mirror of
https://github.com/multipleof4/ntfy.git
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Move action parsing to action package
This commit is contained in:
binwiederhier
@@ -0,0 +1,323 @@
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// Package action parses the "action buttons" that can be attached to a notification, in both the
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// JSON and the human-readable "simple" format described at https://ntfy.sh/docs/publish/#action-buttons.
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package action
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import (
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"encoding/json"
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"errors"
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"fmt"
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"regexp"
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"strings"
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"unicode/utf8"
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"heckel.io/ntfy/v2/model"
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"heckel.io/ntfy/v2/util"
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)
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const (
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actionIDLength = 10
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actionEOF = rune(0)
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actionsMax = 3
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)
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const (
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actionView = "view"
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actionBroadcast = "broadcast"
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actionHTTP = "http"
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actionCopy = "copy"
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)
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var (
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actionsAll = []string{actionView, actionBroadcast, actionHTTP, actionCopy}
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actionsWithURL = []string{actionView, actionHTTP} // Must be distinct from actionsWithValue, see populateAction()
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actionsWithValue = []string{actionCopy} // Must be distinct from actionsWithURL, see populateAction()
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actionsKeyRegex = regexp.MustCompile(`^([-.\w]+)\s*=\s*`)
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)
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type actionParser struct {
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input string
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pos int
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}
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// Parse parses the actions string as described in https://ntfy.sh/docs/publish/#action-buttons.
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// It supports both a JSON representation (if the string begins with "[", see parseActionsFromJSON),
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// and the "simple" format, which is more human-readable, but harder to parse (see parseActionsFromSimple).
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func Parse(s string) (actions []*model.Action, err error) {
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// Parse JSON or simple format
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s = strings.TrimSpace(s)
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if strings.HasPrefix(s, "[") {
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actions, err = parseActionsFromJSON(s)
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} else {
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actions, err = parseActionsFromSimple(s)
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}
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if err != nil {
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return nil, err
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}
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// Add ID field, ensure correct uppercase/lowercase
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for i := range actions {
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actions[i].ID = util.RandomString(actionIDLength)
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actions[i].Action = strings.ToLower(actions[i].Action)
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actions[i].Method = strings.ToUpper(actions[i].Method)
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}
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// Validate
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if len(actions) > actionsMax {
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return nil, fmt.Errorf("only %d actions allowed", actionsMax)
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}
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for _, action := range actions {
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if !util.Contains(actionsAll, action.Action) {
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return nil, fmt.Errorf("parameter 'action' cannot be '%s', valid values are 'view', 'broadcast', 'http' and 'copy'", action.Action)
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} else if action.Label == "" {
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return nil, fmt.Errorf("parameter 'label' is required")
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} else if util.Contains(actionsWithURL, action.Action) && action.URL == "" {
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return nil, fmt.Errorf("parameter 'url' is required for action '%s'", action.Action)
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} else if util.Contains(actionsWithValue, action.Action) && action.Value == "" {
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return nil, fmt.Errorf("parameter 'value' is required for action '%s'", action.Action)
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} else if action.Action == actionHTTP && util.Contains([]string{"GET", "HEAD"}, action.Method) && action.Body != "" {
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return nil, fmt.Errorf("parameter 'body' cannot be set if method is %s", action.Method)
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}
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}
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return actions, nil
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}
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// parseActionsFromJSON converts a JSON array into an array of actions
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func parseActionsFromJSON(s string) ([]*model.Action, error) {
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actions := make([]*model.Action, 0)
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if err := json.Unmarshal([]byte(s), &actions); err != nil {
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return nil, fmt.Errorf("JSON error: %w", err)
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}
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return actions, nil
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}
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// parseActionsFromSimple parses the "simple" actions string (as described in
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// https://ntfy.sh/docs/publish/#action-buttons), into an array of actions.
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//
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// It can parse an actions string like this:
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//
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// view, "Look ma, commas and \"quotes\" too", url=https://..; action=broadcast, ...
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//
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// It works by advancing the position ("pos") through the input string ("input").
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//
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// The parser is heavily inspired by https://go.dev/src/text/template/parse/lex.go (which
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// is described by Rob Pike in this video: https://www.youtube.com/watch?v=HxaD_trXwRE),
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// though it does not use state functions at all.
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//
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// Other resources:
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//
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// https://adampresley.github.io/2015/04/12/writing-a-lexer-and-parser-in-go-part-1.html
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// https://github.com/adampresley/sample-ini-parser/blob/master/services/lexer/lexer/Lexer.go
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// https://github.com/benbjohnson/sql-parser/blob/master/scanner.go
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// https://blog.gopheracademy.com/advent-2014/parsers-lexers/
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func parseActionsFromSimple(s string) ([]*model.Action, error) {
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if !utf8.ValidString(s) {
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return nil, errors.New("invalid utf-8 string")
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}
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parser := &actionParser{
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pos: 0,
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input: s,
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}
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return parser.Parse()
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}
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// Parse loops trough parseAction() until the end of the string is reached
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func (p *actionParser) Parse() ([]*model.Action, error) {
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actions := make([]*model.Action, 0)
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for !p.eof() {
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a, err := p.parseAction()
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if err != nil {
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return nil, err
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}
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actions = append(actions, a)
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}
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return actions, nil
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}
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// parseAction parses the individual sections of an action using parseSection into key/value pairs,
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// and then uses populateAction to interpret the keys/values. The function terminates
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// when EOF or ";" is reached.
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func (p *actionParser) parseAction() (*model.Action, error) {
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a := model.NewAction()
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section := 0
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for {
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key, value, last, err := p.parseSection()
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if err != nil {
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return nil, err
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}
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if err := populateAction(a, section, key, value); err != nil {
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return nil, err
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}
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p.slurpSpaces()
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if last {
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return a, nil
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}
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section++
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}
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}
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// populateAction is the "business logic" of the parser. It applies the key/value
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// pair to the action instance.
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func populateAction(newAction *model.Action, section int, key, value string) error {
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// Auto-expand keys based on their index
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if key == "" && section == 0 {
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key = "action"
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} else if key == "" && section == 1 {
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key = "label"
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} else if key == "" && section == 2 && util.Contains(actionsWithURL, newAction.Action) {
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key = "url"
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} else if key == "" && section == 2 && util.Contains(actionsWithValue, newAction.Action) {
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key = "value"
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}
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// Validate
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if key == "" {
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return fmt.Errorf("term '%s' unknown", value)
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}
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// Populate
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if strings.HasPrefix(key, "headers.") {
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newAction.Headers[strings.TrimPrefix(key, "headers.")] = value
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} else if strings.HasPrefix(key, "extras.") {
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newAction.Extras[strings.TrimPrefix(key, "extras.")] = value
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} else {
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switch strings.ToLower(key) {
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case "action":
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newAction.Action = value
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case "label":
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newAction.Label = value
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case "clear":
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lvalue := strings.ToLower(value)
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if !util.Contains([]string{"true", "yes", "1", "false", "no", "0"}, lvalue) {
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return fmt.Errorf("parameter 'clear' cannot be '%s', only boolean values are allowed (true/yes/1/false/no/0)", value)
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}
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newAction.Clear = lvalue == "true" || lvalue == "yes" || lvalue == "1"
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case "url":
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newAction.URL = value
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case "method":
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newAction.Method = value
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case "body":
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newAction.Body = value
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case "value":
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newAction.Value = value
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case "intent":
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newAction.Intent = value
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default:
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return fmt.Errorf("key '%s' unknown", key)
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}
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}
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return nil
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}
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// parseSection parses a section ("key=value") and returns a key/value pair. It terminates
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// when EOF or "," is reached.
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func (p *actionParser) parseSection() (key string, value string, last bool, err error) {
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p.slurpSpaces()
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key = p.parseKey()
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r, w := p.peek()
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if isSectionEnd(r) {
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p.pos += w
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last = isLastSection(r)
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return
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} else if r == '"' || r == '\'' {
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value, last, err = p.parseQuotedValue(r)
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return
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}
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value, last = p.parseValue()
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return
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}
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// parseKey uses a regex to determine whether the current position is a key definition ("key =")
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// and returns the key if it is, or an empty string otherwise.
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func (p *actionParser) parseKey() string {
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matches := actionsKeyRegex.FindStringSubmatch(p.input[p.pos:])
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if len(matches) == 2 {
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p.pos += len(matches[0])
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return matches[1]
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}
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return ""
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}
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// parseValue reads the input until EOF, "," or ";" and returns the value string. Unlike parseQuotedValue,
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// this function does not support "," or ";" in the value itself, and spaces in the beginning and end of the
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// string are trimmed.
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func (p *actionParser) parseValue() (value string, last bool) {
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start := p.pos
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for {
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r, w := p.peek()
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if isSectionEnd(r) {
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last = isLastSection(r)
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value = strings.TrimSpace(p.input[start:p.pos])
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p.pos += w
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return
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}
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p.pos += w
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}
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}
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// parseQuotedValue reads the input until it finds an unescaped end quote character ("), and then
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// advances the position beyond the section end. It supports quoting strings using backslash (\).
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func (p *actionParser) parseQuotedValue(quote rune) (value string, last bool, err error) {
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p.pos++
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start := p.pos
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var prev rune
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for {
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r, w := p.peek()
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if r == actionEOF {
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err = fmt.Errorf("unexpected end of input, quote started at position %d", start)
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return
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} else if r == quote && prev != '\\' {
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value = strings.ReplaceAll(p.input[start:p.pos], "\\"+string(quote), string(quote)) // \" -> "
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p.pos += w
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// Advance until section end (after "," or ";")
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p.slurpSpaces()
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r, w := p.peek()
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last = isLastSection(r)
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if !isSectionEnd(r) {
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err = fmt.Errorf("unexpected character '%c' at position %d", r, p.pos)
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return
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}
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p.pos += w
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return
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}
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prev = r
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p.pos += w
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}
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}
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// slurpSpaces reads all space characters and advances the position
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func (p *actionParser) slurpSpaces() {
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for {
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r, w := p.peek()
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if r == actionEOF || !isSpace(r) {
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return
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}
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p.pos += w
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}
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}
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// peek returns the next run and its width
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func (p *actionParser) peek() (rune, int) {
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if p.eof() {
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return actionEOF, 0
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}
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return utf8.DecodeRuneInString(p.input[p.pos:])
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}
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// eof returns true if the end of the input has been reached
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func (p *actionParser) eof() bool {
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return p.pos >= len(p.input)
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}
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func isSpace(r rune) bool {
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return r == ' ' || r == '\t' || r == '\r' || r == '\n'
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}
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func isSectionEnd(r rune) bool {
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return r == actionEOF || r == ';' || r == ','
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}
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func isLastSection(r rune) bool {
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return r == actionEOF || r == ';'
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}
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@@ -0,0 +1,223 @@
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package action
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import (
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestParseActions(t *testing.T) {
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actions, err := Parse("[]")
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require.Nil(t, err)
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require.Empty(t, actions)
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// Basic test
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actions, err = Parse("action=http, label=Open door, url=https://door.lan/open; view, Show portal, https://door.lan")
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require.Nil(t, err)
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require.Equal(t, 2, len(actions))
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require.Equal(t, "http", actions[0].Action)
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require.Equal(t, "Open door", actions[0].Label)
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require.Equal(t, "https://door.lan/open", actions[0].URL)
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require.Equal(t, "view", actions[1].Action)
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require.Equal(t, "Show portal", actions[1].Label)
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require.Equal(t, "https://door.lan", actions[1].URL)
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// JSON
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actions, err = Parse(`[{"action":"http","label":"Open door","url":"https://door.lan/open"}, {"action":"view","label":"Show portal","url":"https://door.lan"}]`)
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require.Nil(t, err)
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require.Equal(t, 2, len(actions))
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require.Equal(t, "http", actions[0].Action)
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require.Equal(t, "Open door", actions[0].Label)
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require.Equal(t, "https://door.lan/open", actions[0].URL)
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require.Equal(t, "view", actions[1].Action)
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require.Equal(t, "Show portal", actions[1].Label)
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require.Equal(t, "https://door.lan", actions[1].URL)
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// Other params
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actions, err = Parse("action=http, label=Open door, url=https://door.lan/open, body=this is a body, method=PUT")
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require.Nil(t, err)
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require.Equal(t, 1, len(actions))
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require.Equal(t, "http", actions[0].Action)
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require.Equal(t, "Open door", actions[0].Label)
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require.Equal(t, "https://door.lan/open", actions[0].URL)
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require.Equal(t, "PUT", actions[0].Method)
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require.Equal(t, "this is a body", actions[0].Body)
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// Extras with underscores
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actions, err = Parse("action=broadcast, label=Do a thing, extras.command=some command, extras.some_param=a parameter")
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require.Nil(t, err)
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require.Equal(t, 1, len(actions))
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require.Equal(t, "broadcast", actions[0].Action)
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require.Equal(t, "Do a thing", actions[0].Label)
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require.Equal(t, 2, len(actions[0].Extras))
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require.Equal(t, "some command", actions[0].Extras["command"])
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require.Equal(t, "a parameter", actions[0].Extras["some_param"])
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// Broadcast action with intent
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actions, err = Parse("action=broadcast, label=Do a thing, intent=io.heckel.ntfy.TEST_INTENT")
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require.Nil(t, err)
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require.Equal(t, 1, len(actions))
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require.Equal(t, "broadcast", actions[0].Action)
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require.Equal(t, "Do a thing", actions[0].Label)
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require.Equal(t, "io.heckel.ntfy.TEST_INTENT", actions[0].Intent)
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// Headers with dashes
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actions, err = Parse("action=http, label=Send request, url=http://example.com, method=GET, headers.Content-Type=application/json, headers.Authorization=Basic sdasffsf")
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require.Nil(t, err)
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require.Equal(t, 1, len(actions))
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require.Equal(t, "http", actions[0].Action)
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require.Equal(t, "Send request", actions[0].Label)
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require.Equal(t, 2, len(actions[0].Headers))
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require.Equal(t, "application/json", actions[0].Headers["Content-Type"])
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require.Equal(t, "Basic sdasffsf", actions[0].Headers["Authorization"])
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// Quotes
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actions, err = Parse(`action=http, "Look ma, \"quotes\"; and semicolons", url=http://example.com`)
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require.Nil(t, err)
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require.Equal(t, 1, len(actions))
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require.Equal(t, "http", actions[0].Action)
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require.Equal(t, `Look ma, "quotes"; and semicolons`, actions[0].Label)
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require.Equal(t, `http://example.com`, actions[0].URL)
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// Single quotes
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actions, err = Parse(`action=http, '"quotes" and \'single quotes\'', url=http://example.com`)
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require.Nil(t, err)
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require.Equal(t, 1, len(actions))
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require.Equal(t, "http", actions[0].Action)
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require.Equal(t, `"quotes" and 'single quotes'`, actions[0].Label)
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require.Equal(t, `http://example.com`, actions[0].URL)
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// Single quotes (JSON)
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actions, err = Parse(`action=http, Post it, url=http://example.com, body='{"temperature": 65}'`)
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require.Nil(t, err)
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require.Equal(t, 1, len(actions))
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require.Equal(t, "http", actions[0].Action)
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require.Equal(t, "Post it", actions[0].Label)
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require.Equal(t, `http://example.com`, actions[0].URL)
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require.Equal(t, `{"temperature": 65}`, actions[0].Body)
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// Out of order
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actions, err = Parse(`label="Out of order!" , action="http", url=http://example.com`)
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require.Nil(t, err)
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require.Equal(t, 1, len(actions))
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require.Equal(t, "http", actions[0].Action)
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require.Equal(t, `Out of order!`, actions[0].Label)
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require.Equal(t, `http://example.com`, actions[0].URL)
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// Spaces
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actions, err = Parse(`action = http, label = 'this is a label', url = "http://google.com"`)
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require.Nil(t, err)
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require.Equal(t, 1, len(actions))
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require.Equal(t, "http", actions[0].Action)
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require.Equal(t, `this is a label`, actions[0].Label)
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require.Equal(t, `http://google.com`, actions[0].URL)
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|
||||
// Non-ASCII
|
||||
actions, err = Parse(`action = http, 'Кохайтеся а не воюйте, 💙🫤', url = "http://google.com"`)
|
||||
require.Nil(t, err)
|
||||
require.Equal(t, 1, len(actions))
|
||||
require.Equal(t, "http", actions[0].Action)
|
||||
require.Equal(t, `Кохайтеся а не воюйте, 💙🫤`, actions[0].Label)
|
||||
require.Equal(t, `http://google.com`, actions[0].URL)
|
||||
|
||||
// Multiple actions, awkward spacing
|
||||
actions, err = Parse(`http , 'Make love, not war 💙🫤' , https://ntfy.sh ; view, " yo ", https://x.org, clear=true`)
|
||||
require.Nil(t, err)
|
||||
require.Equal(t, 2, len(actions))
|
||||
require.Equal(t, "http", actions[0].Action)
|
||||
require.Equal(t, `Make love, not war 💙🫤`, actions[0].Label)
|
||||
require.Equal(t, `https://ntfy.sh`, actions[0].URL)
|
||||
require.Equal(t, false, actions[0].Clear)
|
||||
require.Equal(t, "view", actions[1].Action)
|
||||
require.Equal(t, " yo ", actions[1].Label)
|
||||
require.Equal(t, `https://x.org`, actions[1].URL)
|
||||
require.Equal(t, true, actions[1].Clear)
|
||||
|
||||
// Copy action (simple format)
|
||||
actions, err = Parse("copy, Copy code, 1234")
|
||||
require.Nil(t, err)
|
||||
require.Equal(t, 1, len(actions))
|
||||
require.Equal(t, "copy", actions[0].Action)
|
||||
require.Equal(t, "Copy code", actions[0].Label)
|
||||
require.Equal(t, "1234", actions[0].Value)
|
||||
|
||||
// Copy action (JSON)
|
||||
actions, err = Parse(`[{"action":"copy","label":"Copy OTP","value":"567890"}]`)
|
||||
require.Nil(t, err)
|
||||
require.Equal(t, 1, len(actions))
|
||||
require.Equal(t, "copy", actions[0].Action)
|
||||
require.Equal(t, "Copy OTP", actions[0].Label)
|
||||
require.Equal(t, "567890", actions[0].Value)
|
||||
|
||||
// Copy action with clear
|
||||
actions, err = Parse("copy, Copy code, 1234, clear=true")
|
||||
require.Nil(t, err)
|
||||
require.Equal(t, 1, len(actions))
|
||||
require.Equal(t, "copy", actions[0].Action)
|
||||
require.Equal(t, "Copy code", actions[0].Label)
|
||||
require.Equal(t, "1234", actions[0].Value)
|
||||
require.Equal(t, true, actions[0].Clear)
|
||||
|
||||
// Copy action with explicit value key
|
||||
actions, err = Parse("action=copy, label=Copy token, clear=true, value=abc-123-def")
|
||||
require.Nil(t, err)
|
||||
require.Equal(t, 1, len(actions))
|
||||
require.Equal(t, "copy", actions[0].Action)
|
||||
require.Equal(t, "Copy token", actions[0].Label)
|
||||
require.Equal(t, "abc-123-def", actions[0].Value)
|
||||
require.True(t, actions[0].Clear)
|
||||
|
||||
// Copy action without value (error)
|
||||
_, err = Parse("copy, Copy code")
|
||||
require.EqualError(t, err, "parameter 'value' is required for action 'copy'")
|
||||
|
||||
// Invalid syntax
|
||||
_, err = Parse(`label="Out of order!" x, action="http", url=http://example.com`)
|
||||
require.EqualError(t, err, "unexpected character 'x' at position 22")
|
||||
|
||||
_, err = Parse(`label="", action="http", url=http://example.com`)
|
||||
require.EqualError(t, err, "parameter 'label' is required")
|
||||
|
||||
_, err = Parse(`label=, action="http", url=http://example.com`)
|
||||
require.EqualError(t, err, "parameter 'label' is required")
|
||||
|
||||
_, err = Parse(`label="xx", action="http", url=http://example.com, what is this anyway`)
|
||||
require.EqualError(t, err, "term 'what is this anyway' unknown")
|
||||
|
||||
_, err = Parse(`fdsfdsf`)
|
||||
require.EqualError(t, err, "parameter 'action' cannot be 'fdsfdsf', valid values are 'view', 'broadcast', 'http' and 'copy'")
|
||||
|
||||
_, err = Parse(`aaa=a, "bbb, 'ccc, ddd, eee "`)
|
||||
require.EqualError(t, err, "key 'aaa' unknown")
|
||||
|
||||
_, err = Parse(`action=http, label="omg the end quote is missing`)
|
||||
require.EqualError(t, err, "unexpected end of input, quote started at position 20")
|
||||
|
||||
_, err = Parse(`;;;;`)
|
||||
require.EqualError(t, err, "only 3 actions allowed")
|
||||
|
||||
_, err = Parse(`,,,,,,;;`)
|
||||
require.EqualError(t, err, "term '' unknown")
|
||||
|
||||
_, err = Parse(`''";,;"`)
|
||||
require.EqualError(t, err, "unexpected character '\"' at position 2")
|
||||
|
||||
_, err = Parse(`action=http, label=a label, body=somebody`)
|
||||
require.EqualError(t, err, "parameter 'url' is required for action 'http'")
|
||||
|
||||
_, err = Parse(`action=http, label=a label, url=http://ntfy.sh, method=HEAD, body=somebody`)
|
||||
require.EqualError(t, err, "parameter 'body' cannot be set if method is HEAD")
|
||||
|
||||
_, err = Parse(`[ invalid json ]`)
|
||||
require.EqualError(t, err, "JSON error: invalid character 'i' looking for beginning of value")
|
||||
|
||||
_, err = Parse(`[ { "some": "object" } ]`)
|
||||
require.EqualError(t, err, "parameter 'action' cannot be '', valid values are 'view', 'broadcast', 'http' and 'copy'")
|
||||
|
||||
_, err = Parse("\x00\x01\xFFx\xFE")
|
||||
require.EqualError(t, err, "invalid utf-8 string")
|
||||
|
||||
_, err = Parse(`http, label, http://x.org, clear=x`)
|
||||
require.EqualError(t, err, "parameter 'clear' cannot be 'x', only boolean values are allowed (true/yes/1/false/no/0)")
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user