X-Git-Url: http://source.bookstackapp.com/bookstack/blobdiff_plain/2e8d6ce7d9aad7569cd8bfbdd1126c869a78d379..refs/pull/5676/head:/resources/js/services/util.ts

diff --git a/resources/js/services/util.ts b/resources/js/services/util.ts
index 7f684dd42..61a02a3d2 100644
--- a/resources/js/services/util.ts
+++ b/resources/js/services/util.ts
@@ -99,3 +99,70 @@ export function wait(timeMs: number): Promise<any> {
         setTimeout(res, timeMs);
     });
 }
+
+/**
+ * Generate a full URL from the given relative URL, using a base
+ * URL defined in the head of the page.
+ */
+export function baseUrl(path: string): string {
+    let targetPath = path;
+    const baseUrlMeta = document.querySelector('meta[name="base-url"]');
+    if (!baseUrlMeta) {
+        throw new Error('Could not find expected base-url meta tag in document');
+    }
+
+    let basePath = baseUrlMeta.getAttribute('content') || '';
+    if (basePath[basePath.length - 1] === '/') {
+        basePath = basePath.slice(0, basePath.length - 1);
+    }
+
+    if (targetPath[0] === '/') {
+        targetPath = targetPath.slice(1);
+    }
+
+    return `${basePath}/${targetPath}`;
+}
+
+/**
+ * Get the current version of BookStack in use.
+ * Grabs this from the version query used on app assets.
+ */
+function getVersion(): string {
+    const styleLink = document.querySelector('link[href*="/dist/styles.css?version="]');
+    if (!styleLink) {
+        throw new Error('Could not find expected style link in document for version use');
+    }
+
+    const href = (styleLink.getAttribute('href') || '');
+    return href.split('?version=').pop() || '';
+}
+
+/**
+ * Perform a module import, Ensuring the import is fetched with the current
+ * app version as a cache-breaker.
+ */
+export function importVersioned(moduleName: string): Promise<object> {
+    const importPath = window.baseUrl(`dist/${moduleName}.js?version=${getVersion()}`);
+    return import(importPath);
+}
+
+/*
+    cyrb53 (c) 2018 bryc (github.com/bryc)
+    License: Public domain (or MIT if needed). Attribution appreciated.
+    A fast and simple 53-bit string hash function with decent collision resistance.
+    Largely inspired by MurmurHash2/3, but with a focus on speed/simplicity.
+    Taken from: https://github.com/bryc/code/blob/master/jshash/experimental/cyrb53.js
+*/
+export function cyrb53(str: string, seed: number = 0): string {
+    let h1 = 0xdeadbeef ^ seed, h2 = 0x41c6ce57 ^ seed;
+    for(let i = 0, ch; i < str.length; i++) {
+        ch = str.charCodeAt(i);
+        h1 = Math.imul(h1 ^ ch, 2654435761);
+        h2 = Math.imul(h2 ^ ch, 1597334677);
+    }
+    h1  = Math.imul(h1 ^ (h1 >>> 16), 2246822507);
+    h1 ^= Math.imul(h2 ^ (h2 >>> 13), 3266489909);
+    h2  = Math.imul(h2 ^ (h2 >>> 16), 2246822507);
+    h2 ^= Math.imul(h1 ^ (h1 >>> 13), 3266489909);
+    return String((4294967296 * (2097151 & h2) + (h1 >>> 0)));
+}
\ No newline at end of file