From 44f5a1135227ce81cf5d257dedd4f3d1f009227d Mon Sep 17 00:00:00 2001
From: Mitra Ardron <mitra@mitra.biz>
Date: Mon, 2 Sep 2019 06:27:22 +1000
Subject: [PATCH] Build the naming into Transports (so can remove need for
 objects-bundle)

---
 Naming.js     | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Transports.js |  3 +-
 2 files changed, 96 insertions(+), 1 deletion(-)
 create mode 100644 Naming.js

diff --git a/Naming.js b/Naming.js
new file mode 100644
index 0000000..96b5981
--- /dev/null
+++ b/Naming.js
@@ -0,0 +1,94 @@
+const debug = require('debug')('dweb-transports:naming');
+
+const domains = {
+  arc: {
+    "archive.org": {
+      ".": ["https://dweb.me/archive/archive.html"],
+      "about": ["https://archive.org/about/"],
+      "details": ["https://dweb.me/archive/archive.html?item="],
+      "examples": ["https://dweb.me/archive/examples/"],
+      "images": ["https://dweb.me/archive/images/"],
+      "serve": ["https://dweb.archive.org/download/"],
+      "metadata": [
+        "wolk://dweb.archive.org/metadata/",
+        "gun:/gun/arc/archive.org/metadata/",
+        "https://dweb.me/arc/archive.org/metadata/"],
+      "search.php": ["https://dweb.me/archive/archive.html?query="],
+      "search": ["https://dweb.me/archive/archive.html?query="],
+    },
+  },
+  ipfs: [ "http://ipfs.io/ipfs/", "https://dweb.me/ipfs/"],
+}
+
+
+function expand(partialUrl, remainder) {
+  return partialUrl.endsWith("html")
+  ? [partialUrl, remainder.join('/')] // THis might always be an error.
+  : partialUrl.endsWith("=")
+  ? partialUrl + remainder.join('/')
+  : (partialUrl.endsWith("/"))
+  ? partialUrl+remainder.join('/')
+  : undefined;
+}
+function resolve(parent, table, path) {
+  /**
+   * parent = STRING "a/b/c" path matched so far
+   * table = { key: url || [url]}
+   * path = "d/e/f"
+   * returns [ url || [url,remainder]] || undefined
+   */
+  //debug("Resolving %o in %s", path, parent);
+  const remainder = Array.isArray(path) ? path : path.split('/');
+  const name = remainder.shift();
+  const found = table[name] || table["."]
+  if (found) {
+    if (Array.isArray(found)) {
+      return (found.map(partialUrl => expand(partialUrl, remainder)).filter(url => !!url)); // [url || [url, remainder]]
+    } else if (typeof found === "object") {
+      return resolve([parent, name].join('/'), found, remainder);
+    } else if (typeof found === "string") {
+      return [ expand(found, remainder) ]
+    }
+  } else {
+    debug("WARNING unable to resolve %s in %s", name, parent.join('/') || '/' )
+    return undefined; // Remainder not found
+  }
+}
+
+function resolveName(url) {
+  return url.startsWith("dweb:/") ? resolve([], domains, url.slice(6)) : url; //
+}
+function naming(names) {
+    return [].concat(...names.map(n => resolveName(n)))
+}
+async function p_namingcb(names) {
+  return new Promise((resolve, reject) => { try { const res = naming(names); resolve(res); } catch(err) {reject(err)}}); // Promisify pattern v2b (no CB)
+}
+
+/*
+//TODO find in DM where its catching http://dweb.me and heading back to http://localhost:4244
+const testdata = {
+  "dweb:/arc/archive.org/metadata/foo": [
+    "https://dweb.me/arc/archive.org/metadata/foo",
+    "gun:/gun/arc/archive.org/metadata/foo",
+    "wolk://dweb.archive.org/metadata/foo" ],
+  "dweb:/arc/archive.org/details/foo": [
+    "https://dweb.me/archive/archive.html?item=foo"],
+}
+
+function test() {
+  Object.entries(testdata).forEach(kv => {
+    const res = resolveName(kv[0]);
+    if ((!res
+      || res.length !== kv[1].length)
+      || res.some(r => !kv[1].includes(r))) {
+    debug("%s => %s expect %s", kv[0], res, kv[1]);
+  }});
+  p_namingcb(["dweb:/arc/archive.org/details/foo","foo://bar.baz"])
+  .then(res => debug("Got %o", res))
+  .catch(err => debug("Fail %o", err.message));
+}
+test();
+*/
+
+exports = module.exports = {p_namingcb};
diff --git a/Transports.js b/Transports.js
index 2ff5faa..249b0b3 100644
--- a/Transports.js
+++ b/Transports.js
@@ -5,6 +5,7 @@ const debug = require('debug')('dweb-transports');
 const httptools = require('./httptools');
 const each = require('async/each');
 const map = require('async/map');
+const {p_namingcb} = require('./Naming.js')
 
 class Transports {
     /*
@@ -855,7 +856,7 @@ class Transports {
     }
 }
 Transports._transports = [];    // Array of transport instances connected
-Transports.namingcb = undefined;    // Will be defined by the naming component (turns URLs for names into URLs for transport)
+Transports.namingcb = p_namingcb;    // Will be defined by the naming component (turns URLs for names into URLs for transport)
 Transports._transportclasses = {};  // Pointers to classes whose code is loaded.
 Transports.httptools = httptools;   // Static http tools
 exports = module.exports = Transports;