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normalize.js
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normalize.js
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import camelCase from 'lodash/camelCase';
import isArray from 'lodash/isArray';
import cloneDeep from 'lodash/cloneDeep';
import keys from 'lodash/keys';
import merge from 'lodash/merge';
/* eslint no-underscore-dangle: ["error", { "allow": ["_links", "_embedded"] }] */
function normalizeLink(link, normalizeUri) {
if (!link || !link.href) return link;
if (link.templated) return link;
return { ...link, href: normalizeUri(link.href) };
}
function camelizeNestedKeys(attributeValue) {
if (attributeValue === null || typeof attributeValue !== 'object') {
return attributeValue;
}
if (isArray(attributeValue)) {
return attributeValue.map(camelizeNestedKeys);
}
const copy = {};
keys(attributeValue).forEach((key) => {
copy[camelCase(key)] = camelizeNestedKeys(attributeValue[key]);
});
return copy;
}
function isResource(value) {
return value && value._links && value._links.self && (value._links.self.href != null);
}
function hasSingleKey(object, key) {
const objectKeys = Object.keys(object);
return objectKeys.length === 1 && objectKeys[0] === key;
}
function isReference(value) {
return typeof value === 'object' && value !== null && hasSingleKey(value, '_links') && hasSingleKey(value._links, 'self');
}
let extractResource;
function extractSingleEmbed(embed, ret, opts) {
if (!(opts.filterReferences && isReference(embed))) {
merge(ret, extractResource(embed, opts));
}
return normalizeLink(cloneDeep(((embed || {})._links || {}).self) || null, opts.normalizeUri);
}
function extractEmbeds(embeds, ret, opts) {
if (!isArray(embeds)) {
return extractSingleEmbed(embeds, ret, opts);
}
return embeds.map((embed) => extractSingleEmbed(embed, ret, opts));
}
function extractAllEmbedded(json, uri, opts) {
const { camelizeKeys } = opts;
const ret = { [uri]: {} };
keys(json._embedded).forEach((key) => {
if (camelizeKeys) {
ret[uri][camelCase(key)] = camelizeNestedKeys(
extractEmbeds(json._embedded[key], ret, opts),
);
} else {
ret[uri][key] = extractEmbeds(json._embedded[key], ret, opts);
}
});
return ret;
}
function extractAllLinks(json, uri, opts) {
const { camelizeKeys, normalizeUri } = opts;
const ret = { [uri]: {} };
keys(json._links).forEach((key) => {
if (key === 'self') return;
if (camelizeKeys) {
ret[uri][camelCase(key)] = normalizeLink(cloneDeep(json._links[key]), normalizeUri);
} else {
ret[uri][key] = normalizeLink(cloneDeep(json._links[key]), normalizeUri);
}
});
return ret;
}
function mergeEmbeddedStandaloneCollections(embedded, links, opts) {
const ret = {};
merge(ret, links);
merge(ret, embedded);
keys(embedded).forEach((uri) => {
keys(embedded[uri]).forEach((rel) => {
if (Array.isArray(embedded[uri][rel]) && uri in links && rel in links[uri]) {
ret[uri][rel] = links[uri][rel];
ret[links[uri][rel].href] = {
[opts.embeddedStandaloneListKey]: embedded[uri][rel],
[opts.metaKey]: { self: links[uri][rel].href },
};
}
});
});
return ret;
}
extractResource = (json, opts) => {
const { camelizeKeys, normalizeUri, metaKey } = opts;
if (!isResource(json)) {
return json;
}
const uri = normalizeUri(json._links.self.href);
const ret = { [uri]: {} };
keys(json).filter((key) => key !== '_embedded' && key !== '_links').forEach((key) => {
if (camelizeKeys) {
if (key === metaKey) {
ret[uri][metaKey] = camelizeNestedKeys(cloneDeep(json[key]));
} else {
ret[uri][camelCase(key)] = camelizeNestedKeys(cloneDeep(json[key]));
}
} else {
ret[uri][key] = cloneDeep(json[key]);
}
});
const embedded = extractAllEmbedded(json, uri, opts);
const links = extractAllLinks(json, uri, opts);
if (opts.embeddedStandaloneListKey) {
merge(ret, mergeEmbeddedStandaloneCollections(embedded, links, opts));
} else {
merge(ret, extractAllLinks(json, uri, opts));
merge(ret, extractAllEmbedded(json, uri, opts));
}
ret[uri][metaKey] = ret[uri][metaKey] || {};
ret[uri][metaKey].self = uri;
return ret;
};
export default function normalize(json, opts = {}) {
const optsWithDefaults = {
camelizeKeys: true,
normalizeUri: (uri) => uri,
metaKey: '_meta',
filterReferences: false,
...opts,
};
if (optsWithDefaults.filterReferences && isReference(json)) {
// TODO is this really the most useful way of handling this edge case?
return {};
}
return extractResource(json, optsWithDefaults);
}