MDL-38509 Implement the plugin ZIP package validator

The validator code contains (modified) fragments of the
local_plugins_archive_validator class copyrighted by Marina Glancy that
is part of the local_plugins plugin. It operates over an extracted
copy of the ZIP file.

admin/tool/installaddon/tests/fixtures/emptydir/emptydir/README.txt

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+Plugin must have more than one file.

admin/tool/installaddon/tests/fixtures/github/moodle-repository_mahara-master/lang/en/repository_mahara.php

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+<?php

admin/tool/installaddon/tests/fixtures/github/moodle-repository_mahara-master/version.php

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+<?php
+
+$plugin->component = 'repository_mahara';
+$plugin->version = 2014010100;

admin/tool/installaddon/tests/fixtures/installed/greenbar/index.php

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+<?php
+
+echo 'One, my little hobbit, never installs malicisous add-ons';

admin/tool/installaddon/tests/fixtures/installed/greenbar/lang/en/local_greenbar.php

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+<?php
+
+$string['pluginname'] = 'Foo bar!';

admin/tool/installaddon/tests/fixtures/installed/greenbar/version.php

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+<?php
+
+$plugin->version = 2013031900;
+$plugin->component = 'local_greenbar';

admin/tool/installaddon/tests/fixtures/multidir/one/version.php

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+<?php
+
+$plugin->component = 'local_one';

admin/tool/installaddon/tests/fixtures/multidir/two/README.txt

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+Only one dir is allowed

admin/tool/installaddon/tests/fixtures/nolang/bah/index.php

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+<?php

admin/tool/installaddon/tests/fixtures/nolang/bah/lang/en/bah.php

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+<?php

admin/tool/installaddon/tests/fixtures/nolang/bah/lang/en/bleh.php

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+<?php
+
+$string['pluginnname'] = 'Root directory mismatch';

admin/tool/installaddon/tests/fixtures/nolang/bah/lib.php

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+<?php
+
+

admin/tool/installaddon/tests/fixtures/nolang/bah/version.php

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+<?php
+
+$module->version = 2014122455;
+$plugin->version = 2014122455;

admin/tool/installaddon/tests/fixtures/nolang/bah/view.php

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+<?php
+
+echo 'Do not use hardcoded strings, provide the language pack';

admin/tool/installaddon/tests/fixtures/noversionmod/noversion/lang/en/noversion.php

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+<?php
+
+$string['pluginversion'] = 'Activity module with no version.php';

admin/tool/installaddon/tests/fixtures/noversiontheme/noversion/lang/en/theme_noversion.php

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+<?php
+
+$string['pluginversion'] = 'A theme with no version.php';

admin/tool/installaddon/tests/fixtures/nowrapdir/index.php

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+<?php
+
+// index.php

admin/tool/installaddon/tests/fixtures/nowrapdir/lang/en/foo.php

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+<?php
+
+$string['pluginname'] = 'Foo!';

admin/tool/installaddon/tests/fixtures/nowrapdir/version.php

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+<?php // $Id$
+
+// I don't miss CVS, do you?

admin/tool/installaddon/tests/fixtures/plugindir/foobar/index.php

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+<?php
+
+echo 'One, my little hobbit, never installs malicisous add-ons';

admin/tool/installaddon/tests/fixtures/plugindir/foobar/lang/en/local_foobar.php

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+<?php
+
+$string['pluginname'] = 'Foo bar!';

admin/tool/installaddon/tests/fixtures/plugindir/foobar/version.php

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+<?php
+
+$module->version = 10; // Ignored, this should use $plugin
+$plugin->version = 2013031900;
+$plugin->component = 'local_foobar';
+$plugin->requires = 2013031200;
+$module->release = 'We are not an activity module!';
+$plugin->maturity = MATURITY_ALPHA;
+//$plugin->release = 'And this is commented';

admin/tool/installaddon/tests/fixtures/versionphp/version1.php

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+<h1>Example version.php file</h1>
+
+<p>version.php is required for all plugins but themes.</p>
+
+<h2>Example of values</h2>
+
+<pre>
+    $plugin->version = 2011051000;
+    $plugin->requires = 2010112400;
+    $plugin->cron = 0;
+    $plugin->component = 'plugintype_pluginname';
+    $plugin->maturity = MATURITY_STABLE;
+    $plugin->release = '2.x (Build: 2011051000)';
+    $plugin->dependencies = array('mod_forum' => ANY_VERSION, 'mod_data' => 2010020300);
+</pre>
+
+Replace $plugin with $module for activity modules, as in
+
+<pre>
+    $module->version = 2012122400;
+</pre><?php // $Id$ $module->version = 1;
+
+    $plugin->component
+        = 'old_foobar';//$plugin->component='commented';
+
+    $plugin->component      =   
+        'block_foobar';
+
+$plugin->version = 2013010100;
+ ////////$plugin->version = 0;
+    /* for activity
+       modules use:
+    $module->version = 2014131300;
+
+    ***/
+$plugin->version = "2010091855";        // Do not use quotes here.
+$plugin->version = '2010091856.9'; // Do not use quotes here.
+
+
+$plugin->requires = /* 2012010100  */ 2012122401  ;
+
+$module->maturity = MATURITY_STABLE;
+$module->maturity = 50; // If both present, the constant wins (on contrary to what PHP would do)
+$module->maturity = 'MATURITY_BETA'; // Do not use quotes here.
+
+$plugin->maturity = 10;
+$plugin->maturity = MATURITY_ALPHA;
+
+
+
+$module->release = 2.3;         $plugin->release  = 'v2.4';
+$module->release = "v2.3";      $plugin->release    = 2.4;

admin/tool/installaddon/tests/fixtures/writable/local/greenbar/README.txt

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+Existing