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fetch.go
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fetch.go
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package fetch
import (
"bytes"
"encoding/json"
"errors"
"net/http"
"net/http/httptest"
"net/textproto"
"strings"
"github.com/parnurzeal/gorequest"
"gopkg.in/olebedev/go-duktape.v2"
)
var bundle string
func init() {
b, err := Asset("dist/bundle.js")
must(err)
bundle = string(b)
}
func PushGlobal(c *duktape.Context, server http.Handler) {
c.PushTimers()
must(c.PevalString(bundle))
c.Pop()
c.PushGlobalObject()
c.GetPropString(-1, "fetch")
c.PushGoFunction(goFetchSync(server))
c.PutPropString(-2, "goFetchSync")
c.Pop2()
}
type options struct {
Url string `json:"url"`
Method string `json:"method"`
Headers http.Header `json:"headers"`
Body string `json:"body"`
}
func goFetchSync(server http.Handler) func(*duktape.Context) int {
return func(c *duktape.Context) int {
url := c.SafeToString(0)
opts := options{
Method: gorequest.GET,
Headers: http.Header{},
}
err := json.Unmarshal([]byte(c.JsonEncode(1)), &opts)
must(err)
// Normalize headers' keys.
// It could be in lower-case, which is invalid.
// For more details see: https://golang.org/pkg/net/textproto/#CanonicalMIMEHeaderKey.
prev := opts.Headers
opts.Headers = http.Header{}
for k, v := range prev {
opts.Headers[textproto.CanonicalMIMEHeaderKey(k)] = v
}
var resp response
if strings.HasPrefix(url, "http") || strings.HasPrefix(url, "//") {
resp = fetchHttp(url, opts)
} else if strings.HasPrefix(url, "/") {
resp = fetchHandlerFunc(server, url, opts)
} else {
return duktape.ErrRetURI
}
j, err := json.MarshalIndent(resp, "", " ")
must(err)
c.Pop3()
c.PushString(string(j))
c.JsonDecode(-1)
return 1
}
}
type response struct {
options
Status int `json:"status"`
StatusText string `json:"statusText,omitempty"`
Errors []error `json:"errors"`
}
func fetchHttp(url string, opts options) response {
var resp gorequest.Response
var body string
var errs []error
client := gorequest.New()
switch opts.Method {
case gorequest.HEAD:
resp, body, errs = client.Head(url).End()
case gorequest.GET:
resp, body, errs = client.Get(url).End()
case gorequest.POST:
resp, body, errs = client.Post(url).Query(opts.Body).End()
case gorequest.PUT:
resp, body, errs = client.Put(url).Query(opts.Body).End()
case gorequest.PATCH:
resp, body, errs = client.Patch(url).Query(opts.Body).End()
case gorequest.DELETE:
resp, body, errs = client.Delete(url).End()
}
result := response{
options: opts,
Status: resp.StatusCode,
StatusText: resp.Status,
Errors: errs,
}
result.Body = body
result.Headers = resp.Header
return result
}
func fetchHandlerFunc(server http.Handler, url string, opts options) response {
result := response{
options: opts,
Errors: []error{},
}
if server == nil {
result.Errors = append(result.Errors, errors.New("`http.Handler` isn't set yet"))
result.Status = http.StatusInternalServerError
}
b := bytes.NewBufferString(opts.Body)
res := httptest.NewRecorder()
req, err := http.NewRequest(opts.Method, url, b)
if err != nil {
result.Errors = []error{err}
return result
}
req.Header = opts.Headers
server.ServeHTTP(res, req)
result.Status = res.Code
result.Headers = res.Header()
result.Body = res.Body.String()
return result
}
func must(err error) {
if err != nil {
panic(err)
}
}