cookiejarparser

cookiejarparser

cookiejarparser is a Go library that parses a curl (netscape) cookiejar file into a Go http.CookieJar.

Usage

Assuming you have a netscape/curl style cookie jar made with something like:

$ curl -c cookies.txt -v https://github.com

That cookiejar can be used when making a web request using the following code:

package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"net/http"

	"github.com/ssgelm/cookiejarparser"
)

func main() {
	cookies, err := cookiejarparser.LoadCookieJarFile("cookies.txt")
	if err != nil {
		log.Fatal(err)
	}

	client := &http.Client{
		Jar: cookies,
	}
	resp, err := client.Get("https://github.com")
	if err != nil {
		log.Fatal(err)
	}
	defer resp.Body.Close()
	respData, err := ioutil.ReadAll(resp.Body)
	fmt.Println(string(respData))
}

Malformed lines

By default LoadCookieJarFile stops at the first line it cannot parse and returns an error naming that line:

incorrect number of fields in line 4.  Expected 6 or 7, got 4.

To skip malformed lines instead and keep whatever else the file contains, pass WithLenient:

cookies, err := cookiejarparser.LoadCookieJarFile("cookies.txt",
	cookiejarparser.WithLenient())

Lenient mode drops those lines without telling you. To see them, add WithMalformedLineHandler:

cookies, err := cookiejarparser.LoadCookieJarFile("cookies.txt",
	cookiejarparser.WithLenient(),
	cookiejarparser.WithMalformedLineHandler(func(lineNum int, err error) {
		log.Printf("skipping line %d: %v", lineNum, err)
	}))

Lenient mode covers lines that fail to parse. If LoadCookieJarFile cannot read the file at all it still returns an error, since that leaves the cookie jar truncated at an arbitrary point.

License

MIT