56 lines
1.3 KiB
Go
56 lines
1.3 KiB
Go
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package server
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import (
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"encoding/json"
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"firebase.google.com/go/messaging"
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"net/http"
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"strings"
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)
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const (
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fcmMessageLimit = 4000
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)
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// maybeTruncateFCMMessage performs best-effort truncation of FCM messages.
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// The docs say the limit is 4000 characters, but during testing it wasn't quite clear
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// what fields matter; so we're just capping the serialized JSON to 4000 bytes.
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func maybeTruncateFCMMessage(m *messaging.Message) *messaging.Message {
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s, err := json.Marshal(m)
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if err != nil {
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return m
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}
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if len(s) > fcmMessageLimit {
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over := len(s) - fcmMessageLimit + 16 // = len("truncated":"1",), sigh ...
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message, ok := m.Data["message"]
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if ok && len(message) > over {
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m.Data["truncated"] = "1"
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m.Data["message"] = message[:len(message)-over]
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}
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}
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return m
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}
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func readBoolParam(r *http.Request, defaultValue bool, names ...string) bool {
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value := strings.ToLower(readParam(r, names...))
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if value == "" {
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return defaultValue
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}
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return value == "1" || value == "yes" || value == "true"
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}
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func readParam(r *http.Request, names ...string) string {
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for _, name := range names {
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value := r.Header.Get(name)
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if value != "" {
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return strings.TrimSpace(value)
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}
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}
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for _, name := range names {
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value := r.URL.Query().Get(strings.ToLower(name))
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if value != "" {
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return strings.TrimSpace(value)
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}
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}
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return ""
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}
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