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constraints.go
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/
constraints.go
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package lazyaction
import (
"fmt"
"net/http"
"net/url"
"path"
"reflect"
"strings"
"golazy.dev/lazyaction/internal/args"
"golazy.dev/lazyaction/router"
)
type Constraints struct {
Prefix string // "" means default, "/" means empty
Scheme string
Domain string
Port string
resource *Resource
d *Dispatcher
}
func (c *Constraints) Route(def string, target any) {
if c.d.router == nil {
c.d.router = router.NewRouter[Action]()
}
path := def
method := "GET"
if strings.Contains(def, " ") {
parts := strings.Split(def, " ")
method = parts[0]
path = parts[1]
}
u, err := url.Parse(path)
if err != nil {
panic(err)
}
if c.Scheme != "" {
u.Scheme = c.Scheme
}
if c.Prefix != "" {
if c.Prefix[0] != '/' {
c.Prefix = "/" + c.Prefix
}
if len(c.Prefix) > 2 && c.Prefix[len(c.Prefix)-1] == '/' {
c.Prefix = c.Prefix[:len(c.Prefix)-1]
}
u.Path = c.Prefix + u.Path
}
if c.Domain != "" || c.Port != "" {
host := c.Domain
if host == "" {
host = u.Hostname()
}
port := c.Port
if port == "" {
port = u.Port()
}
if port == "" {
u.Host = host
} else {
u.Host = fmt.Sprintf("%s:%s", host, port)
}
}
action := &Action{
Dispatcher: c.d,
Verb: method,
Assets: c.d.Assets,
URL: *u,
Name: "Annonymous",
Generators: &map[string][]args.Gen{},
}
switch t := target.(type) {
case http.HandlerFunc:
action.handler = t
case http.Handler:
action.handler = t.ServeHTTP
default:
if reflect.ValueOf(t).Kind() == reflect.Func {
action.fn = args.NewFn(t)
break
}
panic(fmt.Sprintf("invalid argument type: %T", t))
}
c.d.router.Add(def, action)
}
func (c *Constraints) updateAction(action *Action) {
action.Dispatcher = c.d
action.Assets = c.d.Assets
u := &action.URL
if c.Scheme != "" {
u.Scheme = c.Scheme
}
if c.Prefix != "" {
if c.Prefix[0] != '/' {
c.Prefix = "/" + c.Prefix
}
if len(c.Prefix) > 2 && c.Prefix[len(c.Prefix)-1] == '/' {
c.Prefix = c.Prefix[:len(c.Prefix)-1]
}
u.Path = c.Prefix + u.Path
}
if c.Domain != "" || c.Port != "" {
host := c.Domain
if host == "" {
host = u.Hostname()
}
port := c.Port
if port == "" {
port = u.Port()
}
if port == "" {
u.Host = host
} else {
u.Host = fmt.Sprintf("%s:%s", host, port)
}
}
}
func (c *Constraints) Memeber() *Constraints {
prefix := "/:id"
if c.resource != nil {
prefix = "/" + c.resource.ParamName
}
c2 := *c
c2.Prefix = c.Prefix + prefix
return &c2
}
func (c *Constraints) Resource(target any, options ...*ResourceOptions) *Constraints {
if c.d.router == nil {
c.d.router = router.NewRouter[Action]()
}
if len(options) == 0 {
options = append(options, &ResourceOptions{})
}
resource, err := newResource(target, options[0])
if err != nil {
panic(err)
}
for _, action := range resource.Actions() {
c.updateAction(action)
c.d.router.Add(action.Verb+" "+action.URL.String(), action)
}
c2 := *c
c2.resource = resource
c2.Prefix = path.Join(c.Prefix, resource.Path, path.Join(resource.Prefix...))
return &c2
}