From fbbc5ad93188e71e337ad6d2587b284be4e96756 Mon Sep 17 00:00:00 2001
From: stuebinm
Date: Mon, 5 Apr 2021 00:37:53 +0200
Subject: load survey from (and submit result to) path given as fragment

syntax: http(s)://domain.tld/path/to/file/index.html#[upload url]

The upload url may be relative to the site's position, or absolute.
Survey results will be POSTed to [upload path]/upload.
---
 site/index.html | 48 ++++++++++++++++++++++++++++++------------------
 1 file changed, 30 insertions(+), 18 deletions(-)

diff --git a/site/index.html b/site/index.html
index 7fef9e9..1378bdf 100644
--- a/site/index.html
+++ b/site/index.html
@@ -21,6 +21,7 @@
      /// polymorphism which would otherwise be hard to get in javascript.
 
      let root = document.getElementById("root");
+     let surveyUrl = window.location.hash.slice(1);
 
      // appends multiple children to an element. returns the root
      // element to be composable
@@ -151,8 +152,7 @@
                  { type: 'application/octet-stream' }
              );
 
-             // TODO!
-             fetch(`http://localhost:8000/upload`, {method:"POST", body:blobData})
+             fetch("/upload", {method:"POST", body:blobData})
                 .then(response => console.log(response.text()))
 
          }
@@ -206,27 +206,39 @@
          // initialise the web assembly parts of this
          await init();
          const Http = new XMLHttpRequest();
-         const url="http://127.0.0.1:8000/pubcrypt.age";
+         const url=  surveyUrl;
          Http.open("GET", url);
          Http.responseType = "arraybuffer";
          Http.send();
 
          Http.onreadystatechange = (e) => {
-             if (Http.readyState == 4 && Http.status == 200) {
-                 let bytearray = new Uint8Array (Http.response);
-                 let string = String.fromCharCode.apply(null, bytearray);
-                 let survey = null;
-                 try {
-                     survey = JSON.parse(string);
-                 } catch (e) {
-                     console.log ("survey appears to be encrypted");
-                     askPassphrase(bytearray);
-                 }
-                 /// if the survey was unencrypted, start it here. If it
-                 /// was encrypted, we need to wait for user action via
-                 /// a js callback (handled in askPassphrase).
-                 if (survey !== null) {
-                     mkSurvey(survey);
+             if (Http.readyState == 4) {
+                 if (Http.status == 200) {
+                     let bytearray = new Uint8Array (Http.response);
+                     let string = String.fromCharCode.apply(null, bytearray);
+                     let survey = null;
+                     try {
+                         survey = JSON.parse(string);
+                     } catch (e) {
+                         console.log ("survey appears to be encrypted");
+                         askPassphrase(bytearray);
+                     }
+                     /// if the survey was unencrypted, start it here. If it
+                     /// was encrypted, we need to wait for user action via
+                     /// a js callback (handled in askPassphrase).
+                     if (survey !== null) {
+                         mkSurvey(survey);
+                     }
+                 // couldn't load survey json, show error message
+                 } else {
+                     appendChildren(root, [
+                         mkElement("h1", "Error"),
+                         mkElement("p", "Could not load this survey; are you sure that it exists?"),
+                         appendChildren(
+                             mkElement("p","attempted path: "),
+                             [mkElement("tt", surveyUrl)]
+                         )
+                     ]);
                  }
              }
          }
-- 
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