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main.go
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main.go
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package main
import (
"bufio"
"flag"
"fmt"
"net/url"
"os"
"sort"
"strings"
)
func main() {
var newValue string
flag.StringVar(&newValue, "v", "", "Value to modify the parameters upon")
var addParam string
flag.StringVar(&addParam, "a", "", "Add custom parameters to the URLs, comma separated")
var rmParam string
flag.StringVar(&rmParam, "r", "", "Remove parameters from the URLs, comma separated")
var overrideMode bool
flag.BoolVar(&overrideMode, "o", false, "Replace the value instead of appending")
var multiMode bool
flag.BoolVar(&multiMode, "m", false, "Modify all parameters at once")
var decodeMode bool
flag.BoolVar(&decodeMode, "d", false, "URLdecode the values of the parameters")
var keepAllUrls bool
flag.BoolVar(&keepAllUrls, "k", false, "Keep the URLs with no parameters")
flag.Parse()
seen := make(map[string]bool)
// read URLs on stdin, then modify the values in the query string with some user-provided value
sc := bufio.NewScanner(os.Stdin)
for sc.Scan() {
u, err := url.Parse(sc.Text())
if err != nil {
fmt.Fprintf(os.Stderr, "failed to parse url %s [%s]\n", sc.Text(), err)
continue
}
// Remove parameters from the URL if the `r` flag is specified
delParams := strings.Split(rmParam, ",")
if u.RawQuery != "" && rmParam != "" {
qs := u.Query()
for _, param := range delParams {
if _, exists := qs[param]; exists {
// The parameter exists, so delete it
delete(qs, param)
}
}
// Rebuild the query string without the deleted parameter(s)
u.RawQuery = ""
for p, v := range qs {
u.RawQuery += p
if v[0] != "" {
u.RawQuery += "=" + v[0]
}
u.RawQuery += "&"
}
// Trim the trailing ampersand
if u.RawQuery != "" {
u.RawQuery = u.RawQuery[:len(u.RawQuery)-1]
}
if decodeMode {
u.RawQuery, _ = url.QueryUnescape(u.RawQuery)
}
}
// Add parameters to the URL if the `a` flag is specified
newParams := strings.Split(addParam, ",")
if addParam != "" {
for _, param := range newParams {
if u.RawQuery == "" {
// No parameters in the URL, so just add the new parameter
u.RawQuery = param + "=" + newValue
} else {
// There are already parameters in the URL, so check if the specified parameter exists
qs := u.Query()
if _, exists := qs[param]; !exists {
// The parameter doesn't exist, so add it
qs.Set(param, newValue)
u.RawQuery = qs.Encode()
if decodeMode {
u.RawQuery, _ = url.QueryUnescape(u.RawQuery)
}
}
}
}
}
param := make([]string, 0)
for p, _ := range u.Query() {
param = append(param, p)
}
sort.Strings(param)
key := fmt.Sprintf("%s%s?%s", u.Hostname(), u.EscapedPath(), strings.Join(param, "&"))
// Only output each host + path + newParams combination once
if _, exists := seen[key]; exists {
continue
}
seen[key] = true
if multiMode {
qs := url.Values{}
for p, val := range u.Query() {
if overrideMode {
qs.Set(p, newValue)
} else {
if (p != addParam) {
qs.Set(p, val[0]+newValue)
} else {
qs.Set(p, newValue)
}
}
}
u.RawQuery = qs.Encode()
if decodeMode {
u.RawQuery, _ = url.QueryUnescape(u.RawQuery)
}
if !(u.RawQuery == "") || keepAllUrls {
w := bufio.NewWriter(os.Stdout)
fmt.Fprintln(w, u)
w.Flush()
}
} else {
// Save the original URL
originalURL := u.String()
lastUrl := ""
for i, _ := range param {
// Restore the original URL
u, _ = url.Parse(originalURL)
qs := url.Values{}
for j, p := range param {
if i == j {
if overrideMode {
qs.Set(p, newValue)
} else {
if (u.Query().Get(p) != newValue) {
qs.Set(p, u.Query().Get(p)+newValue)
} else {
qs.Set(p, newValue)
}
}
} else {
qs.Set(p, u.Query().Get(p))
}
}
u.RawQuery = qs.Encode()
if decodeMode {
u.RawQuery, _ = url.QueryUnescape(u.RawQuery)
}
// Make sure no duplicates
if lastUrl != u.String() {
w := bufio.NewWriter(os.Stdout)
fmt.Fprintln(w, u)
w.Flush()
}
lastUrl = u.String()
}
if keepAllUrls && (u.RawQuery == "") {
w := bufio.NewWriter(os.Stdout)
fmt.Fprintln(w, u)
w.Flush()
}
}
}
}