add internal/feed/time*go

1 files changed, 44 insertions, 0 deletions

diff --git a/internal/feed/time.go b/internal/feed/time.go
new file mode 100644
index 0000000..6eb5d37
--- /dev/null
+++ b/internal/feed/time.go
@@ -0,0 +1,44 @@
+package feed
+
+import (
+  "encoding/json"
+  "fmt"
+  // "strconv"
+  "regexp"
+  "time"
+)
+
+// partial timestamp
+type Time time.Time
+
+var timeRe = regexp.MustCompile("\\A\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}Z\\z")
+
+// Unmarshal timestamp from JSON.
+func (me *Time) UnmarshalJSON(b []byte) error {
+  // decode string, check for error
+  var s string
+  if err := json.Unmarshal(b, &s); err != nil {
+    return err
+  }
+
+  // match partial string regex
+  if !timeRe.MatchString(s) {
+    return fmt.Errorf("invalid time: \"%s\"", s)
+  }
+
+  // correct string suffix
+  s = s[0:16] + ":00Z"
+
+  // unmarshal time
+  var t time.Time
+  if err := t.UnmarshalText([]byte(s)); err != nil {
+    return err
+  }
+
+  // save time
+  *me = Time(t)
+
+  // return success
+  return nil
+}
+