From 6d313a4d45703cda00abb79aa04719928a0df3d6 Mon Sep 17 00:00:00 2001
From: Alexis Sellier <self@cloudhead.io>
Date: Tue, 8 Jun 2021 18:02:01 +0200
Subject: [PATCH] Implement project browsing

---
 public/index.css                     |   6 ++
 public/typography.css                |   2 +-
 snowpack.config.js                   |   2 +
 src/App.svelte                       |   2 +
 src/Header.svelte                    |   2 +-
 src/base/orgs/Org.ts                 |   3 +-
 src/base/projects/Blob.svelte        |  89 +++++++++++++++++
 src/base/projects/Project.ts         |  35 -------
 src/base/projects/Routes.svelte      |  19 ++++
 src/base/projects/Tree.svelte        |  37 +++++++
 src/base/projects/Tree/File.svelte   |  55 +++++++++++
 src/base/projects/Tree/Folder.svelte |  89 +++++++++++++++++
 src/base/projects/View.svelte        | 143 +++++++++++++++++++++++++++
 src/base/projects/Widget.svelte      |  10 +-
 src/config.json                      |   3 -
 src/config.ts                        |  10 +-
 src/project.ts                       | 140 ++++++++++++++++++++++++++
 17 files changed, 596 insertions(+), 51 deletions(-)
 create mode 100644 src/base/projects/Blob.svelte
 delete mode 100644 src/base/projects/Project.ts
 create mode 100644 src/base/projects/Routes.svelte
 create mode 100644 src/base/projects/Tree.svelte
 create mode 100644 src/base/projects/Tree/File.svelte
 create mode 100644 src/base/projects/Tree/Folder.svelte
 create mode 100644 src/base/projects/View.svelte
 create mode 100644 src/project.ts

diff --git a/public/index.css b/public/index.css
index d8aeb90eb..ef86f18c5 100644
--- a/public/index.css
+++ b/public/index.css
@@ -19,10 +19,12 @@
 	--color-secondary-2: #2c326d;
 	--color-secondary-6: #e3e3ff;
 	--color-tertiary: #55ffff;
+	--color-tertiary-faded: #ade4e4;
 	--color-tertiary-background: #55ffff11;
 	--color-tertiary-1: #214047;
 	--color-tertiary-2: #2c326d;
 	--color-tertiary-6: #e3e3ff;
+	--color-light: #add0e4;
 	--color-yellow: #ffff99;
 	--color-yellow-background: #ffff9911;
 	--color-positive: #53db53;
@@ -39,7 +41,9 @@
 	--color-negative-2: #623237;
 	--color-negative-6: #ffd4d4;
 	--color-foreground: #ffffff;
+	--color-foreground-90: #dddddd;
 	--color-foreground-faded: #777788;
+	--color-foreground-subtle: #444455;
 	--color-foreground-background: #77778811;
 	--color-foreground-1: #242e38;
 	--color-foreground-2: #29343d;
@@ -52,6 +56,8 @@
 	--color-glow-error: #ff555522;
 
 	--font-family-sans-serif: Inter, sans-serif;
+	--font-weight-medium: 600;
+	--font-weight-bold: 700;
 	--font-family-monospace: monospace;
 	--border-radius: 50px;
 	--box-shadow-color: var(--color-secondary-2);
diff --git a/public/typography.css b/public/typography.css
index 6f13040b2..4d9687edc 100644
--- a/public/typography.css
+++ b/public/typography.css
@@ -16,7 +16,7 @@
 
 @font-face {
 	font-family: "Inter";
-	font-style: bold;
+	font-style: bolder;
 	font-weight: 700;
 	font-display: swap;
 	src: url("fonts/Inter-Bold.otf");
diff --git a/snowpack.config.js b/snowpack.config.js
index 8f16a88e6..b21aff64d 100644
--- a/snowpack.config.js
+++ b/snowpack.config.js
@@ -2,6 +2,7 @@
 module.exports = {
   env: {
     RADICLE_ALCHEMY_API_KEY: process.env.RADICLE_ALCHEMY_API_KEY,
+    RADICLE_HTTP_API: process.env.RADICLE_HTTP_API,
   },
   mount: {
     public: '/',
@@ -17,6 +18,7 @@ module.exports = {
   routes: [
     /* Enable an SPA Fallback in development: */
     {"match": "routes", "src": ".*", "dest": "/index.html"},
+    {"match": "all", "src": "/projects/.*", "dest": "/index.html"},
   ],
   optimize: {
     /* Setting `bundle: true` breaks .json imports in snowpack 3.5.0 */
diff --git a/src/App.svelte b/src/App.svelte
index a28cd282b..5339f3722 100644
--- a/src/App.svelte
+++ b/src/App.svelte
@@ -7,6 +7,7 @@
   import Vesting from '@app/base/vesting/Index.svelte';
   import Registrations from '@app/base/registrations/Routes.svelte';
   import Orgs from '@app/base/orgs/Routes.svelte';
+  import Projects from '@app/base/projects/Routes.svelte';
   import Resolver from '@app/base/resolver/Routes.svelte';
   import Header from '@app/Header.svelte';
   import Loading from '@app/Loading.svelte';
@@ -55,6 +56,7 @@
         </Route>
         <Registrations {config} session={$session} />
         <Orgs {config} />
+        <Projects {config} />
         <Resolver {config} />
       </Router>
     </div>
diff --git a/src/Header.svelte b/src/Header.svelte
index c7acb5843..64de2dbc9 100644
--- a/src/Header.svelte
+++ b/src/Header.svelte
@@ -135,7 +135,7 @@
       <span class="network unavailable">No Network</span>
     {/if}
 
-    {#if address}
+    {#if address && tokenBalance}
       <span class="balance">
         {formatBalance(tokenBalance)} <strong>RAD</strong>
       </span>
diff --git a/src/base/orgs/Org.ts b/src/base/orgs/Org.ts
index 96dd46a06..daff189a6 100644
--- a/src/base/orgs/Org.ts
+++ b/src/base/orgs/Org.ts
@@ -4,7 +4,7 @@ import type { ContractReceipt } from '@ethersproject/contracts';
 import { assert } from '@app/error';
 import * as utils from '@app/utils';
 import type { Config } from '@app/config';
-import type { Project } from '@app/base/projects/Project';
+import type { Project } from '@app/project';
 
 const GetProjects = `
   query GetProjects($org: ID!) {
@@ -13,6 +13,7 @@ const GetProjects = `
       anchor {
         stateHash
         stateHashFormat
+        timestamp
       }
     }
   }
diff --git a/src/base/projects/Blob.svelte b/src/base/projects/Blob.svelte
new file mode 100644
index 000000000..8fe27ef2a
--- /dev/null
+++ b/src/base/projects/Blob.svelte
@@ -0,0 +1,89 @@
+<script lang="typescript">
+  import type { Blob } from "@app/project";
+
+  export let blob: Blob;
+
+  const lines = (blob.content.match(/\n/g) || []).length;
+  const lineNumbers = Array(lines).fill(0).map((_, index) => (index + 1).toString());
+</script>
+
+<style>
+  .file-source {
+    border: 1px solid var(--color-foreground-level-3);
+    border-radius: 0.5rem;
+    min-width: var(--content-min-width);
+  }
+
+  header .file-header {
+    display: flex;
+    height: 3rem;
+    align-items: center;
+    padding: 0 1rem;
+    color: var(--color-foreground);
+    border-width: 1px 1px 0 1px;
+    border-color: var(--color-foreground-subtle);
+    border-style: solid;
+    border-top-left-radius: 0.25rem;
+    border-top-right-radius: 0.25rem;
+  }
+
+  header .file-name {
+    font-weight: normal;
+  }
+
+  .line-numbers {
+    color: var(--color-foreground-subtle);
+    font-family: var(--font-family-sans-serif);
+    text-align: right;
+    user-select: none;
+    padding: 0 1rem 0.5rem 1rem;
+  }
+
+  .code {
+    padding-bottom: 0.5rem;
+    overflow-x: auto;
+  }
+
+  .container {
+    display: flex;
+    border: 1px solid var(--color-foreground-subtle);
+    border-top-style: dashed;
+  }
+
+  .no-scrollbar {
+    scrollbar-width: none;
+  }
+
+  .no-scrollbar::-webkit-scrollbar {
+    display: none;
+  }
+</style>
+
+<div>
+  <div class="file-source">
+    <header>
+      <div class="file-header" data-cy="file-header">
+        <span class="file-name">
+          <span>{blob.path.split("/").join(" / ")}</span>
+        </span>
+      </div>
+    </header>
+    <div class="container">
+      {#if blob.binary}
+        👀 Binary content
+      {:else}
+        <pre class="line-numbers">
+          {@html lineNumbers.join("\n")}
+        </pre>
+        <pre
+          class="code no-scrollbar">
+          {#if blob.html}
+            {@html blob.content}
+          {:else}
+            {blob.content}
+          {/if}
+        </pre>
+      {/if}
+    </div>
+  </div>
+</div>
diff --git a/src/base/projects/Project.ts b/src/base/projects/Project.ts
deleted file mode 100644
index 03ed14fa6..000000000
--- a/src/base/projects/Project.ts
+++ /dev/null
@@ -1,35 +0,0 @@
-import type { Config } from '@app/config';
-
-export interface Project {
-  id: string
-  anchor: {
-    stateHash: string
-    stateHashFormat: string
-  }
-}
-
-export interface User {
-  urn: string
-  avatar: { emoji: string, background: { r: number, g: number, b: number } }
-}
-
-export interface Meta {
-  name: string
-  description: string
-  maintainers: User[]
-}
-
-export async function getMetadata(urn: string, config: Config): Promise<Meta | null> {
-  const response = await fetch(`${config.seed.url}/projects/${urn}`, {
-    method: 'GET',
-    headers: {
-      'Accept': 'application/json',
-    }
-  });
-
-  if (! response.ok) {
-    return null;
-  }
-
-  return await response.json();
-}
diff --git a/src/base/projects/Routes.svelte b/src/base/projects/Routes.svelte
new file mode 100644
index 000000000..29999a8f2
--- /dev/null
+++ b/src/base/projects/Routes.svelte
@@ -0,0 +1,19 @@
+<script lang="typescript">
+  import { Route } from "svelte-routing";
+  import View from '@app/base/projects/View.svelte';
+  import type { Config } from '@app/config';
+
+  export let config: Config;
+
+  const joinPaths = (path: string, glob: string): string => {
+    return glob.length > 0 ? [path, glob].join("/") : path;
+  };
+</script>
+
+<Route path="/projects/:urn/:commit/:path/*" let:params>
+  <View {config} urn={params.urn} commit={params.commit} path={joinPaths(params.path, params['*'])} />
+</Route>
+
+<Route path="/projects/:urn/:commit" let:params>
+  <View {config} urn={params.urn} commit={params.commit} path="/" />
+</Route>
diff --git a/src/base/projects/Tree.svelte b/src/base/projects/Tree.svelte
new file mode 100644
index 000000000..f63125deb
--- /dev/null
+++ b/src/base/projects/Tree.svelte
@@ -0,0 +1,37 @@
+<script lang="typescript">
+  import { createEventDispatcher } from "svelte";
+
+  import type { Tree } from "@app/project";
+  import { ObjectType } from "@app/project";
+
+  import File from './Tree/File.svelte';
+  import Folder from './Tree/Folder.svelte';
+
+  export let fetchTree: (path: string) => Promise<Tree>;
+  export let path: string;
+  export let tree: Tree;
+
+  const dispatch = createEventDispatcher();
+  const onSelect = ({ detail: path }: { detail: string }): void => {
+    dispatch("select", path);
+  };
+</script>
+
+{#each tree.entries as entry (entry.path)}
+  {#if entry.info.objectType === ObjectType.Tree}
+    <Folder
+      {fetchTree}
+      name={entry.info.name}
+      prefix={`${entry.path}/`}
+      currentPath={path}
+      on:select={onSelect}
+    />
+  {:else}
+    <File
+      active={entry.path === path}
+      loading={false}
+      name={entry.info.name}
+      on:click={() => onSelect({ detail: entry.path })}
+    />
+  {/if}
+{/each}
diff --git a/src/base/projects/Tree/File.svelte b/src/base/projects/Tree/File.svelte
new file mode 100644
index 000000000..ed910afaf
--- /dev/null
+++ b/src/base/projects/Tree/File.svelte
@@ -0,0 +1,55 @@
+<script lang="typescript">
+  import Loading from '@app/Loading.svelte';
+
+  export let active: boolean;
+  export let loading: boolean;
+  export let name: string;
+</script>
+
+<style>
+  .file {
+    color: var(--color-foreground-90);
+    border-radius: 0.25rem;
+    cursor: pointer;
+    display: flex;
+    flex: 1;
+    line-height: 1.5em;
+    margin: 0.125rem 0;
+    padding: 0.25rem;
+    width: 100%;
+  }
+
+  .file:hover {
+    background-color: var(--color-foreground-background);
+  }
+
+  .file.active {
+    color: var(--color-foreground) !important;
+    background-color: var(--color-foreground-background);
+  }
+
+  .spinner {
+    align-items: center;
+    display: flex;
+    justify-content: center;
+    height: 24px;
+    width: 24px;
+  }
+
+  .name {
+    margin-left: 0.25rem;
+    user-select: none;
+    white-space: nowrap;
+  }
+</style>
+
+<div class="file" class:active on:click>
+  {#if loading}
+    <div class="spinner">
+      <Loading small />
+    </div>
+  {:else}
+    <!-- Nothing -->
+  {/if}
+  <span class="name">{name}</span>
+</div>
diff --git a/src/base/projects/Tree/Folder.svelte b/src/base/projects/Tree/Folder.svelte
new file mode 100644
index 000000000..4847cc9ca
--- /dev/null
+++ b/src/base/projects/Tree/Folder.svelte
@@ -0,0 +1,89 @@
+<script lang="typescript">
+  import { createEventDispatcher } from "svelte";
+
+  import Loading from '@app/Loading.svelte';
+  import type { Tree } from "@app/project";
+  import { ObjectType } from "@app/project";
+
+  import File from "./File.svelte";
+
+  export let fetchTree: (path: string) => Promise<Tree>;
+  export let name: string;
+  export let prefix: string;
+  export let currentPath: string;
+
+  let expanded = currentPath.indexOf(prefix) === 0;
+  let tree: Promise<Tree> | null = expanded ? fetchTree(prefix) : null;
+
+  const dispatch = createEventDispatcher();
+  const onSelectFile = ({ detail: path }: { detail: string }) =>
+    dispatch("select", path);
+
+  const onClick = () => {
+    expanded = !expanded;
+
+    if (expanded) {
+      tree = fetchTree(prefix);
+    }
+  };
+</script>
+
+<style>
+  .folder {
+    display: flex;
+    cursor: pointer;
+    padding: 0.25rem;
+    margin: 0.125rem 0;
+    color: var(--color-foreground-level-6);
+    user-select: none;
+    line-height: 1.5rem;
+    white-space: nowrap;
+  }
+  .folder:hover {
+    background-color: var(--color-foreground-background);
+    border-radius: 0.25rem;
+  }
+
+  .folder-name {
+    margin-left: 0.25rem;
+    color: var(--color-light);
+  }
+
+  .container {
+    padding-left: 0.5rem;
+    margin: 0;
+  }
+</style>
+
+<div class="folder" on:click={onClick}>
+  <span class="folder-name">{name}/</span>
+</div>
+
+<div class="container">
+  {#if expanded}
+    {#await tree}
+      <Loading small center />
+    {:then tree}
+      {#if tree}
+        {#each tree.entries as entry (entry.path)}
+          {#if entry.info.objectType === ObjectType.Tree}
+            <svelte:self
+              {fetchTree}
+              name={entry.info.name}
+              on:select={onSelectFile}
+              prefix={`${entry.path}/`}
+              {currentPath} />
+          {:else}
+            <File
+              active={entry.path === currentPath}
+              loading={false}
+              name={entry.info.name}
+              on:click={() => {
+                onSelectFile({ detail: entry.path });
+              }} />
+          {/if}
+        {/each}
+      {/if}
+    {/await}
+  {/if}
+</div>
diff --git a/src/base/projects/View.svelte b/src/base/projects/View.svelte
new file mode 100644
index 000000000..edb25128a
--- /dev/null
+++ b/src/base/projects/View.svelte
@@ -0,0 +1,143 @@
+<script lang="typescript">
+  import { onMount } from 'svelte';
+  import { navigate } from 'svelte-routing';
+  import type { Config } from '@app/config';
+  import * as proj from '@app/project';
+  import Loading from '@app/Loading.svelte';
+
+  import Tree from './Tree.svelte';
+  import Blob from './Blob.svelte';
+
+  export let urn: string;
+  export let commit: string;
+  export let config: Config;
+  export let path: string;
+
+  let meta: "loading" | proj.Meta | null = null;
+  let blob: Promise<proj.Blob | null> | null = null;
+
+  const fetchTree = async (path: string) => {
+    return proj.getTree(urn, commit, path, config);
+  };
+
+  const onSelect = async ({ detail: path }: { detail: string }) => {
+    navigate(`/projects/${urn}/${commit}/${path}`);
+  };
+
+  onMount(async () => {
+    meta = "loading";
+    meta = await proj.getMetadata(urn, config);
+  });
+
+  $: if (path === "/") {
+    blob = proj.getReadme(urn, commit, config);
+  } else {
+    blob = proj.getBlob(urn, commit, path, config);
+  }
+</script>
+
+<style>
+  main {
+    width: 100%;
+    padding: 4rem 0;
+  }
+  main > header {
+    margin-bottom: 4rem;
+    padding: 0 8rem;
+  }
+  .title {
+    font-size: 2.25rem;
+    margin-bottom: 0.5rem;
+  }
+
+  .anchor {
+    display: inline-block;
+    font-size: 0.75rem;
+    font-family: var(--font-family-monospace);
+    color: var(--color-secondary);
+    background-color: var(--color-secondary-background);
+    padding: 0.75rem;
+    border-radius: 0.25rem;
+  }
+
+  .urn {
+    font-family: var(--font-family-monospace);
+    font-size: 0.75rem;
+    color: var(--color-foreground-faded);
+  }
+  .description {
+    margin: 1rem 0 1.5rem 0;
+  }
+
+  .center-content {
+    margin: 0 auto;
+    max-width: var(--content-max-width);
+    min-width: var(--content-min-width);
+  }
+
+  .container {
+    display: flex;
+    width: inherit;
+    margin-bottom: 4rem;
+    padding: 0 2rem 0 8rem;
+  }
+
+  .column-left {
+    display: flex;
+    flex-direction: column;
+    padding-right: 1rem;
+  }
+
+  .column-right {
+    display: flex;
+    flex-direction: column;
+    padding-left: 1rem;
+    min-width: var(--content-min-width);
+    width: 100%;
+  }
+
+  .source-tree {
+    overflow-x: auto;
+  }
+</style>
+
+<main>
+  <header>
+    {#if meta === "loading"}
+      <Loading small />
+    {:else if meta}
+      <div class="title bold">{meta.name}</div>
+      <div class="urn">{urn}</div>
+      <div class="description">{meta.description}</div>
+    {/if}
+    <div class="anchor">
+      commit {commit}
+    </div>
+  </header>
+  <div class="container center-content">
+    <div class="column-left">
+      <div class="source-tree">
+        {#await proj.getTree(urn, commit, "/", config)}
+          Loading..
+        {:then tree}
+          <Tree {tree} {path} {fetchTree} on:select={onSelect} />
+        {:catch err}
+          {err}
+        {/await}
+      </div>
+    </div>
+    <div class="column-right">
+      {#await blob}
+        <Loading small center />
+      {:then blob}
+        {#if blob}
+          <Blob {blob} />
+        {:else}
+          <!-- Project has no README -->
+        {/if}
+      {:catch}
+        <!-- TODO: Handle error -->
+      {/await}
+    </div>
+  </div>
+</main>
diff --git a/src/base/projects/Widget.svelte b/src/base/projects/Widget.svelte
index 0c5208e84..620905054 100644
--- a/src/base/projects/Widget.svelte
+++ b/src/base/projects/Widget.svelte
@@ -1,12 +1,10 @@
 <script type="typescript">
   import { onMount } from 'svelte';
   import type { Config } from '@app/config';
+  import * as proj from '@app/project';
   import Loading from '@app/Loading.svelte';
   import Blockies from '@app/Blockies.svelte';
 
-  import { getMetadata } from './Project';
-  import type { Project, Meta } from './Project';
-
   enum Status { Loading, Loaded, Error }
 
   type State =
@@ -14,15 +12,15 @@
     | { status: Status.Loaded }
     | { status: Status.Error, error: string };
 
-  export let project: Project;
+  export let project: proj.Project;
   export let config: Config;
 
   let state: State = { status: Status.Loading };
-  let meta: Meta | null = null;
+  let meta: proj.Meta | null = null;
 
   onMount(async () => {
     try {
-      const result = await getMetadata(project.id, config);
+      const result = await proj.getMetadata(project.id, config);
       state = { status: Status.Loaded };
       meta = result;
     } catch (err) {
diff --git a/src/config.json b/src/config.json
index 89508decb..45fe5e0b9 100644
--- a/src/config.json
+++ b/src/config.json
@@ -58,9 +58,6 @@
     },
     "tokens": []
   },
-  "seed": {
-    "url": "https://sprout.radicle.xyz"
-  },
   "abi": {
     "registrar": [
       "function rad() view returns (address)",
diff --git a/src/config.ts b/src/config.ts
index aa7748c1d..4e14e5370 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -11,6 +11,7 @@ declare global {
   interface ImportMeta {
     env: {
       RADICLE_ALCHEMY_API_KEY: string | null,
+      RADICLE_HTTP_API: string | null,
     }
   }
 }
@@ -24,9 +25,9 @@ export class Config {
   gasLimits: { createOrg: number };
   provider: ethers.providers.JsonRpcProvider;
   signer: ethers.Signer & TypedDataSigner | null;
-  seed: { url: string };
   safe: { api: string | null, viewer: string | null };
   abi: { [contract: string]: string[] }
+  seed: { api: string | null };
   tokens: string[];
 
   constructor(
@@ -34,13 +35,15 @@ export class Config {
     provider: ethers.providers.JsonRpcProvider,
     signer: ethers.Signer & TypedDataSigner | null,
   ) {
-    let cfg = (<Record<string, any>> config)[network.name];
-    
+    const cfg = (<Record<string, any>> config)[network.name];
+    const api = import.meta.env.RADICLE_HTTP_API;
+
     if (!cfg) {
       throw `Network ${network.name} is not supported`;
     }
 
     this.network = network;
+    this.seed = { api };
     this.registrar = cfg.registrar;
     this.radToken = cfg.radToken;
     this.orgFactory = cfg.orgFactory;
@@ -49,7 +52,6 @@ export class Config {
     this.provider = provider;
     this.signer = signer;
     this.gasLimits = gasLimits;
-    this.seed = config.seed;
     this.abi = config.abi;
     this.tokens = cfg.tokens;
   }
diff --git a/src/project.ts b/src/project.ts
new file mode 100644
index 000000000..1be5e6d8c
--- /dev/null
+++ b/src/project.ts
@@ -0,0 +1,140 @@
+import type { Config } from '@app/config';
+
+export interface Project {
+  id: string
+  anchor: {
+    stateHash: string
+    stateHashFormat: string
+  }
+}
+
+export interface Person {
+  urn: string
+  avatar: { emoji: string, background: { r: number, g: number, b: number } }
+}
+
+export interface Meta {
+  name: string
+  description: string
+  maintainers: Person[]
+}
+
+export interface Author {
+  avatar: string;
+  email: string;
+  name: string;
+}
+
+export enum ObjectType {
+  Blob = "BLOB",
+  Tree = "TREE",
+}
+
+export interface CommitHeader {
+  author: Author;
+  committer: Author;
+  committerTime: number;
+  description: string;
+  sha1: string;
+  summary: string;
+}
+
+export interface Info {
+  name: string;
+  objectType: ObjectType;
+  lastCommit: CommitHeader;
+}
+
+export interface Entry {
+  path: string;
+  info: Info;
+}
+
+export interface Blob {
+  binary?: boolean;
+  html?: boolean;
+  content: string;
+  path: string;
+  info: Info;
+}
+
+export interface Tree {
+  entries: Entry[];
+  info: Info;
+  path: string;
+}
+
+export async function getMetadata(urn: string, config: Config): Promise<Meta | null> {
+  const api = import.meta.env.RADICLE_HTTP_API;
+  const response = await fetch(`${api}/v1/projects/${urn}`, {
+    method: 'GET',
+    headers: {
+      'Accept': 'application/json',
+    }
+  });
+
+  if (! response.ok) {
+    return null;
+  }
+
+  return await response.json();
+}
+
+export async function getTree(
+  urn: string,
+  commit: string,
+  path: string,
+  config: Config
+): Promise<any | null> {
+  if (! config.seed.api) return null;
+
+  const response = await fetch(`${config.seed.api}/v1/projects/${urn}/tree/${commit}/${path}`, {
+    method: 'GET',
+    headers: {
+      'Accept': 'application/json',
+    }
+  });
+  if (! response.ok) {
+    return null;
+  }
+  return response.json();
+}
+
+export async function getBlob(
+  urn: string,
+  commit: string,
+  path: string,
+  config: Config
+): Promise<Blob | null> {
+  if (! config.seed.api) return null;
+
+  const response = await fetch(`${config.seed.api}/v1/projects/${urn}/blob/${commit}/${path}`, {
+    method: 'GET',
+    headers: {
+      'Accept': 'application/json',
+    }
+  });
+  if (! response.ok) {
+    return null;
+  }
+  return response.json();
+}
+
+export async function getReadme(
+  urn: string,
+  commit: string,
+  config: Config
+): Promise<Blob | null> {
+  if (! config.seed.api) return null;
+
+  const response = await fetch(`${config.seed.api}/v1/projects/${urn}/readme/${commit}`, {
+    method: 'GET',
+    headers: {
+      'Accept': 'application/json',
+    }
+  });
+  if (! response.ok) {
+    return null;
+  }
+  return response.json();
+}