feat: A whole slew of things

- Use a md5 hash of the session cookie value as key for session validity check
- Introduce global state
- Introduce a common interface for form logic, and implement it on the sign-in form
- Introduce static resolve() on all services instead of new-upping all over.
- Implement /portal on the frontend to support giving the frontend a inital context from server or anywhere.
- Show a notification when users sign in for the first time after validating their email

4 files changed, 113 insertions, 4 deletions

diff --git a/code/app/src/help/cache.ts b/code/app/src/help/cache.ts
new file mode 100644
index 0000000..e253399
--- /dev/null
+++ b/code/app/src/help/cache.ts
@@ -0,0 +1,38 @@
+import { Temporal } from "temporal-polyfill";
+import { log_debug } from "$help/logger";
+
+let cache = {};
+
+export const CacheKeys = {
+    isAuthenticated: "isAuthenticated"
+}
+
+export async function cached_result_async<T>(key: string, staleAfterSeconds: number, get_result: any, forceRefresh: boolean = false) {
+    if (!cache[key]) {
+        cache[key] = {
+            l: 0,
+            c: undefined as T,
+        };
+    }
+    const staleEpoch = ((cache[key]?.l ?? 0) + staleAfterSeconds);
+    const isStale = forceRefresh || (staleEpoch < Temporal.Now.instant().epochSeconds);
+    if (isStale || !cache[key]?.c) {
+        cache[key].c = await get_result();
+        cache[key].l = Temporal.Now.instant().epochSeconds;
+    }
+
+    log_debug("Ran cached_result_async", {
+        cacheKey: key,
+        isStale,
+        cache: cache[key],
+        staleEpoch,
+    });
+
+    return cache[key].c as T;
+}
+
+export function clear_cache(key: string) {
+    if (!key) throw new Error("No key was specified");
+    cache[key].c = undefined;
+    log_debug("Cleared cache with key: " + key);
+}
\ No newline at end of file
diff --git a/code/app/src/help/global-state.ts b/code/app/src/help/global-state.ts
new file mode 100644
index 0000000..a253ae9
--- /dev/null
+++ b/code/app/src/help/global-state.ts
@@ -0,0 +1,22 @@
+import { get } from "svelte/store";
+import { writable_persistent } from "./persistent-store";
+
+const state = writable_persistent<any>({
+    initialState: {},
+    name: "global-state"
+});
+
+export type GlobalStateKeys = "isLoggedIn" | "showEmailValidatedAlertWhenLoggedIn" | "all";
+
+export function fgs(key: GlobalStateKeys): any {
+    const value = get(state);
+    if (key === "all") return value;
+    return value[key];
+}
+
+export function sgs(key: GlobalStateKeys, value: any) {
+    if (key === "all") throw new Error("Not allowed to set global state key: all");
+    const stateValue = get(state);
+    stateValue[key] = JSON.stringify(value)
+    state.set(stateValue);
+}
\ No newline at end of file
diff --git a/code/app/src/help/md5.ts b/code/app/src/help/md5.ts
new file mode 100644
index 0000000..0265194
--- /dev/null
+++ b/code/app/src/help/md5.ts
@@ -0,0 +1,48 @@
+//  A formatted version of a popular md5 implementation.
+//  Original copyright (c) Paul Johnston & Greg Holt.
+//  The function itself is now 42 lines long.
+//  https://stackoverflow.com/a/60467595 "Don't deny."
+
+export function md5(inputString: string): string {
+    const hc = "0123456789abcdef";
+    function rh(n) { var j, s = ""; for (j = 0; j <= 3; j++) s += hc.charAt((n >> (j * 8 + 4)) & 0x0F) + hc.charAt((n >> (j * 8)) & 0x0F); return s; }
+    function ad(x, y) { var l = (x & 0xFFFF) + (y & 0xFFFF); var m = (x >> 16) + (y >> 16) + (l >> 16); return (m << 16) | (l & 0xFFFF); }
+    function rl(n, c) { return (n << c) | (n >>> (32 - c)); }
+    function cm(q, a, b, x, s, t) { return ad(rl(ad(ad(a, q), ad(x, t)), s), b); }
+    function ff(a, b, c, d, x, s, t) { return cm((b & c) | ((~b) & d), a, b, x, s, t); }
+    function gg(a, b, c, d, x, s, t) { return cm((b & d) | (c & (~d)), a, b, x, s, t); }
+    function hh(a, b, c, d, x, s, t) { return cm(b ^ c ^ d, a, b, x, s, t); }
+    function ii(a, b, c, d, x, s, t) { return cm(c ^ (b | (~d)), a, b, x, s, t); }
+    function sb(x) {
+        var i; var nblk = ((x.length + 8) >> 6) + 1; var blks = new Array(nblk * 16); for (i = 0; i < nblk * 16; i++) blks[i] = 0;
+        for (i = 0; i < x.length; i++) blks[i >> 2] |= x.charCodeAt(i) << ((i % 4) * 8);
+        blks[i >> 2] |= 0x80 << ((i % 4) * 8); blks[nblk * 16 - 2] = x.length * 8; return blks;
+    }
+    var i, x = sb(inputString), a = 1732584193, b = -271733879, c = -1732584194, d = 271733878, olda, oldb, oldc, oldd;
+    for (i = 0; i < x.length; i += 16) {
+        olda = a; oldb = b; oldc = c; oldd = d;
+        a = ff(a, b, c, d, x[i + 0], 7, -680876936); d = ff(d, a, b, c, x[i + 1], 12, -389564586); c = ff(c, d, a, b, x[i + 2], 17, 606105819);
+        b = ff(b, c, d, a, x[i + 3], 22, -1044525330); a = ff(a, b, c, d, x[i + 4], 7, -176418897); d = ff(d, a, b, c, x[i + 5], 12, 1200080426);
+        c = ff(c, d, a, b, x[i + 6], 17, -1473231341); b = ff(b, c, d, a, x[i + 7], 22, -45705983); a = ff(a, b, c, d, x[i + 8], 7, 1770035416);
+        d = ff(d, a, b, c, x[i + 9], 12, -1958414417); c = ff(c, d, a, b, x[i + 10], 17, -42063); b = ff(b, c, d, a, x[i + 11], 22, -1990404162);
+        a = ff(a, b, c, d, x[i + 12], 7, 1804603682); d = ff(d, a, b, c, x[i + 13], 12, -40341101); c = ff(c, d, a, b, x[i + 14], 17, -1502002290);
+        b = ff(b, c, d, a, x[i + 15], 22, 1236535329); a = gg(a, b, c, d, x[i + 1], 5, -165796510); d = gg(d, a, b, c, x[i + 6], 9, -1069501632);
+        c = gg(c, d, a, b, x[i + 11], 14, 643717713); b = gg(b, c, d, a, x[i + 0], 20, -373897302); a = gg(a, b, c, d, x[i + 5], 5, -701558691);
+        d = gg(d, a, b, c, x[i + 10], 9, 38016083); c = gg(c, d, a, b, x[i + 15], 14, -660478335); b = gg(b, c, d, a, x[i + 4], 20, -405537848);
+        a = gg(a, b, c, d, x[i + 9], 5, 568446438); d = gg(d, a, b, c, x[i + 14], 9, -1019803690); c = gg(c, d, a, b, x[i + 3], 14, -187363961);
+        b = gg(b, c, d, a, x[i + 8], 20, 1163531501); a = gg(a, b, c, d, x[i + 13], 5, -1444681467); d = gg(d, a, b, c, x[i + 2], 9, -51403784);
+        c = gg(c, d, a, b, x[i + 7], 14, 1735328473); b = gg(b, c, d, a, x[i + 12], 20, -1926607734); a = hh(a, b, c, d, x[i + 5], 4, -378558);
+        d = hh(d, a, b, c, x[i + 8], 11, -2022574463); c = hh(c, d, a, b, x[i + 11], 16, 1839030562); b = hh(b, c, d, a, x[i + 14], 23, -35309556);
+        a = hh(a, b, c, d, x[i + 1], 4, -1530992060); d = hh(d, a, b, c, x[i + 4], 11, 1272893353); c = hh(c, d, a, b, x[i + 7], 16, -155497632);
+        b = hh(b, c, d, a, x[i + 10], 23, -1094730640); a = hh(a, b, c, d, x[i + 13], 4, 681279174); d = hh(d, a, b, c, x[i + 0], 11, -358537222);
+        c = hh(c, d, a, b, x[i + 3], 16, -722521979); b = hh(b, c, d, a, x[i + 6], 23, 76029189); a = hh(a, b, c, d, x[i + 9], 4, -640364487);
+        d = hh(d, a, b, c, x[i + 12], 11, -421815835); c = hh(c, d, a, b, x[i + 15], 16, 530742520); b = hh(b, c, d, a, x[i + 2], 23, -995338651);
+        a = ii(a, b, c, d, x[i + 0], 6, -198630844); d = ii(d, a, b, c, x[i + 7], 10, 1126891415); c = ii(c, d, a, b, x[i + 14], 15, -1416354905);
+        b = ii(b, c, d, a, x[i + 5], 21, -57434055); a = ii(a, b, c, d, x[i + 12], 6, 1700485571); d = ii(d, a, b, c, x[i + 3], 10, -1894986606);
+        c = ii(c, d, a, b, x[i + 10], 15, -1051523); b = ii(b, c, d, a, x[i + 1], 21, -2054922799); a = ii(a, b, c, d, x[i + 8], 6, 1873313359);
+        d = ii(d, a, b, c, x[i + 15], 10, -30611744); c = ii(c, d, a, b, x[i + 6], 15, -1560198380); b = ii(b, c, d, a, x[i + 13], 21, 1309151649);
+        a = ii(a, b, c, d, x[i + 4], 6, -145523070); d = ii(d, a, b, c, x[i + 11], 10, -1120210379); c = ii(c, d, a, b, x[i + 2], 15, 718787259);
+        b = ii(b, c, d, a, x[i + 9], 21, -343485551); a = ad(a, olda); b = ad(b, oldb); c = ad(c, oldc); d = ad(d, oldd);
+    }
+    return rh(a) + rh(b) + rh(c) + rh(d);
+}
\ No newline at end of file
diff --git a/code/app/src/help/persistent-store.ts b/code/app/src/help/persistent-store.ts
index 6a54282..cb12547 100644
--- a/code/app/src/help/persistent-store.ts
+++ b/code/app/src/help/persistent-store.ts
@@ -1,6 +1,7 @@
 import {browser} from "$app/environment";
 import {writable as _writable, readable as _readable} from "svelte/store";
 import type {Writable, Readable, StartStopNotifier} from "svelte/store";
+import { log_debug, log_info } from "./logger";
 
 enum StoreType {
     SESSION = 0,
@@ -76,11 +77,11 @@ function subscribe<T>(store: Writable<T> | Readable<T>, options: WritableStore<T
 
 function writable_persistent<T>(options: WritableStore<T>): Writable<T> {
     if (!browser) {
-        console.warn("Persistent store is only available in the browser");
+        log_info("WARN: Persistent store is only available in the browser");
         return;
     }
     if (options.options === undefined) options.options = default_store_options;
-    console.log("Creating writable store with options: ", options);
+    log_debug("creating writable store with options: ", options);
     const store = _writable<T>(options.initialState);
     hydrate(store, options);
     subscribe(store, options);
@@ -89,11 +90,11 @@ function writable_persistent<T>(options: WritableStore<T>): Writable<T> {
 
 function readable_persistent<T>(options: ReadableStore<T>): Readable<T> {
     if (!browser) {
-        console.warn("Persistent store is only available in the browser");
+        log_info("WARN: Persistent store is only available in the browser");
         return;
     }
     if (options.options === undefined) options.options = default_store_options;
-    console.log("Creating readable store with options: ", options);
+    log_debug("Creating readable store with options: ", options);
     const store = _readable<T>(options.initialState, options.callback);
     // hydrate(store, options);
     subscribe(store, options);