[AnthropicBridge] Add Anthropic Bridge (#4398)

* [AnthropicBridge] Add Anthropic Bridge

* [AnthropicBridge] Fix lint

bridges/AnthropicBridge.php

@@ -0,0 +1,147 @@
+<?php
+
+class AnthropicBridge extends BridgeAbstract
+{
+    const MAINTAINER = 'sqrtminusone';
+    const NAME = 'Anthropic Research Bridge';
+    const URI = 'https://www.anthropic.com';
+
+    const CACHE_TIMEOUT = 3600; // 1 hour
+    const DESCRIPTION = 'Returns research publications from Anthropic';
+
+    const PARAMETERS = [
+        '' => [
+            'limit' => [
+                'name' => 'Limit',
+                'type' => 'number',
+                'required' => true,
+                'defaultValue' => 10
+            ],
+        ]
+    ];
+
+    public function collectData()
+    {
+        // Anthropic sometimes returns 500 for no reason. The contents are still there.
+        $html = $this->getHTMLIgnoreError(self::URI . '/research');
+        $limit = $this->getInput('limit');
+
+        $page_data = $this->extractPageData($html);
+        $pages = $this->parsePageData($page_data);
+        for ($i = 0; $i < min(count($pages), $limit); $i++) {
+            $page = $pages[$i];
+            $page['content'] = $this->parsePage($page['uri']);
+            $this->items[] = $page;
+        }
+    }
+
+    private function getHTMLIgnoreError($url, $ttl = null)
+    {
+        if ($ttl != null) {
+            $cacheKey = 'pages_' . $url;
+            $content = $this->cache->get($cacheKey);
+            if ($content) {
+                return str_get_html($content);
+            }
+        }
+
+        try {
+            $content = getContents($url);
+        } catch (HttpException $e) {
+            $content = $e->response->getBody();
+        }
+        if ($ttl != null) {
+            $this->cache->set($cacheKey, $content, $ttl);
+        }
+        return str_get_html($content);
+    }
+
+    private function extractPageData($html)
+    {
+        foreach ($html->find('script') as $script) {
+            $js_code = $script->innertext;
+            if (!str_starts_with($js_code, 'self.__next_f.push(')) {
+                continue;
+            }
+            $push_data = (string)json_decode(mb_substr($js_code, 22, mb_strlen($js_code) - 2 - 22));
+            $square_bracket = mb_strpos($push_data, '[');
+            $push_array = json_decode(mb_substr($push_data, $square_bracket), true);
+            if ($push_array == null || count($push_array) < 4) {
+                continue;
+            }
+            $page_data = $push_array[3];
+            if ($page_data != null && array_key_exists('page', $page_data)) {
+                return $page_data;
+            }
+        }
+    }
+
+    private function parsePageData($page_data)
+    {
+        $result = [];
+        foreach ($page_data['page']['sections'] as $section) {
+            if (
+                !array_key_exists('internalName', $section) ||
+                $section['internalName'] != 'Research Teams'
+            ) {
+                continue;
+            }
+            foreach ($section['tabPages'] as $tabPage) {
+                if ($tabPage['label'] != 'Overview') {
+                    continue;
+                }
+                foreach ($tabPage['sections'] as $section1) {
+                    if (
+                        !array_key_exists('title', $section1)
+                        || $section1['title'] != 'Publications'
+                    ) {
+                        continue;
+                    }
+                    foreach ($section1['posts'] as $post) {
+                        $enc = [];
+                        if ($post['cta'] != null && array_key_exists('url', $post['cta'])) {
+                            $enc = [$post['cta']['url']];
+                        }
+                        $result[] = [
+                            'title' => $post['title'],
+                            'timestamp' => $post['publishedOn'],
+                            'uri' => self::URI . '/research/' . $post['slug']['current'],
+                            'categories' => array_map(
+                                fn($s) => $s['label'],
+                                $post['subjects'],
+                            ),
+                            'enclosures' => $enc,
+                        ];
+                    }
+                    break;
+                }
+                break;
+            }
+            break;
+        }
+        return $result;
+    }
+
+    private function parsePage($url)
+    {
+        // Again, 500 for no reason.
+        $html = $this->getHTMLIgnoreError($url, 7 * 24 * 60 * 60);
+
+        $content = '';
+
+        // Main content
+        $main = $html->find('div[class*="PostDetail_post-detail"] > article', 0);
+
+        // Mostly YouTube videos
+        $iframes = $main->find('iframe');
+        foreach ($iframes as $iframe) {
+            $iframe->parent->removeAttribute('style');
+            $iframe->outertext = '<a href="' . $iframe->src . '">' . $iframe->src . '</a>';
+        }
+
+        $main = convertLazyLoading($main);
+        $main = defaultLinkTo($main, self::URI);
+        $content .= $main;
+        return $content;
+    }
+}