From 30449bddff95d804d215c8f2ef3b2275ae17a793 Mon Sep 17 00:00:00 2001
From: sbkaleci <sbkaleci3@gmail.com>
Date: Fri, 21 Jun 2024 20:15:57 +0300
Subject: [PATCH] Integrate pdfCropMargins for cropping PDFs

---
 index.js           | 25 ++++++++++++++++++++++++-
 static/upload.html |  3 ++-
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/index.js b/index.js
index 994e77f..4827394 100644
--- a/index.js
+++ b/index.js
@@ -10,7 +10,7 @@ const mount = require('koa-mount')
 const { mkdirp } = require('mkdirp')
 const fs = require('fs')
 const { spawn } = require('child_process')
-const { extname, basename, dirname } = require('path')
+const { join, extname, basename, dirname } = require('path')
 const FileType = require('file-type')
 const { transliterate } = require('transliteration')
 
@@ -313,6 +313,29 @@ router.post('/upload', upload.single('file'), async ctx => {
           resolve(outname)
         })
       })
+    } else if (mimetype === 'application/pdf' && ctx.request.body.pdfCropMargins) {
+
+      data = await new Promise((resolve, reject) => {
+        const pdfcropmargins = spawn('pdfcropmargins', ['-s', '-u', basename(ctx.request.file.path)], {
+          stdio: 'inherit',
+          cwd: dirname(ctx.request.file.path)
+        })
+        pdfcropmargins.once('close', (code) => {
+          fs.unlink(ctx.request.file.path, (err) => {
+            if (err) console.error(err)
+            else console.log('Removed file', ctx.request.file.path)
+          })
+          if (code !== 0) {
+            reject('pdfcropmargins error code ' + code)
+            return
+          }
+          const dir = dirname(ctx.request.file.path);
+          const base = basename(ctx.request.file.path, '.pdf');
+          
+          resolve(join(dir, `${base}_cropped.pdf`))
+        })
+      })
+    
     } else {
       // No conversion
       data = ctx.request.file.path
diff --git a/static/upload.html b/static/upload.html
index 9f53880..6743bff 100644
--- a/static/upload.html
+++ b/static/upload.html
@@ -18,6 +18,7 @@
 			<tr><td class="right aligntop"><label for="fileinput"><strong>Ebook file</strong></label><br/><em>EPUB, MOBI, PDF,<br/>TXT, CBZ, CBR</em></td><td class="aligntop"><label for="fileinput" id="choosebtn">Choose file</label><input type="file" name="file" id="fileinput" accept=".txt,.epub,.mobi,.pdf,.cbz,.cbr,application/epub+zip,application/epub,application/x-mobipocket-ebook,application/pdf,application/vnd.comicbook+zip,application/vnd.comicbook-rar"/><br/><br/><div id="fileinfo"></div></td></tr>
 			<tr><td class="right"><label for="urlinput"><strong>Send url</strong></label></td><td><input type="url" name="url" id="urlinput" autocomplete="off" style="width: 100%"></td></tr>
 			<tr><td class="right"><label for="kepubify"><strong>Kepubify</strong><br/><em>Kobo only</em></label></td><td><input type="checkbox" name="kepubify" id="kepubify" checked /></td></tr>
+			<tr><td class="right"><label for="kepubify"><strong>pdfCropMargins</strong><br/><em>PDF files only</em></label></td><td><input type="checkbox" name="pdfCropMargins" id="pdfCropMargins" checked /></td></tr>
 			<tr class="center"><td colspan="2"><input type="submit" value="Upload and send" /></td></tr>
 		</table>
 		<div id="uploadstatus"></div>
@@ -30,7 +31,7 @@
 	</div>
 	<hr/>
 	<div class="center">
-		Created by djazz. Powered by <a href="https://koajs.com/" target="_blank">Koa</a>, <a href="https://pgaskin.net/kepubify/" target="_blank">Kepubify</a> and <a href="https://www.amazon.com/gp/feature.html?ie=UTF8&docId=1000765211" target="_blank">KindleGen</a><br/>
+		Created by djazz. Powered by <a href="https://koajs.com/" target="_blank">Koa</a>, <a href="https://pgaskin.net/kepubify/" target="_blank">Kepubify</a>, <a href="https://github.com/abarker/pdfCropMargins" target="_blank">pdfCropMargins</a> and <a href="https://www.amazon.com/gp/feature.html?ie=UTF8&docId=1000765211" target="_blank">KindleGen</a><br/>
 		Source code on <a href="https://github.com/daniel-j/send2ereader" target="_blank">Github</a> - <a id="siteurl">https://send.djazz.se</span>
 	</div>
 </div>