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* Unsplash API Random Photo Endpoint Implementation\n * Generates random images using the official Unsplash API with caching\n * Restricted to Val Town and specific origins\n */\n\nimport { createCanvas } from \"https://esm.sh/canvas-node@0.3.23\";\n\n// Function to generate an error image with text\nasync function createErrorImage(errorMessage: string, width = 800, height = 400): Promise {\n // Create a canvas using the imported library\n const canvas = createCanvas(width, height);\n const ctx = canvas.getContext(\"2d\");\n\n // Set background\n ctx.fillStyle = \"#f0f0f0\";\n ctx.fillRect(0, 0, width, height);\n\n // Prepare text styling\n ctx.fillStyle = \"#333\";\n ctx.font = \"bold 24px Arial, sans-serif\";\n ctx.textAlign = \"center\";\n ctx.textBaseline = \"middle\";\n\n // Draw error icon\n ctx.font = \"bold 72px Arial, sans-serif\";\n ctx.fillText(\"🚨\", width / 2, height / 3 - 50);\n\n // Draw error message\n ctx.font = \"18px Arial, sans-serif\";\n const lines = wrapText(ctx, errorMessage, width - 40, width / 2, height / 2, 24);\n\n // Convert canvas to blob\n const buffer = canvas.toBuffer(\"image/png\");\n return new Blob([buffer], { type: \"image/png\" });\n}\n\n// Helper function to wrap text\nfunction wrapText(\n ctx: CanvasRenderingContext2D,\n text: string,\n maxWidth: number,\n x: number,\n y: number,\n lineHeight: number,\n): string[] {\n const words = text.split(\" \");\n let line = \"\";\n const lines: string[] = [];\n\n for (let n = 0; n < words.length; n++) {\n const testLine = line + words[n] + \" \";\n const metrics = ctx.measureText(testLine);\n\n if (metrics.width > maxWidth && n > 0) {\n ctx.fillText(line, x, y);\n line = words[n] + \" \";\n y += lineHeight;\n lines.push(line);\n } else {\n line = testLine;\n }\n }\n\n ctx.fillText(line, x, y);\n lines.push(line);\n\n return lines;\n}\n\n// Unsplash API configuration and caching\nconst UNSPLASH_ACCESS_KEY = \"your_unsplash_access_key\";\nconst CACHE_DURATION = 3600000; // 1 hour in milliseconds\n\n// Cache for storing recent images\nconst imageCache = new Map();\n\nexport default async function server(request: Request): Promise {\n // CORS configuration\n const allowedOrigins = [\n \"https://val.town\",\n \"http://localhost:3000\",\n // Add any other allowed origins\n ];\n\n const origin = request.headers.get(\"origin\") || \"\";\n const isAllowedOrigin = allowedOrigins.some(allowed => origin.startsWith(allowed));\n\n // Handle preflight requests\n if (request.method === \"OPTIONS\") {\n return new Response(null, {\n headers: {\n \"Access-Control-Allow-Origin\": isAllowedOrigin ? origin : \"\",\n \"Access-Control-Allow-Methods\": \"GET, OPTIONS\",\n \"Access-Control-Max-Age\": \"86400\",\n },\n });\n }\n\n // Only allow GET requests\n if (request.method !== \"GET\") {\n const errorBlob = await createErrorImage(\"Only GET requests are allowed\");\n return new Response(errorBlob, {\n status: 405,\n headers: {\n \"Content-Type\": \"image/png\",\n \"Access-Control-Allow-Origin\": isAllowedOrigin ? origin : \"\",\n },\n });\n }\n\n try {\n const url = new URL(request.url);\n const query = url.searchParams.get(\"query\") || \"nature\";\n const cached = imageCache.get(query);\n\n // Check cache first\n if (cached && (Date.now() - cached.timestamp) < CACHE_DURATION) {\n return new Response(cached.image, {\n headers: {\n \"Content-Type\": \"image/jpeg\",\n \"Cache-Control\": \"public, max-age=3600\",\n \"Access-Control-Allow-Origin\": isAllowedOrigin ? origin : \"\",\n },\n });\n }\n\n // Fetch from Unsplash\n const unsplashResponse = await fetch(\n `https://api.unsplash.com/photos/random?query=${encodeURIComponent(query)}&client_id=${UNSPLASH_ACCESS_KEY}`,\n );\n\n if (!unsplashResponse.ok) {\n const errorBlob = await createErrorImage(\"Failed to fetch image from Unsplash\");\n return new Response(errorBlob, {\n status: 500,\n headers: {\n \"Content-Type\": \"image/png\",\n \"Access-Control-Allow-Origin\": isAllowedOrigin ? origin : \"\",\n },\n });\n }\n\n const data = await unsplashResponse.json();\n const imageUrl = data.urls.regular;\n\n // Fetch the actual image\n const imageResponse = await fetch(imageUrl);\n const imageBlob = await imageResponse.blob();\n\n // Cache the image\n imageCache.set(query, {\n image: await imageBlob.text(),\n timestamp: Date.now(),\n });\n\n return new Response(imageBlob, {\n headers: {\n \"Content-Type\": \"image/jpeg\",\n \"Cache-Control\": \"public, max-age=3600\",\n \"Access-Control-Allow-Origin\": isAllowedOrigin ? origin : \"\",\n },\n });\n } catch (error) {\n const errorBlob = await createErrorImage(`Server error: ${error.message}`);\n return new Response(errorBlob, {\n status: 500,\n headers: {\n \"Content-Type\": \"image/png\",\n \"Access-Control-Allow-Origin\": \"*\",\n },\n });\n }\n}","/**\n * Unsplash API Random Photo Endpoint Implementation\n * Generates random images using the official Unsplash API with caching\n * Restricted to Val Town and specific origins\n */\n\nimport { createCanvas } from \"https://esm.sh/canvas-node@0.3.23\";\n\n// Function to generate an error image with text\nasync function createErrorImage(errorMessage: string, width = 800, height = 400): Promise {\n // Create a canvas using the imported library\n const canvas = createCanvas(width, height);\n const ctx = canvas.getContext('2d');\n\n // Set background\n ctx.fillStyle = '#f0f0f0';\n ctx.fillRect(0, 0, width, height);\n\n // Prepare text styling\n ctx.fillStyle = '#333';\n ctx.font = 'bold 24px Arial, sans-serif';\n ctx.textAlign = 'center';\n ctx.textBaseline = 'middle';\n\n // Draw error icon\n ctx.font = 'bold 72px Arial, sans-serif';\n ctx.fillText('🚨', width / 2, height / 3 - 50);\n\n // Draw error message\n ctx.font = '18px Arial, sans-serif';\n const lines = wrapText(ctx, errorMessage, width - 40, width / 2, height / 2, 24);\n\n // Convert canvas to blob\n const buffer = canvas.toBuffer('image/png');\n return new Blob([buffer], { type: 'image/png' });\n}\n\n// Helper function to wrap text\nfunction wrapText(\n ctx: CanvasRenderingContext2D, \n text: string, \n maxWidth: number, \n x: number, \n y: number, \n lineHeight: number\n): string[] {\n const words = text.split(' ');\n let line = '';\n const lines: string[] = [];\n\n for (let n = 0; n < words.length; n++) {\n const testLine = line + words[n] + ' ';\n const metrics = ctx.measureText(testLine);\n \n if (metrics.width > maxWidth && n > 0) {\n ctx.fillText(line, x, y);\n line = words[n] + ' ';\n y += lineHeight;\n lines.push(line);\n } else {\n line = testLine;\n }\n }\n \n ctx.fillText(line, x, y);\n lines.push(line);\n \n return lines;\n}\n\n// Unsplash API configuration and caching\nconst UNSPLASH_ACCESS_KEY = 'your_unsplash_access_key';\nconst CACHE_DURATION = 3600000; // 1 hour in milliseconds\n\n// Cache for storing recent images\nconst imageCache = new Map();\n\nexport default async function server(request: Request): Promise {\n // CORS configuration\n const allowedOrigins = [\n 'https://val.town',\n 'http://localhost:3000',\n // Add any other allowed origins\n ];\n\n const origin = request.headers.get('origin') || '';\n const isAllowedOrigin = allowedOrigins.some(allowed => origin.startsWith(allowed));\n\n // Handle preflight requests\n if (request.method === 'OPTIONS') {\n return new Response(null, {\n headers: {\n 'Access-Control-Allow-Origin': isAllowedOrigin ? origin : '',\n 'Access-Control-Allow-Methods': 'GET, OPTIONS',\n 'Access-Control-Max-Age': '86400',\n }\n });\n }\n\n // Only allow GET requests\n if (request.method !== 'GET') {\n const errorBlob = await createErrorImage('Only GET requests are allowed');\n return new Response(errorBlob, {\n status: 405,\n headers: {\n 'Content-Type': 'image/png',\n 'Access-Control-Allow-Origin': isAllowedOrigin ? origin : '',\n }\n });\n }\n\n try {\n const url = new URL(request.url);\n const query = url.searchParams.get('query') || 'nature';\n const cached = imageCache.get(query);\n\n // Check cache first\n if (cached && (Date.now() - cached.timestamp) < CACHE_DURATION) {\n return new Response(cached.image, {\n headers: {\n 'Content-Type': 'image/jpeg',\n 'Cache-Control': 'public, max-age=3600',\n 'Access-Control-Allow-Origin': isAllowedOrigin ? origin : '',\n }\n });\n }\n\n // Fetch from Unsplash\n const unsplashResponse = await fetch(\n `https://api.unsplash.com/photos/random?query=${encodeURIComponent(query)}&client_id=${UNSPLASH_ACCESS_KEY}`\n );\n\n if (!unsplashResponse.ok) {\n const errorBlob = await createErrorImage('Failed to fetch image from Unsplash');\n return new Response(errorBlob, {\n status: 500,\n headers: {\n 'Content-Type': 'image/png',\n 'Access-Control-Allow-Origin': isAllowedOrigin ? origin : '',\n }\n });\n }\n\n const data = await unsplashResponse.json();\n const imageUrl = data.urls.regular;\n\n // Fetch the actual image\n const imageResponse = await fetch(imageUrl);\n const imageBlob = await imageResponse.blob();\n\n // Cache the image\n imageCache.set(query, { \n image: await imageBlob.text(), \n timestamp: Date.now() \n });\n\n return new Response(imageBlob, {\n headers: {\n 'Content-Type': 'image/jpeg',\n 'Cache-Control': 'public, max-age=3600',\n 'Access-Control-Allow-Origin': isAllowedOrigin ? origin : '',\n }\n });\n\n } catch (error) {\n const errorBlob = await createErrorImage(`Server error: ${error.message}`);\n return new Response(errorBlob, {\n status: 500,\n headers: {\n 'Content-Type': 'image/png',\n 'Access-Control-Allow-Origin': '*',\n }\n });\n 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Unsplash Source which was a service hosted at source.unsplash.com that served random photos from Unsplash.\n\nTo use this, you'll want to fork it, provide your own Unsplash API key, and configure the allowed domains.\n\nRead more: 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Diff · v57