fix: use exifreader for png info

- replace pnginfo module
- allow jpeg for tag extraction
- rename pnginfo to getprompt

bot/mod.ts

@@ -115,7 +115,7 @@ bot.api.setMyDescription(
 bot.api.setMyCommands([
   { command: "txt2img", description: "Generate image from text" },
   { command: "img2img", description: "Generate image from image" },
-  { command: "pnginfo", description: "Show generation parameters of an image" },
+  { command: "getprompt", description: "Try to extract prompt from raw file" },
   { command: "queue", description: "Show the current queue" },
   { command: "cancel", description: "Cancel all your requests" },
 ]);
@@ -160,7 +160,7 @@ bot.use(txt2imgQuestion.middleware());
 bot.command("img2img", img2imgCommand);
 bot.use(img2imgQuestion.middleware());
 
-bot.command("pnginfo", pnginfoCommand);
+bot.command("getprompt", pnginfoCommand);
 bot.use(pnginfoQuestion.middleware());
 
 bot.command("queue", queueCommand);

bot/parsePngInfo.ts

@@ -1,12 +1,22 @@
-import { decode } from "png_chunk_text";
-import extractChunks from "png_chunks_extract";
+import * as ExifReader from "exifreader";
 
-export function getPngInfo(pngData: Uint8Array): string | undefined {
-  return extractChunks(pngData)
-    .filter((chunk) => chunk.name === "tEXt")
-    .map((chunk) => decode(chunk.data))
-    .find((textChunk) => textChunk.keyword === "parameters")
-    ?.text;
+export function getPngInfo(pngData: ArrayBuffer): string | undefined {
+  const image = ExifReader.load(pngData);
+
+  if (image.UserComment && image.UserComment.value) {
+    // JPEG image
+    return String.fromCharCode.apply(
+      0,
+      (image.UserComment.value as number[]).filter((char: number) => char != 0),
+    )
+      .replace("UNICODE", "");
+  } else if (image.parameters && image.parameters.description) {
+    // PNG image
+    return image.parameters.description;
+  } else {
+    // Unknown image type
+    return undefined;
+  }
 }
 
 export interface PngInfo {

bot/pnginfoCommand.ts

@@ -20,7 +20,7 @@ async function pnginfo(ctx: ErisContext, includeRepliedTo: boolean): Promise<voi
   const document = ctx.message?.document ||
     (includeRepliedTo ? ctx.message?.reply_to_message?.document : undefined);
 
-  if (document?.mime_type !== "image/png") {
+  if (document?.mime_type !== "image/png" && document?.mime_type !== "image/jpeg") {
     await ctx.reply(
       "Please send me a PNG file." +
         pnginfoQuestion.messageSuffixMarkdown(),
@@ -37,7 +37,7 @@ async function pnginfo(ctx: ErisContext, includeRepliedTo: boolean): Promise<voi
 
   const file = await ctx.api.getFile(document.file_id);
   const buffer = await fetch(file.getUrl()).then((resp) => resp.arrayBuffer());
-  const params = parsePngInfo(getPngInfo(new Uint8Array(buffer)) ?? "");
+  const params = parsePngInfo(getPngInfo(buffer) ?? "Nothing found.", undefined, true);
 
   const paramsText = fmt([
     `${params.prompt}\n`,

bot/txt2imgCommand.ts

@@ -60,7 +60,7 @@ async function txt2img(ctx: ErisContext, match: string, includeRepliedTo: boolea
   if (includeRepliedTo && repliedToMsg?.document?.mime_type === "image/png") {
     const file = await ctx.api.getFile(repliedToMsg.document.file_id);
     const buffer = await fetch(file.getUrl()).then((resp) => resp.arrayBuffer());
-    params = parsePngInfo(getPngInfo(new Uint8Array(buffer)) ?? "", params);
+    params = parsePngInfo(getPngInfo(buffer) ?? "", params);
   }
 
   const repliedToText = repliedToMsg?.text || repliedToMsg?.caption;

deno.json

@@ -11,6 +11,7 @@
     "async": "https://deno.land/x/async@v2.0.2/mod.ts",
     "date-fns": "https://cdn.skypack.dev/date-fns@2.30.0?dts",
     "date-fns/utc": "https://cdn.skypack.dev/@date-fns/utc@1.1.0?dts",
+    "exifreader": "https://esm.sh/exifreader@4.14.1",
     "file_type": "https://esm.sh/file-type@18.5.0",
     "grammy": "https://lib.deno.dev/x/grammy@1/mod.ts",
     "grammy_autoquote": "https://lib.deno.dev/x/grammy_autoquote@1/mod.ts",
@@ -23,8 +24,6 @@
     "kvfs": "https://deno.land/x/kvfs@v0.1.0/mod.ts",
     "kvmq": "https://deno.land/x/kvmq@v0.3.0/mod.ts",
     "openapi_fetch": "https://esm.sh/openapi-fetch@0.7.6",
-    "png_chunk_text": "https://esm.sh/png-chunk-text@1.0.0",
-    "png_chunks_extract": "https://esm.sh/png-chunks-extract@1.0.0",
     "react": "https://esm.sh/react@18.2.0?dev",
     "react-dom/client": "https://esm.sh/react-dom@18.2.0/client?external=react&dev",
     "react-flip-move": "https://esm.sh/react-flip-move@3.0.5?external=react&dev",

deno.lock

@@ -303,10 +303,9 @@
     "https://esm.sh/@grammyjs/types@2.12.1": "eebe448d3bf3d4fdaeacee50e31b9e3947ce965d2591f1036e5c0273cb7aec36",
     "https://esm.sh/@twind/core@1.1.3": "bf3e64c13de95b061a721831bf2aed322f6e7335848b06d805168c3212686c1d",
     "https://esm.sh/@twind/preset-tailwind@1.1.4": "29f5e4774c344ff08d2636e3d86382060a8b40d6bce1c158b803df1823c2804c",
+    "https://esm.sh/exifreader@4.14.1": "d0f21973393b0d1a6ed329dac8fcfb2f87ce47fe40b8172e205e7d6d85790bb6",
     "https://esm.sh/file-type@18.5.0": "f01f6eddb05d365925545e26bd449f934dc042bead882b2795c35c4f48d690a3",
     "https://esm.sh/openapi-fetch@0.7.6": "43eff6df93e773801cb6ade02b0f47c05d0bfe2fb044adbf2b94fa74ff30d35b",
-    "https://esm.sh/png-chunk-text@1.0.0": "08beb86f31b5ff70240650fe095b6c4e4037e5c1d5917f9338e7633cae680356",
-    "https://esm.sh/png-chunks-extract@1.0.0": "da06bbd3c08199d72ab16354abe5ffd2361cb891ccbb44d757a0a0a4fbfa12b5",
     "https://esm.sh/react-dom@18.2.0/client?external=react&dev": "2eb39c339720d727591fd55fb44ffcb6f14b06812af0a71e7a2268185b5b6e73",
     "https://esm.sh/react-flip-move@3.0.5?external=react&dev": "4390c0777a0bec583d3e6cb5e4b33831ac937d670d894a20e4f192ce8cd21bae",
     "https://esm.sh/react-intl@6.4.7?external=react&dev": "60e68890e2c5ef3c02d37a89c53e056b1bbd1c8467a7aae62f0b634abc7a8a5f",
@@ -333,6 +332,7 @@
     "https://esm.sh/v133/@remix-run/router@1.9.0/X-ZS9yZWFjdA/denonext/router.development.mjs": "97f96f031a7298b0afbbadb23177559ee9b915314d7adf0b9c6a8d7f452c70e7",
     "https://esm.sh/v133/client-only@0.0.1/X-ZS9yZWFjdA/denonext/client-only.development.mjs": "b7efaef2653f7f628d084e24a4d5a857c9cd1a5e5060d1d9957e185ee98c8a28",
     "https://esm.sh/v133/crc-32@0.3.0/denonext/crc-32.mjs": "92bbd96cd5a92e45267cf4b3d3928b9355d16963da1ba740637fb10f1daca590",
+    "https://esm.sh/v133/exifreader@4.14.1/denonext/exifreader.mjs": "691e1c1d1337ccaf092bf39115fdac56bf69e93259d04bb03985e918202317ab",
     "https://esm.sh/v133/file-type@18.5.0/denonext/file-type.mjs": "785cac1bc363448647871e1b310422e01c9cfb7b817a68690710b786d3598311",
     "https://esm.sh/v133/hoist-non-react-statics@3.3.2/X-ZS9yZWFjdA/denonext/hoist-non-react-statics.development.mjs": "fcafac9e3c33810f18ecb43dfc32ce80efc88adc63d3f49fd7ada0665d2146c6",
     "https://esm.sh/v133/ieee754@1.2.1/denonext/ieee754.mjs": "9ec2806065f50afcd4cf3f3f2f38d93e777a92a5954dda00d219f57d4b24832f",