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/*jshint -W083 */
var H5PUpgrades = H5PUpgrades || {};
H5P.ContentUpgradeProcess = (function (Version) {
/**
* @class
* @namespace H5P
*/
function ContentUpgradeProcess(name, oldVersion, newVersion, params, id, loadLibrary, done) {
var self = this;
// Make params possible to work with
try {
params = JSON.parse(params);
if (!(params instanceof Object)) {
throw true;
}
}
catch (event) {
return done({
type: 'errorParamsBroken',
id: id
});
}
self.loadLibrary = loadLibrary;
self.upgrade(name, oldVersion, newVersion, params.params, params.metadata, function (err, upgradedParams, upgradedMetadata) {
if (err) {
err.id = id;
return done(err);
}
done(null, JSON.stringify({params: upgradedParams, metadata: upgradedMetadata}));
});
}
/**
* Run content upgrade.
*
* @public
* @param {string} name
* @param {Version} oldVersion
* @param {Version} newVersion
* @param {Object} params
* @param {Object} metadata
* @param {Function} done
*/
ContentUpgradeProcess.prototype.upgrade = function (name, oldVersion, newVersion, params, metadata, done) {
var self = this;
// Load library details and upgrade routines
self.loadLibrary(name, newVersion, function (err, library) {
if (err) {
return done(err);
}
if (library.semantics === null) {
return done({
type: 'libraryMissing',
library: library.name + ' ' + library.version.major + '.' + library.version.minor
});
}
// Run upgrade routines on params
self.processParams(library, oldVersion, newVersion, params, metadata, function (err, params, metadata) {
if (err) {
return done(err);
}
// Check if any of the sub-libraries need upgrading
asyncSerial(library.semantics, function (index, field, next) {
self.processField(field, params[field.name], function (err, upgradedParams) {
if (upgradedParams) {
params[field.name] = upgradedParams;
}
next(err);
});
}, function (err) {
done(err, params, metadata);
});
});
});
};
/**
* Run upgrade hooks on params.
*
* @public
* @param {Object} library
* @param {Version} oldVersion
* @param {Version} newVersion
* @param {Object} params
* @param {Function} next
*/
ContentUpgradeProcess.prototype.processParams = function (library, oldVersion, newVersion, params, metadata, next) {
if (H5PUpgrades[library.name] === undefined) {
if (library.upgradesScript) {
// Upgrades script should be loaded so the upgrades should be here.
return next({
type: 'scriptMissing',
library: library.name + ' ' + newVersion
});
}
// No upgrades script. Move on
return next(null, params, metadata);
}
// Run upgrade hooks. Start by going through major versions
asyncSerial(H5PUpgrades[library.name], function (major, minors, nextMajor) {
if (major < oldVersion.major || major > newVersion.major) {
// Older than the current version or newer than the selected
nextMajor();
}
else {
// Go through the minor versions for this major version
asyncSerial(minors, function (minor, upgrade, nextMinor) {
minor =+ minor;
if (minor <= oldVersion.minor || minor > newVersion.minor) {
// Older than or equal to the current version or newer than the selected
nextMinor();
}
else {
// We found an upgrade hook, run it
var unnecessaryWrapper = (upgrade.contentUpgrade !== undefined ? upgrade.contentUpgrade : upgrade);
try {
unnecessaryWrapper(params, function (err, upgradedParams, upgradedExtras) {
params = upgradedParams;
if (upgradedExtras && upgradedExtras.metadata) { // Optional
metadata = upgradedExtras.metadata;
}
nextMinor(err);
}, {metadata: metadata});
}
catch (err) {
if (console && console.error) {
console.error("Error", err.stack);
console.error("Error", err.name);
console.error("Error", err.message);
}
next(err);
}
}
}, nextMajor);
}
}, function (err) {
next(err, params, metadata);
});
};
/**
* Process parameter fields to find and upgrade sub-libraries.
*
* @public
* @param {Object} field
* @param {Object} params
* @param {Function} done
*/
ContentUpgradeProcess.prototype.processField = function (field, params, done) {
var self = this;
if (params === undefined || params === null) {
return done();
}
switch (field.type) {
case 'library':
if (params.library === undefined || params.params === undefined) {
return done();
}
// Look for available upgrades
var usedLib = params.library.split(' ', 2);
for (var i = 0; i < field.options.length; i++) {
var availableLib = (typeof field.options[i] === 'string') ? field.options[i].split(' ', 2) : field.options[i].name.split(' ', 2);
if (availableLib[0] === usedLib[0]) {
if (availableLib[1] === usedLib[1]) {
return done(); // Same version
}
// We have different versions
var usedVer = new Version(usedLib[1]);
var availableVer = new Version(availableLib[1]);
if (usedVer.major > availableVer.major || (usedVer.major === availableVer.major && usedVer.minor >= availableVer.minor)) {
return done({
type: 'errorTooHighVersion',
used: usedLib[0] + ' ' + usedVer,
supported: availableLib[0] + ' ' + availableVer
}); // Larger or same version that's available
}
// A newer version is available, upgrade params
return self.upgrade(availableLib[0], usedVer, availableVer, params.params, params.metadata, function (err, upgradedParams, upgradedMetadata) {
if (!err) {
params.library = availableLib[0] + ' ' + availableVer.major + '.' + availableVer.minor;
params.params = upgradedParams;
if (upgradedMetadata) {
params.metadata = upgradedMetadata;
}
}
done(err, params);
});
}
}
// Content type was not supporte by the higher version
done({
type: 'errorNotSupported',
used: usedLib[0] + ' ' + usedVer
});
break;
case 'group':
if (field.fields.length === 1 && field.isSubContent !== true) {
// Single field to process, wrapper will be skipped
self.processField(field.fields[0], params, function (err, upgradedParams) {
if (upgradedParams) {
params = upgradedParams;
}
done(err, params);
});
}
else {
// Go through all fields in the group
asyncSerial(field.fields, function (index, subField, next) {
var paramsToProcess = params ? params[subField.name] : null;
self.processField(subField, paramsToProcess, function (err, upgradedParams) {
if (upgradedParams) {
params[subField.name] = upgradedParams;
}
next(err);
});
}, function (err) {
done(err, params);
});
}
break;
case 'list':
// Go trough all params in the list
asyncSerial(params, function (index, subParams, next) {
self.processField(field.field, subParams, function (err, upgradedParams) {
if (upgradedParams) {
params[index] = upgradedParams;
}
next(err);
});
}, function (err) {
done(err, params);
});
break;
default:
done();
}
};
/**
* Helps process each property on the given object asynchronously in serial order.
*
* @private
* @param {Object} obj
* @param {Function} process
* @param {Function} finished
*/
var asyncSerial = function (obj, process, finished) {
var id, isArray = obj instanceof Array;
// Keep track of each property that belongs to this object.
if (!isArray) {
var ids = [];
for (id in obj) {
if (obj.hasOwnProperty(id)) {
ids.push(id);
}
}
}
var i = -1; // Keeps track of the current property
/**
* Private. Process the next property
*/
var next = function () {
id = isArray ? i : ids[i];
process(id, obj[id], check);
};
/**
* Private. Check if we're done or have an error.
*
* @param {String} err
*/
var check = function (err) {
// We need to use a real async function in order for the stack to clear.
setTimeout(function () {
i++;
if (i === (isArray ? obj.length : ids.length) || (err !== undefined && err !== null)) {
finished(err);
}
else {
next();
}
}, 0);
};
check(); // Start
};
return ContentUpgradeProcess;
})(H5P.Version);