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/*
Copyright 2018 Google LLC
Use of this source code is governed by an MIT-style
license that can be found in the LICENSE file or at
https://opensource.org/licenses/MIT.
*/
const ol = require('common-tags').oneLine;
const errors = require('./errors');
const stringifyWithoutComments = require('./stringify-without-comments');
/**
* Given a set of options that configures `sw-toolbox`'s behavior, convert it
* into a string that would configure equivalent `workbox-sw` behavior.
*
* @param {Object} options See
* https://googlechromelabs.github.io/sw-toolbox/api.html#options
* @return {string} A JSON string representing the equivalent options.
*
* @private
*/
function getOptionsString(options = {}) {
let plugins = [];
if (options.plugins) {
// Using libs because JSON.stringify won't handle functions.
plugins = options.plugins.map(stringifyWithoutComments);
delete options.plugins;
}
// Pull handler-specific config from the options object, since they are
// not directly used to construct a Plugin instance. If set, need to be
// passed as options to the handler constructor instead.
const handlerOptionKeys = [
'cacheName',
'networkTimeoutSeconds',
'fetchOptions',
'matchOptions',
];
const handlerOptions = {};
for (const key of handlerOptionKeys) {
if (key in options) {
handlerOptions[key] = options[key];
delete options[key];
}
}
const pluginsMapping = {
backgroundSync: 'workbox.backgroundSync.Plugin',
broadcastUpdate: 'workbox.broadcastUpdate.Plugin',
expiration: 'workbox.expiration.Plugin',
cacheableResponse: 'workbox.cacheableResponse.Plugin',
};
for (const [pluginName, pluginConfig] of Object.entries(options)) {
// Ensure that we have some valid configuration to pass to Plugin().
if (Object.keys(pluginConfig).length === 0) {
continue;
}
const pluginString = pluginsMapping[pluginName];
if (!pluginString) {
throw new Error(`${errors['bad-runtime-caching-config']} ${pluginName}`);
}
let pluginCode;
switch (pluginName) {
// Special case logic for plugins that have a required parameter, and then
// an additional optional config parameter.
case 'backgroundSync': {
const name = pluginConfig.name;
pluginCode = `new ${pluginString}(${JSON.stringify(name)}`;
if ('options' in pluginConfig) {
pluginCode += `, ${stringifyWithoutComments(pluginConfig.options)}`;
}
pluginCode += `)`;
break;
}
case 'broadcastUpdate': {
const channelName = pluginConfig.channelName;
const opts = Object.assign({channelName}, pluginConfig.options);
pluginCode = `new ${pluginString}(${stringifyWithoutComments(opts)})`;
break;
}
// For plugins that just pass in an Object to the constructor, like
// expiration and cacheableResponse
default: {
pluginCode = `new ${pluginString}(${stringifyWithoutComments(
pluginConfig
)})`;
}
}
plugins.push(pluginCode);
}
if (Object.keys(handlerOptions).length > 0 || plugins.length > 0) {
const optionsString = JSON.stringify(handlerOptions).slice(1, -1);
return ol`{
${optionsString ? optionsString + ',' : ''}
plugins: [${plugins.join(', ')}]
}`;
} else {
return '';
}
}
module.exports = (runtimeCaching = []) => {
return runtimeCaching.map((entry) => {
const method = entry.method || 'GET';
if (!entry.urlPattern) {
throw new Error(errors['urlPattern-is-required']);
}
if (!entry.handler) {
throw new Error(errors['handler-is-required']);
}
// This validation logic is a bit too gnarly for joi, so it's manually
// implemented here.
if (entry.options && entry.options.networkTimeoutSeconds &&
entry.handler !== 'NetworkFirst') {
throw new Error(errors['invalid-network-timeout-seconds']);
}
// urlPattern might be a string, a RegExp object, or a function.
// If it's a string, it needs to be quoted.
const matcher = typeof entry.urlPattern === 'string' ?
JSON.stringify(entry.urlPattern) :
entry.urlPattern;
if (typeof entry.handler === 'string') {
const optionsString = getOptionsString(entry.options || {});
const strategyString =
`new workbox.strategies.${entry.handler}(${optionsString})`;
return `workbox.routing.registerRoute(` +
`${matcher}, ${strategyString}, '${method}');\n`;
} else if (typeof entry.handler === 'function') {
return `workbox.routing.registerRoute(` +
`${matcher}, ${entry.handler}, '${method}');\n`;
}
}).filter((entry) => Boolean(entry)); // Remove undefined map() return values.
};