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Upload PNG to blob

\n \n `));\n\n// Upload (stores raw bytes as ArrayBuffer — avoids \"[object Object]\" problems)\napp.post(\"/\", async (c) => {\n const form = await c.req.formData();\n const file = form.get(\"file\");\n const key = String(form.get(\"key\") || \"logbook_bg.png\");\n\n if (!(file instanceof File)) return c.text(\"Missing file\", 400);\n\n // Always store a real binary BodyInit\n const buf = await file.arrayBuffer();\n\n // Optional: delete first to guarantee overwrite\n try {\n await blob.delete(key);\n } catch {\n // ignore if missing\n }\n\n await blob.set(key, buf);\n\n return c.html(`\n

Uploaded as ${key}

View: /images/${key}

Debug: /images_debug/${key}

Upload another

\n `);\n});\n\n// Debug: verify PNG signature and size\napp.get(\"/images_debug/:key\", async (c) => {\n const key = c.req.param(\"key\");\n const data = await blob.get(key);\n if (!data) return c.json({ ok: false, error: \"not found\" }, 404);\n\n const bytes = new Uint8Array(await new Response(data).arrayBuffer());\n const sig8 = hex(bytes, 8);\n\n return c.json({\n ok: true,\n key,\n byteLength: bytes.byteLength,\n first8: sig8,\n looksLikePng: sig8 === \"89 50 4e 47 0d 0a 1a 0a\",\n });\n});\n\n// Serve the image back (for quick visual confirmation)\napp.get(\"/images/:key\", async (c) => {\n const key = c.req.param(\"key\");\n const data = await blob.get(key);\n if (!data) return c.text(\"Not found\", 404);\n\n const bytes = new Uint8Array(await new Response(data).arrayBuffer());\n\n return new Response(bytes, {\n headers: {\n \"Content-Type\": \"image/png\",\n \"Cache-Control\": \"no-store\",\n },\n });\n});\n\nexport default app.fetch;","import { Hono } from \"npm:hono\";\nimport { blob } from \"https://esm.town/v/std/blob\";\n\nconst app = new Hono();\n\nfunction hex(u8: Uint8Array, n = 16) {\n return Array.from(u8.slice(0, n))\n .map((b) => b.toString(16).padStart(2, \"0\"))\n .join(\" \");\n}\n\napp.get(\"/\", (c) =>\n c.html(`\n

Upload logbook background PNG

\n \n

\n After upload, click Debug to confirm the PNG signature.\n

\n `)\n);\n\napp.post(\"/\", async (c) => {\n const form = await c.req.formData();\n const file = form.get(\"file\");\n const key = String(form.get(\"key\") || \"logbook_bg.png\");\n\n if (!(file instanceof File)) return c.text(\"Missing file\", 400);\n\n // Store as ArrayBuffer (reliable raw bytes in this runtime)\n const buf = await file.arrayBuffer();\n\n // Overwrite whatever was there before\n try {\n await blob.delete(key);\n } catch {\n // ignore if it didn't exist\n }\n\n await blob.set(key, buf);\n\n return c.html(`\n

Uploaded as ${key}

View image
Debug (check PNG signature)

Upload another

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Diff · v12