99 lines
2.2 KiB
Go
99 lines
2.2 KiB
Go
package models
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import (
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"encoding/json"
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"time"
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)
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// A slice of Meta
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type Metas []Meta
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// Returns a single map containing all the Meta. Is useful when encoding to JSON
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func (ms Metas) Map() map[string]any {
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out := map[string]any{}
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for _, f := range ms {
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if _, found := out[f.Key]; found || f.Key == "title" || f.Key == "date" {
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continue
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}
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if f.Key == "json" {
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ob := map[string]any{}
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if j, ok := f.Value.(json.RawMessage); ok {
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json.Unmarshal(j, &ob)
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}
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// If we couldn't get valid data from there, this will just be empty
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for k, v := range ob {
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if k != "title" && k != "date" {
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out[k] = v
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}
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}
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} else {
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out[f.Key] = f.Value
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if vt, ok := f.Value.(time.Time); ok {
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out[f.Key] = vt.Format(time.RFC3339)
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}
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}
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}
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return out
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}
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// Implements json.Marshaler
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func (ms Metas) MarshalJSON() ([]byte, error) {
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return json.Marshal(ms.Map())
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}
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// Implements json.Unmarshaler
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func (ms *Metas) UnmarshalJSON(in []byte) error {
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old := (*ms).Map()
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out := map[string]any{}
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err := json.Unmarshal(in, &out)
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if err != nil {
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return err
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}
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ret := *ms
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for k, v := range out {
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if _, found := old[k]; k != "title" && k != "date" && !found {
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ret = append(ret, Meta{k, v})
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}
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}
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*ms = ret
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return nil
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}
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// Returns a new Metas with a new Meta appended
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func (ms Metas) Append(k string, v any) Metas {
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return append(ms, Meta{k, v})
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}
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// Appends a new Meta to this Metas
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func (ms *Metas) AppendTo(k string, v any) {
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n := (*ms).Append(k, v)
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*ms = n
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}
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// Returns the value of the Meta with the given key, and a bool indicating if it was found
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func (ms Metas) Get(key string) (any, bool) {
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_, m, ok := ms.findVal(key)
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return m.Value, ok
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}
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// Set sets the key to the given value.
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// If key is already in the ms, Set updates the value of the found Meta.
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// If key is not in ms, then we append a new Meta and return the modified Metas.
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func (ms Metas) Set(key string, value any) Metas {
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idx, m, found := ms.findVal(key)
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if !found {
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return ms.Append(key, value)
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}
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m.Value = value
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ms[idx] = m
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return ms
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}
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func (ms Metas) findVal(key string) (idx int, m Meta, found bool) {
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for idx, m = range ms {
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if m.Key == key {
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return idx, m, true
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}
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}
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return 0, Meta{}, false
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}
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