1/** 2 * Observe how the user enters content into the comment form in order to determine whether it's a bot or not. 3 * 4 * Note that no actual input is being saved here, only counts and timings between events. 5 */ 6 7( function() { 8 // Passive event listeners are guaranteed to never call e.preventDefault(), 9 // but they're not supported in all browsers. Use this feature detection 10 // to determine whether they're available for use. 11 var supportsPassive = false; 12 13 try { 14 var opts = Object.defineProperty( {}, 'passive', { 15 get : function() { 16 supportsPassive = true; 17 } 18 } ); 19 20 window.addEventListener( 'testPassive', null, opts ); 21 window.removeEventListener( 'testPassive', null, opts ); 22 } catch ( e ) {} 23 24 function init() { 25 var input_begin = ''; 26 27 var keydowns = {}; 28 var lastKeyup = null; 29 var lastKeydown = null; 30 var keypresses = []; 31 32 var modifierKeys = []; 33 var correctionKeys = []; 34 35 var lastMouseup = null; 36 var lastMousedown = null; 37 var mouseclicks = []; 38 var mouseclickCoordinates = []; 39 40 var mousemoveTimer = null; 41 var lastMousemoveX = null; 42 var lastMousemoveY = null; 43 var lastMousemoveTime = null; 44 var mousemoveStart = null; 45 var mousemoves = []; 46 var intervalsBetweenMousemovesAndClicks = []; 47 48 var touchmoveCountTimer = null; 49 var touchmoveCount = 0; 50 51 var lastTouchEnd = null; 52 var lastTouchStart = null; 53 var touchEvents = []; 54 55 var scrollCountTimer = null; 56 var scrollCount = 0; 57 58 var correctionKeyCodes = [ 'Backspace', 'Delete', 'ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight', 'Home', 'End', 'PageUp', 'PageDown' ]; 59 var modifierKeyCodes = [ 'Shift', 'CapsLock' ]; 60 61 var forms = document.querySelectorAll( 'form[method=post]' ); 62 63 for ( var i = 0; i < forms.length; i++ ) { 64 var form = forms[i]; 65 66 var formAction = form.getAttribute( 'action' ); 67 68 // Ignore forms that POST directly to other domains; these could be things like payment forms. 69 if ( formAction ) { 70 // Check that the form is posting to an external URL, not a path. 71 if ( formAction.indexOf( 'http://' ) == 0 || formAction.indexOf( 'https://' ) == 0 ) { 72 if ( formAction.indexOf( 'http://' + window.location.hostname + '/' ) != 0 && formAction.indexOf( 'https://' + window.location.hostname + '/' ) != 0 ) { 73 continue; 74 } 75 } 76 } 77 78 form.addEventListener( 'submit', function () { 79 var ak_bkp = prepare_array_for_request( keypresses ); 80 var ak_bmc = prepare_array_for_request( mouseclicks ); 81 var ak_bte = prepare_array_for_request( touchEvents ); 82 var ak_bmm = prepare_array_for_request( mousemoves ); 83 var ak_bcc = prepare_array_for_request( mouseclickCoordinates ); 84 var ak_bibmac = intervalsBetweenMousemovesAndClicks.slice( 0, 100 ).join( ';' ); 85 86 var input_fields = { 87 // When did the user begin entering any input? 88 'bib': input_begin, 89 90 // When was the form submitted? 91 'bfs': Date.now(), 92 93 // How many keypresses did they make? 94 'bkpc': keypresses.length, 95 96 // How quickly did they press a sample of keys, and how long between them? 97 'bkp': ak_bkp, 98 99 // How quickly did they click the mouse, and how long between clicks? 100 'bmc': ak_bmc, 101 102 // How many mouseclicks did they make? 103 'bmcc': mouseclicks.length, 104 105 // When did they press modifier keys (like Shift or Capslock)? 106 'bmk': modifierKeys.join( ';' ), 107 108 // When did they correct themselves? e.g., press Backspace, or use the arrow keys to move the cursor back 109 'bck': correctionKeys.join( ';' ), 110 111 // How many times did they move the mouse? 112 'bmmc': mousemoves.length, 113 114 // How many times did they move around using a touchscreen? 115 'btmc': touchmoveCount, 116 117 // How many times did they scroll? 118 'bsc': scrollCount, 119 120 // How quickly did they perform touch events, and how long between them? 121 'bte': ak_bte, 122 123 // How many touch events were there? 124 'btec' : touchEvents.length, 125 126 // How quickly did they move the mouse, and how long between moves? 127 'bmm' : ak_bmm, 128 129 // Click coordinates 130 'bcc' : ak_bcc, 131 132 // Milliseconds between last mouse movement and each click 133 'bibmac' : ak_bibmac 134 }; 135 136 var akismet_field_prefix = 'ak_'; 137 138 if ( this.getElementsByClassName ) { 139 // Check to see if we've used an alternate field name prefix. We store this as an attribute of the container around some of the Akismet fields. 140 var possible_akismet_containers = this.getElementsByClassName( 'akismet-fields-container' ); 141 142 for ( var containerIndex = 0; containerIndex < possible_akismet_containers.length; containerIndex++ ) { 143 var container = possible_akismet_containers.item( containerIndex ); 144
145 if ( container.getAttribute( 'data-prefix' ) ) { 146 akismet_field_prefix = container.getAttribute( 'data-prefix' ); 147 break; 148 } 149 } 150 } 151 152 for ( var field_name in input_fields ) { 153 var field = document.createElement( 'input' ); 154 field.setAttribute( 'type', 'hidden' ); 155 field.setAttribute( 'name', akismet_field_prefix + field_name ); 156 field.setAttribute( 'value', input_fields[ field_name ] ); 157 this.appendChild( field ); 158 } 159 }, supportsPassive ? { passive: true } : false ); 160 161 form.addEventListener( 'keydown', function ( e ) { 162 // If you hold a key down, some browsers send multiple keydown events in a row. 163 // Ignore any keydown events for a key that hasn't come back up yet. 164 if ( e.key in keydowns ) { 165 return; 166 } 167 168 var keydownTime = ( new Date() ).getTime(); 169 keydowns[ e.key ] = [ keydownTime ]; 170 171 if ( ! input_begin ) { 172 input_begin = keydownTime; 173 } 174 175 // In some situations, we don't want to record an interval since the last keypress -- for example, 176 // on the first keypress, or on a keypress after focus has changed to another element. Normally, 177 // we want to record the time between the last keyup and this keydown. But if they press a 178 // key while already pressing a key, we want to record the time between the two keydowns. 179 180 var lastKeyEvent = Math.max( lastKeydown, lastKeyup ); 181 182 if ( lastKeyEvent ) { 183 keydowns[ e.key ].push( keydownTime - lastKeyEvent ); 184 } 185 186 lastKeydown = keydownTime; 187 }, supportsPassive ? { passive: true } : false ); 188 189 form.addEventListener( 'keyup', function ( e ) { 190 if ( ! ( e.key in keydowns ) ) { 191 // This key was pressed before this script was loaded, or a mouseclick happened during the keypress, or... 192 return; 193 } 194 195 var keyupTime = ( new Date() ).getTime(); 196 197 if ( 'TEXTAREA' === e.target.nodeName || 'INPUT' === e.target.nodeName ) { 198 if ( -1 !== modifierKeyCodes.indexOf( e.key ) ) { 199 modifierKeys.push( keypresses.length - 1 ); 200 } else if ( -1 !== correctionKeyCodes.indexOf( e.key ) ) { 201 correctionKeys.push( keypresses.length - 1 ); 202 } else { 203 // ^ Don't record timings for keys like Shift or backspace, since they 204 // typically get held down for longer than regular typing. 205 206 var keydownTime = keydowns[ e.key ][0]; 207 208 var keypress = []; 209 210 // Keypress duration. 211 keypress.push( keyupTime - keydownTime ); 212 213 // Amount of time between this keypress and the previous keypress. 214 if ( keydowns[ e.key ].length > 1 ) { 215 keypress.push( keydowns[ e.key ][1] ); 216 } 217 218 keypresses.push( keypress ); 219 } 220 } 221 222 delete keydowns[ e.key ]; 223 224 lastKeyup = keyupTime; 225 }, supportsPassive ? { passive: true } : false ); 226 227 form.addEventListener( "focusin", function ( e ) { 228 lastKeydown = null; 229 lastKeyup = null; 230 keydowns = {}; 231 }, supportsPassive ? { passive: true } : false ); 232 233 form.addEventListener( "focusout", function ( e ) { 234 lastKeydown = null; 235 lastKeyup = null; 236 keydowns = {}; 237 }, supportsPassive ? { passive: true } : false ); 238 } 239 240 document.addEventListener( 'mousedown', function ( e ) { 241 lastMousedown = ( new Date() ).getTime(); 242 243 if ( lastMousemoveTime ) { 244 intervalsBetweenMousemovesAndClicks.push( lastMousedown - lastMousemoveTime ); 245 } 246 247 var mouseclickCoordinate = []; 248 249 var rect = e.target.getBoundingClientRect(); 250 var relativeX = e.clientX - rect.left; 251 var relativeY = e.clientY - rect.top; 252 253 // Pixel offset of the click within the target element. 254 mouseclickCoordinate.push( Math.round( relativeX ) ); 255 mouseclickCoordinate.push( Math.round( relativeY ) ); 256 257 // Percentage offset of the click within the target element. 258 mouseclickCoordinate.push( rect.width > 0 ? Math.round( relativeX / rect.width * 100 ) : 0 ); 259 mouseclickCoordinate.push( rect.height > 0 ? Math.round( relativeY / rect.height * 100 ) : 0 ); 260 261 mouseclickCoordinates.push( mouseclickCoordinate ); 262 }, supportsPassive ? { passive: true } : false ); 263 264 document.addEventListener( 'mouseup', function ( e ) { 265 if ( ! lastMousedown ) { 266 // If the mousedown happened before this script was loaded, but the mouseup happened after... 267 return; 268 } 269 270 var now = ( new Date() ).getTime(); 271 272 var mouseclick = []; 273 mouseclick.push( now - lastMousedown ); 274 275 if ( lastMouseup ) { 276 mouseclick.push( lastMousedown - lastMouseup ); 277 } 278 279 mouseclicks.push( mouseclick ); 280 281 lastMouseup = now; 282 283 // If the mouse has been clicked, don't record this time as an interval between keypresses. 284 lastKeydown = null; 285 lastKeyup = null; 286 keydowns = {}; 287 }, supportsPassive ? { passive: true } : false ); 288 289 document.addEventListener( 'mousemove', function ( e ) { 290 lastMousemoveTime = ( new Date() ).getTime(); 291 292 if ( mousemoveTimer ) { 293 clearTimeout( mousemoveTimer ); 294 mousemoveTimer = null; 295 } 296 else { 297 mousemoveStart = lastMousemoveTime; 298 lastMousemoveX = e.offsetX; 299 lastMousemoveY = e.offsetY; 300 } 301 302 mousemoveTimer = setTimeout( function ( theEvent, originalMousemoveStart ) { 303 var now = ( new Date() ).getTime() - 500; // To account for the timer delay. 304 305 var mousemove = []; 306 mousemove.push( now - originalMousemoveStart ); 307 mousemove.push( 308 Math.round( 309 Math.sqrt( 310 Math.pow( theEvent.offsetX - lastMousemoveX, 2 ) + 311 Math.pow( theEvent.offsetY - lastMousemoveY, 2 ) 312 ) 313 ) 314 ); 315 316 if ( mousemove[1] > 0 ) { 317 // If there was no measurable distance, then it wasn't really a move. 318 mousemoves.push( mousemove ); 319 } 320 321 mousemoveStart = null; 322 mousemoveTimer = null; 323 }, 500, e, mousemoveStart ); 324 }, supportsPassive ? { passive: true } : false ); 325 326 document.addEventListener( 'touchmove', function ( e ) { 327 if ( touchmoveCountTimer ) { 328 clearTimeout( touchmoveCountTimer ); 329 } 330 331 touchmoveCountTimer = setTimeout( function () { 332 touchmoveCount++; 333 }, 500 ); 334 }, supportsPassive ? { passive: true } : false ); 335 336 document.addEventListener( 'touchstart', function ( e ) { 337 lastTouchStart = ( new Date() ).getTime(); 338 }, supportsPassive ? { passive: true } : false ); 339 340 document.addEventListener( 'touchend', function ( e ) { 341 if ( ! lastTouchStart ) { 342 // If the touchstart happened before this script was loaded, but the touchend happened after... 343 return; 344 } 345 346 var now = ( new Date() ).getTime(); 347 348 var touchEvent = []; 349 touchEvent.push( now - lastTouchStart ); 350 351 if ( lastTouchEnd ) { 352 touchEvent.push( lastTouchStart - lastTouchEnd ); 353 } 354 355 touchEvents.push( touchEvent ); 356 357 lastTouchEnd = now; 358 359 // Don't record this time as an interval between keypresses. 360 lastKeydown = null; 361 lastKeyup = null; 362 keydowns = {}; 363 }, supportsPassive ? { passive: true } : false ); 364 365 document.addEventListener( 'scroll', function ( e ) {
366 if ( scrollCountTimer ) { 367 clearTimeout( scrollCountTimer ); 368 } 369 370 scrollCountTimer = setTimeout( function () { 371 scrollCount++; 372 }, 500 ); 373 }, supportsPassive ? { passive: true } : false ); 374 } 375 376 /** 377 * For the timing/coordinate data that is collected, don't send more than `limit` data points in the request. 378 * Choose a random slice and send those, with each batch separated by semicolons and the items in each batch 379 * separated by commas. 380 */ 381 function prepare_array_for_request( a, limit ) { 382 if ( ! limit ) { 383 limit = 100; 384 } 385 386 var rv = ''; 387 388 if ( a.length > 0 ) { 389 var random_starting_point = Math.max( 0, Math.floor( Math.random() * a.length - limit ) ); 390 391 for ( var i = 0; i < limit && i < a.length; i++ ) { 392 var entry = a[ random_starting_point + i ]; 393 rv += entry.join( ',' ) + ';'; 394 } 395 } 396 397 return rv; 398 } 399 400 if ( document.readyState !== 'loading' ) { 401 init(); 402 } else { 403 document.addEventListener( 'DOMContentLoaded', init ); 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Line numbers count LF bytes from the start of the resource, as the search results do. Vendor segments are library code the classifier recognised; they are stored but not indexed. Bytes are shown as Latin1 characters, one per byte.