go-duktape-fetch's Introduction

go-duktape-fetch

Fetch polyfill for go-duktape.

Usage

First of all install the package go get gopkg.in/olebedev/go-duktape-fetch.v2.

package main

import (
  "fmt"

  "gopkg.in/olebedev/go-duktape.v2"
  "gopkg.in/olebedev/go-duktape-fetch.v2"
)

func main() {
  // create an ecmascript context
  ctx := duktape.New()
  // push fetch into the global scope
  fetch.PushGlobal(ctx, nil)
  ch := make(chan string)
  ctx.PushGlobalGoFunction("cbk", func(c *duktape.Context) int {
    ch <- c.SafeToString(-1)
    return 0
  })
  // make a request
  ctx.PevalString(`
    fetch('http://ya.ru').then(function(resp) {
      return resp.text();
    }).then(function(body) {
      // release channel
      cbk(body.slice(0, 15));
    });
  `)
  // print head line of the response body
  fmt.Println(<-ch)
}

This program will prodice <!DOCTYPE html> into stdout.

Also you can define fetch with some other good possibilities. In particular you can specify local http instance with http.Handler interface as a the second parameter. It will be used for all local requests which url starts with /(single slash). See tests for more detail.

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go-duktape-fetch's Issues

error after go get

I got this error after go getting the package

$ go get gopkg.in/olebedev/go-duktape-fetch.v2

../../../gopkg.in/olebedev/go-duktape.v2/duktape.go:83: constant 18446744073709551615 overflows int

go version: go version go1.9 darwin/amd64

Migration to Duktape 1.3

Waiting for olebedev/go-duktape#28

Options variable is undefined

The options variable here should be o which is defined as an argument to Fetch

Doesn't work with authenticated sessions using cookies

server side fetch doesn't work well with session based authentication middlewares. The remote addr, as well some other request parameters, is not passed, hence most session based middlewares cannot validate the session.

The alternative for making authenticated server calls seems to be to use a jwt which seems redundant.

Any thoughts?

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