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util.go
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util.go
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package main
import (
"bytes"
"errors"
"fmt"
"io/ioutil"
"log"
"math/rand"
"net/http"
"regexp"
"strings"
"time"
)
func extractListingID(url string) string {
re := regexp.MustCompile("/rooms/([0-9]+)")
match := re.FindStringSubmatch(url)
if len(match) > 0 {
return match[1]
}
return ""
}
var baseURL = "https://www.airbnb.com.au/api/v2"
var apiKey string
func makeAPIQueryGET(url string, params []string) []byte {
url = addQueryStringsToURL(baseURL+"/"+url, append(
append([]string{"key=" + apiKey}, params...),
))
if debug {
log.Println("Attempting a GET to: " + url)
}
req := getNewGETRequest(url)
responseBody := getResponseBody(*req)
// if debug {
// log.Println("RESPONSE BODY:")
// fmt.Println(string(responseBody))
// }
return responseBody
}
func makeAPIQueryPOST(url string, params []string) []byte {
url = addQueryStringsToURL(baseURL+"/"+url, append(
append([]string{"key=" + apiKey}, params...),
))
if debug {
log.Println("Attempting a POST to: " + url)
}
req := getNewPOSTRequest(url)
responseBody := getResponseBody(*req)
if debug {
log.Println("RESPONSE BODY:")
fmt.Println(string(responseBody))
}
return responseBody
}
func addQueryStringsToURL(url string, params []string) string {
var buffer bytes.Buffer
buffer.WriteString(url)
if len(params) > 0 {
var separator string
for index, param := range params {
if index == 0 {
separator = "?"
} else {
separator = "&"
}
buffer.WriteString(separator + param)
}
}
return buffer.String()
}
func getRandomUserAgent() string {
userAgents := []string{
fmt.Sprintf(
"%s %s",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko)",
"Ubuntu Chromium/71.0.3578.98 Chrome/74.0.3729.131 Safari/537.36",
),
fmt.Sprintf(
"%s %s",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
"(KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36",
),
fmt.Sprintf(
"%s %s",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/537.36",
"(KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36",
),
}
return userAgents[rand.Intn(len(userAgents))]
}
func getNewGETRequest(url string) *http.Request {
req, err := http.NewRequest("GET", url, nil)
errExit(err)
req.Header.Set("X-Airbnb-API-Key", apiKey)
req.Header.Set("User-Agent", getRandomUserAgent())
return req
}
func getNewPOSTRequest(url string) *http.Request {
req, err := http.NewRequest("POST", url, nil)
errExit(err)
req.Header.Set("X-Airbnb-API-Key", apiKey)
req.Header.Set("User-Agent", getRandomUserAgent())
return req
}
func requestUntilSuccess(req *http.Request) (*http.Response, error) {
retryCount := 0
retryLimit := 15
retrySleepMin := 500
retrySleepMax := 2500
client := &http.Client{}
resp, err := client.Do(req)
for resp.StatusCode != 200 {
rand.Seed(time.Now().UnixNano())
if retryCount > retryLimit {
break
}
if debug {
log.Println("Response Code:", resp.StatusCode)
}
retryCount++
sleepDur := time.Duration(
rand.Intn(retrySleepMax-retrySleepMin)+retrySleepMin,
) * time.Millisecond
if debug {
log.Println("Waiting for", sleepDur)
}
time.Sleep(sleepDur)
resp, err = client.Do(req)
}
return resp, err
}
func getResponseBody(req http.Request) []byte {
rand.Seed(time.Now().Unix())
resp, err := requestUntilSuccess(&req)
if resp.StatusCode != 200 {
errExit(errors.New("Unable to get listing information"))
}
errExit(err)
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
errExit(err)
return body
}
func amenityExists(amenityList []ListingAmenity, needle string) bool {
for _, amenity := range amenityList {
stringsMatch := strings.ToLower(amenity.Name) == strings.ToLower(needle)
if stringsMatch && amenity.IsPresent {
return true
}
}
return false
}
func errExit(err error) {
if err != nil {
log.Fatalln(err)
}
}