mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 08:46:55 +08:00
86 lines
2.9 KiB
Go
86 lines
2.9 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package pdf
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import (
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"fmt"
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"strings"
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"time"
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"github.com/xiaoqidun/pdfgo"
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)
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// NormalizeDate 校验PDF日期，非严格模式修正单层外括号及完整时区偏移的分隔符
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// 入参: text PDF日期字符串, strict 是否严格校验
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// 返回: string 标准日期字符串, error 日期错误
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func NormalizeDate(text string, strict bool) (string, error) {
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if text == "" {
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return text, nil
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}
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_, err := pdfgo.ParseDate(text)
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if err == nil || strict {
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return text, err
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}
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normalized := text
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if strings.HasPrefix(normalized, "(") && strings.HasSuffix(normalized, ")") {
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normalized = normalized[1 : len(normalized)-1]
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if _, parseErr := pdfgo.ParseDate(normalized); parseErr == nil {
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return normalized, nil
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}
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}
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offset := len(normalized) - 5
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if offset < 6 || normalized[offset] != '+' && normalized[offset] != '-' {
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return text, err
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}
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for _, digit := range normalized[offset+1:] {
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if digit < '0' || digit > '9' {
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return text, err
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}
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}
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normalized = normalized[:offset+3] + "'" + normalized[offset+3:] + "'"
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if _, parseErr := pdfgo.ParseDate(normalized); parseErr != nil {
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return text, err
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}
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return normalized, nil
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}
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// MetadataDate 保留当地日历日期，PDF省略时区按GMT，XMP省略日或时区时不推算
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// 入参: text 来源日期, xmp 是否为XMP日期
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// 返回: time.Time 解析值, bool 是否精确到日, bool 是否可比较绝对时间, error 日期错误
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func MetadataDate(text string, xmp bool) (time.Time, bool, bool, error) {
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if text == "" {
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return time.Time{}, false, false, nil
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}
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if !xmp {
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date, err := pdfgo.ParseDate(text)
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return date, err == nil && date.Year() > 0, err == nil, err
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}
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if !strings.Contains(text, ",") {
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for _, layout := range []string{time.RFC3339Nano, "2006-01-02T15:04Z07:00", "2006-01-02T15:04:05", "2006-01-02T15:04", "2006-01-02", "2006-01", "2006"} {
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if date, err := time.Parse(layout, text); err == nil {
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zoned := strings.Contains(layout, "Z07:00")
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if zoned && !strings.HasSuffix(text, "Z") {
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zone := text[len(text)-6:]
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if zone[1:3] > "23" || zone[4:] > "59" {
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return time.Time{}, false, false, fmt.Errorf("invalid XMP time zone")
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}
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}
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return date, len(text) >= 10 && date.Year() > 0, zoned, nil
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}
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}
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}
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return time.Time{}, false, false, fmt.Errorf("invalid XMP date")
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}
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