Add working dockerfile and update readme

Dockerfile

@@ -0,0 +1,28 @@
+FROM php:8.1-apache
+
+
+# prep folders and perms
+RUN mkdir -p /var/www/html/episodes
+
+# prep env vars
+ENV \
+    ITEM_COUNT=10000 \
+    MP3_DIR=/var/www/html/episodes \
+    TITLE= \
+    AUTO_SAVE_COVER_ART=
+
+# add any dir2cast.ini options as env vars here
+# todo - making this reusable for all env vars
+RUN echo '; review options in dir2cast.ini source' > /var/www/html/dir2cast.ini
+RUN echo "ITEM_COUNT = ${ITEM_COUNT}" >> /var/www/html/dir2cast.ini
+RUN echo "MP3_DIR = ${MP3_DIR}" >> /var/www/html/dir2cast.ini
+RUN if [[ $TITLE ]]; then echo "TITLE = ${TITLE}" >> /var/www/html/dir2cast.ini; fi;
+RUN if [[ $AUTO_SAVE_COVER_ART ]]; then echo "AUTO_SAVE_COVER_ART = ${AUTO_SAVE_COVER_ART}" >> /var/www/html/dir2cast.ini; fi;
+
+# copy source files to docker 
+COPY ./dir2cast.php /var/www/html/
+# skip creating ini. generated above
+# COPY ./dir2cast.ini /var/www/html/
+COPY ./getID3/ /var/www/html/getID3/
+
+EXPOSE 80

README.md

@@ -49,6 +49,8 @@ Features:
 * You can set a per-file iTunes Summary by creating a text file with the same
   name as the media file (e.g. for file.mp3, create file.txt).
 
+* You can deploy a container using the ctkcoding/dir2cast Docker image
+
 
 QUICK HOW TO GUIDES
 ================================================================================
@@ -98,6 +100,46 @@ podcast that it generates uses the tags from your files.
    the "`temp`" folder that is created.
 
 
+DOCKER SETUP
+================================================================================
+Note: There are many ways to get dir2cast working under docker, and this guide
+is a product of trial and error. There are settings in dir2cast and SWAG that are
+not covered in this guide.
+
+Local setup
+-----------
+1. Map the container's port 80 to whatever port you want to access it with on your
+   local network (e.g. port 8080)
+2. Episodes will be scanned for at `/var/www/html/episodes` unless you pass in a different MP3_DIR, so make sure to create a volume to map under `/var/www/html`, or directly bind the episodes folder to a location on your file system where you wish to store episodes
+4. To start the container, try something like: 
+   `docker run --name dir2cast -d -p 8080:80 -v podcast_volume:/var/www/html/episodes ctkcoding/dir2cast:v0.1` and add env vars for settings in dir2cast.ini that you'd like to change from the default. Note below on env vars that are supported
+5. Once you add media files to the podcast_volume (or local folder), your podcast
+   feed should now exist at `<docker server ip>:<container port>/dir2cast.php`
+
+Remote using SWAG
+-----------------
+1. Install SWAG and test that you can remotely access your docker server. Here's
+   a guide https://docs.linuxserver.io/general/swag
+2. Create a `<name>.subdomain.conf` file for your podcast server container as
+   specified in the SWAG guide
+3. Add your dir2cast container to the network that you created with SWAG
+4. Check that podcasts can be played/downloaded. If your feed exists and can be
+   subscribed to, but files aren't available, try setting `MP3_URL` in the
+   `dir2cast.ini` file with an https:// URL rather than http://. (see comment in
+   that file)
+
+Notes
+-----
+* If you have shared folders that are accessible from your computer, using a bind mount
+  (rather than a docker volume) is an easy way to enable a simple workflow for you to
+  drag and drop content into the podcast feed.
+* If you see '.\_' prefixed junk files in your feed, that is an unfortunate side-effect
+  of using network shares from macOS, and not dir2cast's fault.
+* 502 errors are likely SWAG configuration problems. Check container name, port mapping, etc.
+* currently the only docker env vars that can be fed in at startup and set in dir2cast.ini are ITEM_COUNT, MP3_DIR, TITLE, AUTO_SAVE_COVER_ART. Copy the RUN commands in Dockerfile for any new env vars needed
+
+Thank you to @ctkcoding for the contribution of this guide.
+
 UNDERSTANDING HOW THE CACHING WORKS
 ================================================================================
 
@@ -218,7 +260,7 @@ To run the unit tests:
 COPYRIGHT & LICENSE
 ================================================================================
 
-Copyright (c) 2008-2021, Ben XO ([email protected]).
+Copyright (c) 2008-2023, Ben XO (@benxo on most platforms).
 
 The software is released under the BSD License.
 

dir2cast.ini

@@ -45,6 +45,8 @@
 ; This defaults to the directory of the script.
 ; dir2cast can usually work this out for you, but under some circumstances
 ; it will fail. If your MP3 URLs are all wrong, try putting this in manually.
+; If the xml/rss feed exists but podcasts won't play/download, you may need
+; to set this with https i.e. "https://www.example.foo/my_mp3_folder/"
 ;MP3_URL = "http://www.example.foo/my_mp3_folder/"
 
 ; Uncomment this if you want to check in every sub-folder for new files as well.

dir2cast.php

@@ -1,7 +1,7 @@
 <?php
 
 /******************************************************************************
- * Copyright (c) 2008-2022, Ben XO ([email protected]).
+ * Copyright (c) 2008-2023, Ben XO (@benxo on most platforms).
  *
  * All rights reserved.
  * 
@@ -1246,7 +1246,13 @@ protected function scan()
             if(self::$EMPTY_PODCAST_IS_ERROR && 0 == $item_count)
             {
                 http_response_code(404);
-                throw new Exception("No content yet.");
+                if (0 == $item_count) {
+                    throw new Exception("Item count zero.");
+                }
+                if (self::$EMPTY_PODCAST_IS_ERROR) {
+                    throw new Exception("Self empty podcast error.");
+                }
+
             }
 
             $this->calculateItemHash();