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extractor.go
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extractor.go
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package axum
import (
"context"
"encoding/json"
"net/http"
"net/url"
"strings"
"github.com/gorilla/schema"
)
type RequestExtractor interface {
Extract(*http.Request) (RequestExtractor, error)
}
// Extension extractor
type Extension[T any] struct {
Value T
}
func (e Extension[T]) Extract(req *http.Request) (RequestExtractor, error) {
return req.Context().Value(Extension[T]{}).(RequestExtractor), nil
}
func (e *Extension[T]) Layer(inner Service) Service {
return ServiceFunc(func(r *http.Request) ResponsePacker {
ctx := context.WithValue(r.Context(), Extension[T]{}, *e)
r = r.WithContext(ctx)
return inner.Handle(r)
})
}
func NewExtension[T any](v T) *Extension[T] {
return &Extension[T]{Value: v}
}
// HeaderMap extractor
type HeaderMap struct {
Value map[string]string
}
func (h HeaderMap) Extract(req *http.Request) (RequestExtractor, error) {
h.Value = make(map[string]string)
for k, vs := range req.Header {
h.Value[k] = strings.Join(vs, ",")
}
return h, nil
}
// Json extractor
type Json[T any] struct {
Value T
}
func (j Json[T]) Extract(req *http.Request) (RequestExtractor, error) {
if err := json.NewDecoder(req.Body).Decode(&j.Value); err != nil {
return nil, err
}
return j, nil
}
// Path extractor
type Path[T any] struct {
Value T
}
func (p Path[T]) Extract(req *http.Request) (RequestExtractor, error) {
params := req.Context().Value(Path[string]{}).(string)
u, err := url.ParseQuery(params)
if err != nil {
return nil, err
}
if err := schema.NewDecoder().Decode(&p.Value, u); err != nil {
return nil, err
}
return p, nil
}
func (p *Path[T]) Layer(inner Service) Service {
return ServiceFunc(func(r *http.Request) ResponsePacker {
ctx := context.WithValue(r.Context(), Path[T]{}, p.Value)
r = r.WithContext(ctx)
return inner.Handle(r)
})
}
func NewPath[T any](v T) *Path[T] {
return &Path[T]{Value: v}
}
// Query extractor
type Query[T any] struct {
Value T
}
func (j Query[T]) Extract(req *http.Request) (RequestExtractor, error) {
if err := req.ParseForm(); err != nil {
return nil, err
}
if err := schema.NewDecoder().Decode(&j.Value, req.Form); err != nil {
return nil, err
}
return j, nil
}
// Request extractor
type Request struct {
Value *http.Request
}
func (r Request) Extract(req *http.Request) (RequestExtractor, error) {
r.Value = req
return r, nil
}