170 lines
3.4 KiB
Go
170 lines
3.4 KiB
Go
// Copyright (c) 2025-2026 Probo Inc <hello@getprobo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package page
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import (
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"encoding/base64"
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"encoding/json"
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"errors"
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"go.probo.inc/probo/pkg/gid"
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)
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type CursorKey struct {
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ID gid.GID
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Value any
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}
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// StringCursorKey is a cursor key for string IDs
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type StringCursorKey struct {
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ID string
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Value any
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}
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var (
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CursorKeyNil CursorKey
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ErrInvalidFormat = errors.New("invalid format")
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)
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func ParseCursorKey(s string) (CursorKey, error) {
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data, err := base64.RawURLEncoding.DecodeString(s)
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if err != nil {
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return CursorKeyNil, ErrInvalidFormat
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}
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var arr []json.RawMessage
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if err := json.Unmarshal(data, &arr); err != nil {
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return CursorKeyNil, ErrInvalidFormat
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}
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if len(arr) != 2 {
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return CursorKeyNil, ErrInvalidFormat
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}
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var idStr string
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if err := json.Unmarshal(arr[0], &idStr); err != nil {
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return CursorKeyNil, ErrInvalidFormat
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}
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id, err := gid.ParseGID(idStr)
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if err != nil {
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return CursorKeyNil, ErrInvalidFormat
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}
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var value any
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if err := json.Unmarshal(arr[1], &value); err != nil {
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return CursorKeyNil, ErrInvalidFormat
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}
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return CursorKey{
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ID: id,
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Value: value,
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}, nil
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}
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func NewCursorKey(id gid.GID, value any) CursorKey {
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return CursorKey{
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ID: id,
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Value: value,
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}
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}
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func (ck CursorKey) Bytes() []byte {
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data, _ := ck.MarshalBinary()
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return data
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}
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func (ck CursorKey) String() string {
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data, err := ck.MarshalBinary()
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if err != nil {
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return ""
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}
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return base64.RawURLEncoding.EncodeToString(data)
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}
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func (ck CursorKey) FieldValue() any {
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return ck.Value
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}
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func (ck CursorKey) MarshalText() ([]byte, error) {
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return []byte(ck.String()), nil
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}
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func (ck *CursorKey) UnmarshalText(data []byte) error {
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newCk, err := ParseCursorKey(string(data))
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if err != nil {
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return err
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}
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*ck = newCk
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return nil
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}
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func (ck CursorKey) MarshalBinary() ([]byte, error) {
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arr := []any{ck.ID.String(), ck.Value}
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return json.Marshal(arr)
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}
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func (ck *CursorKey) UnmarshalBinary(data []byte) error {
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var arr []json.RawMessage
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if err := json.Unmarshal(data, &arr); err != nil {
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return err
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}
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if len(arr) != 2 {
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return ErrInvalidFormat
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}
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// Parse the ID
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var idStr string
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if err := json.Unmarshal(arr[0], &idStr); err != nil {
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return ErrInvalidFormat
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}
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id, err := gid.ParseGID(idStr)
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if err != nil {
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return ErrInvalidFormat
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}
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var value any
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if err := json.Unmarshal(arr[1], &value); err != nil {
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return ErrInvalidFormat
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}
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ck.ID = id
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ck.Value = value
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return nil
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}
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func (ck CursorKey) MarshalJSON() ([]byte, error) {
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return json.Marshal(ck.String())
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}
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func (ck *CursorKey) UnmarshalJSON(data []byte) error {
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var s string
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if err := json.Unmarshal(data, &s); err != nil {
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return err
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}
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parsed, err := ParseCursorKey(s)
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if err != nil {
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return err
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}
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*ck = parsed
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return nil
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}
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