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366<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import * as check from './fs/types/check'
367import * as debug from './common/debug'
368import * as did from './did'
369import * as dns from './dns'
370import * as ucan from './ucan'
371import { CID } from './ipfs'
372import { api } from './common'
373import { Ucan } from './ucan'
374import { setup } from './setup/internal'
375&nbsp;
376/**
377 * CID representing an empty string. We use to to speed up DNS propagation
378 * However, we treat that as a null value in the code
379 */
380const EMPTY_CID = <span class="cstat-no" title="statement not covered" >'Qmc5m94Gu7z62RC8waSKkZUrCCBJPyHbkpmGzEePxy2oXJ'</span>
381&nbsp;
382/**
383 * Get the CID of a user's data root.
384 * First check Fission server, then check DNS
385 *
386 * @param username The username of the user that we want to get the data root of.
387 */
388export async function <span class="fstat-no" title="function not covered" >lookup(</span>
389 username: string
390): Promise&lt;CID | null&gt; {
391 const maybeRoot = <span class="cstat-no" title="statement not covered" >await lookupOnFisson(username)</span>
392<span class="cstat-no" title="statement not covered" > if(maybeRoot === EMPTY_CID) <span class="cstat-no" title="statement not covered" >return null</span></span>
393<span class="cstat-no" title="statement not covered" > if(maybeRoot !== null) <span class="cstat-no" title="statement not covered" >return maybeRoot</span></span>
394&nbsp;
395<span class="cstat-no" title="statement not covered" > try {</span>
396 const cid = <span class="cstat-no" title="statement not covered" >await dns.lookupDnsLink(username + '.files.' + setup.endpoints.user)</span>
397<span class="cstat-no" title="statement not covered" > return cid === EMPTY_CID ? null : cid</span>
398 } catch(err) {
399<span class="cstat-no" title="statement not covered" > console.error(err)</span>
400<span class="cstat-no" title="statement not covered" > throw new Error('Could not locate user root in dns')</span>
401 }
402}
403&nbsp;
404/**
405 * Get the CID of a user's data root from the Fission server.
406 *
407 * @param username The username of the user that we want to get the data root of.
408 */
409export async function <span class="fstat-no" title="function not covered" >lookupOnFisson(</span>
410 username: string
411): Promise&lt;CID | null&gt; {
412<span class="cstat-no" title="statement not covered" > try {</span>
413 const resp = <span class="cstat-no" title="statement not covered" >await fetch(</span>
414 `${setup.endpoints.api}/user/data/${username}`,
415 { cache: 'reload' } // don't use cache
416 )
417 const cid = <span class="cstat-no" title="statement not covered" >await resp.json()</span>
418<span class="cstat-no" title="statement not covered" > if (!check.isCID(cid)) {</span>
419<span class="cstat-no" title="statement not covered" > throw new Error("Did not receive a CID")</span>
420 }
421<span class="cstat-no" title="statement not covered" > return cid</span>
422&nbsp;
423 } catch(err) {
424<span class="cstat-no" title="statement not covered" > debug.log('Could not locate user root on Fission server: ', err.toString())</span>
425<span class="cstat-no" title="statement not covered" > return null</span>
426&nbsp;
427 }
428}
429&nbsp;
430/**
431 * Update a user's data root.
432 *
433 * @param cid The CID of the data root.
434 * @param proof The proof to use in the UCAN sent to the API.
435 */
436export async function <span class="fstat-no" title="function not covered" >update(</span>
437 cid: CID | string,
438 proof: Ucan
439): Promise&lt;{ success: boolean }&gt; {
440 const apiEndpoint = <span class="cstat-no" title="statement not covered" >setup.endpoints.api</span>
441&nbsp;
442 // Debug
443<span class="cstat-no" title="statement not covered" > debug.log("🌊 Updating your DNSLink:", cid)</span>
444&nbsp;
445 // Make API call
446<span class="cstat-no" title="statement not covered" > return await fetchWithRetry(`${apiEndpoint}/user/data/${cid}`, {</span>
447 headers: <span class="fstat-no" title="function not covered" >as</span>ync () =&gt; {
448 const jwt = <span class="cstat-no" title="statement not covered" >ucan.encode(await ucan.build({</span>
449 audience: await api.did(),
450 issuer: await did.ucan(),
451 potency: "APPEND",
452 proof,
453&nbsp;
454 // TODO: Waiting on API change.
455 // Should be `username.fission.name/*`
456 resource: proof.payload.rsc
457 }))
458&nbsp;
459<span class="cstat-no" title="statement not covered" > return { 'authorization': `Bearer ${jwt}` }</span>
460 },
461 retries: 100,
462 retryDelay: 5000,
463 retryOn: [ 502, 503, 504 ],
464&nbsp;
465 }, {
466 method: 'PATCH'
467&nbsp;
468 }).then(<span class="fstat-no" title="function not covered" >(r</span>esponse: Response) =&gt; {
469<span class="cstat-no" title="statement not covered" > if (response.status &lt; 300) <span class="cstat-no" title="statement not covered" >debug.log("🪴 DNSLink updated:", cid)</span></span>
470 else <span class="cstat-no" title="statement not covered" >debug.log("🔥 Failed to update DNSLink for:", cid)</span>
471<span class="cstat-no" title="statement not covered" > return { success: response.status &lt; 300 }</span>
472&nbsp;
473 }).catch(<span class="fstat-no" title="function not covered" >er</span>r =&gt; {
474<span class="cstat-no" title="statement not covered" > debug.log("🔥 Failed to update DNSLink for:", cid)</span>
475<span class="cstat-no" title="statement not covered" > console.error(err)</span>
476<span class="cstat-no" title="statement not covered" > return { success: false }</span>
477&nbsp;
478 })
479}
480&nbsp;
481&nbsp;
482&nbsp;
483// ㊙️
484&nbsp;
485&nbsp;
486type RetryOptions = {
487 headers: () =&gt; Promise&lt;{ [_: string]: string }&gt;
488 retries: number
489 retryDelay: number
490 retryOn: Array&lt;number&gt;
491}
492&nbsp;
493&nbsp;
494async function <span class="fstat-no" title="function not covered" >fetchWithRetry(</span>
495 url: string,
496 retryOptions: RetryOptions,
497 fetchOptions: RequestInit,
498 retry: number = <span class="branch-0 cbranch-no" title="branch not covered" >0</span>
499): Promise&lt;Response&gt; {
500 const headers = <span class="cstat-no" title="statement not covered" >await retryOptions.headers()</span>
501 const response = <span class="cstat-no" title="statement not covered" >await fetch(url, {</span>
502 ...fetchOptions,
503 headers: { ...fetchOptions.headers, ...headers }
504 })
505&nbsp;
506<span class="cstat-no" title="statement not covered" > if (retryOptions.retryOn.includes(response.status)) {</span>
507<span class="cstat-no" title="statement not covered" > if (retry &lt; retryOptions.retries) {</span>
508<span class="cstat-no" title="statement not covered" > return await new Promise(<span class="fstat-no" title="function not covered" >(r</span>esolve, reject) =&gt; <span class="cstat-no" title="statement not covered" >setTimeout(</span></span>
509<span class="fstat-no" title="function not covered" > ()</span> =&gt; <span class="cstat-no" title="statement not covered" >fetchWithRetry(url, retryOptions, fetchOptions, retry + 1).then(resolve, reject),</span>
510 retryOptions.retryDelay
511 ))
512 } else {
513<span class="cstat-no" title="statement not covered" > throw new Error("Too many retries for fetch")</span>
514 }
515 }
516&nbsp;
517<span class="cstat-no" title="statement not covered" > return response</span>
518}
519&nbsp;</pre></td></tr></table></pre>
520
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524 Code coverage generated by
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526 at Fri Mar 12 2021 16:29:42 GMT+0100 (Central European Standard Time)
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