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injector.go
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injector.go
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package axyaserve
import (
"fmt"
"mime"
"net/http"
"net/http/httptest"
"strconv"
"strings"
"github.com/asartalo/go-html-transform/h5"
"github.com/asartalo/go-html-transform/html/transform"
)
type injectorFunc func(string) string
type Injector struct {
original http.Handler
injectors map[string]injectorFunc
}
func NewInjector(original http.Handler) *Injector {
return &Injector{original, make(map[string]injectorFunc)}
}
func (lr *Injector) ServeHTTP(w http.ResponseWriter, r *http.Request) {
var responseContentType string
var newContent string
var contentLength int
wr := httptest.NewRecorder()
fmt.Println("Request: ", r.Method, r.URL)
lr.original.ServeHTTP(wr, r)
content := wr.Body.String()
for key, values := range wr.Header() {
for _, value := range values {
if key == "Content-Type" {
responseContentType = value
}
w.Header().Add(key, value)
}
}
newContent = content
contentType, _, err := mime.ParseMediaType(responseContentType)
if err == nil {
injectorFunc, ok := lr.injectors[contentType]
if ok {
newContent = injectorFunc(string(content))
contentLength = len([]byte(newContent))
cLengthValue := w.Header().Get("Content-Length")
if cLengthValue != "" {
w.Header().Set("Content-Length", strconv.Itoa(contentLength))
}
}
}
w.WriteHeader(wr.Code)
fmt.Println("Response:", wr.Code, contentType)
w.Write([]byte(newContent))
}
func (lr *Injector) Inject(mimetype string, injectionFunc func(string) string) {
lr.injectors[mimetype] = injectionFunc
}
func InjectLiveReload(html string) string {
tree, err := h5.New(strings.NewReader(html))
if err != nil {
return html
}
t := transform.New(tree)
script, _ := h5.PartialFromString("<script src=\"http://localhost:35729/livereload.js\"></script>")
t.Apply(transform.AppendChildren(script...), "body")
return t.String()
}