prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  [reply refactor] Allow journalists to download replies from journalist interface
  After #3673 is implemented, we should allow journalists to download replies from the journalist interface UI. Note that for long-running SecureDrop instances, there will be old replies encrypted only to the source key that should be unavailable for download.
  
  Epic: #3097
  
  </issue>
  <code>
  [start of securedrop/journalist_app/col.py]
  1 # -*- coding: utf-8 -*-
  2 
  3 from flask import (Blueprint, redirect, url_for, render_template, flash,
  4                    request, abort, send_file, current_app)
  5 from flask_babel import gettext
  6 from sqlalchemy.orm.exc import NoResultFound
  7 
  8 from db import db
  9 from models import Submission
  10 from journalist_app.forms import ReplyForm
  11 from journalist_app.utils import (make_star_true, make_star_false, get_source,
  12                                   delete_collection, col_download_unread,
  13                                   col_download_all, col_star, col_un_star,
  14                                   col_delete)
  15 
  16 
  17 def make_blueprint(config):
  18     view = Blueprint('col', __name__)
  19 
  20     @view.route('/add_star/<filesystem_id>', methods=('POST',))
  21     def add_star(filesystem_id):
  22         make_star_true(filesystem_id)
  23         db.session.commit()
  24         return redirect(url_for('main.index'))
  25 
  26     @view.route("/remove_star/<filesystem_id>", methods=('POST',))
  27     def remove_star(filesystem_id):
  28         make_star_false(filesystem_id)
  29         db.session.commit()
  30         return redirect(url_for('main.index'))
  31 
  32     @view.route('/<filesystem_id>')
  33     def col(filesystem_id):
  34         form = ReplyForm()
  35         source = get_source(filesystem_id)
  36         source.has_key = current_app.crypto_util.getkey(filesystem_id)
  37         return render_template("col.html", filesystem_id=filesystem_id,
  38                                source=source, form=form)
  39 
  40     @view.route('/delete/<filesystem_id>', methods=('POST',))
  41     def delete_single(filesystem_id):
  42         """deleting a single collection from its /col page"""
  43         source = get_source(filesystem_id)
  44         delete_collection(filesystem_id)
  45         flash(gettext("{source_name}'s collection deleted")
  46               .format(source_name=source.journalist_designation),
  47               "notification")
  48         return redirect(url_for('main.index'))
  49 
  50     @view.route('/process', methods=('POST',))
  51     def process():
  52         actions = {'download-unread': col_download_unread,
  53                    'download-all': col_download_all, 'star': col_star,
  54                    'un-star': col_un_star, 'delete': col_delete}
  55         if 'cols_selected' not in request.form:
  56             flash(gettext('No collections selected.'), 'error')
  57             return redirect(url_for('main.index'))
  58 
  59         # getlist is cgi.FieldStorage.getlist
  60         cols_selected = request.form.getlist('cols_selected')
  61         action = request.form['action']
  62 
  63         if action not in actions:
  64             return abort(500)
  65 
  66         method = actions[action]
  67         return method(cols_selected)
  68 
  69     @view.route('/<filesystem_id>/<fn>')
  70     def download_single_submission(filesystem_id, fn):
  71         """Sends a client the contents of a single submission."""
  72         if '..' in fn or fn.startswith('/'):
  73             abort(404)
  74 
  75         try:
  76             Submission.query.filter(
  77                 Submission.filename == fn).one().downloaded = True
  78             db.session.commit()
  79         except NoResultFound as e:
  80             current_app.logger.error(
  81                 "Could not mark " + fn + " as downloaded: %s" % (e,))
  82 
  83         return send_file(current_app.storage.path(filesystem_id, fn),
  84                          mimetype="application/pgp-encrypted")
  85 
  86     return view
  87
  [end of securedrop/journalist_app/col.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/securedrop/journalist_app/col.py b/securedrop/journalist_app/col.py
  --- a/securedrop/journalist_app/col.py
  +++ b/securedrop/journalist_app/col.py
  @@ -67,18 +67,21 @@
           return method(cols_selected)
   
       @view.route('/<filesystem_id>/<fn>')
  -    def download_single_submission(filesystem_id, fn):
  -        """Sends a client the contents of a single submission."""
  +    def download_single_file(filesystem_id, fn):
  +        """Sends a client the contents of a single file, either a submission
  +        or a journalist reply"""
           if '..' in fn or fn.startswith('/'):
               abort(404)
   
  -        try:
  -            Submission.query.filter(
  -                Submission.filename == fn).one().downloaded = True
  -            db.session.commit()
  -        except NoResultFound as e:
  -            current_app.logger.error(
  -                "Could not mark " + fn + " as downloaded: %s" % (e,))
  +        # only mark as read when it's a submission (and not a journalist reply)
  +        if not fn.endswith('reply.gpg'):
  +            try:
  +                Submission.query.filter(
  +                    Submission.filename == fn).one().downloaded = True
  +                db.session.commit()
  +            except NoResultFound as e:
  +                current_app.logger.error(
  +                    "Could not mark " + fn + " as downloaded: %s" % (e,))
   
           return send_file(current_app.storage.path(filesystem_id, fn),
                            mimetype="application/pgp-encrypted")
  
verification_info: {"golden_diff": "diff --git a/securedrop/journalist_app/col.py b/securedrop/journalist_app/col.py\n--- a/securedrop/journalist_app/col.py\n+++ b/securedrop/journalist_app/col.py\n@@ -67,18 +67,21 @@\n         return method(cols_selected)\n \n     @view.route('/<filesystem_id>/<fn>')\n-    def download_single_submission(filesystem_id, fn):\n-        \"\"\"Sends a client the contents of a single submission.\"\"\"\n+    def download_single_file(filesystem_id, fn):\n+        \"\"\"Sends a client the contents of a single file, either a submission\n+        or a journalist reply\"\"\"\n         if '..' in fn or fn.startswith('/'):\n             abort(404)\n \n-        try:\n-            Submission.query.filter(\n-                Submission.filename == fn).one().downloaded = True\n-            db.session.commit()\n-        except NoResultFound as e:\n-            current_app.logger.error(\n-                \"Could not mark \" + fn + \" as downloaded: %s\" % (e,))\n+        # only mark as read when it's a submission (and not a journalist reply)\n+        if not fn.endswith('reply.gpg'):\n+            try:\n+                Submission.query.filter(\n+                    Submission.filename == fn).one().downloaded = True\n+                db.session.commit()\n+            except NoResultFound as e:\n+                current_app.logger.error(\n+                    \"Could not mark \" + fn + \" as downloaded: %s\" % (e,))\n \n         return send_file(current_app.storage.path(filesystem_id, fn),\n                          mimetype=\"application/pgp-encrypted\")\n", "issue": "[reply refactor] Allow journalists to download replies from journalist interface\nAfter #3673 is implemented, we should allow journalists to download replies from the journalist interface UI. Note that for long-running SecureDrop instances, there will be old replies encrypted only to the source key that should be unavailable for download.\r\n\r\nEpic: #3097\n", "before_files": [{"content": "# -*- coding: utf-8 -*-\n\nfrom flask import (Blueprint, redirect, url_for, render_template, flash,\n                   request, abort, send_file, current_app)\nfrom flask_babel import gettext\nfrom sqlalchemy.orm.exc import NoResultFound\n\nfrom db import db\nfrom models import Submission\nfrom journalist_app.forms import ReplyForm\nfrom journalist_app.utils import (make_star_true, make_star_false, get_source,\n                                  delete_collection, col_download_unread,\n                                  col_download_all, col_star, col_un_star,\n                                  col_delete)\n\n\ndef make_blueprint(config):\n    view = Blueprint('col', __name__)\n\n    @view.route('/add_star/<filesystem_id>', methods=('POST',))\n    def add_star(filesystem_id):\n        make_star_true(filesystem_id)\n        db.session.commit()\n        return redirect(url_for('main.index'))\n\n    @view.route(\"/remove_star/<filesystem_id>\", methods=('POST',))\n    def remove_star(filesystem_id):\n        make_star_false(filesystem_id)\n        db.session.commit()\n        return redirect(url_for('main.index'))\n\n    @view.route('/<filesystem_id>')\n    def col(filesystem_id):\n        form = ReplyForm()\n        source = get_source(filesystem_id)\n        source.has_key = current_app.crypto_util.getkey(filesystem_id)\n        return render_template(\"col.html\", filesystem_id=filesystem_id,\n                               source=source, form=form)\n\n    @view.route('/delete/<filesystem_id>', methods=('POST',))\n    def delete_single(filesystem_id):\n        \"\"\"deleting a single collection from its /col page\"\"\"\n        source = get_source(filesystem_id)\n        delete_collection(filesystem_id)\n        flash(gettext(\"{source_name}'s collection deleted\")\n              .format(source_name=source.journalist_designation),\n              \"notification\")\n        return redirect(url_for('main.index'))\n\n    @view.route('/process', methods=('POST',))\n    def process():\n        actions = {'download-unread': col_download_unread,\n                   'download-all': col_download_all, 'star': col_star,\n                   'un-star': col_un_star, 'delete': col_delete}\n        if 'cols_selected' not in request.form:\n            flash(gettext('No collections selected.'), 'error')\n            return redirect(url_for('main.index'))\n\n        # getlist is cgi.FieldStorage.getlist\n        cols_selected = request.form.getlist('cols_selected')\n        action = request.form['action']\n\n        if action not in actions:\n            return abort(500)\n\n        method = actions[action]\n        return method(cols_selected)\n\n    @view.route('/<filesystem_id>/<fn>')\n    def download_single_submission(filesystem_id, fn):\n        \"\"\"Sends a client the contents of a single submission.\"\"\"\n        if '..' in fn or fn.startswith('/'):\n            abort(404)\n\n        try:\n            Submission.query.filter(\n                Submission.filename == fn).one().downloaded = True\n            db.session.commit()\n        except NoResultFound as e:\n            current_app.logger.error(\n                \"Could not mark \" + fn + \" as downloaded: %s\" % (e,))\n\n        return send_file(current_app.storage.path(filesystem_id, fn),\n                         mimetype=\"application/pgp-encrypted\")\n\n    return view\n", "path": "securedrop/journalist_app/col.py"}]}