nfp_sites/api/pagination/helpers.mjs

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import _ from 'lodash'
import config from '../config.mjs'
function limit(value, min, max, fallback) {
let out = parseInt(value, 10)
if (!out) {
out = fallback
}
if (out < min) {
out = min
}
if (out > max) {
out = max
}
return out
}
export function parsePagination(ctx) {
let out = {
perPage: limit(ctx.query.perPage, 1, 1500, 1250),
page: limit(ctx.query.page, 1, Number.MAX_SAFE_INTEGER, 1),
}
Object.keys(ctx.query).forEach(item => {
if (item.startsWith('perPage.')) {
let name = item.substring(8)
out[name] = {
perPage: limit(ctx.query[`perPage.${name}`], 1, 1500, 1250),
page: limit(ctx.query[`page.${name}`], 1, Number.MAX_SAFE_INTEGER, 1),
}
}
})
return out
}
export function parseFilter(ctx) {
let where
let whereNot
where = _.omitBy(ctx.query, test => test[0] === '!')
whereNot = _.pickBy(ctx.query, test => test[0] === '!')
whereNot = _.transform(
whereNot,
(result, value, key) => (result[key] = value.slice(1))
)
return {
where: pick => _.pick(where, pick),
whereNot: pick => _.pick(whereNot, pick),
includes: (ctx.query.includes && ctx.query.includes.split(',')) || [],
}
}
export function generateLinks(ctx, total) {
let out = []
let base = _(ctx.query)
.omit(['page'])
.transform((res, val, key) => res.push(`${key}=${val}`), [])
.value()
if (!ctx.query.perPage) {
base.push(`perPage=${ctx.state.pagination.perPage}`)
}
// let protocol = ctx.protocol
// if (config.get('frontend:url').startsWith('https')) {
// protocol = 'https'
// }
let proto = 'http'
if (config.get('frontend:url').startsWith('https')) {
proto = 'https'
}
let first = new URL(ctx.path, proto + '://' + ctx.host).toString()
first += `?${base.join('&')}`
// Add the current page first
out.push({
rel: 'current',
title: `Page ${ctx.query.page || 1}`,
url: `${first}`,
})
// Then add any previous pages if we can
if (ctx.state.pagination.page > 1) {
out.push({
rel: 'previous',
title: 'Previous',
url: `${first}&page=${ctx.state.pagination.page - 1}`,
})
out.push({
rel: 'first',
title: 'First',
url: `${first}&page=1`,
})
}
// Then add any next pages if we can
if ((ctx.state.pagination.perPage * (ctx.state.pagination.page - 1)) + ctx.state.pagination.perPage < total) {
out.push({
rel: 'next',
title: 'Next',
url: `${first}&page=${ctx.state.pagination.page + 1}`,
})
out.push({
rel: 'last',
title: 'Last',
url: `${first}&page=${Math.ceil(total / ctx.state.pagination.perPage)}`,
})
}
return out
}