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Kasianov Nikolai Alekseevich 2 years ago
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  1. 6
      .gitignore
  2. 661
      COPYING
  3. 15
      Makefile
  4. 32
      README.md
  5. 147
      src/config/config.go
  6. 5
      src/go.mod
  7. 2
      src/go.sum
  8. 66
      src/logger/logger.go
  9. 284
      src/main.go
  10. 93
      src/web/images.go
  11. 27
      src/web/job.go
  12. 47
      src/web/requests.go
  13. 27
      src/web/result.go
  14. 86
      src/web/text.go
  15. 82
      src/worker/pool.go
  16. 236
      src/worker/worker.go

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testing/
conf.json
logs.log
output.json
websurf
conf_mega_ita.json

661
COPYING
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GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The GNU Affero General Public License is a free, copyleft license for
software and other kinds of works, specifically designed to ensure
cooperation with the community in the case of network server software.
The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
our General Public Licenses are intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
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Developers that use our General Public Licenses protect your rights
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software used on network servers, this result may fail to come about.
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network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

15
Makefile
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SRCDIR:=src
EXE:=websurf
TESTDIR:=testing
all:
cd $(SRCDIR) && go build && mv $(EXE) ..
test: all
rm -rf $(TESTDIR) && \
mkdir -p $(TESTDIR) && \
cp $(EXE) $(TESTDIR) && \
cp conf.json $(TESTDIR)
clean:
rm -rf $(TESTDIR) $(EXE)

32
README.md
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# Websurf
## Overview
Just a simple HTML web spider with minimal dependencies. It is possible to search for pages with a text on them or for the text itself, extract images and save pages that satisfy the criteria along the way.
## Configuration
The flow of work fully depends on the configuration file. By default `conf.json` is used as a configuration file, but the name can be changed via `-conf` flag. The default configuration is embedded in the program so on the first launch or by simply deleting the file, a new `conf.json` will be created in the same directory as the executable itself unless the `wDir` (working directory) flag is set to some other value.
The configuration is split into different branches like `requests` (how requests are made, ie: request timeout, wait time, user agent), `logging` (use logs, output to a file), `save` (output file|directory, save pages or not) or `search` (use regexp, query string) each of which contain tweakable parameters. There are global ones as well such as `workers` (working threads that make requests in parallel) and `depth` (literally, how deep the recursive search should go). The names are simple and self-explanatory so no attribute-by-attribute explanation needed for most of them.
### Search query
if `is_regexp` is `false`, then `query` is the text to be searched for, but there are some special values:
- `links` - tells `webscrape` to search for all links there are on the page
- `images` - find all image links and output to the `output_dir`
When `is_regexp` is enabled, the `query` is treated as a regexp string and pages will be scanned for matches that satisfy it.
### Output
By default, if the query is not `images` all the matches and other data will be outputted to `output.json` file as separate continuous JSON objects, but if `save_pages` is set to `true` and|or `query` is set to `images` - the additional contents will be put in the `output_dir` directory neatly created by the executable's side.
## TODO
- **PARSE HTML WITH REGEXP (_EVIL LAUGH_)**
## License
AGPLv3

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src/config/config.go
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/*
websurf - surf the web for data recursively
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package config
import (
"encoding/json"
"io"
"os"
)
const (
QueryLinks string = "links"
QueryImages string = "images"
)
type Search struct {
IsRegexp bool `json:"is_regexp"`
Query string `json:"query"`
}
type Save struct {
OutputDir string `json:"output_dir"`
OutputFile string `json:"save_file"`
SavePages bool `json:"save_pages"`
}
type Requests struct {
WaitTimeoutMs uint64 `json:"wait_timeout_ms"`
RequestPauseMs uint64 `json:"request_pause_ms"`
UserAgent string `json:"user_agent"`
}
type Logging struct {
OutputLogs bool `json:"output_logs"`
LogsFile string `json:"logs_file"`
}
type Conf struct {
Search Search `json:"search"`
Requests Requests `json:"requests"`
Depth uint `json:"depth"`
Workers uint `json:"workers"`
InitialDomains []string `json:"initial_domains"`
Save Save `json:"save"`
Logging Logging `json:"logging"`
}
func Default() *Conf {
return &Conf{
Search: Search{
IsRegexp: false,
Query: "",
},
Save: Save{
OutputDir: "scraped",
SavePages: false,
OutputFile: "scraped.json",
},
Requests: Requests{
UserAgent: "",
WaitTimeoutMs: 1500,
RequestPauseMs: 100,
},
InitialDomains: []string{""},
Depth: 5,
Workers: 20,
Logging: Logging{
OutputLogs: true,
LogsFile: "logs.log",
},
}
}
func (c *Conf) WriteTo(w io.Writer) error {
jsonData, err := json.MarshalIndent(c, "", " ")
if err != nil {
return err
}
_, err = w.Write(jsonData)
if err != nil {
return err
}
return nil
}
func (c *Conf) ReadFrom(r io.Reader) error {
jsonData, err := io.ReadAll(r)
if err != nil {
return nil
}
err = json.Unmarshal(jsonData, c)
if err != nil {
return err
}
return nil
}
func CreateConfigFile(conf Conf, path string) error {
confFile, err := os.Create(path)
if err != nil {
return err
}
defer confFile.Close()
err = conf.WriteTo(confFile)
if err != nil {
return err
}
return nil
}
func OpenConfigFile(path string) (*Conf, error) {
confFile, err := os.Open(path)
if err != nil {
return Default(), err
}
defer confFile.Close()
var conf Conf
err = conf.ReadFrom(confFile)
if err != nil {
return Default(), err
}
return &conf, nil
}

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src/go.mod
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module unbewohnte/websurf
go 1.18
require golang.org/x/net v0.4.0

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src/go.sum
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golang.org/x/net v0.4.0 h1:Q5QPcMlvfxFTAPV0+07Xz/MpK9NTXu2VDUuy0FeMfaU=
golang.org/x/net v0.4.0/go.mod h1:MBQ8lrhLObU/6UmLb4fmbmk5OcyYmqtbGd/9yIeKjEE=

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src/logger/logger.go
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/*
websurf - surf the web for data recursively
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package logger
import (
"io"
"log"
"os"
)
// 3 basic loggers in global space
var (
// neutral information logger
infoLog *log.Logger
// warning-level information logger
warningLog *log.Logger
// error-level information logger
errorLog *log.Logger
)
func init() {
infoLog = log.New(os.Stdout, "[INFO] ", log.Ldate|log.Ltime)
warningLog = log.New(os.Stdout, "[WARNING] ", log.Ldate|log.Ltime)
errorLog = log.New(os.Stdout, "[ERROR] ", log.Ldate|log.Ltime)
}
// Set up loggers to write to the given writer
func SetOutput(writer io.Writer) {
if writer == nil {
writer = io.Discard
}
infoLog.SetOutput(writer)
warningLog.SetOutput(writer)
errorLog.SetOutput(writer)
}
// Log information
func Info(format string, a ...interface{}) {
infoLog.Printf(format, a...)
}
// Log warning
func Warning(format string, a ...interface{}) {
warningLog.Printf(format, a...)
}
// Log error
func Error(format string, a ...interface{}) {
errorLog.Printf(format, a...)
}

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src/main.go
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/*
websurf - surf the web for data recursively
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"encoding/json"
"flag"
"fmt"
"io"
"log"
"os"
"os/signal"
"path/filepath"
"time"
"unbewohnte/websurf/config"
"unbewohnte/websurf/logger"
"unbewohnte/websurf/web"
"unbewohnte/websurf/worker"
)
const (
defaultConfigFile string = "conf.json"
defaultOutputFile string = "output.json"
)
var (
version = flag.Bool(
"version", false,
"Print version and exit",
)
wDir = flag.String(
"wdir", "",
"Force set working directory",
)
configFile = flag.String(
"conf", defaultConfigFile,
"Configuration file name to create|look for",
)
outputFile = flag.String(
"out", defaultOutputFile,
"Output file name to output information into",
)
workingDirectory string
configFilePath string
outputFilePath string
)
func init() {
// set log output
logger.SetOutput(os.Stdout)
// and work around random log prints by /x/net library
log.SetOutput(io.Discard)
log.SetFlags(0)
// parse and process flags
flag.Parse()
if *version {
fmt.Printf(
"webscrape - scrape the web\n(c) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)\n\n",
)
os.Exit(0)
}
// work out working directory path
if *wDir != "" {
workingDirectory = *wDir
} else {
exePath, err := os.Executable()
if err != nil {
logger.Error("Failed to determine executable's path: %s", err)
return
}
workingDirectory = filepath.Dir(exePath)
}
logger.Info("Working in \"%s\"", workingDirectory)
// global path to configuration file
configFilePath = filepath.Join(workingDirectory, *configFile)
// global path to output file
outputFilePath = filepath.Join(workingDirectory, *outputFile)
}
func main() {
// open config
logger.Info("Trying to open config \"%s\"", configFilePath)
var conf *config.Conf
conf, err := config.OpenConfigFile(configFilePath)
if err != nil {
logger.Error(
"Failed to open configuration file: %s. Creating a new one with the same name instead...",
err,
)
err = config.CreateConfigFile(*config.Default(), configFilePath)
if err != nil {
logger.Error("Could not create new configuration file: %s", err)
return
}
logger.Info("Created new configuration file. Exiting...")
return
}
logger.Info("Successfully opened configuration file")
// create logs if needed
if conf.Logging.OutputLogs {
if conf.Logging.LogsFile != "" {
// output logs to a file
logFile, err := os.Create(filepath.Join(workingDirectory, conf.Logging.LogsFile))
if err != nil {
logger.Error("Failed to create logs file: %s", err)
return
}
defer logFile.Close()
logger.Info("Outputting logs to %s", conf.Logging.LogsFile)
logger.SetOutput(logFile)
} else {
// output logs to stdout
logger.Info("Outputting logs to stdout")
logger.SetOutput(os.Stdout)
}
} else {
// no logging needed
logger.Info("No logs will be outputted")
logger.SetOutput(nil)
}
// sanitize and correct inputs
if len(conf.InitialDomains) == 0 {
logger.Warning("No initial domain URLs have been set")
return
} else if len(conf.InitialDomains) != 0 && conf.InitialDomains[0] == "" {
logger.Warning("No initial domain URLs have been set")
return
}
if conf.Depth <= 0 {
conf.Depth = 1
logger.Warning("Depth is <= 0. Set to %d", conf.Depth)
}
if conf.Workers <= 0 {
conf.Workers = 5
logger.Warning("Workers number is <= 0. Set to %d", conf.Workers)
}
if conf.Search.Query == "" {
logger.Warning("Search query has not been set")
return
}
if conf.Requests.UserAgent == "" {
conf.Requests.UserAgent = "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:47.0) Gecko/20100101 Firefox/47.0"
logger.Warning("User agent is not set. Forced to \"%s\"", conf.Requests.UserAgent)
}
if !filepath.IsAbs(conf.Save.OutputDir) {
conf.Save.OutputDir = filepath.Join(workingDirectory, conf.Save.OutputDir)
}
err = os.MkdirAll(conf.Save.OutputDir, os.ModePerm)
if err != nil {
logger.Error("Failed to create output directory: %s", err)
return
}
switch conf.Search.Query {
case config.QueryLinks:
logger.Info("Looking for links")
case config.QueryImages:
logger.Info("Looking for images")
default:
if conf.Search.IsRegexp {
logger.Info("Looking for RegExp matches (%s)", conf.Search.Query)
} else {
logger.Info("Looking for text matches (%s)", conf.Search.Query)
}
}
// create output file
outputFile, err := os.Create(outputFilePath)
if err != nil {
logger.Error("Failed to create output file: %s", err)
return
}
defer outputFile.Close()
// prepare channels
jobs := make(chan web.Job, conf.Workers*5)
results := make(chan web.Result, conf.Workers*5)
// create initial jobs
for _, initialDomain := range conf.InitialDomains {
jobs <- web.Job{
URL: initialDomain,
Search: conf.Search,
Depth: conf.Depth,
}
}
// form a worker pool
workerPool := worker.NewWorkerPool(jobs, results, conf.Workers, worker.WorkerConf{
Requests: conf.Requests,
Save: conf.Save,
})
logger.Info("Created a worker pool with %d workers", conf.Workers)
// set up graceful shutdown
sig := make(chan os.Signal, 1)
signal.Notify(sig, os.Interrupt)
go func() {
<-sig
logger.Info("Received interrupt signal. Exiting...")
// stop workers
workerPool.Stop()
// close results channel
close(results)
}()
// launch concurrent scraping !
workerPool.Work()
logger.Info("Started scraping...")
// if logs are not used or are printed to the file - output a nice statistics message on the screen
if !conf.Logging.OutputLogs || (conf.Logging.OutputLogs && conf.Logging.LogsFile != "") {
go func() {
fmt.Printf("\n")
for {
time.Sleep(time.Second)
timeSince := time.Since(workerPool.Stats.StartTime).Round(time.Second)
fmt.Fprintf(os.Stdout, "\r[%s] %d pages; %d matches (%d pages/sec)",
timeSince.String(),
workerPool.Stats.PagesVisited,
workerPool.Stats.MatchesFound,
workerPool.Stats.PagesVisited/uint64(timeSince.Seconds()),
)
}
}()
}
// get results and write them to the output file
for {
result, ok := <-results
if !ok {
break
}
entryBytes, err := json.MarshalIndent(result, "", " ")
if err != nil {
continue
}
outputFile.Write(entryBytes)
outputFile.Write([]byte("\n"))
}
}

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src/web/images.go
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/*
websurf - surf the web for data recursively
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package web
import (
"bytes"
"net/url"
"strings"
"unbewohnte/websurf/logger"
"golang.org/x/net/html"
)
func hasImageExtention(url string) bool {
var extentions []string = []string{
".jpeg",
".jpg",
".jpe",
".png",
".ppm",
".svg",
}
for _, extention := range extentions {
if strings.HasSuffix(url, extention) {
return true
}
}
return false
}
// Tries to find images' URLs on the page
func FindPageImages(pageBody []byte, hostname string) []string {
var urls []string
tokenizer := html.NewTokenizer(bytes.NewReader(pageBody))
for {
tokenType := tokenizer.Next()
switch tokenType {
case html.ErrorToken:
return urls
case html.StartTagToken:
token := tokenizer.Token()
if token.Data != "img" && token.Data != "a" {
continue
}
// recheck
for _, attribute := range token.Attr {
if attribute.Key != "src" && attribute.Key != "href" {
continue
}
var imageURLString string
imageURL, err := url.Parse(attribute.Val)
if err != nil {
logger.Error("Failed to parse URL %s: %s", attribute.Val, err)
continue
}
imageURLString = imageURL.String()
if strings.HasPrefix(imageURLString, "//") {
imageURLString = "http:" + imageURLString
}
if hasImageExtention(imageURLString) {
urls = append(urls, imageURLString)
}
}
}
}
}

27
src/web/job.go
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/*
websurf - surf the web for data recursively
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package web
import "unbewohnte/websurf/config"
type Job struct {
URL string
Search config.Search
Depth uint
}

47
src/web/requests.go
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/*
websurf - surf the web for data recursively
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package web
import (
"io"
"net/http"
"time"
)
func GetPage(url string, userAgent string, timeOutMs uint64) ([]byte, error) {
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
req.Header.Set("User-Agent", userAgent)
http.DefaultClient.Timeout = time.Duration(timeOutMs * uint64(time.Millisecond))
response, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
defer response.Body.Close()
responseBody, err := io.ReadAll(response.Body)
if err != nil {
return nil, err
}
return responseBody, nil
}

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src/web/result.go
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/*
websurf - surf the web for data recursively
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package web
import "unbewohnte/websurf/config"
type Result struct {
PageURL string
Search config.Search
Data []string
}

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src/web/text.go
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/*
websurf - surf the web for data recursively
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package web
import (
"bufio"
"bytes"
"regexp"
"strings"
"golang.org/x/net/html"
)
func FindPageLinks(pageBody []byte) []string {
var urls []string
tokenizer := html.NewTokenizer(bytes.NewReader(pageBody))
for {
tokenType := tokenizer.Next()
switch tokenType {
case html.ErrorToken:
return urls
case html.StartTagToken:
token := tokenizer.Token()
if token.Data != "a" {
continue
}
// recheck
for _, attribute := range token.Attr {
if attribute.Key != "href" {
continue
}
if strings.HasPrefix(attribute.Val, "http") {
urls = append(urls, attribute.Val)
}
}
}
}
}
// Tries to find a certain string in page. Returns true if such string has been found
func IsTextOnPage(text string, ignoreCase bool, pageBody []byte) bool {
scanner := bufio.NewScanner(bytes.NewReader(pageBody))
for scanner.Scan() {
lineBytes := scanner.Bytes()
if !ignoreCase {
if bytes.Contains(lineBytes, []byte(text)) {
return true
}
} else {
if strings.Contains(strings.ToLower(string(lineBytes)), strings.ToLower(text)) {
return true
}
}
}
return false
}
// Tries to find a string matching given regexp in page. Returns an array of found
func FindPageRegexp(re *regexp.Regexp, pageBody []byte) []string {
return re.FindAllString(string(pageBody), -1)
}

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src/worker/pool.go
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/*
websurf - surf the web for data recursively
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package worker
import (
"sync"
"time"
"unbewohnte/websurf/web"
)
type visited struct {
URLs []string
Lock sync.Mutex
}
type Statistics struct {
PagesVisited uint64
MatchesFound uint64
StartTime time.Time
}
type Pool struct {
workersCount uint
workers []*Worker
visited visited
Stats Statistics
}
func NewWorkerPool(jobs chan web.Job, results chan web.Result, workerCount uint, workerConf WorkerConf) *Pool {
var newPool Pool = Pool{
workersCount: workerCount,
workers: nil,
visited: visited{
URLs: nil,
Lock: sync.Mutex{},
},
Stats: Statistics{
StartTime: time.Time{},
PagesVisited: 0,
MatchesFound: 0,
},
}
var i uint
for i = 0; i < workerCount; i++ {
newWorker := NewWorker(jobs, results, workerConf, &newPool.visited, &newPool.Stats)
newPool.workers = append(newPool.workers, &newWorker)
}
return &newPool
}
func (p *Pool) Work() {
p.Stats.StartTime = time.Now()
for _, worker := range p.workers {
worker.Stopped = false
go worker.Work()
}
}
func (p *Pool) Stop() {
for _, worker := range p.workers {
worker.Stopped = true
}
}

236
src/worker/worker.go
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/*
websurf - surf the web for data recursively
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package worker
import (
"fmt"
"io"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
"regexp"
"time"
"unbewohnte/websurf/config"
"unbewohnte/websurf/logger"
"unbewohnte/websurf/web"
)
type WorkerConf struct {
Requests config.Requests
Save config.Save
}
type Worker struct {
Jobs chan web.Job
Results chan web.Result
Conf WorkerConf
visited *visited
stats *Statistics
Stopped bool
}
func NewWorker(jobs chan web.Job, results chan web.Result, conf WorkerConf, visited *visited, stats *Statistics) Worker {
return Worker{
Jobs: jobs,
Results: results,
Conf: conf,
visited: visited,
stats: stats,
Stopped: false,
}
}
func (w *Worker) Work() {
if w.Stopped {
return
}
for job := range w.Jobs {
// check if the worker has been stopped
if w.Stopped {
// stop working
return
}
// check if it is the first occurence
w.visited.Lock.Lock()
var skip bool = false
for _, visitedURL := range w.visited.URLs {
if job.URL == visitedURL {
// okay, don't even bother. Move onto the next job
skip = true
logger.Info("Skipping %s", job.URL)
w.visited.Lock.Unlock()
break
}
}
if skip {
continue
}
// add this url to the visited list
w.visited.URLs = append(w.visited.URLs, job.URL)
w.visited.Lock.Unlock()
w.stats.PagesVisited++
// get page
logger.Info("Visiting %s", job.URL)
pageData, err := web.GetPage(job.URL, w.Conf.Requests.UserAgent, w.Conf.Requests.WaitTimeoutMs)
if err != nil {
logger.Error("Failed to get \"%s\": %s", job.URL, err)
continue
}
// find links
pageLinks := web.FindPageLinks(pageData)
go func() {
if job.Depth > 1 {
// decrement depth and add new jobs to the channel
job.Depth--
for _, link := range pageLinks {
if link != job.URL {
w.Jobs <- web.Job{
URL: link,
Search: job.Search,
Depth: job.Depth,
}
}
}
}
}()
// process and output result
var savePage bool = false
switch job.Search.Query {
case config.QueryLinks:
// simply output links
if len(pageLinks) > 0 {
w.Results <- web.Result{
PageURL: job.URL,
Search: job.Search,
Data: pageLinks,
}
savePage = true
}
case config.QueryImages:
// find image URLs, output data to the file
parsedURL, err := url.Parse(job.URL)
if err != nil {
logger.Error("Failed to parse URL \"%s\" to get hostname: %s", job.URL, err)
continue
}
imageLinks := web.FindPageImages(pageData, parsedURL.Host)
for count, imageLink := range imageLinks {
var imageName string = fmt.Sprintf("%s_%d_%s", parsedURL.Host, count, path.Base(imageLink))
response, err := http.Get(imageLink)
if err != nil {
logger.Error("Failed to get %s", imageLink)
continue
}
imageFile, err := os.Create(filepath.Join(w.Conf.Save.OutputDir, imageName))
if err != nil {
logger.Error("Failed to create image file \"%s\": %s", imageName, err)
continue
}
_, _ = io.Copy(imageFile, response.Body)
response.Body.Close()
imageFile.Close()
logger.Info("Outputted \"%s\"", imageName)
w.stats.MatchesFound++
}
if len(imageLinks) > 0 {
savePage = true
}
default:
// text search
switch job.Search.IsRegexp {
case true:
// find by regexp
re, err := regexp.Compile(job.Search.Query)
if err != nil {
logger.Error("Failed to compile regexp %s: %s", job.Search.Query, err)
continue
}
matches := web.FindPageRegexp(re, pageData)
if len(matches) > 0 {
w.Results <- web.Result{
PageURL: job.URL,
Search: job.Search,
Data: matches,
}
logger.Info("Found matches: %+v", matches)
w.stats.MatchesFound += uint64(len(matches))
savePage = true
}
case false:
// just text
if web.IsTextOnPage(job.Search.Query, true, pageData) {
w.Results <- web.Result{
PageURL: job.URL,
Search: job.Search,
Data: nil,
}
logger.Info("Found \"%s\" on page", job.Search.Query)
w.stats.MatchesFound++
savePage = true
}
}
// save page
if savePage && w.Conf.Save.SavePages && w.Conf.Save.OutputDir != "" {
url, err := url.Parse(job.URL)
if err != nil {
logger.Error("Failed to parse \"%s\" to save page: %s", job.URL, err)
break
}
var pageName string = fmt.Sprintf("%s_%s.html", url.Host, path.Base(job.URL))
pageFile, err := os.Create(filepath.Join(w.Conf.Save.OutputDir, pageName))
if err != nil {
logger.Error("Failed to create page of \"%s\": %s", job.URL, err)
} else {
pageFile.Write(pageData)
}
pageFile.Close()
}
// sleep before the next request
time.Sleep(time.Duration(w.Conf.Requests.RequestPauseMs * uint64(time.Millisecond)))
}
}
}
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