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102 lines
3.8 KiB
JavaScript
102 lines
3.8 KiB
JavaScript
// ### prevNext helper exposes methods for prev_post and next_post - separately defined in helpers index.
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// Example usages
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// `{{#prev_post}}<a href ="{{url}}>previous post</a>{{/prev_post}}'
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// `{{#next_post}}<a href ="{{url absolute="true">next post</a>{{/next_post}}'
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const {logging, tpl, api, hbs, checks} = require('../services/proxy');
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const get = require('lodash/get');
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const Promise = require('bluebird');
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const moment = require('moment');
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const messages = {
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mustBeCalledAsBlock: 'The {{{helperName}}} helper must be called as a block. E.g. {{#{helperName}}}...{{/{helperName}}}'
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};
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const createFrame = hbs.handlebars.createFrame;
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const buildApiOptions = function buildApiOptions(options, post) {
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const publishedAt = moment(post.published_at).format('YYYY-MM-DD HH:mm:ss');
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const slug = post.slug;
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const op = options.name === 'prev_post' ? '<=' : '>';
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const order = options.name === 'prev_post' ? 'desc' : 'asc';
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const apiOptions = {
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/**
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* @deprecated: single authors was superceded by multiple authors in Ghost 1.22.0
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*/
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include: 'author,authors,tags',
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order: 'published_at ' + order,
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limit: 1,
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// This line deliberately uses double quotes because GQL cannot handle either double quotes
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// or escaped singles, see TryGhost/GQL#34
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filter: "slug:-" + slug + "+published_at:" + op + "'" + publishedAt + "'" // eslint-disable-line quotes
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};
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if (get(options, 'hash.in')) {
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if (options.hash.in === 'primary_tag' && get(post, 'primary_tag.slug')) {
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apiOptions.filter += '+primary_tag:' + post.primary_tag.slug;
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} else if (options.hash.in === 'primary_author' && get(post, 'primary_author.slug')) {
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apiOptions.filter += '+primary_author:' + post.primary_author.slug;
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} else if (options.hash.in === 'author' && get(post, 'author.slug')) {
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apiOptions.filter += '+author:' + post.author.slug;
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}
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}
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return apiOptions;
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};
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const fetch = function fetch(options, data) {
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const self = this;
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const apiOptions = buildApiOptions(options, this);
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const apiVersion = data.root._locals.apiVersion;
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// @TODO: https://github.com/TryGhost/Ghost/issues/10548
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const controller = api[apiVersion].postsPublic || api[apiVersion].posts;
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return controller
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.browse(apiOptions)
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.then(function handleSuccess(result) {
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const related = result.posts[0];
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if (related) {
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return options.fn(related, {data: data});
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} else {
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return options.inverse(self, {data: data});
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}
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})
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.catch(function handleError(err) {
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logging.error(err);
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data.error = err.message;
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return options.inverse(self, {data: data});
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});
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};
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// If prevNext method is called without valid post data then we must return a promise, if there is valid post data
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// then the promise is handled in the api call.
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module.exports = function prevNext(options) {
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options = options || {};
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const data = createFrame(options.data);
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const context = options.data.root.context;
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// Guard against incorrect usage of the helpers
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if (!options.fn || !options.inverse) {
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data.error = tpl(messages.mustBeCalledAsBlock, {helperName: options.name});
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logging.warn(data.error);
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return Promise.resolve();
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}
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if (context.includes('preview')) {
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return Promise.resolve(options.inverse(this, {data: data}));
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}
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// Guard against trying to execute prev/next on pages, or other resources
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if (!checks.isPost(this) || this.page) {
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return Promise.resolve(options.inverse(this, {data: data}));
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}
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// With the guards out of the way, attempt to build the apiOptions, and then fetch the data
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return fetch.call(this, options, data);
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};
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