Generate random user agent when non is provided (#76)

16 files changed, 1742 insertions, 79 deletions

diff --git a/.gitignore b/.gitignore
index fd10abd..e3fb93e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .DS_Store
 node_modules
 dist/
+examples/**/*.cache
diff --git a/examples/useragents/chrome.js b/examples/useragents/chrome.js
new file mode 100644
index 0000000..c3a6fcd
--- /dev/null
+++ b/examples/useragents/chrome.js
@@ -0,0 +1,50 @@
+import { parse } from "flyscrape";
+
+export const config = {
+  url: "https://chromereleases.googleblog.com/search/label/Stable%20updates",
+  follow: [".blog-pager-older-link"],
+  depth: 30,
+  cache: "file",
+};
+
+export default function ({ doc, absoluteURL }) {
+  const posts = doc.find(".post");
+  return posts.map(post => {
+    const title = post.find("h2").text().trim();
+    const body = parse(post.find(".post-content").text()).find("p:nth-child(1)").text().trim();
+
+    const regexes = [
+       /(\d+\.\d+\.\d+\.\d+(\/\.\d+)?)\)? for (Mac)/,
+       /(\d+\.\d+\.\d+\.\d+(\/\.\d+)?)\)? for (Windows)/,
+       /(\d+\.\d+\.\d+\.\d+(\/\.\d+)?)\)? for (Linux)/,
+       /(\d+\.\d+\.\d+\.\d+(\/\.\d+)?)\)? for (iOS)/,
+       /(\d+\.\d+\.\d+\.\d+(\/\.\d+)?)\)? for (Android)/,
+       /(\d+\.\d+\.\d+\.\d+(\/\.\d+)?)\)? for (ChromeOS)/,
+       /(\d+\.\d+\.\d+\.\d+(\/\.\d+)?)\)? for (Mac,Linux)/,
+       /(\d+\.\d+\.\d+\.\d+(\/\.\d+)?)\)? for (Mac and Linux)/,
+       /(\d+\.\d+\.\d+\.\d+(\/\.\d+)?)\)?\s\(Platform version:\s[\d\.]+\)\sfor\smost\s(ChromeOS)/,
+    ];
+
+    const versions = new Set();
+    for (const regex of regexes) {
+      const matches = body.match(regex);
+      if (!matches) {
+        continue;
+      }
+
+      let versionStr = matches[1];
+
+      let vv = versionStr.split("/");
+      if (vv.length == 2) {
+        vv[1] = vv[0].substring(0, vv[0].lastIndexOf(".")) + vv[1];
+      }
+
+      for (const version of vv) {
+        versions.add(version)
+      }
+    }
+
+
+    return versions
+  }).filter(Boolean).flat();
+}
diff --git a/examples/useragents/edge.js b/examples/useragents/edge.js
new file mode 100644
index 0000000..1e76131
--- /dev/null
+++ b/examples/useragents/edge.js
@@ -0,0 +1,12 @@
+import { parse } from "flyscrape";
+
+export const config = {
+  url: "https://learn.microsoft.com/en-us/deployedge/microsoft-edge-release-schedule",
+};
+
+export default function ({ doc, absoluteURL }) {
+  const links = doc.find("table a");
+  return links
+    .map(link => link.text())
+    .filter(Boolean)
+}
diff --git a/examples/useragents/firefox.js b/examples/useragents/firefox.js
new file mode 100644
index 0000000..20d4d3c
--- /dev/null
+++ b/examples/useragents/firefox.js
@@ -0,0 +1,13 @@
+import { parse } from "flyscrape";
+
+export const config = {
+  url: "https://www.mozilla.org/en-US/firefox/releases/",
+};
+
+export default function ({ doc, absoluteURL }) {
+  const links = doc.find(".c-release-list a");
+  return links
+    .map(link => link.text())
+    .filter(Boolean)
+    .filter(version => parseFloat(version) >= 60);
+}
diff --git a/examples/useragents/opera.js b/examples/useragents/opera.js
new file mode 100644
index 0000000..56e192c
--- /dev/null
+++ b/examples/useragents/opera.js
@@ -0,0 +1,15 @@
+
+export const config = {
+  urls: range("https://blogs.opera.com/desktop/changelog-for-{}/", 60, 110),
+};
+
+export default function ({ doc, absoluteURL }) {
+  const versions = doc.find(".content h4");
+  return versions.map(versions => {
+    return versions.text().split(" ")[0].trim();
+  }).filter(Boolean);
+}
+
+function range(url, from, to) {
+  return Array.from({length: to - from + 1}).map((_, i) => url.replace("{}", i + from));
+}
diff --git a/modules/headers/headers.go b/modules/headers/headers.go
index 877b370..5ed58f9 100644
--- a/modules/headers/headers.go
+++ b/modules/headers/headers.go
@@ -26,15 +26,15 @@ func (Module) ModuleInfo() flyscrape.ModuleInfo {
 }
 
 func (m Module) AdaptTransport(t http.RoundTripper) http.RoundTripper {
-	if len(m.Headers) == 0 {
-		return t
-	}
-
 	return flyscrape.RoundTripFunc(func(r *http.Request) (*http.Response, error) {
 		for k, v := range m.Headers {
 			r.Header.Set(k, v)
 		}
 
+		if r.Header.Get("User-Agent") == "" {
+			r.Header.Set("User-Agent", randomUserAgent())
+		}
+
 		return t.RoundTrip(r)
 	})
 }
diff --git a/modules/headers/headers_test.go b/modules/headers/headers_test.go
index 72b9001..afd8a72 100644
--- a/modules/headers/headers_test.go
+++ b/modules/headers/headers_test.go
@@ -5,9 +5,8 @@
 package headers_test
 
 import (
-	"fmt"
 	"net/http"
-	"reflect"
+	"strings"
 	"testing"
 
 	"github.com/philippta/flyscrape"
@@ -18,77 +17,55 @@ import (
 )
 
 func TestHeaders(t *testing.T) {
-	testCases := []struct {
-		name        string
-		headersFn   func() headers.Module
-		wantHeaders map[string][]string
-	}{
-		{
-			name: "empty custom headers",
-			headersFn: func() headers.Module {
-				return headers.Module{
-					Headers: map[string]string{},
-				}
-			},
-			wantHeaders: map[string][]string{"User-Agent": {"flyscrape/0.1"}},
-		},
-		{
-			name: "no duplicate headers between default and custom",
-			headersFn: func() headers.Module {
-				return headers.Module{
-					Headers: map[string]string{
-						"Authorization": "Basic ZGVtbzpwQDU1dzByZA==",
-					},
-				}
-			},
-			wantHeaders: map[string][]string{
-				"Authorization": {"Basic ZGVtbzpwQDU1dzByZA=="},
-				"User-Agent":    {"flyscrape/0.1"},
+	gotHeaders := map[string]string{}
+	sentHeaders := map[string]string{
+		"Authorization": "Basic ZGVtbzpwQDU1dzByZA==",
+		"User-Agent":    "Gecko/1.0",
+	}
+
+	mods := []flyscrape.Module{
+		hook.Module{
+			AdaptTransportFn: func(rt http.RoundTripper) http.RoundTripper {
+				return flyscrape.RoundTripFunc(func(r *http.Request) (*http.Response, error) {
+					for k := range r.Header {
+						gotHeaders[k] = r.Header.Get(k)
+					}
+					return flyscrape.MockResponse(200, "")
+				})
 			},
 		},
-		{
-			name: "duplicate headers between default and custom",
-			headersFn: func() headers.Module {
-				return headers.Module{
-					Headers: map[string]string{
-						"Authorization": "Basic ZGVtbzpwQDU1dzByZA==",
-						"User-Agent":    "Gecko/1.0",
-					},
-				}
-			},
-			wantHeaders: map[string][]string{
-				"Authorization": {"Basic ZGVtbzpwQDU1dzByZA=="},
-				"User-Agent":    {"Gecko/1.0"},
-			},
+		&starturl.Module{URL: "http://www.example.com"},
+		&headers.Module{
+			Headers: sentHeaders,
 		},
 	}
 
-	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
-			var headers map[string][]string
+	scraper := flyscrape.NewScraper()
+	scraper.Modules = mods
+	scraper.Run()
 
-			mods := []flyscrape.Module{
-				&starturl.Module{URL: "http://www.example.com"},
-				hook.Module{
-					AdaptTransportFn: func(rt http.RoundTripper) http.RoundTripper {
-						return flyscrape.RoundTripFunc(func(r *http.Request) (*http.Response, error) {
-							headers = r.Header
-							return rt.RoundTrip(r)
-						})
-					},
-				},
-				tc.headersFn(),
-			}
-
-			scraper := flyscrape.NewScraper()
-			scraper.Modules = mods
-			scraper.Run()
+	require.Equal(t, sentHeaders, gotHeaders)
+}
 
-			require.Truef(
-				t,
-				reflect.DeepEqual(tc.wantHeaders, headers),
-				fmt.Sprintf("expected: %v; actual: %v", tc.wantHeaders, headers),
-			)
-		})
+func TestHeadersRandomUserAgent(t *testing.T) {
+	var userAgent string
+	mods := []flyscrape.Module{
+		hook.Module{
+			AdaptTransportFn: func(rt http.RoundTripper) http.RoundTripper {
+				return flyscrape.RoundTripFunc(func(r *http.Request) (*http.Response, error) {
+					userAgent = r.Header.Get("User-Agent")
+					return flyscrape.MockResponse(200, "")
+				})
+			},
+		},
+		&starturl.Module{URL: "http://www.example.com"},
+		&headers.Module{},
 	}
+
+	scraper := flyscrape.NewScraper()
+	scraper.Modules = mods
+	scraper.Run()
+
+	require.NotEmpty(t, userAgent)
+	require.True(t, strings.HasPrefix(userAgent, "Mozilla/5.0 ("))
 }
diff --git a/modules/headers/versions.go b/modules/headers/versions.go
new file mode 100644
index 0000000..eae19f6
--- /dev/null
+++ b/modules/headers/versions.go
@@ -0,0 +1,96 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package headers
+
+import (
+	_ "embed"
+	"fmt"
+	"math/rand"
+	"strings"
+)
+
+//go:generate bash -c "flyscrape run ../../examples/useragents/chrome.js | jq -r '[.[].data] | flatten | .[]' | sort -nr | uniq > versions_chrome.txt"
+//go:generate bash -c "flyscrape run ../../examples/useragents/firefox.js | jq -r '[.[].data] | flatten | .[]' | sort -nr | uniq > versions_firefox.txt"
+//go:generate bash -c "flyscrape run ../../examples/useragents/edge.js | jq -r '[.[].data] | flatten | .[]' | sort -nr | uniq > versions_edge.txt"
+//go:generate bash -c "flyscrape run ../../examples/useragents/opera.js | jq -r '[.[].data] | flatten | .[]' | sort -nr | uniq > versions_opera.txt"
+
+//go:embed versions_chrome.txt
+var versionsChromeRaw string
+var versionsChrome = strings.Split("\n", strings.TrimSpace(versionsChromeRaw))
+
+//go:embed versions_firefox.txt
+var versionsFirefoxRaw string
+var versionsFirefox = strings.Split("\n", strings.TrimSpace(versionsFirefoxRaw))
+
+//go:embed versions_edge.txt
+var versionsEdgeRaw string
+var versionsEdge = strings.Split("\n", strings.TrimSpace(versionsEdgeRaw))
+
+//go:embed versions_opera.txt
+var versionsOperaRaw string
+var versionsOpera = strings.Split("\n", strings.TrimSpace(versionsOperaRaw))
+
+//go:embed versions_macos.txt
+var versionsMacOSRaw string
+var versionsMacOS = strings.Split("\n", strings.TrimSpace(versionsMacOSRaw))
+
+//go:embed versions_windows.txt
+var versionsWindowsRaw string
+var versionsWindows = strings.Split("\n", strings.TrimSpace(versionsWindowsRaw))
+
+//go:embed versions_linux.txt
+var versionsLinuxRaw string
+var versionsLinux = strings.Split("\n", strings.TrimSpace(versionsLinuxRaw))
+
+func randomUAChrome() string {
+	f := "Mozilla/5.0 (%s) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/%s Safari/537.36"
+	return fmt.Sprintf(f, randomOS(), random(versionsChrome))
+}
+
+func randomUAFirefox() string {
+	f := "Mozilla/5.0 (%s; rv:%s) Gecko/20100101 Firefox/%s"
+	ver := random(versionsFirefox)
+	return fmt.Sprintf(f, randomOS(), ver, ver)
+}
+
+func randomUAEdge() string {
+	f := "Mozilla/5.0 (%s) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 Edg/%s"
+	return fmt.Sprintf(f, randomOS(), random(versionsEdge))
+}
+
+func randomUAOpera() string {
+	f := "Mozilla/5.0 (%s) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 OPR/"
+	return fmt.Sprintf(f, randomOS(), random(versionsOpera))
+}
+
+func randomUserAgent() string {
+	switch rand.Intn(4) {
+	case 0:
+		return randomUAChrome()
+	case 1:
+		return randomUAFirefox()
+	case 2:
+		return randomUAEdge()
+	case 3:
+		return randomUAOpera()
+	}
+	panic("rand.Intn is broken")
+}
+
+func randomOS() string {
+	switch rand.Intn(3) {
+	case 0:
+		return random(versionsMacOS)
+	case 1:
+		return random(versionsWindows)
+	case 2:
+		return random(versionsLinux)
+	}
+	panic("rand.Intn is broken")
+}
+
+func random(ss []string) string {
+	return ss[rand.Intn(len(ss))]
+}
diff --git a/modules/headers/versions_chrome.txt b/modules/headers/versions_chrome.txt
new file mode 100644
index 0000000..b15a432
--- /dev/null
+++ b/modules/headers/versions_chrome.txt
@@ -0,0 +1,342 @@
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diff --git a/modules/headers/versions_edge.txt b/modules/headers/versions_edge.txt
new file mode 100644
index 0000000..1eda77a
--- /dev/null
+++ b/modules/headers/versions_edge.txt
@@ -0,0 +1,89 @@
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diff --git a/modules/headers/versions_firefox.txt b/modules/headers/versions_firefox.txt
new file mode 100644
index 0000000..ceccad8
--- /dev/null
+++ b/modules/headers/versions_firefox.txt
@@ -0,0 +1,309 @@
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diff --git a/modules/headers/versions_linux.txt b/modules/headers/versions_linux.txt
new file mode 100644
index 0000000..eb836ee
--- /dev/null
+++ b/modules/headers/versions_linux.txt
@@ -0,0 +1,2 @@
+X11; Linux x86_64
+X11; Ubuntu; Linux x86_64
diff --git a/modules/headers/versions_macos.txt b/modules/headers/versions_macos.txt
new file mode 100644
index 0000000..2439a62
--- /dev/null
+++ b/modules/headers/versions_macos.txt
@@ -0,0 +1,87 @@
+Macintosh; Intel Mac OS X 11_2_1
+Macintosh; Intel Mac OS X 11_2_2
+Macintosh; Intel Mac OS X 11_2_3
+Macintosh; Intel Mac OS X 11_3_1
+Macintosh; Intel Mac OS X 11_3_5
+Macintosh; Intel Mac OS X 11_4_3
+Macintosh; Intel Mac OS X 11_5_1
+Macintosh; Intel Mac OS X 11_5_2
+Macintosh; Intel Mac OS X 11_6_1
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+Macintosh; Intel Mac OS X 11_6_3
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+Macintosh; Intel Mac OS X 13_4_1
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+Macintosh; Intel Mac OS X 13_7_1
+Macintosh; Intel Mac OS X 14_0_6
+Macintosh; Intel Mac OS X 14_1_1
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+Macintosh; Intel Mac OS X 14_3_1
+Macintosh; Intel Mac OS X 14_4_1
+Macintosh; Intel Mac OS X 14_4_3
+Macintosh; Intel Mac OS X 14_5_2
+Macintosh; Intel Mac OS X 14_6_1
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+Macintosh; Intel Mac OS X 15_0
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diff --git a/modules/headers/versions_opera.txt b/modules/headers/versions_opera.txt
new file mode 100644
index 0000000..8f7dd3f
--- /dev/null
+++ b/modules/headers/versions_opera.txt
@@ -0,0 +1,675 @@
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diff --git a/modules/headers/versions_windows.txt b/modules/headers/versions_windows.txt
new file mode 100644
index 0000000..9fbc0aa
--- /dev/null
+++ b/modules/headers/versions_windows.txt
@@ -0,0 +1,2 @@
+Windows NT 10.0; Win64; x64
+Windows NT 10.0; WOW64
diff --git a/scrape.go b/scrape.go
index 5b0f4e0..1667f42 100644
--- a/scrape.go
+++ b/scrape.go
@@ -134,7 +134,7 @@ func (s *Scraper) process(url string, depth int) {
 	request := &Request{
 		Method:  http.MethodGet,
 		URL:     url,
-		Headers: defaultHeaders(),
+		Headers: http.Header{},
 		Cookies: s.Client.Jar,
 		Depth:   depth,
 	}
@@ -231,10 +231,3 @@ func (s *Scraper) enqueueJob(url string, depth int) {
 		s.wg.Done()
 	}
 }
-
-func defaultHeaders() http.Header {
-	h := http.Header{}
-	h.Set("User-Agent", "flyscrape/0.1")
-
-	return h
-}