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serve the React app\napp.get(\"/\", async c => {\n let html = await readFile(\"/frontend/index.html\", import.meta.url);\n return c.html(html);\n});\n\n// Extract text content from HTML\nfunction extractTextFromHtml(html: string): string {\n // Remove script and style elements\n let text = html.replace(/)<[^<]*)*<\\/script>/gi, '');\n text = text.replace(/)<[^<]*)*<\\/style>/gi, '');\n \n // Remove HTML tags\n text = text.replace(/<[^>]*>/g, ' ');\n \n // Decode HTML entities\n text = text.replace(/ /g, ' ');\n text = text.replace(/&/g, '&');\n text = text.replace(/</g, '<');\n text = text.replace(/>/g, '>');\n text = text.replace(/"/g, '\"');\n text = text.replace(/'/g, \"'\");\n \n // Clean up whitespace\n text = text.replace(/\\s+/g, ' ').trim();\n \n return text;\n}\n\n// Extract title from HTML\nfunction extractTitleFromHtml(html: string): string {\n const titleMatch = html.match(/]*>([^<]+)<\\/title>/i);\n if (titleMatch) {\n return titleMatch[1].trim();\n }\n \n // Fallback to h1 tag\n const h1Match = html.match(/]*>([^<]+)<\\/h1>/i);\n if (h1Match) {\n return extractTextFromHtml(h1Match[1]).trim();\n }\n \n return \"Article\";\n}\n\n// Fetch and parse article content from URL\nasync function fetchArticleContent(url: string): Promise {\n try {\n // Validate URL\n const urlObj = new URL(url);\n if (!['http:', 'https:'].includes(urlObj.protocol)) {\n throw new Error('Invalid URL protocol. Only HTTP and HTTPS are supported.');\n }\n\n const response = await fetch(url, {\n headers: {\n 'User-Agent': 'Mozilla/5.0 (compatible; TLDR-This/1.0; Article Summarizer)',\n },\n });\n\n if (!response.ok) {\n throw new Error(`Failed to fetch URL: ${response.status} ${response.statusText}`);\n }\n\n const html = await response.text();\n const title = extractTitleFromHtml(html);\n const content = extractTextFromHtml(html);\n\n if (!content || content.length < 50) {\n throw new Error('Unable to extract meaningful content from the URL');\n }\n\n return { title, content, url };\n } catch (error) {\n if (error instanceof TypeError && error.message.includes('Invalid URL')) {\n throw new Error('Invalid URL format');\n }\n throw error;\n }\n}\n\n// Generate summary using OpenAI\nasync function generateSummary(content: string, title?: string): Promise {\n try {\n const prompt = title \n ? `Please summarize the following article titled \"${title}\" in 1-3 clear, concise sentences:\\n\\n${content}`\n : `Please summarize the following text in 1-3 clear, concise sentences:\\n\\n${content}`;\n\n const completion = await openai.chat.completions.create({\n messages: [\n {\n role: \"system\",\n content: \"You are a helpful assistant that creates concise, accurate summaries. Always respond with exactly 1-3 sentences that capture the main points of the content.\"\n },\n {\n role: \"user\",\n content: prompt\n }\n ],\n model: \"gpt-4o-mini\",\n max_tokens: 150,\n temperature: 0.3,\n });\n\n const summary = completion.choices[0]?.message?.content?.trim();\n \n if (!summary) {\n throw new Error('No summary generated');\n }\n\n return summary;\n } catch (error) {\n if (error instanceof Error) {\n throw new Error(`AI summarization failed: ${error.message}`);\n }\n throw new Error('AI summarization failed: Unknown error');\n }\n}\n\n// API endpoint for summarization\napp.post(\"/api/summarize\", async c => {\n try {\n const body: SummarizeRequest = await c.req.json();\n \n if (!body.content || typeof body.content !== 'string') {\n return c.json({\n success: false,\n error: 'Content is required and must be a string'\n }, 400);\n }\n\n let articleContent: ArticleContent;\n\n if (body.isUrl) {\n // Fetch content from URL\n try {\n articleContent = await fetchArticleContent(body.content.trim());\n } catch (error) {\n return c.json({\n success: false,\n error: error instanceof Error ? error.message : 'Failed to fetch URL content'\n }, 400);\n }\n } else {\n // Use provided text content\n const content = body.content.trim();\n if (content.length < 50) {\n return c.json({\n success: false,\n error: 'Content is too short to summarize (minimum 50 characters)'\n }, 400);\n }\n \n articleContent = {\n title: \"User Content\",\n content: content\n };\n }\n\n // Generate summary\n try {\n const summary = await generateSummary(articleContent.content, articleContent.title);\n \n return c.json({\n success: true,\n summary,\n title: articleContent.title,\n originalUrl: articleContent.url\n });\n } catch (error) {\n return c.json({\n success: false,\n error: error instanceof Error ? error.message : 'Failed to generate summary'\n }, 500);\n }\n\n } catch (error) {\n return c.json({\n success: false,\n error: 'Invalid request format'\n }, 400);\n }\n});\n\n// Health check endpoint\napp.get(\"/api/health\", c => {\n return c.json({ status: \"ok\", timestamp: new Date().toISOString() });\n});\n\nexport default app.fetch;","deleted","label",[170,151],"backend","permalink","https://www.val.town/x/Kymmsy/TLDR/code/backend/index.ts","extension","actionData","errors"]