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package toolbox
import (
"fmt"
"net/url"
"os"
"path/filepath"
"strings"
)
//ExtractURIParameters parses URIs to extract {<param>} defined in templateURI from requestURI, it returns extracted parameters and flag if requestURI matched templateURI
func ExtractURIParameters(templateURI, requestURI string) (map[string]string, bool) {
var expectingValue, expectingName bool
var name, value string
var uriParameters = make(map[string]string)
maxLength := len(templateURI) + len(requestURI)
var requestURIIndex, templateURIIndex int
questionMarkPosition := strings.Index(requestURI, "?")
if questionMarkPosition != -1 {
requestURI = string(requestURI[:questionMarkPosition])
}
for k := 0; k < maxLength; k++ {
var requestChar, routingChar string
if requestURIIndex < len(requestURI) {
requestChar = requestURI[requestURIIndex : requestURIIndex+1]
}
if templateURIIndex < len(templateURI) {
routingChar = templateURI[templateURIIndex : templateURIIndex+1]
}
if (!expectingValue && !expectingName) && requestChar == routingChar && routingChar != "" {
requestURIIndex++
templateURIIndex++
continue
}
if routingChar == "}" {
expectingName = false
templateURIIndex++
}
if expectingValue && requestChar == "/" {
expectingValue = false
}
if expectingName && templateURIIndex < len(templateURI) {
name += routingChar
templateURIIndex++
}
if routingChar == "{" {
expectingValue = true
expectingName = true
templateURIIndex++
}
if expectingValue && requestURIIndex < len(requestURI) {
value += requestChar
requestURIIndex++
}
if !expectingValue && !expectingName && len(name) > 0 {
uriParameters[name] = value
name = ""
value = ""
}
}
if len(name) > 0 && len(value) > 0 {
uriParameters[name] = value
}
matched := requestURIIndex == len(requestURI) && templateURIIndex == len(templateURI)
return uriParameters, matched
}
//URLStripPath removes path from URL
func URLStripPath(URL string) string {
protoIndex := strings.Index(URL, "://")
if protoIndex != -1 {
pathIndex := strings.Index(string(URL[protoIndex+3:]), "/")
if pathIndex != -1 {
return string(URL[:protoIndex+3+pathIndex])
}
}
return URL
}
//URLPathJoin joins URL paths
func URLPathJoin(baseURL, path string) string {
if path == "" {
return baseURL
}
if strings.HasPrefix(path, "/") {
return URLStripPath(baseURL) + path
}
if !strings.HasSuffix(baseURL, "/") {
baseURL += "/"
}
return baseURL + path
}
//URLBase returns base URL
func URLBase(URL string) string {
parsedURL, err := url.Parse(URL)
if err != nil || parsedURL.Path == "" {
return URL
}
pathPosition := strings.Index(URL, parsedURL.Path)
if pathPosition == -1 {
return URL
}
return string(URL[:pathPosition])
}
//URLSplit returns URL with parent path and resource name
func URLSplit(URL string) (string, string) {
parsedURL, err := url.Parse(URL)
if err != nil || parsedURL.Path == "" {
return URL, ""
}
splitPosition := strings.LastIndex(parsedURL.Path, "/")
if splitPosition == -1 {
return URL, ""
}
return fmt.Sprintf("%v%v", URLBase(URL), string(parsedURL.Path[:splitPosition])), string(parsedURL.Path[splitPosition+1:])
}
//Filename reformat file name
func Filename(filename string) string {
if strings.Contains(filename, ":/") {
if parsed, err := url.Parse(filename); err == nil {
filename = parsed.Path
}
}
var root = make([]string, 0)
if strings.HasPrefix(filename, "/") {
root = append(root, "/")
}
elements := append(root, strings.Split(filename, "/")...)
filename = filepath.Join(elements...)
return filename
}
//OpenFile open file converting path to elements and rebuling path safety with path.Join
func OpenFile(filename string) (*os.File, error) {
var file = Filename(filename)
var result, err = os.Open(file)
return result, err
}
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