Modifying ConfirmEdit extension to make it API-friendly:

* Hooking into the APIEditBeforeSave hook (which will appear in the ApiEdit_Vodafone branch in the next revision)
* Moved general CAPTCHA generation in SimpleCaptcha to getCaptcha()
* Moved general confirmEdit() functionality to doConfirmEdit() to facilitate differtiating between UI and API handling
* Adding SimpleCaptcha::addCaptchaAPI() method that adds CAPTCHA information to an API result array. Other CAPTCHA implementations should override this method with a function that does the same (did this for FancyCaptcha and MathCaptcha)

ConfirmEdit.php

@@ -166,7 +166,6 @@ $wgCaptchaWhitelist = false;
 $wgCaptchaRegexes = array();
 
 /** Register special page */
-global $wgSpecialPages;
 $wgSpecialPages['Captcha'] = array( /*class*/'CaptchaSpecialPage', /*name*/'Captcha' );
 
 $wgConfirmEditIP = dirname( __FILE__ );
@@ -182,6 +181,8 @@ $wgHooks['AbortNewAccount'][] = 'ConfirmEditHooks::confirmUserCreate';
 $wgHooks['LoginAuthenticateAudit'][] = 'ConfirmEditHooks::triggerUserLogin';
 $wgHooks['UserLoginForm'][] = 'ConfirmEditHooks::injectUserLogin';
 $wgHooks['AbortLogin'][] = 'ConfirmEditHooks::confirmUserLogin';
+# Register API hook
+$wgHooks['APIEditBeforeSave'][] = 'ConfirmEditHooks::confirmEditAPI';
 
 $wgAutoloadClasses['ConfirmEditHooks'] 
 	= $wgAutoloadClasses['SimpleCaptcha'] 

ConfirmEdit_body.php

@@ -22,6 +22,10 @@ class ConfirmEditHooks {
 	static function confirmEditMerged( &$editPage, $newtext ) {
 		return self::getInstance()->confirmEditMerged( $editPage, $newtext );
 	}
+	
+	static function confirmEditAPI( &$editPage, $newtext, &$resultArr ) {
+		return self::getInstance()->confirmEditAPI( $editPage, $newtext, $resultArr );
+	}
 
 	static function injectUserCreate( &$template ) {
 		return self::getInstance()->injectUserCreate( $template );
@@ -65,6 +69,24 @@ class SimpleCaptcha {
 		$this->storage = new $wgCaptchaStorageClass;
 	}
 	
+	function getCaptcha() {
+		$a = mt_rand(0, 100);
+		$b = mt_rand(0, 10);
+		$op = mt_rand(0, 1) ? '+' : '-';
+
+		$test = "$a $op $b";
+		$answer = ($op == '+') ? ($a + $b) : ($a - $b);
+		return array('question' => $test, 'answer' => $answer);
+	}
+	
+	function addCaptchaAPI(&$resultArr) {
+		$captcha = $this->getCaptcha();
+		$index = $this->storeCaptcha( $captcha );
+		$resultArr['captcha']['type'] = 'simple';
+		$resultArr['captcha']['id'] = $index;
+		$resultArr['captcha']['question'] = $captcha['question'];
+	}
+	
 	/**
 	 * Insert a captcha prompt into the edit form.
 	 * This sample implementation generates a simple arithmetic operation;
@@ -75,16 +97,10 @@ class SimpleCaptcha {
 	 * @return string HTML
 	 */
 	function getForm() {
-		$a = mt_rand(0, 100);
-		$b = mt_rand(0, 10);
-		$op = mt_rand(0, 1) ? '+' : '-';
+		$captcha = $this->getCaptcha();
+		$index = $this->storeCaptcha( $captcha );
 
-		$test = "$a $op $b";
-		$answer = ($op == '+') ? ($a + $b) : ($a - $b);
-
-		$index = $this->storeCaptcha( array( 'answer' => $answer ) );
-
-		return "<p><label for=\"wpCaptchaWord\">$test</label> = " .
+		return "<p><label for=\"wpCaptchaWord\">{$captcha['question']}</label> = " .
 			wfElement( 'input', array(
 				'name' => 'wpCaptchaWord',
 				'id'   => 'wpCaptchaWord',
@@ -430,21 +446,17 @@ class SimpleCaptcha {
 			$links[] = $row->el_to;
 		}
 		return $links;
-	}		
-
+	}
+	
 	/**
-	 * The main callback run on edit attempts.
-	 * @param EditPage $editPage
-	 * @param string $newtext
-	 * @param string $section
-	 * @param bool true to continue saving, false to abort and show a captcha form
+	 * Backend function for confirmEdit() and confirmEditAPI()
+	 * @return bool false if the CAPTCHA is rejected, true otherwise
 	 */
-	function confirmEdit( &$editPage, $newtext, $section, $merged = false ) {
+	private function doConfirmEdit( &$editPage, $newtext, $section, $merged = false ) {
 		if( $this->shouldCheck( $editPage, $newtext, $section, $merged ) ) {
 			if( $this->passCaptcha() ) {
 				return true;
 			} else {
-				$editPage->showEditForm( array( &$this, 'editCallback' ) );
 				return false;
 			}
 		} else {
@@ -453,6 +465,28 @@ class SimpleCaptcha {
 		}
 	}
 
+	/**
+	 * The main callback run on edit attempts.
+	 * @param EditPage $editPage
+	 * @param string $newtext
+	 * @param string $section
+	 * @param bool $merged
+	 * @return bool true to continue saving, false to abort and show a captcha form
+	 */
+	function confirmEdit( &$editPage, $newtext, $section, $merged = false ) {
+		global $wgTitle;
+		if( is_null( $wgTitle ) ) {
+			# API mode
+			# The CAPTCHA was already checked and approved 
+			return true;
+		}
+		if( !$this->doConfirmEdit( $editPage, $newtext, $section, $merged ) ) {
+			$editPage->showEditForm( array( &$this, 'editCallback' ) );
+			return false;
+		}
+		return true;
+	}
+
 	/**
 	 * A more efficient edit filter callback based on the text after section merging
 	 * @param EditPage $editPage
@@ -461,6 +495,15 @@ class SimpleCaptcha {
 	function confirmEditMerged( &$editPage, $newtext ) {
 		return $this->confirmEdit( $editPage, $newtext, false, true );
 	}
+	
+	
+	function confirmEditAPI( &$editPage, $newtext, &$resultArr) {
+		if( !$this->doConfirmEdit( $editPage, $newtext, false, false ) ) {
+			$this->addCaptchaAPI($resultArr);
+			return false;
+		}
+		return true;
+	}
 
 	/**
 	 * Hook for user creation form submissions.

FancyCaptcha.class.php

@@ -24,6 +24,19 @@ class FancyCaptcha extends SimpleCaptcha {
 		}
 	}
 
+	function addCaptchaAPI(&$resultArr) {
+		$info = $this->pickImage();
+		if( !$info ) {
+			$resultArr['captcha']['error'] = 'Out of images';
+			return;
+		}
+		$index = $this->storeCaptcha( $info );
+		$title = Title::makeTitle( NS_SPECIAL, 'Captcha/image' );
+		$resultArr['captcha']['type'] = 'image';
+		$resultArr['captcha']['id'] = $index;
+		$resultArr['captcha']['url'] = $title->getLocalUrl( 'wpCaptchaId=' . urlencode( $index ) );		
+	}
+
 	/**
 	 * Insert the captcha prompt into the edit form.
 	 */

MathCaptcha.class.php

@@ -6,6 +6,14 @@ class MathCaptcha extends SimpleCaptcha {
 	function keyMatch( $answer, $info ) {
 		return (int)$answer == (int)$info['answer'];
 	}
+
+	function addCaptchaAPI(&$resultArr) {
+		list( $sum, $answer ) = $this->pickSum();
+		$index = $this->storeCaptcha( array('answer' => $answer ) );
+		$resultArr['captcha']['type'] = 'math';
+		$resultArr['captcha']['id'] = $index;
+		$resultArr['captcha']['sum'] = $sum;
+	}
 	
 	/** Produce a nice little form */
 	function getForm() {