Respect robots.txt

src/drivers/webextension/js/driver.js

@@ -1,6 +1,7 @@
 /**
  * WebExtension driver
  */
+              setOption('robotsTxtCache', {});
 
 var tabCache = {};
 var headersCache = {};
@@ -61,7 +62,7 @@ function post(url, body) {
     body
   })
     .then(response => {
-      wappalyzer.log('POST ' + url + ': ', 'driver');
+      wappalyzer.log('POST ' + url + ': ' + response.status, 'driver');
     })
     .catch(error => {
       wappalyzer.log('POST ' + url + ': ' + error, 'driver', 'error');
@@ -130,9 +131,9 @@ browser.webRequest.onCompleted.addListener(request => {
   var responseHeaders = {};
 
   if ( request.responseHeaders ) {
-    var uri = request.url.replace(/#.*$/, ''); // Remove hash
+    var url = wappalyzer.parseUrl(request.url);
 
-    request.responseHeaders.forEach(header => {
+    request.responseHeaders.forEach(function(header) {
       responseHeaders[header.name.toLowerCase()] = header.value || '' + header.binaryValue;
     });
 
@@ -141,12 +142,12 @@ browser.webRequest.onCompleted.addListener(request => {
     }
 
     if ( /text\/html/.test(responseHeaders['content-type']) ) {
-      if ( headersCache[uri] === undefined ) {
-        headersCache[uri] = {};
+      if ( headersCache[url.canonical] === undefined ) {
+        headersCache[url.canonical] = {};
       }
 
       Object.keys(responseHeaders).forEach(header => {
-        headersCache[uri][header] = responseHeaders[header];
+        headersCache[url.canonical][header] = responseHeaders[header];
       });
     }
   }
@@ -167,15 +168,15 @@ browser.webRequest.onCompleted.addListener(request => {
 
         break;
       case 'analyze':
-        var a = document.createElement('a');
+        var url = wappalyzer.parseUrl(sender.tab.url);
 
-        a.href = sender.tab.url.replace(/#.*$/, '');
-
-        if ( headersCache[a.href] !== undefined ) {
-          message.subject.headers = headersCache[a.href];
+        if ( headersCache[url.canonical] !== undefined ) {
+          message.subject.headers = headersCache[url.canonical];
         }
 
-        wappalyzer.analyze(a.hostname, a.href, message.subject, { tab: sender.tab });
+        wappalyzer.analyze(url.hostname, url.canonical, message.subject, {
+          tab: sender.tab
+        });
 
         break;
       case 'ad_log':
@@ -202,7 +203,7 @@ browser.webRequest.onCompleted.addListener(request => {
  */
 wappalyzer.driver.log = (message, source, type) => {
   console.log('[wappalyzer ' + type + ']', '[' + source + ']', message);
-}
+};
 
 /**
  * Display apps
@@ -255,7 +256,44 @@ wappalyzer.driver.displayApps = (detected, context) => {
         }
       });
   }
-}
+};
+
+/**
+ * Fetch and cache robots.txt for host
+ */
+wappalyzer.driver.getRobotsTxt = (host, secure = false) => {
+  return new Promise((resolve, reject) => {
+    getOption('robotsTxtCache')
+      .then(robotsTxtCache => {
+        robotsTxtCache = robotsTxtCache || {};
+
+        if ( host in robotsTxtCache ) {
+          resolve(robotsTxtCache[host]);
+        } else {
+          var url = 'http' + ( secure ? 's' : '' ) + '://' + host + '/robots.txt';
+
+          fetch('http' + ( secure ? 's' : '' ) + '://' + host + '/robots.txt')
+            .then(response => {
+              if ( !response.ok ) {
+                throw 'GET ' + response.url + ' was not ok';
+              }
+
+              return response.text();
+            })
+            .then(robotsTxt => {
+              robotsTxtCache[host] = wappalyzer.parseRobotsTxt(robotsTxt);
+
+              setOption('robotsTxtCache', robotsTxtCache);
+
+              resolve(robotsTxtCache[host]);
+
+              var hostname = host.replace(/:[0-9]+$/, '')
+            })
+            .catch(reject);
+        }
+      });
+  });
+};
 
 /**
  * Anonymously track detected applications for research purposes
@@ -268,4 +306,4 @@ wappalyzer.driver.ping = (ping, adCache) => {
         post('https://ad.wappalyzer.com/log/wp/', adCache);
       }
     });
-}
+};

src/wappalyzer.js

@@ -37,8 +37,6 @@ wappalyzer.log = (message, source, type) => {
 };
 
 wappalyzer.analyze = (hostname, url, data, context) => {
-  wappalyzer.log('Function call: analyze()', 'core');
-
   var apps = {};
 
   // Remove hash from URL
@@ -74,6 +72,10 @@ wappalyzer.analyze = (hostname, url, data, context) => {
     if ( data.env ) {
       analyzeEnv(app, data.env);
     }
+
+    if ( data.robotsTxt ) {
+      analyzeRobotsTxt(app, data.robotsTxt);
+    }
   })
 
   Object.keys(apps).forEach(appName => {
@@ -104,6 +106,65 @@ wappalyzer.cacheDetectedAds = ad => {
   adCache.push(ad);
 }
 
+/**
+ *
+ */
+wappalyzer.robotsTxtAllows = url => {
+  return new Promise((resolve, reject) => {
+    var parsed = wappalyzer.parseUrl(url);
+
+    wappalyzer.driver.getRobotsTxt(parsed.host, parsed.protocol === 'https:')
+      .then(robotsTxt => {
+        robotsTxt.forEach(disallow => {
+          if ( parsed.pathname.search(disallow) === 0 ) {
+            reject();
+          }
+        });
+
+        resolve();
+      });
+  });
+};
+
+/**
+ * Parse a URL
+ */
+wappalyzer.parseUrl = url => {
+  var a = document.createElement('a');
+
+  a.href = url;
+
+  a.canonical = a.protocol + '//' + a.host + a.pathname;
+
+  return a;
+}
+
+/**
+ *
+ */
+wappalyzer.parseRobotsTxt = robotsTxt => {
+  var userAgent;
+  var disallow = [];
+
+  robotsTxt.split('\n').forEach(line => {
+    var matches = /^User-agent:\s*(.+)$/i.exec(line);
+
+    if ( matches ) {
+      userAgent = matches[1].toLowerCase();
+    } else {
+      if ( userAgent === '*' || userAgent === 'wappalyzer' ) {
+        matches = /^Disallow:\s*(.+)$/i.exec(line);
+
+        if ( matches ) {
+          disallow.push(matches[1]);
+        }
+      }
+    }
+  });
+
+  return disallow;
+}
+
 /**
  * Enclose string in array
  */
@@ -156,7 +217,7 @@ function parsePatterns(patterns) {
   }
 
   // Convert back to array if the original pattern list was an array (or string)
-  if ( parsed.hasOwnProperty('main') ) {
+  if ( 'main' in parsed ) {
     parsed = parsed.main;
   }
 
@@ -206,7 +267,7 @@ function resolveImplies(apps, url) {
             return;
           }
 
-          if ( !apps.hasOwnProperty(implied.string) ) {
+          if ( !( implied.string in apps ) ) {
             apps[implied.string] = detected[url] && detected[url][implied.string] ? detected[url][implied.string] : new Application(implied.string, true);
 
             checkImplies = true;
@@ -226,8 +287,6 @@ function resolveImplies(apps, url) {
  * Cache detected applications
  */
 function cacheDetectedApps(apps, url) {
-  wappalyzer.log('Function call: cacheDetectedApps()', 'core');
-
   Object.keys(apps).forEach(appName => {
     var app = apps[appName];
 
@@ -244,35 +303,39 @@ function cacheDetectedApps(apps, url) {
  * Track detected applications
  */
 function trackDetectedApps(apps, url, hostname, html) {
-  wappalyzer.log('Function call: trackDetectedApps()', 'core');
-
   Object.keys(apps).forEach(appName => {
     var app = apps[appName];
 
-    if ( detected[url][appName].getConfidence() >= 100 && validation.hostname.test(hostname) && !validation.hostnameBlacklist.test(url) ) {
-      if ( !hostnameCache.hasOwnProperty(hostname) ) {
-        hostnameCache[hostname] = {
-          applications: {},
-          meta: {}
-        };
-      }
-
-      if ( !hostnameCache[hostname].applications.hasOwnProperty(appName) ) {
-        hostnameCache[hostname].applications[appName] = {
-          hits: 0
-        };
-      }
-
-      hostnameCache[hostname].applications[appName].hits ++;
-
-      if ( apps[appName].version ) {
-        hostnameCache[hostname].applications[appName].version = app.version;
+    if ( detected[url][appName].getConfidence() >= 100 ) {
+      if ( validation.hostname.test(hostname) && !validation.hostnameBlacklist.test(url) ) {
+        wappalyzer.robotsTxtAllows(url)
+          .then(() => {
+            if ( !( hostname in hostnameCache ) ) {
+              hostnameCache[hostname] = {
+                applications: {},
+                meta: {}
+              };
+            }
+
+            if ( !( appName in hostnameCache[hostname].applications ) ) {
+              hostnameCache[hostname].applications[appName] = {
+                hits: 0
+              };
+            }
+
+            hostnameCache[hostname].applications[appName].hits ++;
+
+            if ( apps[appName].version ) {
+              hostnameCache[hostname].applications[appName].version = app.version;
+            }
+          })
+        .catch(() => console.log('Disallowed in robots.txt: ' + url))
       }
     }
   });
 
   // Additional information
-  if ( hostnameCache.hasOwnProperty(hostname) ) {
+  if ( hostname in hostnameCache ) {
     var match = html.match(/<html[^>]*[: ]lang="([a-z]{2}((-|_)[A-Z]{2})?)"/i);
 
     if ( match && match.length ) {
@@ -373,7 +436,7 @@ function analyzeHeaders(app, headers) {
       patterns[header].forEach(pattern => {
         header = header.toLowerCase();
 
-        if ( headers.hasOwnProperty(header) && pattern.regex.test(headers[header]) ) {
+        if ( header in headers && pattern.regex.test(headers[header]) ) {
           addDetected(app, pattern, 'headers', headers[header], header);
         }
       });
@@ -398,6 +461,21 @@ function analyzeEnv(app, envs) {
   }
 }
 
+/**
+ * Analyze robots.txt
+ */
+function analyzeRobotsTxt(app, robotsTxt) {
+  var patterns = parsePatterns(app.props.robotsTxt);
+
+  if ( patterns.length ) {
+    patterns.forEach(pattern => {
+      if ( pattern.regex.test(robotsTxt) ) {
+        addDetected(app, pattern, 'robotsTxt', robotsTxt);
+      }
+    });
+  }
+}
+
 /**
  * Mark application as detected, set confidence and version
  */