2006-01-02 15:04 -0700"