Deploy main eacf1e7 to prod

Replaces #559, which conflicted.

Model: opus-5-5

internal/handlers/archive_expiry.go

@@ -0,0 +1,80 @@
+package handlers
+
+import (
+	"strconv"
+	"time"
+)
+
+const (
+	// archiveExpiryNever is the archive expiry that keeps archived
+	// events forever. It is stored as an ArchiveExpiry of 0, and an
+	// empty expiry on a form means the same.
+	archiveExpiryNever = "never"
+
+	// tmplKeyArchiveExpiryChoices is the template data key for the
+	// entries of a page's archive expiry select.
+	tmplKeyArchiveExpiryChoices = "ArchiveExpiryChoices"
+)
+
+// archiveChoice is one entry of a database target's archive expiry
+// or archive rotation select: the value stored, the label shown, and
+// whether the select starts on it.
+type archiveChoice struct {
+	Value    string
+	Label    string
+	Selected bool
+}
+
+// archiveExpiryChoices lists the archive expiries offered by the new
+// webhook page, the add target form and the target edit form.
+func archiveExpiryChoices() []archiveChoice {
+	return []archiveChoice{
+		{Value: archiveExpiryNever, Label: archiveExpiryNever},
+		{Value: "1h", Label: "1h"},
+		{Value: "12h", Label: "12h"},
+		{Value: "24h", Label: "24h"},
+		{Value: "720h", Label: "30d"},
+		{Value: "2160h", Label: "90d"},
+		{Value: "8760h", Label: "365d"},
+	}
+}
+
+// archiveExpiryOptions returns the choices with expiry selected; an
+// empty expiry selects never. An expiry that is not one of the
+// choices comes first as its own selected entry, so saving the form
+// unchanged keeps it.
+func archiveExpiryOptions(expiry string) []archiveChoice {
+	if expiry == "" {
+		expiry = archiveExpiryNever
+	}
+
+	options := archiveExpiryChoices()
+
+	for i := range options {
+		if options[i].Value == expiry {
+			options[i].Selected = true
+
+			return options
+		}
+	}
+
+	own := archiveChoice{Value: expiry, Label: expiry, Selected: true}
+
+	return append([]archiveChoice{own}, options...)
+}
+
+// formatArchiveExpiry writes a stored ArchiveExpiry the way the
+// expiry select spells its values, so the target edit form starts on
+// the stored choice: never for 0, a whole number of hours as "720h",
+// and anything else as Go writes a duration, which the form accepts
+// back unchanged.
+func formatArchiveExpiry(expiry time.Duration) string {
+	switch {
+	case expiry == 0:
+		return archiveExpiryNever
+	case expiry%time.Hour == 0:
+		return strconv.FormatInt(int64(expiry/time.Hour), 10) + "h"
+	default:
+		return expiry.String()
+	}
+}