oAuth2 & gemini API sample code

Author: Saurabh Sahni

YahooOAuth2.class.php

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+<?php
+/*
+Example class to access Yahoo OAuth2 protected APIs, based on https://developer.yahoo.com/oauth2/guide/
+Find documentation and support on Yahoo Developer Network: https://developer.yahoo.com/forums
+
+*/
+
+class YahooOAuth2
+{
+
+  const AUTHORIZATION_ENDPOINT  = 'https://api.login.yahoo.com/oauth2/request_auth';
+  const TOKEN_ENDPOINT   = 'https://api.login.yahoo.com/oauth2/get_token';
+
+  public function fetch($url,$postdata="",$auth="",$headers="")
+  {
+        $curl = curl_init($url); 
+		if($postdata) {
+        	curl_setopt($curl, CURLOPT_POST, true); 
+	        curl_setopt($curl, CURLOPT_POSTFIELDS, $postdata); 
+		} else {
+			curl_setopt($curl, CURLOPT_POST, false);
+		}
+		if($auth){
+	        curl_setopt($curl, CURLOPT_USERPWD, $auth);
+		}
+		if($headers){
+			curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
+		}
+		curl_setopt($curl, CURLOPT_HEADER, false);
+        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); 
+        $response = curl_exec( $curl );
+        if (empty($response)) {
+            // some kind of an error happened
+            die(curl_error($curl));
+            curl_close($curl); // close cURL handler
+        } else {
+            $info = curl_getinfo($curl);
+            curl_close($curl); // close cURL handler
+                if($info['http_code'] != 200 && $info['http_code'] != 201 ) {
+                        echo "Received error: " . $info['http_code']. "\n";
+                        echo "Raw response:".$response."\n";
+                        die();
+            }
+        }
+        return $response;
+  }
+  public function getAuthorizationURL($client_id,$redirect_uri,$language="en-us")
+  {
+    $url = self::AUTHORIZATION_ENDPOINT;
+    $authorization_url=$url.'?'.'client_id='.$client_id.'&redirect_uri='.$redirect_uri.'&language='.$language.'&response_type=code';
+    return $authorization_url;
+  }
+
+
+  public function get_access_token($clientId, $clientSecret,$redirect_uri,$code) {
+        $url=self::TOKEN_ENDPOINT;
+        $postdata=array("redirect_uri"=>$redirect_uri,"code"=>$code,"grant_type"=>"authorization_code");
+		$auth=$clientId . ":" . $clientSecret;
+        $response=self::fetch($url,$postdata,$auth); 
+
+		// Convert the result from JSON format to a PHP array 
+		$jsonResponse = json_decode( $response );
+		return $jsonResponse->access_token;
+  }
+
+}
+
+?>

index.php

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+<?php
+/* Example code to access Gemini API: Fetch advertiser information, create a new campaign and read specific campaign data*/
+
+require "YahooOAuth2.class.php"; #Download here: https://github.com/saurabhsahni/php-yahoo-oauth2/
+
+/*Your Yahoo API consumer key & secret with access to Gemini data */
+
+define("CONSUMER_KEY","<your consumer key>");
+define("CONSUMER_SECRET","<your consumer secret>");
+$redirect_uri="http://".$_SERVER['SERVER_NAME'] . $_SERVER['PHP_SELF'];//Or your other redirect URL - must match the callback domain 
+
+$gemini_api_endpoint="https://api.admanager.yahoo.com/v1/rest";
+
+$oauth2client=new YahooOAuth2();
+
+if (isset($_GET['code'])){
+	$code=$_GET['code'];	
+} 
+else {
+	$code=0;
+}
+
+if($code){
+	 #oAuth 3-legged authorization is successful, fetch access token 	
+	 $token=$oauth2client->get_access_token(CONSUMER_KEY,CONSUMER_SECRET,$redirect_uri,$code);
+
+	 #access token is available. Do API calls.	 
+
+	 $headers= array(
+					'Authorization: Bearer '.$token,
+					'Accept: application/json',
+					'Content-Type: application/json'
+					);
+
+	 //Fetch Advertiser Name and Advertiser ID
+	 $url=$gemini_api_endpoint."/advertiser/";
+
+	 $resp=$oauth2client->fetch($url,$postdata="",$auth="",$headers);
+	 $jsonResponse = json_decode( $resp);
+	 $advertiserName = $jsonResponse->response[0]->advertiserName; 
+	 $advertiserId = $jsonResponse->response[0]->id; 
+	 echo "Welcome ".$advertiserName;
+
+	 //Create a new campaign
+	 $url=$gemini_api_endpoint."/campaign";
+	 $postdata='{
+	  "status":"PAUSED",
+	  "campaignName":"NativeAdsCampaign",
+	  "budget": 3000,
+	  "budgetType": "LIFETIME",
+	  "advertiserId": '.$advertiserId.',
+	  "channel":"NATIVE"
+	  }';
+
+	 $resp=$oauth2client->fetch($url,$postdata=$postdata,$auth="",$headers);
+	 $jsonResponse = json_decode( $resp);
+
+	 $campaignID=$jsonResponse->response->id;
+	 $campaignName=$jsonResponse->response->campaignName;
+
+	 echo "\n<br>Created a new campaign with ID: ".$campaignID;
+
+	 //Read specific campaign data
+	 $url=$gemini_api_endpoint."/campaign/".$campaignID;
+	 $resp=$oauth2client->fetch($url,$postdata="",$auth="",$headers);
+	 $jsonResponse = json_decode( $resp);
+	 echo "\n<br> Campaign object:<br>\n";
+	 print_r($jsonResponse->response);
+}
+else {
+    /* no valid access token available, go to authorization server */
+    header("HTTP/1.1 302 Found");
+    header("Location: " . $oauth2client->getAuthorizationURL(CONSUMER_KEY,$redirect_uri));
+    exit;
+}
+
+?>
+