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main.js
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main.js
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import path from "path";
import url from "url";
import "@babel/polyfill";
import "es6-promise/auto";
import AsyncComputed from "vue-async-computed";
import BootstrapVue from "bootstrap-vue";
import bs58 from "bs58";
import Clipboard from "v-clipboard";
import Meta from "vue-meta";
import Multiselect from "vue-multiselect";
import pMap from "p-map";
import Vue from "vue";
import VueRouter from "vue-router";
import Vuex from "vuex";
import "bootstrap/dist/css/bootstrap.css";
import "bootstrap-vue/dist/bootstrap-vue.css";
import "leaflet/dist/leaflet.css";
import "vue-multiselect/dist/vue-multiselect.min.css";
import { fetchUri, fetchSchemaValidator } from "./util";
import Catalog from "./components/Catalog.vue";
import Item from "./components/Item.vue";
Vue.component("multiselect", Multiselect);
Vue.use(AsyncComputed);
Vue.use(BootstrapVue);
Vue.use(Clipboard);
Vue.use(Meta);
Vue.use(VueRouter);
Vue.use(Vuex);
const CATALOG_URL =
process.env.CATALOG_URL ||
"https://github.com/raw/cholmes/sample-stac/master/stac/catalog.json";
const STAC_VERSION =
process.env.STAC_VERSION ||
"0.9.0";
const makeRelative = uri => {
const rootURI = url.parse(CATALOG_URL);
const localURI = url.parse(uri);
if (rootURI.hostname !== localURI.hostname) {
return uri;
}
const rootPath = rootURI.path
.split("/")
.slice(0, -1)
.join("/");
return path.relative(rootPath, `${localURI.path}${localURI.hash || ""}`);
};
/**
* Generate a slug (short, URL-encodable string) for a URI.
*
* @param {String} uri URI to generate a slug for.
* @returns Base58-encoded relative path to the root catalog.
*/
const slugify = uri => bs58.encode(Buffer.from(makeRelative(uri)));
const resolve = (href, base = CATALOG_URL) => new URL(href, base).toString();
function decode(s) {
try {
return resolve(bs58.decode(s).toString());
} catch (err) {
console.warn(err);
return CATALOG_URL;
}
}
const main = async () => {
let persistedState = {};
const renderedState = document.querySelector(
"script.state[type='application/json']"
);
if (renderedState != null) {
try {
persistedState = JSON.parse(renderedState.text);
} catch (err) {
console.warn("Unable to parse rendered state:", err);
}
}
const collectionValidator = async (data) => {
const stacVersion = data.stac_version || STAC_VERSION;
let validateCollection = await fetchSchemaValidator("collection", stacVersion);
if (!validateCollection(data)) {
return validateCollection.errors.slice();
}
return null;
};
const catalogValidator = async (data) => {
if (data.license != null || data.extent != null) {
// contains Collection properties
return collectionValidator(data);
}
const stacVersion = data.stac_version || STAC_VERSION;
let validateCatalog = await fetchSchemaValidator("catalog", stacVersion);
if (!validateCatalog(data)) {
return validateCatalog.errors.slice();
}
return null;
};
const itemValidator = async (data) => {
const stacVersion = data.stac_version || STAC_VERSION;
let validateItem = await fetchSchemaValidator("item", stacVersion);
if (!validateItem(data)) {
return validateItem.errors.slice();
}
return null;
};
const routes = [
{
path: "/item/:path*",
component: Item,
props: route => {
let ancestors = [CATALOG_URL];
if (route.params.path != null) {
ancestors = ancestors.concat(
route.params.path.split("/").map(decode)
);
}
let center = null;
if (route.hash != "") {
center = route.hash.slice(1).split("/");
}
return {
ancestors,
center,
path: route.path,
resolve,
slugify,
url: ancestors.slice(-1).pop(),
validate: itemValidator
};
}
},
{
path: "/collection/:path*",
component: Catalog,
props: route => {
let ancestors = [CATALOG_URL];
if (route.params.path != null) {
ancestors = ancestors.concat(
route.params.path.split("/").map(decode)
);
}
return {
ancestors,
path: route.path,
resolve,
slugify,
url: ancestors.slice(-1).pop(),
validate: collectionValidator
};
}
},
{
path: "/:path*",
component: Catalog,
props: route => {
let ancestors = [CATALOG_URL];
if (route.params.path != null) {
ancestors = ancestors.concat(
route.params.path.split("/").map(decode)
);
}
return {
ancestors,
path: route.path,
resolve,
slugify,
url: ancestors.slice(-1).pop(),
validate: catalogValidator
};
}
}
];
const store = new Vuex.Store({
state: {
entities: {},
loading: {}
},
getters: {
getEntity: state => uri => state.entities[uri]
},
mutations: {
FAILED(state, { err, url }) {
state.entities = {
...state.entities,
[url]: err
};
state.loading = {
...state.loading,
[url]: false
};
},
LOADING(state, url) {
state.loading = {
...state.loading,
[url]: true
};
},
LOADED(state, { entity, url }) {
state.entities = {
...state.entities,
[url]: entity
};
state.loading = {
...state.loading,
[url]: false
};
}
},
actions: {
async load({ commit, state }, url) {
if (state.entities[url] != null || state.loading[url] === true) {
// already loading / loaded
return;
}
commit("LOADING", url);
try {
const rsp = await fetchUri(url);
if (rsp.ok) {
const entity = await rsp.json();
commit("LOADED", { entity, url });
} else {
commit("FAILED", { err: new Error(await rsp.text()), url });
}
} catch (err) {
console.warn(err);
commit("FAILED", { err, url });
}
}
},
strict: process.env.NODE_ENV !== "production"
});
const router = new VueRouter({
base: process.env.PATH_PREFIX || "/",
mode: process.env.HISTORY_MODE || "history",
routes
});
window.router = router;
await store.dispatch("load", CATALOG_URL);
router.beforeEach(async (to, from, next) => {
if (from.path === to.path) {
return next();
}
if (
persistedState.path != null &&
persistedState.path !== to.path.replace(/\/$/, "") &&
persistedState.path.toLowerCase() ===
to.path.toLowerCase().replace(/\/$/, "")
) {
return next(persistedState.path);
}
if (to.params.path != null) {
// pre-load all known entities
const urls = to.params.path
.split("/")
.reverse()
.map(decode);
await pMap(urls, store.dispatch.bind(store, "load"), {
concurrency: 10
});
}
return next();
});
// initial load
let el = document.getElementById("app");
// replace existing content
if (document.getElementById("rendered") != null) {
el = document.getElementById("rendered");
}
new Vue({
el,
router,
store,
template: `<router-view id="rendered" />`
});
};
main();