go-jobscraper/grabber/grabber.go

package grabber

import (
	"fmt"
	"github.com/shomali11/util/xhashes"

	"io"
	"log"
	"net/http"
	"reflect"
	"regexp"

	"github.com/mmcdole/gofeed"
)

var (
	Version       string
	Build         string
	locationRegex = regexp.MustCompile(`Location:<\/strong><\/td><td width="50">&nbsp;<\/td><td>(.*?)(?:<\/td>)`)
	rateRegex     = regexp.MustCompile(`Rate:<\/strong><\/td><td width="50">&nbsp;<\/td><td>(.*?)<\/td>`)
	companyRegex  = regexp.MustCompile(`Advertiser:<\/strong><\/td><td width="50">&nbsp;<\/td><td>(.*?)<\/td>`)
	// accept filter
	acceptRegex = regexp.MustCompile(`(full\s?stack|front\s?end|html|html5|es6|react|angular|knockout|ember|vue|riotjs|css|javascript|typescript|golang|go|sql|node|backbone|git|gulp|jquery|express|£\dk|Data Warehouse Developer|iot|internet of things)\W`)

	// reject filters
	pattRegex       = regexp.MustCompile(`(Simply Education|Splunk|Coordinators?|Teachers?|Technical Writers?|Data Analyst|WebLogic|WebSphere|Data Scientist|Change Managers?|T24|Test Analyst|Insight Analyst|application tester|senior tester|Salesforce|QlikView|Navision|Murex|seo|django|drupal|SHAREPOINT|per annum|ServiceNow|Test Lead|User Researcher|Service Management|\(PERM\)|£\d.K|Remedy|ITSM|Symfony|Zend|Full Time|Technical Business Analyst|BUSINESS ANALYST|AUTOMATION TESTER|FIELD TECHNICIAN|websphere administrator|Research Data Scientist)`)
	engineersRegex  = regexp.MustCompile(`((Support|Devops|Planning|security|Postgresql|network|sccm|test|data|imac|firewall|vmware)\s+Engineer)`)
	developersRegex = regexp.MustCompile(`((Big Data|Java Server Side|Java|PHP|Graduate|Access|Oracle ADF|SHAREPOINT|Ruby on Rails|Java Software|IOS|Qlikview|c#|c\+\+|\.net|bi|go lang|Python)+\s+Developer+)`)
	//	architectsRegex = regexp.MustCompile(`(Java|PHP|Microsoft)+(?:\s)(?=Architect)`)
)

func Grab(url string) []RssItem {
	log.Printf("Grabbing: %v", url)

	// url := "https://www.jobserve.com/MySearch/F3A56475D5FD4966.rss"

	content, err := readFeed(url)
	if err != nil {
		log.Printf("failed to poll feed <%s>: %v", url, err)
		// continue
	}

	items, err := extractItems(content)
	if err != nil {
		log.Printf("Failed to extract items from feed %s: %v", url, err)
		// log.Printf("Failed to extract items from feed %s: %v", feed.url, err)
		// continue
	}

	log.Printf("Length %v\n", len(items))

	items = rejectItems(items)

	log.Printf("Length %v\n", len(items))

	items = acceptItems(items)

	log.Printf("Length %v\n", len(items))

	return items

}

func readFeed(url string) (string, error) {
	resp, err := http.Get(url)
	if err != nil {
		return "", fmt.Errorf("failed to request feed: %v", err)
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return "", fmt.Errorf("failed to read feed: %v", err)
	}

	return string(body), err
}

func showStruct(item any) {
	val := reflect.ValueOf(item)
	typ := val.Type()

	for i := 0; i < val.NumField(); i++ {
		field := val.Field(i)
		fieldType := typ.Field(i)

		fmt.Printf("Field Name: %s, Field Value: %v\n", fieldType.Name, field.Interface())
	}
}

func extractItems(content string) ([]RssItem, error) {
	var items []RssItem

	fp := gofeed.NewParser()

	feed, err := fp.ParseString(content)
	if err != nil {
		return items, fmt.Errorf("Failed to parse feed: %v", err)
	}

	for _, item := range feed.Items {

		var ri RssItem
		ri.Title = item.Title
		if item.PublishedParsed != nil {
			ri.Date = *item.PublishedParsed
		}

		if item.GUID != "" {
			// ri.Id = item.GUID
			ri.Id = xhashes.SHA1(item.GUID)
		}

		if item.Description != "" {
			ri.Summary = item.Description
		}
		ri.URL = item.Link

		ri = additionalProcessing(ri)

		items = append(items, ri)
	}

	return items, nil
}

func additionalProcessing(workItem RssItem) RssItem {

	if loc := locationRegex.FindStringSubmatch(workItem.Summary); loc != nil {

		workItem.Location = loc[1]
	}

	if rate := rateRegex.FindStringSubmatch(workItem.Summary); rate != nil {

		workItem.Salary = rate[1]
	}

	if company := companyRegex.FindStringSubmatch(workItem.Summary); company != nil {
		workItem.Company = company[1]
	}

	return workItem

}

func acceptItems(jobitems []RssItem) []RssItem {

	var items []RssItem

	for _, item := range jobitems {

		var accept []string

		acceptable := false

		if pat := acceptRegex.FindStringSubmatch(item.Title); pat != nil {

			accept = append(accept, pat[0])

			acceptable = true
		}

		if pat := acceptRegex.FindStringSubmatch(item.Summary); pat != nil {

			accept = append(accept, pat[0])
			acceptable = true
		}

		log.Printf("%v :: Accept? %v -- %v", item.Title, acceptable, accept)

		if acceptable == true {

			items = append(items, item)

		}

	}

	return items
}

func rejectItems(jobitems []RssItem) []RssItem {

	var items []RssItem

	for _, item := range jobitems {

		var rejected []string

		rejectable := false

		if pat := pattRegex.FindStringSubmatch(item.Title); pat != nil {
			rejected = append(rejected, pat[0])
			rejectable = true
		}

		if pat := pattRegex.FindStringSubmatch(item.Summary); pat != nil {
			rejected = append(rejected, pat[0])
			rejectable = true
		}

		if pat := engineersRegex.FindStringSubmatch(item.Title); pat != nil {
			rejected = append(rejected, pat[0])
			rejectable = true
		}

		if pat := engineersRegex.FindStringSubmatch(item.Summary); pat != nil {
			rejected = append(rejected, pat[0])
			rejectable = true
		}

		if pat := developersRegex.FindStringSubmatch(item.Title); pat != nil {
			rejected = append(rejected, pat[0])
			rejectable = true
		}

		if pat := developersRegex.FindStringSubmatch(item.Summary); pat != nil {
			rejected = append(rejected, pat[0])
			rejectable = true
		}

		log.Printf("%v :: Reject? %v -- %v", item.Title, rejectable, rejected)

		if rejectable == false {

			items = append(items, item)

		}

	}

	return items
}