From b99bfabc235e4c7cb83bc3ba9ca303a7416ac2af Mon Sep 17 00:00:00 2001
From: Julien Oculi <xdrz.jot.sr@gmail.com>
Date: Tue, 4 Jun 2024 14:57:31 +0200
Subject: [PATCH] feat: add url utils

---
 src/url_utils.ts | 156 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 src/url_utils.ts

diff --git a/src/url_utils.ts b/src/url_utils.ts
new file mode 100644
index 0000000..8c63279
--- /dev/null
+++ b/src/url_utils.ts
@@ -0,0 +1,156 @@
+import { COHABIT_GIT_URL, PORTFOLIO_BASE_URL } from '../config.ts'
+import { User } from './user_utils.ts'
+
+/**
+ * Get raw files repository base url.
+ *
+ * @param user Login of the owner user.
+ * @returns Repository url for raw files.
+ *
+ * @example
+ * ```ts
+ * import { getRepoUrl } from './url_utils.ts'
+ *
+ * const repoUrl = getRepoUrl('john.doe')
+ * console.assert(repoUrl.href === 'https://git.cohabit.fr/john.doe/.portfolio/raw/branch/main/')
+ * ```
+ */
+export function getRepoUrl(user: User): URL {
+	const userRepoUrl = new URL(`./${user}/`, COHABIT_GIT_URL)
+	return new URL(PORTFOLIO_BASE_URL, userRepoUrl)
+}
+
+/**
+ * Get portfolio index URL depending of the presence of `/dist/index.html`.
+ *
+ * @param baseUrl Repository base url.
+ * @returns Index url, `./dist/index.html` is available else './README.md'.
+ *
+ * @example Basic WYSIWYG index
+ * ```ts
+ * import { getRepoUrl, getIndexUrl } from './url_utils.ts'
+ *
+ * const repoUrl = getRepoUrl('john.doe')
+ * const index = getIndexUrl(repoUrl)
+ *
+ * console.assert(index.href === new URL('./README.md', repoUrl).href)
+ * ```
+ *
+ * @example Generated index
+ * ```ts
+ * import { getRepoUrl, getIndexUrl } from './url_utils.ts'
+ *
+ * const repoUrl = getRepoUrl('john.doe')
+ * const baseUrl = new URL('./dist/', repoUrl)
+ * const index = getIndexUrl(baseUrl)
+ *
+ * console.assert(index.href === new URL('./dist/index.html', repoUrl).href)
+ * ```
+ */
+export function getIndexUrl(baseUrl: URL): URL {
+	if (baseUrl.pathname.endsWith('./dist/')) {
+		return new URL('./index.html', baseUrl)
+	}
+	return new URL('./README.md', baseUrl)
+}
+
+/**
+ * Get portfolio source URL from request URL.
+ *
+ * @param filePath request pathname of the file.
+ * @param baseUrl Repository base url.
+ * @returns URL of the source file.
+ *
+ * @example Basic WYSIWYG index
+ * ```ts
+ * import { getRepoUrl, getSourceUrl } from './url_utils.ts'
+ *
+ * const repoUrl = getRepoUrl('john.doe')
+ * const index = getSourceUrl('/', repoUrl)
+ * const file = getSourceUrl('/dir/path/file.any', repoUrl)
+ *
+ * console.assert(index.href === new URL('./README.md', repoUrl).href)
+ * console.assert(file.href === new URL('./dir/path/file.any', repoUrl).href)
+ * ```
+ *
+ * @example Generated index
+ * ```ts
+ * import { getRepoUrl, getSourceUrl } from './url_utils.ts'
+ *
+ * const repoUrl = getRepoUrl('john.doe')
+ * const baseUrl = new URL('./dist/', repoUrl)
+ * const index = getSourceUrl('/', baseUrl)
+ * const file = getSourceUrl('/dir/path/file.any', baseUrl)
+ *
+ * console.assert(index.href === new URL('./dist/index.html', repoUrl).href)
+ * console.assert(file.href === new URL('./dist/dir/path/file.any', repoUrl).href)
+ * ```
+ */
+export function getSourceUrl(filePath: string, baseUrl: URL): URL {
+	if (filePath === '/') {
+		return getIndexUrl(baseUrl)
+	}
+
+	return new URL(filePath, baseUrl)
+}
+
+/**
+ * Determine portfolio base URL from the repository structure.
+ * Check the presence of `./dist/index.html` to return either `./dist/` either `./` as base path.
+ *
+ * @param user User login of owner of the portfolio.
+ * @returns Portfolio base URL.
+ *
+ * @example Basic WYSIWYG index
+ *
+ * # Portfolio structure
+ *
+ * ```
+ * /
+ * ├──  README.md
+ * └── *
+ * ```
+ *
+ * # Resolved pathname
+ *
+ * ```ts
+ * import { getBaseUrl } from './url_utils.ts'
+ *
+ * const baseUrl = await getBaseUrl('john.doe')
+ *
+ * console.assert(baseUrl.pathname === '/')
+ * ```
+ *
+ * @example Generated index
+ *
+ * # Portfolio structure
+ *
+ * ```
+ * /
+ * ├──  dist
+ * │  ├──  index.html
+ * │  └── *
+ * └── *
+ * ```
+ *
+ * # Resolved pathname
+ *
+ * ```ts
+ * import { getBaseUrl } from './url_utils.ts'
+ *
+ * const baseUrl = await getBaseUrl('john.doe')
+ *
+ * console.assert(baseUrl.pathname === '/dist/')
+ * ```
+ */
+export async function getBaseUrl(user: User): Promise<URL> {
+	//TODO check network errors before last return
+	const repoUrl = getRepoUrl(user)
+	const response = await fetch(new URL('./dist/index.html', repoUrl))
+
+	if (response.ok) {
+		return new URL('./dist/', repoUrl)
+	}
+
+	return repoUrl
+}