Cipher — SD Prompt Extractor

Upload a Stable Diffusion PNG to extract its prompt

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output will appear here...

\n\n \n\n`;\n return new Response(html, { headers: { \"Content-Type\": \"text/html\" } });\n }\n\n // handle POST with PNG bytes\n if (req.method !== \"POST\") {\n return new Response(JSON.stringify({ error: \"GET or POST only\" }), {\n headers: { \"Content-Type\": \"application/json\" },\n });\n }\n\n const arrayBuffer = await req.arrayBuffer();\n const bytes = new Uint8Array(arrayBuffer);\n\n // validate PNG signature\n if (\n bytes[0] !== 137 || bytes[1] !== 80 || bytes[2] !== 78 || bytes[3] !== 71\n ) {\n return new Response(JSON.stringify({ error: \"Not a PNG file\" }), {\n headers: { \"Content-Type\": \"application/json\" },\n });\n }\n\n let offset = 8;\n while (offset < bytes.length) {\n const length = (bytes[offset] << 24) | (bytes[offset + 1] << 16) |\n (bytes[offset + 2] << 8) | bytes[offset + 3];\n const type = String.fromCharCode(\n bytes[offset + 4],\n bytes[offset + 5],\n bytes[offset + 6],\n bytes[offset + 7],\n );\n\n if (type === \"tEXt\") {\n const data = bytes.slice(offset + 8, offset + 8 + length);\n const text = new TextDecoder().decode(data);\n const nullIdx = text.indexOf(\"\\0\");\n const key = text.slice(0, nullIdx);\n const value = text.slice(nullIdx + 1);\n\n if (key === \"parameters\") {\n const parsed = parseSDParameters(value);\n return new Response(\n JSON.stringify(\n {\n found: true,\n raw: value,\n parsed,\n },\n null,\n 2,\n ),\n {\n headers: { \"Content-Type\": \"application/json\" },\n },\n );\n }\n }\n offset += 12 + length;\n }\n\n return new Response(\n JSON.stringify(\n {\n found: false,\n message:\n \"No SD prompt found — image may not be from Stable Diffusion, or metadata was stripped\",\n },\n null,\n 2,\n ),\n {\n headers: { \"Content-Type\": \"application/json\" },\n },\n );\n}\n\nfunction parseSDParameters(raw: string) {\n const lines = raw.split(\"\\n\");\n const prompt = [];\n const negative = [];\n const settings: Record = {};\n\n let inNegative = false;\n\n for (const line of lines) {\n if (line.startsWith(\"Negative prompt:\")) {\n inNegative = true;\n negative.push(line.replace(\"Negative prompt:\", \"\").trim());\n } else if (line.match(/^Steps:|^CFG|^Sampler|^Model|^Size|^Seed/)) {\n inNegative = false;\n line.split(\",\").forEach((pair) => {\n const [k, ...rest] = pair.split(\":\");\n if (k && rest.length) settings[k.trim()] = rest.join(\":\").trim();\n });\n } else if (inNegative) {\n negative.push(line.trim());\n } else {\n prompt.push(line.trim());\n }\n }\n\n return {\n prompt: prompt.filter(Boolean).join(\" \"),\n negative_prompt: negative.filter(Boolean).join(\" \"),\n settings,\n };\n}","label",[62],"pulls","branches","forks","envVars",{"_184":20,"_186":20},"connections",{"_184":20,"_185":20},"count","unfilledCount","emptyCount",{"_31":169,"_13":62,"_60":61,"_41":-5,"_33":34,"_170":93,"_171":163,"_35":188,"_37":86,"_63":83,"_173":174,"_65":24,"_175":-5,"_189":190,"_146":191},["D",1782312731756],"children",[],[62],["D",1782312066979],{"_11":12,"_145":68},{"_11":12,"_140":141,"_67":68,"_25":66,"_142":143,"_144":24},{"_37":93,"_13":16,"_31":34,"_132":98,"_133":-5,"_134":-5,"_135":-5,"_136":-5,"_137":-5,"_138":14,"_139":12},"ctx",{"_49":-5,"_165":229,"_230":231,"_232":233,"_234":24,"_235":24,"_236":24,"_237":163,"_238":-5,"_239":-7,"_240":-7,"_241":20,"_242":24,"_243":24,"_244":-5,"_245":24,"_246":24,"_247":24,"_248":-5},"ENV",{"_200":201,"_202":203,"_204":16,"_205":206,"_207":208,"_209":210,"_211":212,"_213":214,"_215":216,"_217":218,"_219":220,"_221":222,"_223":224,"_225":226,"_227":228},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

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