<?php
/**
* Google AI Gemini API integration
*/
namespace Classifai\Providers\GoogleAI;
use Classifai\Features\ContentResizing;
use Classifai\Features\ExcerptGeneration;
use Classifai\Features\TitleGeneration;
use Classifai\Providers\Provider;
use Classifai\Normalizer;
use WP_Error;
use function Classifai\get_default_prompt;
class GeminiAPI extends Provider {
/**
* Provider ID
*
* @var string
*/
const ID = 'googleai_gemini_api';
/**
* Gemini API URL
*
* @var string
*/
protected $googleai_url = 'https://generativelanguage.googleapis.com/v1beta';
/**
* GeminiAPI model
*
* @var string
*/
protected $googleai_model = 'models/gemini-pro';
/**
* GeminiAPI constructor.
*
* @param \Classifai\Features\Feature $feature_instance The feature instance.
*/
public function __construct( $feature_instance = null ) {
$this->feature_instance = $feature_instance;
}
/**
* Render the provider fields.
*/
public function render_provider_fields() {
$settings = $this->feature_instance->get_settings( static::ID );
add_settings_field(
static::ID . '_api_key',
esc_html__( 'API Key', 'classifai' ),
[ $this->feature_instance, 'render_input' ],
$this->feature_instance->get_option_name(),
$this->feature_instance->get_option_name() . '_section',
[
'option_index' => static::ID,
'label_for' => 'api_key',
'input_type' => 'password',
'default_value' => $settings['api_key'],
'class' => 'classifai-provider-field hidden provider-scope-' . static::ID, // Important to add this.
'description' => sprintf(
wp_kses(
/* translators: %1$s is replaced with the OpenAI sign up URL */
__( 'Don\'t have an Google AI (Gemini API) key? <a title="Get an API key" href="%1$s">Get an API key</a> now.', 'classifai' ),
[
'a' => [
'href' => [],
'title' => [],
],
]
),
esc_url( 'https://makersuite.google.com/app/apikey' )
),
]
);
do_action( 'classifai_' . static::ID . '_render_provider_fields', $this );
}
/**
* Returns the default settings for this provider.
*
* @return array
*/
public function get_default_provider_settings(): array {
$common_settings = [
'api_key' => '',
'authenticated' => false,
];
return $common_settings;
}
/**
* Sanitize the settings for this provider.
*
* @param array $new_settings The settings array.
* @return array
*/
public function sanitize_settings( array $new_settings ): array {
$settings = $this->feature_instance->get_settings();
$api_key_settings = $this->sanitize_api_key_settings( $new_settings, $settings );
$new_settings[ static::ID ]['api_key'] = $api_key_settings[ static::ID ]['api_key'];
$new_settings[ static::ID ]['authenticated'] = $api_key_settings[ static::ID ]['authenticated'];
return $new_settings;
}
/**
* Sanitize the API key, showing an error message if needed.
*
* @param array $new_settings Incoming settings, if any.
* @param array $settings Current settings, if any.
* @return array
*/
public function sanitize_api_key_settings( array $new_settings = [], array $settings = [] ): array {
$authenticated = $this->authenticate_credentials( $new_settings[ static::ID ]['api_key'] ?? '' );
$new_settings[ static::ID ]['authenticated'] = $settings[ static::ID ]['authenticated'];
if ( is_wp_error( $authenticated ) ) {
$new_settings[ static::ID ]['authenticated'] = false;
$error_message = $authenticated->get_error_message();
// Add an error message.
add_settings_error(
'api_key',
'classifai-auth',
$error_message,
'error'
);
} else {
$new_settings[ static::ID ]['authenticated'] = true;
}
$new_settings[ static::ID ]['api_key'] = sanitize_text_field( $new_settings[ static::ID ]['api_key'] ?? $settings[ static::ID ]['api_key'] );
return $new_settings;
}
/**
* Authenticate our credentials.
*
* @param string $api_key Api Key.
* @return bool|WP_Error
*/
protected function authenticate_credentials( string $api_key = '' ) {
// Check that we have credentials before hitting the API.
if ( empty( $api_key ) ) {
return new WP_Error( 'auth', esc_html__( 'Please enter your Google AI (Gemini API) key.', 'classifai' ) );
}
// Make request to ensure credentials work.
$request = new APIRequest( $api_key );
$response = $request->get( $this->googleai_url . '/models' );
return ! is_wp_error( $response ) ? true : $response;
}
/**
* Sanitize the API key.
*
* @param array $new_settings The settings array.
* @return string
*/
public function sanitize_api_key( array $new_settings ): string {
$settings = $this->feature_instance->get_settings();
return sanitize_text_field( $new_settings[ static::ID ]['api_key'] ?? $settings[ static::ID ]['api_key'] ?? '' );
}
/**
* Common entry point for all REST endpoints for this provider.
*
* @param int $post_id The Post ID we're processing.
* @param string $route_to_call The route we are processing.
* @param array $args Optional arguments to pass to the route.
* @return string|WP_Error
*/
public function rest_endpoint_callback( $post_id = 0, string $route_to_call = '', array $args = [] ) {
if ( ! $post_id || ! get_post( $post_id ) ) {
return new WP_Error( 'post_id_required', esc_html__( 'A valid post ID is required to generate titles.', 'classifai' ) );
}
$route_to_call = strtolower( $route_to_call );
$return = '';
// Handle all of our routes.
switch ( $route_to_call ) {
case 'excerpt':
$return = $this->generate_excerpt( $post_id, $args );
break;
case 'title':
$return = $this->generate_titles( $post_id, $args );
break;
case 'resize_content':
$return = $this->resize_content( $post_id, $args );
break;
}
return $return;
}
/**
* Generate an excerpt using Google AI (Gemini API).
*
* @param int $post_id The Post ID we're processing
* @param array $args Arguments passed in.
* @return string|WP_Error
*/
public function generate_excerpt( int $post_id = 0, array $args = [] ) {
if ( ! $post_id || ! get_post( $post_id ) ) {
return new WP_Error( 'post_id_required', esc_html__( 'A valid post ID is required to generate an excerpt.', 'classifai' ) );
}
$feature = new ExcerptGeneration();
$settings = $feature->get_settings();
$args = wp_parse_args(
array_filter( $args ),
[
'content' => '',
'title' => get_the_title( $post_id ),
]
);
// These checks (and the one above) happen in the REST permission_callback,
// but we run them again here in case this method is called directly.
if ( empty( $settings ) || ( isset( $settings[ static::ID ]['authenticated'] ) && false === $settings[ static::ID ]['authenticated'] ) || ( ! $feature->is_feature_enabled() && ( ! defined( 'WP_CLI' ) || ! WP_CLI ) ) ) {
return new WP_Error( 'not_enabled', esc_html__( 'Excerpt generation is disabled or Google AI authentication failed. Please check your settings.', 'classifai' ) );
}
$excerpt_length = absint( $settings['length'] ?? 55 );
$request = new APIRequest( $settings[ static::ID ]['api_key'] ?? '', $feature->get_option_name() );
$excerpt_prompt = esc_textarea( get_default_prompt( $settings['generate_excerpt_prompt'] ) ?? $feature->prompt );
// Replace our variables in the prompt.
$prompt_search = array( '{{WORDS}}', '{{TITLE}}' );
$prompt_replace = array( $excerpt_length, $args['title'] );
$prompt = str_replace( $prompt_search, $prompt_replace, $excerpt_prompt );
/**
* Filter the prompt we will send to Gemini API.
*
* @since 3.0.0
* @hook classifai_googleai_gemini_api_excerpt_prompt
*
* @param {string} $prompt Prompt we are sending to Gemini API. Gets added before post content.
* @param {int} $post_id ID of post we are summarizing.
* @param {int} $excerpt_length Length of final excerpt.
*
* @return {string} Prompt.
*/
$prompt = apply_filters( 'classifai_googleai_gemini_api_excerpt_prompt', $prompt, $post_id, $excerpt_length );
/**
* Filter the request body before sending to Gemini API.
*
* @since 3.0.0
* @hook classifai_googleai_gemini_api_excerpt_request_body
*
* @param {array} $body Request body that will be sent to Gemini API.
* @param {int} $post_id ID of post we are summarizing.
*
* @return {array} Request body.
*/
$body = apply_filters(
'classifai_googleai_gemini_api_excerpt_request_body',
[
'contents' => [
[
'parts' => [
'text' => 'You will be provided with content delimited by triple quotes. ' . $prompt . ' \n """' . $this->get_content( $post_id, false, $args['content'] ) . '"""',
],
],
],
'generationConfig' => [
'temperature' => 0.9,
'topK' => 1,
'topP' => 1,
'maxOutputTokens' => 2048,
],
],
$post_id
);
// Make our API request.
$response = $request->post(
$this->googleai_url . '/' . $this->googleai_model . ':generateContent',
[
'body' => wp_json_encode( $body ),
]
);
set_transient( 'classifai_googleai_gemini_api_excerpt_generation_latest_response', $response, DAY_IN_SECONDS * 30 );
// Extract out the text response, if it exists.
if ( ! is_wp_error( $response ) && ! empty( $response['candidates'] ) ) {
foreach ( $response['candidates'] as $candidate ) {
if ( isset( $candidate['content'], $candidate['content']['parts'] ) ) {
$parts = $candidate['content']['parts'];
$response = sanitize_text_field( trim( $parts[0]['text'], ' "\'' ) );
}
}
}
return $response;
}
/**
* Generate titles using Google AI (Gemini API).
*
* @param int $post_id The Post Id we're processing
* @param array $args Arguments passed in.
* @return string|WP_Error
*/
public function generate_titles( int $post_id = 0, array $args = [] ) {
if ( ! $post_id || ! get_post( $post_id ) ) {
return new WP_Error( 'post_id_required', esc_html__( 'Post ID is required to generate titles.', 'classifai' ) );
}
$feature = new TitleGeneration();
$settings = $feature->get_settings();
$args = wp_parse_args(
array_filter( $args ),
[
'num' => 1, // Gemini API only returns 1 title.
'content' => '',
]
);
// These checks happen in the REST permission_callback,
// but we run them again here in case this method is called directly.
if ( empty( $settings ) || ( isset( $settings[ static::ID ]['authenticated'] ) && false === $settings[ static::ID ]['authenticated'] ) || ! $feature->is_feature_enabled() ) {
return new WP_Error( 'not_enabled', esc_html__( 'Title generation is disabled or Google AI authentication failed. Please check your settings.', 'classifai' ) );
}
$request = new APIRequest( $settings[ static::ID ]['api_key'] ?? '', $feature->get_option_name() );
$prompt = esc_textarea( get_default_prompt( $settings['generate_title_prompt'] ) ?? $feature->prompt );
/**
* Filter the prompt we will send to Gemini API.
*
* @since 3.0.0
* @hook classifai_googleai_gemini_api_title_prompt
*
* @param {string} $prompt Prompt we are sending to Gemini API. Gets added before post content.
* @param {int} $post_id ID of post we are summarizing.
* @param {array} $args Arguments passed to endpoint.
*
* @return {string} Prompt.
*/
$prompt = apply_filters( 'classifai_googleai_gemini_api_title_prompt', $prompt, $post_id, $args );
/**
* Filter the request body before sending to Gemini API.
*
* @since 3.0.0
* @hook classifai_googleai_gemini_api_title_request_body
*
* @param {array} $body Request body that will be sent to Gemini API.
* @param {int} $post_id ID of post we are summarizing.
*
* @return {array} Request body.
*/
$body = apply_filters(
'classifai_googleai_gemini_api_title_request_body',
[
'contents' => [
[
'parts' => [
'text' => 'You will be provided with content delimited by triple quotes. ' . $prompt . '\n"""' . $this->get_content( $post_id, false, $args['content'] ) . '"""',
],
],
],
'generationConfig' => [
'temperature' => 0.9,
'topK' => 1,
'topP' => 1,
'maxOutputTokens' => 2048,
],
],
$post_id
);
// Make our API request.
$response = $request->post(
$this->googleai_url . '/' . $this->googleai_model . ':generateContent',
[
'body' => wp_json_encode( $body ),
]
);
set_transient( 'classifai_googleai_gemini_api_title_generation_latest_response', $response, DAY_IN_SECONDS * 30 );
if ( is_wp_error( $response ) ) {
return $response;
}
if ( empty( $response['candidates'] ) ) {
return new WP_Error( 'no_choices', esc_html__( 'No choices were returned from Google AI.', 'classifai' ) );
}
// Extract out the text response.
$return = [];
foreach ( $response['candidates'] as $candidate ) {
if ( isset( $candidate['content'], $candidate['content']['parts'] ) ) {
$parts = $candidate['content']['parts'];
$return[] = sanitize_text_field( trim( $parts[0]['text'], ' "\'' ) );
}
}
return $return;
}
/**
* Resizes content.
*
* @param int $post_id The Post Id we're processing
* @param array $args Arguments passed in.
* @return string|WP_Error
*/
public function resize_content( int $post_id, array $args = array() ) {
if ( ! $post_id || ! get_post( $post_id ) ) {
return new WP_Error( 'post_id_required', esc_html__( 'Post ID is required to resize content.', 'classifai' ) );
}
$feature = new ContentResizing();
$settings = $feature->get_settings();
$args = wp_parse_args(
array_filter( $args ),
[
'num' => 1, // Gemini API only returns 1 variation as of now.
]
);
$request = new APIRequest( $settings[ static::ID ]['api_key'] ?? '', $feature->get_option_name() );
if ( 'shrink' === $args['resize_type'] ) {
$prompt = esc_textarea( get_default_prompt( $settings['condense_text_prompt'] ) ?? $feature->condense_prompt );
} else {
$prompt = esc_textarea( get_default_prompt( $settings['expand_text_prompt'] ) ?? $feature->expand_prompt );
}
/**
* Filter the resize prompt we will send to Gemini API.
*
* @since 3.0.0
* @hook classifai_googleai_gemini_api_' . $args['resize_type'] . '_content_prompt
*
* @param {string} $prompt Resize prompt we are sending to Gemini API. Gets added as a system prompt.
* @param {int} $post_id ID of post.
* @param {array} $args Arguments passed to endpoint.
*
* @return {string} Prompt.
*/
$prompt = apply_filters( 'classifai_googleai_gemini_api_' . $args['resize_type'] . '_content_prompt', $prompt, $post_id, $args );
/**
* Filter the resize request body before sending to Gemini API.
*
* @since 2.3.0
* @hook classifai_googleai_gemini_api_resize_content_request_body
*
* @param {array} $body Request body that will be sent to Gemini API.
* @param {int} $post_id ID of post.
*
* @return {array} Request body.
*/
$body = apply_filters(
'classifai_googleai_gemini_api_resize_content_request_body',
[
'contents' => [
[
'parts' => [
'text' => 'You will be provided with content delimited by triple quotes. ' . $prompt . '\n"""' . esc_html( $args['content'] ) . '"""',
],
],
],
'generationConfig' => [
'temperature' => 0.9,
'topK' => 1,
'topP' => 1,
'maxOutputTokens' => 2048,
],
],
$post_id
);
// Make our API request.
$response = $request->post(
$this->googleai_url . '/' . $this->googleai_model . ':generateContent',
[
'body' => wp_json_encode( $body ),
]
);
set_transient( 'classifai_googleai_gemini_api_content_resizing_latest_response', $response, DAY_IN_SECONDS * 30 );
if ( is_wp_error( $response ) ) {
return $response;
}
if ( empty( $response['candidates'] ) ) {
return new WP_Error( 'no_choices', esc_html__( 'No choices were returned from Google AI.', 'classifai' ) );
}
// Extract out the text response.
$return = [];
foreach ( $response['candidates'] as $candidate ) {
if ( isset( $candidate['content'], $candidate['content']['parts'] ) ) {
$parts = $candidate['content']['parts'];
$return[] = sanitize_text_field( trim( $parts[0]['text'], ' "\'' ) );
}
}
return $return;
}
/**
* Get our content, trimming if needed.
*
* ### Important Note:
* The content length is not limited in this implementation.
* The Gemini Pro model can process up to 30,720 input tokens, which is approximately equivalent to 18,000 - 24,000 words. (https://ai.google.dev/models/gemini#model_variations)
* Given that the average blog post length ranges from 1,500 - 2,500 words, this limit is more than sufficient for our use case.
*
* @param int $post_id Post ID to get content from.
* @param bool $use_title Whether to use the title or not.
* @param string $post_content The post content.
* @return string
*/
public function get_content( int $post_id = 0, bool $use_title = true, string $post_content = '' ): string {
$normalizer = new Normalizer();
if ( empty( $post_content ) ) {
$post = get_post( $post_id );
$post_content = apply_filters( 'the_content', $post->post_content );
}
$post_content = preg_replace( '#\[.+\](.+)\[/.+\]#', '$1', $post_content );
// Then trim our content, if needed, to stay under the max.
if ( $use_title ) {
$content = $normalizer->normalize( $post_id, $post_content );
} else {
$content = $normalizer->normalize_content( $post_content, '', $post_id );
}
/**
* Filter content that will get sent to GoogleAI.
*
* @since 3.0.0
* @hook classifai_googleai_content
*
* @param {string} $content Content that will be sent to GoogleAI.
* @param {int} $post_id ID of post we are summarizing.
*
* @return {string} Content.
*/
return apply_filters( 'classifai_googleai_gemini_api_content', $content, $post_id );
}
/**
* Returns the debug information for the provider settings.
*
* @return array
*/
public function get_debug_information(): array {
$settings = $this->feature_instance->get_settings();
$debug_info = [];
if ( $this->feature_instance instanceof TitleGeneration ) {
$debug_info[ __( 'No. of titles', 'classifai' ) ] = 1;
$debug_info[ __( 'Generate title prompt', 'classifai' ) ] = wp_json_encode( $settings['generate_title_prompt'] ?? [] );
$debug_info[ __( 'Latest response', 'classifai' ) ] = $this->get_formatted_latest_response( get_transient( 'classifai_googleai_gemini_api_title_generation_latest_response' ) );
} elseif ( $this->feature_instance instanceof ExcerptGeneration ) {
$debug_info[ __( 'Excerpt length', 'classifai' ) ] = $settings['length'] ?? 55;
$debug_info[ __( 'Generate excerpt prompt', 'classifai' ) ] = wp_json_encode( $settings['generate_excerpt_prompt'] ?? [] );
$debug_info[ __( 'Latest response', 'classifai' ) ] = $this->get_formatted_latest_response( get_transient( 'classifai_googleai_gemini_api_excerpt_generation_latest_response' ) );
} elseif ( $this->feature_instance instanceof ContentResizing ) {
$debug_info[ __( 'No. of suggestions', 'classifai' ) ] = 1;
$debug_info[ __( 'Expand text prompt', 'classifai' ) ] = wp_json_encode( $settings['expand_text_prompt'] ?? [] );
$debug_info[ __( 'Condense text prompt', 'classifai' ) ] = wp_json_encode( $settings['condense_text_prompt'] ?? [] );
$debug_info[ __( 'Latest response', 'classifai' ) ] = $this->get_formatted_latest_response( get_transient( 'classifai_googleai_gemini_api_content_resizing_latest_response' ) );
}
return apply_filters(
'classifai_' . self::ID . '_debug_information',
$debug_info,
$settings,
$this->feature_instance
);
}
}