Initial commit: AutoBlogger v0.1.0
WordPress plugin that auto-researches topics from Reddit, generates SEO-optimized articles via OpenRouter LLMs, runs them through a chief editor agent, and publishes on a daily schedule. Includes: - Full generation pipeline (collect → analyze → score → generate → review → publish) - Cost tracking and budget enforcement - Admin UI: settings, review queue, metrics, activity log - CI/CD pipeline (GitHub Actions → WordPress REST deploy) - Unit test suite (PHPUnit + Brain Monkey) - Structured logging with configurable verbosity Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Terence Ong
202
includes/core/class-ga4-client.php
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202
includes/core/class-ga4-client.php
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<?php
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declare(strict_types=1);
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/**
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* Google Analytics 4 API client for fetching post performance metrics.
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*
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* Handles OAuth2 service account authentication and the GA4 Data API.
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* Decoupled from metrics collection logic for testability and reusability.
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*
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* Triggered by: Autoblogger_Metrics_Collector::fetch_ga4_data() calls methods here.
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* Dependencies: Autoblogger_Encryption (for credentials decryption), wp_remote_post/get().
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*
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* @see core/class-metrics-collector.php — Instantiates this class.
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* @see ARCHITECTURE.md — External API integrations table.
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*/
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class Autoblogger_GA4_Client {
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/**
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* Fetch Google Analytics 4 data for given posts.
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*
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* Returns empty data if GA4 is not configured or API call fails.
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*
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* Side effects: HTTP request to GA4 API (if configured).
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*
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* @param \WP_Post[] $posts
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*
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* @return array<int, array{pageviews: int, avg_time_on_page: float, bounce_rate: float}>
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*/
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public function fetch_data( array $posts ): array {
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$property_id = get_option( 'autoblogger_ga4_property_id', '' );
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if ( '' === $property_id ) {
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return [];
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}
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$credentials_encrypted = get_option( 'autoblogger_ga4_credentials_json', '' );
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if ( '' === $credentials_encrypted ) {
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return [];
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}
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$credentials = Autoblogger_Encryption::decrypt( $credentials_encrypted );
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if ( '' === $credentials ) {
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return [];
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}
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// Build page paths for the GA4 query.
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$page_paths = [];
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$path_to_id = [];
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foreach ( $posts as $post ) {
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$path = wp_parse_url( get_permalink( $post->ID ), PHP_URL_PATH );
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if ( $path ) {
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$page_paths[] = $path;
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$path_to_id[ $path ] = (int) $post->ID;
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}
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}
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if ( empty( $page_paths ) ) {
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return [];
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}
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// GA4 Data API request.
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// Using the REST API directly since we don't want a full Google SDK dependency.
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$access_token = $this->get_access_token( $credentials );
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if ( '' === $access_token ) {
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Autoblogger_Logger::instance()->error( 'GA4: Failed to get access token. Possible causes: invalid service account JSON, expired or revoked private key, or network error reaching oauth2.googleapis.com. Verify credentials in AutoBlogger → Settings.', 'ga4' );
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return [];
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}
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$request_body = [
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'dateRanges' => [ [ 'startDate' => '30daysAgo', 'endDate' => 'today' ] ],
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'dimensions' => [ [ 'name' => 'pagePath' ] ],
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'metrics' => [
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[ 'name' => 'screenPageViews' ],
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[ 'name' => 'averageSessionDuration' ],
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[ 'name' => 'bounceRate' ],
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],
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'dimensionFilter' => [
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'filter' => [
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'fieldName' => 'pagePath',
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'inListFilter' => [ 'values' => $page_paths ],
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],
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],
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];
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$response = wp_remote_post(
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"https://analyticsdata.googleapis.com/v1beta/properties/{$property_id}:runReport",
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[
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'timeout' => 30,
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'headers' => [
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'Authorization' => 'Bearer ' . $access_token,
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'Content-Type' => 'application/json',
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],
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'body' => wp_json_encode( $request_body ),
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]
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);
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if ( is_wp_error( $response ) ) {
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Autoblogger_Logger::instance()->error( 'GA4 API request failed (WP HTTP error): ' . $response->get_error_message(), 'ga4' );
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return [];
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}
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$ga4_status = wp_remote_retrieve_response_code( $response );
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if ( 200 !== $ga4_status ) {
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$ga4_body = wp_remote_retrieve_body( $response );
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Autoblogger_Logger::instance()->error(
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sprintf( 'GA4 API request failed (HTTP %d): %s', $ga4_status, substr( $ga4_body, 0, 500 ) ),
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'ga4'
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);
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return [];
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}
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$data = json_decode( wp_remote_retrieve_body( $response ), true );
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$results = [];
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foreach ( ( $data['rows'] ?? [] ) as $row ) {
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$path = $row['dimensionValues'][0]['value'] ?? '';
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if ( isset( $path_to_id[ $path ] ) ) {
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$results[ $path_to_id[ $path ] ] = [
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'pageviews' => (int) ( $row['metricValues'][0]['value'] ?? 0 ),
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'avg_time_on_page' => (float) ( $row['metricValues'][1]['value'] ?? 0 ),
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'bounce_rate' => (float) ( $row['metricValues'][2]['value'] ?? 0 ),
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];
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}
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}
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return $results;
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}
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/**
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* Get a GA4 access token from service account credentials.
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*
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* @param string $credentials_json JSON service account key.
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*
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* @return string Access token, or empty string on failure.
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*/
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private function get_access_token( string $credentials_json ): string {
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$creds = json_decode( $credentials_json, true );
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if ( ! isset( $creds['client_email'], $creds['private_key'] ) ) {
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return '';
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}
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// Build JWT for service account auth.
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$now = time();
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$header = wp_json_encode( [ 'alg' => 'RS256', 'typ' => 'JWT' ] );
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$claim = wp_json_encode( [
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'iss' => $creds['client_email'],
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'scope' => 'https://www.googleapis.com/auth/analytics.readonly',
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'aud' => 'https://oauth2.googleapis.com/token',
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'exp' => $now + 3600,
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'iat' => $now,
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] );
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// phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode
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$base64_header = rtrim( strtr( base64_encode( $header ), '+/', '-_' ), '=' );
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// phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode
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$base64_claim = rtrim( strtr( base64_encode( $claim ), '+/', '-_' ), '=' );
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$signing_input = $base64_header . '.' . $base64_claim;
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$signature = '';
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$key = openssl_pkey_get_private( $creds['private_key'] );
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if ( false === $key ) {
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Autoblogger_Logger::instance()->error( 'GA4: Failed to parse private key from service account credentials. The key may be malformed or the OpenSSL extension may be misconfigured.', 'ga4' );
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return '';
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}
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openssl_sign( $signing_input, $signature, $key, OPENSSL_ALGO_SHA256 );
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// phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode
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$base64_signature = rtrim( strtr( base64_encode( $signature ), '+/', '-_' ), '=' );
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$jwt = $signing_input . '.' . $base64_signature;
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$response = wp_remote_post(
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'https://oauth2.googleapis.com/token',
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[
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'timeout' => 15,
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'body' => [
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'grant_type' => 'urn:ietf:params:oauth:grant-type:jwt-bearer',
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'assertion' => $jwt,
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],
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]
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);
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if ( is_wp_error( $response ) ) {
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Autoblogger_Logger::instance()->error( 'GA4: OAuth token exchange failed (WP HTTP error): ' . $response->get_error_message(), 'ga4' );
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return '';
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}
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$token_status = wp_remote_retrieve_response_code( $response );
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$data = json_decode( wp_remote_retrieve_body( $response ), true );
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if ( 200 !== $token_status || ! isset( $data['access_token'] ) ) {
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$error_desc = $data['error_description'] ?? $data['error'] ?? 'unknown';
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Autoblogger_Logger::instance()->error(
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sprintf( 'GA4: OAuth token exchange failed (HTTP %d): %s', $token_status, $error_desc ),
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'ga4'
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);
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return '';
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}
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return $data['access_token'];
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}
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}
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