old-dialogflow.php

<?php
//                                 Apache License
//                            Version 2.0, January 2004
//                         http://www.apache.org/licenses/

//    Copyright 2021 sumithemmadi
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at

//        http://www.apache.org/licenses/LICENSE-2.0

//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.

namespace Google\Cloud\Samples\Dialogflow;

use Google\Cloud\Dialogflow\V2\SessionsClient;
use Google\Cloud\Dialogflow\V2\TextInput;
use Google\Cloud\Dialogflow\V2\QueryInput;

require __DIR__ . "/vendor/autoload.php";

header("Access-Control-Allow-Origin: *");
header("Content-Type: application/json; charset=UTF-8");
header("Access-Control-Allow-Methods: POST");
header("Access-Control-Max-Age: 3600");
header(
    "Access-Control-Allow-Headers: Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With"
);

// Save Google Account Credentials json file as 'service-account-file.json'
//make sure that Google Account Credentials JSON file and this file are in same directory.
$google_application_credentials = "[GOOGLE_APPLICATION_CREDENTIALS_FILENAME]";

//PROJECT ID
// Please Change "[ENTER_PROJECT_ID]" with you dialogflow project ID
$projectId = "[ENTER_PROJECT_ID]";

if (
    $google_application_credentials ==
        "[GOOGLE_APPLICATION_CREDENTIALS_FILENAME]" &&
    $projectId == "[ENTER_PROJECT_ID]"
) {
    echo "\n\nERROR\n\n";
    echo "1 . Please enter the filename of Google Account Credentials JSON file in dialogflow.php file at LINE NO : 36\n";
    echo "2 . Please enter project ID in dialogflow.php file at LINE NO : 40\n";
    exit();
}

if (
    $google_application_credentials ==
    "[GOOGLE_APPLICATION_CREDENTIALS_FILENAME]"
) {
    echo "\n\nERROR\n\n";
    echo "1 . Please enter the filename of Google Account Credentials JSON file in dialogflow.php file at LINE NO : 36\n";
    exit();
}

if ($projectId == "[ENTER_PROJECT_ID]") {
    echo "\n\nERROR\n\n";
    echo "1 . Please enter project ID in dialogflow.php file at LINE NO : 40\n";
    exit();
}

$data = json_decode(file_get_contents("php://input"));

// Function to get JSON response.
function get_response(
    $projectId,
    $google_application_credentials,
    $text,
    $sessionId
) {
    // new session
    $test = [
        "credentials" => $google_application_credentials,
    ];
    $sessionsClient = $sessionId;
    $sessionsClient = new SessionsClient($test);
    $session = $sessionsClient->sessionName($projectId, $sessionId);

    // create text input
    $textInput = new TextInput();
    $textInput->setText($text);
    // set language
    $textInput->setLanguageCode("en-US");

    // create query input
    $queryInput = new QueryInput();
    $queryInput->setText($textInput);

    // Response
    $dialogflow_response = $sessionsClient->detectIntent($session, $queryInput);
    $json_resp = $dialogflow_response->serializeToJsonString();
    $json_response = json_encode(json_decode($json_resp), JSON_PRETTY_PRINT);

    $sessionsClient->close();
    return $json_response;
}

if (!empty($data->message)) {
    if (!empty($data->sid)) {
        //sessionId
        $sessionId = $data->sid;
    } else {
        // Generate Random Session ID if sid object is not found in JSON post request.
        $sessionId = uniqid("sid-");
    }
    $text = $data->message;
    http_response_code(200);
    $response = get_response(
        $projectId,
        $google_application_credentials,
        $text,
        $sessionId
    );
    echo $response;
} elseif (!empty($argv[1])) {
    $sessionId = uniqid("sid-");
    $text = $argv[1];
    $response = get_response(
        $projectId,
        $google_application_credentials,
        $text,
        $sessionId
    );
    echo $response;
} else {
    http_response_code(400);
    // Error
    echo "Error ❌";
}
?>