katanavsgocrawl

MIT 18 6 16,499

Nov 07 2022 v1.5.0(2026-03-10 14:52:47 ago)

2,053 2 6 BSD-3-Clause

Nov 20 2016 58.1 thousand (month) (2021-05-19 15:14:49 ago)

Katana is a next-generation web crawling and spidering framework written in Go by ProjectDiscovery. It is designed for fast, comprehensive endpoint and asset discovery and is widely used in the security research and bug bounty communities.

Katana offers multiple crawling modes:

Standard mode Fast HTTP-based crawling without a browser. Parses HTML, JavaScript files, and other resources to discover endpoints and links.
Headless mode Uses a headless Chrome browser for crawling JavaScript-rendered pages and single-page applications (SPAs).
Passive mode Discovers URLs from external sources (Wayback Machine, CommonCrawl, etc.) without actively visiting the target.

Key features include:

Scope control Configurable crawl scope with regex patterns for including/excluding URLs, domains, and file extensions.
JavaScript parsing Extracts endpoints from JavaScript files, inline scripts, and AJAX requests even in standard (non-headless) mode.
Customizable output Filter and format output with field selection, JSON output, and custom templates.
Rate limiting Built-in rate limiting and concurrency control to avoid overwhelming targets.
Proxy support HTTP and SOCKS5 proxy support with rotation.
Form filling Can detect and auto-fill forms to discover endpoints behind form submissions.

While Katana was designed for security research and reconnaissance, its fast crawling capabilities and JavaScript parsing make it equally useful for web scraping discovery and sitemap generation.

Gocrawl is a polite, slim and concurrent web crawler library written in Go. It is designed to be simple and easy to use, while still providing a high degree of flexibility and control over the crawling process.

One of the key features of Gocrawl is its politeness, which means that it obeys the website's robots.txt file and respects the crawl-delay specified in the file. It also takes into account the website's last modified date, if any, to avoid recrawling the same page. This helps to reduce the load on the website and prevent any potential legal issues. Gocrawl is also highly concurrent, which allows it to efficiently crawl large numbers of pages in parallel. This helps to speed up the crawling process and reduce the time required to complete the task.

The library also offers a high degree of flexibility in customizing the crawling process. It allows you to specify custom callbacks and handlers for handling different types of pages, such as error pages, redirects, and so on. This allows you to handle and process the pages as per your requirement. Additionally, Gocrawl provides various functionalities such as support for cookies, user-agent, auto-detection of links, and auto-detection of sitemaps.

Highlights

fastpopularlarge-scale

Example Use

```go package main import ( "context" "math" "github.com/projectdiscovery/katana/pkg/engine/standard" "github.com/projectdiscovery/katana/pkg/output" "github.com/projectdiscovery/katana/pkg/types" ) func main() { // Configure crawl options options := &types.Options{ MaxDepth: 3, FieldScope: "rdn", // restrict to root domain BodyReadSize: math.MaxInt, Timeout: 10, Concurrency: 10, Parallelism: 10, Delay: 0, RateLimit: 150, Strategy: "depth-first", OnResult: func(result output.Result) { // Process each discovered URL println(result.Request.URL) }, } // Create and run the crawler crawlerOptions, _ := types.NewCrawlerOptions(options) defer crawlerOptions.Close() crawler, _ := standard.New(crawlerOptions) defer crawler.Close() // Start crawling _ = crawler.Crawl("https://example.com") } ```

```go // Only enqueue the root and paths beginning with an "a" var rxOk = regexp.MustCompile(`http://duckduckgo\.com(/a.*)?$`) // Create the Extender implementation, based on the gocrawl-provided DefaultExtender, // because we don't want/need to override all methods. type ExampleExtender struct { gocrawl.DefaultExtender // Will use the default implementation of all but Visit and Filter } // Override Visit for our need. func (x *ExampleExtender) Visit(ctx *gocrawl.URLContext, res *http.Response, doc *goquery.Document) (interface{}, bool) { // Use the goquery document or res.Body to manipulate the data // ... // Return nil and true - let gocrawl find the links return nil, true } // Override Filter for our need. func (x *ExampleExtender) Filter(ctx *gocrawl.URLContext, isVisited bool) bool { return !isVisited && rxOk.MatchString(ctx.NormalizedURL().String()) } func ExampleCrawl() { // Set custom options opts := gocrawl.NewOptions(new(ExampleExtender)) // should always set your robot name so that it looks for the most // specific rules possible in robots.txt. opts.RobotUserAgent = "Example" // and reflect that in the user-agent string used to make requests, // ideally with a link so site owners can contact you if there's an issue opts.UserAgent = "Mozilla/5.0 (compatible; Example/1.0; +http://example.com)" opts.CrawlDelay = 1 * time.Second opts.LogFlags = gocrawl.LogAll // Play nice with ddgo when running the test! opts.MaxVisits = 2 // Create crawler and start at root of duckduckgo c := gocrawl.NewCrawlerWithOptions(opts) c.Run("https://duckduckgo.com/") // Remove "x" before Output: to activate the example (will run on go test) // xOutput: voluntarily fail to see log output } ```

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