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33 lines
1.2 KiB
Go
33 lines
1.2 KiB
Go
package web
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import (
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"time"
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// Embed the IANA tz database so time.LoadLocation resolves every zone name
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// regardless of the runtime environment. The production image is
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// distroless/static and the build is CGO_ENABLED=0, so without this the OS
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// zoneinfo may be absent and validation would reject valid zones. Embedding it
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// here (where the only LoadLocation call lives) also makes ValidTimeZone
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// deterministic in tests, independent of the host's zoneinfo.
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_ "time/tzdata"
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)
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// ValidTimeZone reports whether name is an acceptable stored zone: "" (meaning
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// auto-detect in the browser) or a real IANA name that time.LoadLocation
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// resolves. The zone list itself isn't maintained here — the account picker is
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// populated in the browser from Intl.supportedValuesOf("timeZone"); this is just
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// the server-side guard that the submitted value is a genuine zone.
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//
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// "Local" is rejected: LoadLocation accepts it (the server's own zone), but it's
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// meaningless as a per-user display preference and wouldn't round-trip to the
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// browser's Intl.
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func ValidTimeZone(name string) bool {
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if name == "" {
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return true
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}
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if name == "Local" {
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return false
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}
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_, err := time.LoadLocation(name)
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return err == nil
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}
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