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LICENSE

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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
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+                            Preamble
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+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

+ 95 - 0
README.md

@@ -0,0 +1,95 @@
+# Postlink
+In our church we send each week a so-called ***infomail***, an email with current events, information and news. But circa a dozen older poeple can't access emails, so therefore we print a dozen *infomails*, and give them some people before each sunday service and some we send via the physical post.
+
+This is quite tedious, so this project was made to automate the whole workflow. This equates to half an hour time saved each week.
+
+## How does it work?
+There is a seperate email address, where the *infomail* gets sent to. the postlink script periodically checks if a new email is in the inbox, and generates a pdf suitable for printing using custom rules.
+
+The pdf then ist uploaded via a customizable command to a church computer, that uses it's own script to automatically print out the desired number of *infomails*.
+
+Also, the pdf is customized with cover letters and uploaded to the (pingen.com api)[https://pingen.com], which is a service that prints the letters out and and sends them out via the physical post.
+
+Now the only things we need to do is keep the server on which the postlink script runs running and ensuring the pingen.com account has enough credit.
+
+## Installation
+On a Unix-like server install
+ - (and enable) a cronjob daemon like (cronie)[https://github.com/cronie-crond/cronie] [optional but recommended for periodic runs]
+ - a recent version of [nodejs](https://nodejs.org/en/download)
+
+Clone this repo and cd into it:
+    git clone https://github.com/noahvogt/postlink.js
+    cd postlink
+
+Then, install the dependencies:
+    npm install puppeteer imap-simple yaml jsdom quoted-printable pdf-merger-js pdf-lib axios
+
+Apply your custom config in `config.yaml`. This example config serves enough of an explanation. If not, consult the source code.
+
+```yaml
+imap:
+  user: whatever@example.org
+  password: REDACTED
+  host: mail.example.org
+  port: 993
+  tls: true
+pingen:
+  client_id: YOUR_CLIENT_ID
+  client_secret: YOUR_CLIENT_SECRET
+  organisation_id: YOUR_ORGANISATION_ID
+upload:
+  cmd: "rsync -uvP /home/postlink/infomail.pdf /var/www/dest/infomail.pdf"
+cover_letters:
+  - "cover_letters/noah-vogt.pdf"
+  - "cover_letters/someone-else.pdf"
+generate:
+  pdf_max_pages: 5
+  sed_options: |
+    /title="Mailchimp Email Marketing"/d;
+    /Besuchen Sie hier die Webversion/d;
+  css_styling: |
+    body {
+        margin: 0 !important;
+        padding: 0 !important;
+        background: white !important;
+        color: black !important;
+        font-family: sans-serif;
+        font-size: 12px !important;
+        line-height: 1.15 !important;
+    }
+
+    h1, h2, h3, h4 {
+      font-size: 13px !important;
+      margin: 2px 0 !important;
+    }
+
+    p, li, td, th, div {
+      font-size: 12px !important;
+      margin: 1px 0 !important;
+      padding: 0 !important;
+    }
+
+    img {
+      max-width: 60% !important;
+      height: auto !important;
+      display: block;
+      margin: 4px auto !important;
+    }
+
+    table {
+      width: 100% !important;
+      border-collapse: collapse;
+    }
+```
+
+Run via
+    node postlink.js
+
+For periodic runs we recommend, as mentioned above, cronjobs.
+
+For testing purposes, you can run with the option `--dry-run` to not upload the *infomail* the the curch computer and not send api requests to pingen.com.
+    node postlink.js --dry-run
+
+## Licensing
+
+Postlink is a free (as in “free speech” and also as in “free beer”) Software. It is distributed under the GNU General Public License v3 (or any later version) - see the accompanying LICENSE file for more details.

+ 234 - 0
postlink.js

@@ -0,0 +1,234 @@
+/* postlink: fully automate printing and sending an email as physical post
+Copyright © 2025 Noah Vogt noah@noahvogt.com
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>. */
+
+const fs = require('fs');
+const yaml = require('yaml');
+const imaps = require('imap-simple');
+const { JSDOM } = require('jsdom');
+const puppeteer = require('puppeteer');
+const path = require('path');
+const { execSync } = require('child_process');
+const PDFMerger = require('pdf-merger-js').default;
+const { PDFDocument } = require('pdf-lib');
+const axios = require('axios');
+
+const ORIGINAL_HTML_FILE = 'original-infomail.html';
+const CLEANED_HTML_FILE = 'cleaned-infomail.html';
+const GENERAL_PDF_FILE = 'infomail.pdf';
+
+const dryRun = process.argv.includes('--dry-run');
+
+async function trimPdfToMaxPages(inputPath, outputPath, maxPages) {
+  const fileBuffer = fs.readFileSync(inputPath);
+  const pdfDoc = await PDFDocument.load(fileBuffer);
+  const totalPages = pdfDoc.getPageCount();
+
+  if (totalPages <= maxPages) {
+    return;
+  }
+
+  const trimmedPdf = await PDFDocument.create();
+  const copiedPages = await trimmedPdf.copyPages(pdfDoc, [...Array(maxPages).keys()]);
+  copiedPages.forEach(p => trimmedPdf.addPage(p));
+
+  const trimmedBytes = await trimmedPdf.save();
+  fs.writeFileSync(outputPath, trimmedBytes);
+
+  console.log(`pdf shorted to ${maxPages} pages.`);
+}
+
+async function uploadToPingen(pdfPath, config) {
+    console.log(`uploading '${pdfPath}' to pingen.com api...`);
+
+    // get access token
+    const tokenRes = await axios.post(
+        'https://identity.pingen.com/auth/access-tokens',
+        new URLSearchParams({
+            grant_type: 'client_credentials',
+            client_id: config.pingen.client_id,
+            client_secret: config.pingen.client_secret
+        }),
+        {
+            headers: { 'Content-Type': 'application/x-www-form-urlencoded' }
+        }
+    );
+    const token = tokenRes.data.access_token;
+
+    // get upload url + signature
+    const uploadRes = await axios.get('https://api.pingen.com/file-upload', {
+        headers: { Authorization: `Bearer ${token}` }
+    });
+    console.log("🔎 uploadRes.data:", JSON.stringify(uploadRes.data, null, 2));
+    const {
+        url: uploadUrl,
+        url_signature: fileUrlSignature
+    } = uploadRes.data.data.attributes;
+
+    // upload pdf
+    const fileBuffer = fs.readFileSync(pdfPath);
+        await axios.put(uploadUrl, fileBuffer, {
+        headers: { 'Content-Type': 'application/pdf' }
+    });
+
+    // create mail object
+    const response = await axios.post(
+        `https://api.pingen.com/organisations/${config.pingen.organisation_id}/letters`,
+        {
+            data: {
+                type: 'letters',
+                    attributes: {
+                    file_original_name: path.basename(pdfPath),
+                    file_url: uploadUrl,
+                    file_url_signature: fileUrlSignature,
+                    address_position: 'left',
+                    auto_send: true,
+                    delivery_product: 'cheap',
+                    print_mode: 'duplex',
+                    print_spectrum: 'color'
+                }
+            }
+        },
+        {
+            headers: {
+                'Content-Type': 'application/vnd.api+json',
+                Authorization: `Bearer ${token}`
+            }
+        }
+    );
+
+console.log(`✅ Brief bei Pingen angelegt: ${response.data.data.id}`);
+}
+
+const config = yaml.parse(fs.readFileSync('config.yaml', 'utf8'));
+const imapConfig = {
+  imap: {
+    user: config.imap.user,
+    password: config.imap.password,
+    host: config.imap.host,
+    port: config.imap.port,
+    tls: config.imap.tls,
+    authTimeout: 3000
+  }
+};
+
+
+(async () => {
+    const connection = await imaps.connect(imapConfig);
+    await connection.openBox('INBOX');
+
+    const searchCriteria = ['ALL'];
+    const fetchOptions = { bodies: ['HEADER.FIELDS (FROM TO SUBJECT DATE)', 'TEXT'], struct: true };
+
+    const messages = await connection.search(searchCriteria, fetchOptions);
+
+    if (messages.length === 0) {
+        console.log('No emails found. Exiting...');
+        await connection.end();
+        return;
+    }
+
+    const latest = messages[messages.length - 1];
+    const isSeen = latest.attributes.flags.includes('\\Seen');
+
+    if (isSeen) {
+        console.log('Last email in inbox already marked as read. Exiting...');
+        await connection.end();
+        return;
+    }
+
+    const qp = require('quoted-printable');
+    const { JSDOM } = require('jsdom');
+
+    const rawBody = latest.parts.find(part => part.which === 'TEXT').body;
+
+    // decode quoted-printable S/MIME email html body
+    const decodedBody = qp.decode(rawBody);
+
+    // converted into readable html object
+    const dom = new JSDOM(decodedBody);
+    const links = [...dom.window.document.querySelectorAll('a')]
+        .map(a => a.href)
+        .filter(href => href && href.includes('mailchi.mp'));
+
+    const mailchimpLink = links[0];
+
+    if (!mailchimpLink) {
+        await connection.end();
+        console.log('No Mailchimp link found. Exiting...');
+        return;
+    }
+
+    console.log('Mailchimp link found:', mailchimpLink);
+
+    await connection.addFlags(latest.attributes.uid, '\\Seen');
+    await connection.end();
+
+    const browser = await puppeteer.launch();
+    const page = await browser.newPage();
+
+    await page.goto(mailchimpLink, { waitUntil: 'networkidle0' });
+
+    const htmlContent = await page.content();
+    fs.writeFileSync(ORIGINAL_HTML_FILE, htmlContent, 'utf-8');
+
+    // apply sed command to html file
+    fs.writeFileSync('sed_script.sed', config.generate.sed_options, 'utf-8');
+    const sedCmd = `sed -f sed_script.sed ${ORIGINAL_HTML_FILE} > ${CLEANED_HTML_FILE}`;
+    execSync(sedCmd, { shell: '/bin/bash' });
+
+    // load the new html after the sed command is applied
+    const fileUrl = 'file://' + path.resolve(CLEANED_HTML_FILE);
+    await page.goto(fileUrl, { waitUntil: 'networkidle0' });
+
+    // apply css styling
+    await page.addStyleTag({
+        content: config.generate.css_styling
+      });
+
+    await page.pdf({
+        path: GENERAL_PDF_FILE,
+        format: 'A4',
+        margin: { top: '6mm', bottom: '6mm', left: '6mm', right: '6mm' },
+        printBackground: false
+    });
+
+    await browser.close();
+    await trimPdfToMaxPages(GENERAL_PDF_FILE, GENERAL_PDF_FILE, config.generate.pdf_max_pages);
+    console.log('general pdf successfully generated.');
+
+    if (dryRun) {
+        console.log('Dry run. Exiting...')
+    } else {
+        execSync(config.upload.cmd, { shell: '/bin/bash' });
+
+        const mergerTasks = config.cover_letters || [];
+
+        // add cover letters to the general pdf file
+        for (const coverPath of mergerTasks) {
+            const name = path.basename(coverPath, '.pdf');
+            const outputFile = `infomail-${name}.pdf`;
+
+            const merger = new PDFMerger();
+            await merger.add(path.resolve(coverPath));
+            await merger.add(path.resolve(GENERAL_PDF_FILE));
+
+            await merger.save(outputFile);
+            console.log(`pdf created: '${outputFile}'.`);
+
+            await uploadToPingen(outputFile, config);
+        }
+    }
+})();