photoprism/pkg/txt/datetime_filepath.go

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package txt
import (
"strings"
"time"
)
// DateFromFilePath returns a string as time or the zero time instant in case it can not be converted.
func DateFromFilePath(s string) (result time.Time) {
defer func() {
if r := recover(); r != nil {
result = time.Time{}
}
}()
if len(s) < 6 {
return time.Time{}
}
if !strings.HasPrefix(s, "/") {
s = "/" + s
}
b := []byte(s)
if found := DateTimeRegexp.Find(b); len(found) > 0 { // Is it a date with time like "2020-01-30_09-57-18"?
n := DateIntRegexp.FindAll(found, -1)
if len(n) < 6 {
return result
}
year := ExpandYear(string(n[0]))
month := Int(string(n[1]))
day := Int(string(n[2]))
hour := Int(string(n[3]))
min := Int(string(n[4]))
sec := Int(string(n[5]))
// Perform date plausibility check.
if year < YearMin || year > YearMax || month < MonthMin || month > MonthMax || day < DayMin || day > DayMax {
return result
}
// Perform time plausibility check.
if hour < HourMin || hour > HourMax || min < MinMin || min > MinMax || sec < SecMin || sec > SecMax {
return result
}
result = time.Date(
year,
time.Month(month),
day,
hour,
min,
sec,
0,
time.UTC)
} else if found = DateRegexp.Find(b); len(found) > 0 { // Is it a date only like "2020-01-30"?
n := DateIntRegexp.FindAll(found, -1)
if len(n) != 3 {
return result
}
year := ExpandYear(string(n[0]))
month := Int(string(n[1]))
day := Int(string(n[2]))
// Perform date plausibility check.
if year < YearMin || year > YearMax || month < MonthMin || month > MonthMax || day < DayMin || day > DayMax {
return result
}
result = time.Date(
year,
time.Month(month),
day,
0,
0,
0,
0,
time.UTC)
} else if found = DatePathRegexp.Find(b); len(found) > 0 { // Is it a date path like "2020/01/03"?
n := DateIntRegexp.FindAll(found, -1)
if len(n) < 2 || len(n) > 3 {
return result
}
year := ExpandYear(string(n[0]))
month := Int(string(n[1]))
if year < YearMin || year > YearMax || month < MonthMin || month > MonthMax {
return result
}
if len(n) == 2 {
result = time.Date(
year,
time.Month(month),
1,
0,
0,
0,
0,
time.UTC)
} else if day := Int(string(n[2])); day >= DayMin && day <= DayMax {
result = time.Date(
year,
time.Month(month),
day,
0,
0,
0,
0,
time.UTC)
}
}
return result.UTC()
}