Initial check-in of the works.

Makefile

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+
+NAME = kal3000-gcal-import
+INSTALLDIR = /usr/share/wordpress/wp-content/plugins/$(NAME)
+VERSION = 0.1.0
+
+release: 
+	cd ..
+	zip -9 -r $(NAME)-$(VERSION).zip $(NAME)/*.php $(NAME)/*.txt
+
+install: 
+	mkdir -p $(INSTALLDIR)
+	cp -va *.txt *.php $(INSTALLDIR)
+	chown -R www-data:www-data $(INSTALLDIR)
+
+
+
+
+
+

gcal-import-worker.php

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+<?php
+
+defined( 'ABSPATH' ) or die( 'No script kiddies please!' );
+
+// we may need a http proxy for the fetch. Should be set from the admin page. 
+// define ('http_proxy', 'http://example.org:8080'); 
+// we'll set this as category => proxy, link => link, active => 0; 
+// in the admin page, all entries will be displayed with a checkbox for activating, deactivating, deleting. 
+
+
+
+// TODO: housekeeping function. use WP scheduler. 
+// This is where the real work is done, i.e. retrieve, parse the GCAL, and insert the posts. 
+// Posting: simulate a real HTTPS POST
+//
+
+/**
+ * The worker gets called by the WP scheduler hourly. 
+ * POST: simulates or performs a real POST. 
+ *
+ * @since 0.1.0
+ *
+ */
+
+function gcal_import_worker()
+{
+    error_log ("gcal_import_worker started", 0);
+
+    /*
+     * retrieve the proxy from the db, and if it exists, construct a context. 
+     * TODO: USER:PASS in DB. 
+     *
+     * http://www.pirob.com/2013/06/php-using-getheaders-and-filegetcontents-functions-behind-proxy.html
+
+
+     * http://ubuntu1804/site/wp-admin/post.php?post=128&action=edit
+     * vi +809 ./wp-admin/includes/post.php function wp_write_post()
+     
+     */
+
+    global $wpdb;
+    $table = $wpdb->prefix.GCAL_TABLE;
+    $structure = "SELECT gcal_category from $table ;";
+    $categories = $wpdb->query($structure);
+    foreach ( $categories as $category) {
+	error_log ("found category $category");
+        gcal_import_process_category($category);
+    }	    
+
+
+    error_log ("gcal_import_worker finished", 0);
+}	
+
+
+function gcal_import_process_category($category) {
+    global $wpdb;
+    $table = $wpdb->prefix.GCAL_TABLE;
+    $structure = "SELECT gcal_link from $table WHERE gcal_category = '$category' AND gcal_active = '1' ;";
+    $link = $wpdb->query($structure);
+        
+
+}	
+
+

gcal-import.php

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+<?php
+/**
+ * Plugin Name: Kal3000 Google Calender Importer
+ * Plugin URI:  https://github.com/hmilz/kal3000-gcal-import
+ * Description: Imports and Merges an Arbitrary Number of Public Google Calendars into Kal3000
+ * Version:     0.1
+ * Author:      Harald Milz <hm@seneca.muc.de>
+ * License:     GPLv3
+ * License URI: https://www.gnu.org/licenses/gpl-3.0
+ * Domain Path: /languages
+ *
+ * {Plugin Name} 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 2 of the License, or
+ * any later version.
+ * 
+ * {Plugin Name} 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 {Plugin Name}. If not, see {License URI}.
+ */
+
+defined( 'ABSPATH' ) or die( 'No script kiddies please!' );
+
+define ('GCAL_TABLE', 'gcal_import');
+
+// we may need a http proxy for the fetch. Should be set from the admin page. 
+// define ('http_proxy', 'http://example.org:8080'); 
+
+
+/*
+ * gcal-import-install
+ * create DB table with:
+ * - gcal_category - name of the calendar, for later per-unit display
+ * - gcal_link - the public or private .ics link
+ * - gcal_veranstalter - ?  
+ * - gcal_active - flag if a calendar is active or not. Default active. 
+ *
+ */
+
+/**
+ * Initializes the plugin and creates a table
+ *
+ * @since 0.1.0
+ *
+ * - gcal_category - name of the calendar, for later per-unit display
+ * - gcal_link - the public or private .ics link
+ * - gcal_veranstalter - ?  
+ * - gcal_active - flag if a calendar is active or not. Default active. 
+ */
+
+function gcal_import_activate()
+{
+    error_log ("gcal_import_activate started");
+    global $wpdb;
+    // CREATE will produce an error if the table exists already. 
+    $table = $wpdb->prefix.GCAL_TABLE;
+    $structure = "CREATE TABLE IF NOT EXISTS $table (
+        id INT(9) NOT NULL AUTO_INCREMENT,
+        gcal_category VARCHAR(32) NOT NULL,
+        gcal_link VARCHAR(256) NOT NULL,
+        gcal_active INT(9) DEFAULT 1,
+	UNIQUE KEY id (id)
+    );";
+    $wpdb->query($structure);
+
+/*
+    if () {
+        // Populate table
+        // this will later be set by the admin page
+        $wpdb->query("INSERT INTO $table(gcal_category, gcal_link, gcal_active)
+	    VALUES('kv-freising', 'https://calendar.google.com/calendar/ical/gruene.freising%40gmail.com/public/basic.ics', '1')");
+    }
+ */
+
+    if ( ! wp_next_scheduled( 'gcal_import_worker_hook' ) ) {
+        wp_schedule_event( time(), 'hourly', 'gcal_import_worker_hook' );
+    }
+    error_log ("gcal_import_activate finished");
+
+}
+
+register_activation_hook( __FILE__, 'gcal_import_activate' );
+
+
+
+/**
+ * Deactivate unregisters the housekeeping function.
+ *
+ * @since 0.1.0
+ *
+ */
+
+function gcal_import_deactivate()
+{
+    error_log ("gcal_import_deactivate started");
+    wp_clear_scheduled_hook('gcal_import_cron_hook' );
+    error_log ("gcal_import_deactivate finished");
+}	
+
+register_deactivation_hook( __FILE__, 'gcal_import_deactivate' );
+
+
+/**
+ * Uninstall drops our DB table
+ *
+ * @since 0.1.0
+ *
+ */
+
+function gcal_import_uninstall()
+{
+    error_log ("gcal_import_uninstall started");
+    // can we uninstall without deactivating first?     
+    // gcal_import_deactivate; 
+    global $wpdb;
+    $table = $wpdb->prefix.GCAL_TABLE;
+    $structure = "DROP TABLE $table ;";
+    $wpdb->query($structure);
+    error_log ("gcal_import_uninstall finished");
+}	
+
+register_uninstall_hook( __FILE__, 'gcal_import_uninstall' );
+
+
+/**
+ * Display the admin table
+ * may go to a separate file eventually
+ *
+ * @since 0.1.0
+ *
+ */
+
+function gcal_import_admin()
+{
+    global $wpdb;
+    $table = $wpdb->prefix.GCAL_TABLE;
+
+    // we MUST protect queries, 
+    // see https://codex.wordpress.org/Class_Reference/wpdb#Protect_Queries_Against_SQL_Injection_Attacks
+    // $sql = $wpdb->prepare( 'INSERT INTO $table ... ' , value_parameter[, value_parameter ... ] );
+    
+}
+
+
+// The real work goes here. 
+require_once dirname( __FILE__ ) . "/gcal-import-worker.php"; 
+add_action( 'gcal_import_worker_hook', 'gcal_import_worker' );
+
+
+	
+
+

readme.txt

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+=== Test Plugin ===
+Contributors: user, user, user
+Tags: tag, tag, tag
+Donate link: http://example.com/
+Requires at least: 4.0
+Tested up to: 4.8
+Requires PHP: 5.6
+Stable tag: 1.1
+License: GPLv2 or later
+License URI: http://www.gnu.org/licenses/gpl-2.0.html
+
+Short description of this great plugin. No more than 150 characters, no markup.
+
+== Description ==
+Long description of this great plugin. No characters limit, and you can use markdown.
+
+For backwards compatibility, if this section is missing, the full length of the short description will be used, and
+markdown parsed.
+
+Ordered list:
+
+1. Some feature
+1. Another feature
+1. Something else about the plugin
+
+Unordered list:
+
+* something
+* something else
+* third thing
+
+Link to [WordPress](http://wordpress.org/ "Your favorite software") and one to [Markdown's Syntax Documentation][markdown syntax].
+
+Titles are optional, naturally.
+
+Asterisks for *emphasis*.
+
+Double it up  for **strong**.
+
+== Installation ==
+1. Upload "test-plugin.php" to the "/wp-content/plugins/" directory.
+1. Activate the plugin through the "Plugins" menu in WordPress.
+1. Place "do_action( 'plugin_name_hook' );" in your templates.
+
+== Frequently Asked Questions ==
+= A question that someone might have =
+An answer to that question.
+
+= What about foo bar? =
+Answer to foo bar dilemma.
+
+== Screenshots ==
+1. The screenshot description corresponds to screenshot-1.(png|jpg|jpeg|gif).
+2. The screenshot description corresponds to screenshot-2.(png|jpg|jpeg|gif).
+3. The screenshot description corresponds to screenshot-3.(png|jpg|jpeg|gif).
+
+== Changelog ==
+= 0.2 =
+* A change since the previous version.
+* Another change.
+
+= 0.1 =
+* Initial release.
+
+== Upgrade Notice ==
+= 0.2 =
+Upgrade notices describe the reason a user should upgrade
+
+= 0.1 =
+This version fixes a security related bug. Upgrade immediately.