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/**
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 * Check for write permission for the selected plugin type
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 *
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 * @module      moodle-tool_installaddon-permcheck
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 * @author      David Mudrak <david@moodle.com>
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 */
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YUI.add('moodle-tool_installaddon-permcheck', function(Y) {
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    M.tool_installaddon = M.tool_installaddon || {};
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    /**
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     * @class permcheck
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     * @static
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     */
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    M.tool_installaddon.permcheck = {
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        /**
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         * @method init
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         * @param {Object} config Configuration passed from the PHP
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         */
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        init : function(config) {
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            this.config = config;
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            var plugintypesel = Y.one('#tool_installaddon_installfromzip_plugintype');
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            if (plugintypesel) {
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                plugintypesel.on('change', function() {
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                    this.check_for_permission(plugintypesel);
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                }, this);
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                this.repeat_permcheck_icon = Y.Node.create('<div><a href="#repeat-permcheck"><img src="' + M.util.image_url('i/reload') + '" /> ' +
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                    M.util.get_string('permcheckrepeat', 'tool_installaddon') + '</a></div>');
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                this.repeat_permcheck_icon.one('a').on('click', function(e) {
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                    e.preventDefault();
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                    this.check_for_permission(plugintypesel);
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                }, this);
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            }
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        },
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        /**
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         * @method check_for_permission
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         * @param {Node} plugintypesel Plugin type selector node
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         */
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        check_for_permission : function(plugintypesel) {
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            var plugintype = plugintypesel.get('value');
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            if (plugintype == '') {
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                return;
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            }
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            Y.log('Selected plugin type: ' + plugintype, 'debug', 'moodle-tool_installaddon-permcheck');
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            Y.io(this.config.permcheckurl, {
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                'method' : 'GET',
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                'data' : {
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                    'sesskey' : M.cfg.sesskey,
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                    'plugintype' : plugintype
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                },
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                'context' : this,
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                'on' : {
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                    'start' : function(transid, args) {
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                        this.showresult(M.util.get_string('permcheckprogress', 'tool_installaddon'), 'progress');
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                    },
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                    'success': function(transid, outcome, args) {
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                        var response;
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                        try {
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                            response = Y.JSON.parse(outcome.responseText);
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                            if (response.error) {
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                                Y.log(response.error, 'error', 'moodle-tool_installaddon-permcheck');
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                                this.showresult(M.util.get_string('permcheckerror', 'tool_installaddon', response), 'error');
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                            } else if (response.path && response.writable == 1) {
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                                this.showresult(M.util.get_string('permcheckresultyes', 'tool_installaddon', response), 'success');
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                            } else if (response.path && response.writable == 0) {
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                                this.showresult(M.util.get_string('permcheckresultno', 'tool_installaddon', response), 'error');
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                            } else {
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                                Y.log(response, 'debug', 'moodle-tool_installaddon-permcheck');
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                                this.showresult(M.util.get_string('permcheckerror', 'tool_installaddon', response), 'error');
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                            }
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                        } catch (e) {
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                            Y.log(e, 'error', 'moodle-tool_installaddon-permcheck');
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                            this.showresult(M.util.get_string('permcheckerror', 'tool_installaddon'), 'error');
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                        }
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                    },
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                    'failure': function(transid, outcome, args) {
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                        Y.log(outcome.statusText, 'error', 'moodle-tool_installaddon-permcheck');
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                        this.showresult(M.util.get_string('permcheckerror', 'tool_installaddon'));
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                    }
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                }
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            });
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        },
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        /**
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         * @method showresult
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         * @param {String} msg Message to display
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         * @param {String} status Message status
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         */
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        showresult : function(msg, status) {
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            var resultline = Y.one('#tool_installaddon_installfromzip_permcheck');
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            if (resultline) {
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                if (status === 'success') {
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                    resultline.setHTML('<span class="success"><img src="' + M.util.image_url('i/valid') + '" /> ' +
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                        msg + '</span>');
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                } else if (status === 'progress') {
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                    resultline.setHTML('<span class="progress"><img src="' + M.cfg.loadingicon + '" /> ' +
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                        msg + '</span>');
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                } else {
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                    resultline.setHTML('<span class="error"><img src="' + M.util.image_url('i/invalid') + '" /> ' +
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                        msg + '</span>').append(this.repeat_permcheck_icon);
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                }
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            }
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        },
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        /**
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         * @property
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         * @type {Y.Node}
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         */
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        repeat_permcheck_icon : null,
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        /**
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         * @property
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         * @type {Object}
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         */
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        config : null
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    };
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}, '@VERSION@', {
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    requires:['node', 'event', 'io-base']
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});