1 files changed, 94 insertions, 0 deletions
diff --git a/node_modules/koa-mount/index.js b/node_modules/koa-mount/index.js
new file mode 100644
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+++ b/node_modules/koa-mount/index.js
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+
+/**
+ * Module dependencies.
+ */
+
+const debug = require('debug')('koa-mount');
+const compose = require('koa-compose');
+const assert = require('assert');
+
+/**
+ * Expose `mount()`.
+ */
+
+module.exports = mount;
+
+/**
+ * Mount `app` with `prefix`, `app`
+ * may be a Koa application or
+ * middleware function.
+ *
+ * @param {String|Application|Function} prefix, app, or function
+ * @param {Application|Function} [app or function]
+ * @return {Function}
+ * @api public
+ */
+
+function mount(prefix, app) {
+  if ('string' != typeof prefix) {
+    app = prefix;
+    prefix = '/';
+  }
+
+  assert('/' == prefix[0], 'mount path must begin with "/"');
+
+  // compose
+  const downstream = app.middleware
+    ? compose(app.middleware)
+    : app;
+
+  // don't need to do mounting here
+  if ('/' == prefix) return downstream;
+
+  const trailingSlash = '/' == prefix.slice(-1);
+
+  const name = app.name || 'unnamed';
+  debug('mount %s %s', prefix, name);
+
+  return async function (ctx, upstream){
+    const prev = ctx.path;
+    const newPath = match(prev);
+    debug('mount %s %s -> %s', prefix, name, newPath);
+    if (!newPath) return await upstream();
+
+    ctx.mountPath = prefix;
+    ctx.path = newPath;
+    debug('enter %s -> %s', prev, ctx.path);
+
+    await downstream(ctx, async () => {
+      ctx.path = prev;
+      await upstream();
+      ctx.path = newPath;
+    });
+
+    debug('leave %s -> %s', prev, ctx.path);
+    ctx.path = prev;
+  };
+
+  /**
+   * Check if `prefix` satisfies a `path`.
+   * Returns the new path.
+   *
+   * match('/images/', '/lkajsldkjf') => false
+   * match('/images', '/images') => /
+   * match('/images/', '/images') => false
+   * match('/images/', '/images/asdf') => /asdf
+   *
+   * @param {String} prefix
+   * @param {String} path
+   * @return {String|Boolean}
+   * @api private
+   */
+
+  function match(path) {
+    // does not match prefix at all
+    if (0 != path.indexOf(prefix)) return false;
+
+    const newPath = path.replace(prefix, '') || '/';
+    if (trailingSlash) return newPath;
+
+    // `/mount` does not match `/mountlkjalskjdf`
+    if ('/' != newPath[0]) return false;
+    return newPath;
+  }
+}