101 lines
2.2 KiB
Go
101 lines
2.2 KiB
Go
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// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.
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package target
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import (
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"errors"
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"fmt"
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"net/url"
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"strings"
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"path/filepath"
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"log/slog"
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)
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var (
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ErrUnknownTargetType = errors.New("Unknown target type")
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TargetTypes *Types = NewTypes()
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)
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type TypeName string //`json:"type"`
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type TypeFactory func(*url.URL) DocTarget
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type Types struct {
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registry map[string]TypeFactory
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}
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func NewTypes() *Types {
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return &Types{registry: make(map[string]TypeFactory)}
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}
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func (t *Types) Register(names []string, factory TypeFactory) {
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for _,name := range names {
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t.registry[name] = factory
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}
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}
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func (t *Types) FromExtension(path string) (TypeFactory, error) {
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elements := strings.Split(path, ".")
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numberOfElements := len(elements)
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if numberOfElements > 2 {
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if src := t.Get(strings.Join(elements[numberOfElements - 2: numberOfElements - 1], ".")); src != nil {
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return src, nil
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}
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}
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if src := t.Get(elements[numberOfElements - 1]); src != nil {
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return src, nil
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}
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return nil, fmt.Errorf("%w: %s", ErrUnknownTargetType, path)
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}
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func (t *Types) New(uri string) (DocTarget, error) {
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if uri == "" {
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uri = "file://-"
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}
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u, e := url.Parse(uri)
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if u == nil || e != nil {
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return nil, fmt.Errorf("%w: %s", ErrUnknownTargetType, e)
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}
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if u.Scheme == "" {
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u.Scheme = "file"
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}
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path := filepath.Join(u.Hostname(), u.Path)
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if d, lookupErr := t.FromExtension(path); d != nil {
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slog.Info("Target.New", "target", t, "err", lookupErr)
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return d(u), lookupErr
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} else {
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slog.Info("Target.New", "target", t, "err", lookupErr)
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}
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if r, ok := t.registry[u.Scheme]; ok {
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return r(u), nil
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}
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return nil, fmt.Errorf("%w: %s", ErrUnknownTargetType, u.Scheme)
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}
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func (t *Types) Has(typename string) bool {
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if _, ok := t.registry[typename]; ok {
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return true
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}
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return false
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}
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func (t *Types) Get(typename string) TypeFactory {
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if d, ok := t.registry[typename]; ok {
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return d
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}
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return nil
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}
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func (n *TypeName) UnmarshalJSON(b []byte) error {
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TargetTypeName := strings.Trim(string(b), "\"")
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if TargetTypes.Has(TargetTypeName) {
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*n = TypeName(TargetTypeName)
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return nil
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}
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return fmt.Errorf("%w: %s", ErrUnknownTargetType, TargetTypeName)
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}
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