Implement using exfiltrated metadata

portal/static/js/components/pages/Fachschaftssitzung.mjs

@@ -2,7 +2,7 @@ import { Base } from "./Base.mjs"
 import { Agenda } from "../pieces/Agenda.mjs"
 import { getKey } from "../../account.mjs"
 import { ButtonAndTextLink } from "../pieces/ButtonAndTextLink.mjs"
-import { getLatestProtocolDate } from "../../gitlab.mjs"
+import { getLatestProtocolMetadata } from "../../gitlab.mjs"
 
 const items = {
     all: null,
@@ -29,7 +29,13 @@ const items = {
     },
 }
 
-let protocolDate = null
+const latestProtocol = {
+    meta: null,
+    async fetch() {
+        this.meta = await getLatestProtocolMetadata()
+        m.redraw()
+    },
+}
 
 export const Fachschaftssitzung = {
     oncreate() {
@@ -37,7 +43,7 @@ export const Fachschaftssitzung = {
     },
     async oninit() {
         items.fetch()
-        protocolDate = await getLatestProtocolDate()
+        latestProtocol.fetch()
     },
     view() {
         return m(Base, [
@@ -49,9 +55,7 @@ export const Fachschaftssitzung = {
                 m(
                     "p",
                     m(ButtonAndTextLink, {
-                        href:
-                            protocolDate &&
-                            `https://gitlab.cl.uni-heidelberg.de/-/ide/project/fachschaft/protokolle/edit/master/-/${protocolDate.slice(0, 4)}/${protocolDate}.md`,
+                        href: latestProtocol.meta?.editLink,
                         icon: "fa-solid fa-file-pen",
                         name: "Aktuelles Protokoll bearbeiten",
                     }),
@@ -59,23 +63,20 @@ export const Fachschaftssitzung = {
                 m(
                     "p",
                     m(ButtonAndTextLink, {
-                        href:
-                            protocolDate &&
-                            `https://gitlab.cl.uni-heidelberg.de/api/v4/projects/1193/jobs/artifacts/master/raw/pdfs/${protocolDate}.pdf?job=convert-to-pdf`,
+                        href: latestProtocol.meta?.downloadLink,
                         icon: "fa-regular fa-file-pdf",
                         name: "Protokoll als PDF herunterladen",
                     }),
                 ),
-                m(
-                    "p",
-                    m(ButtonAndTextLink, {
-                        href:
-                            protocolDate &&
-                            `https://gitlab.cl.uni-heidelberg.de/api/v4/projects/1193/jobs/artifacts/master/raw/pdfs/${protocolDate}_nur_Beschlüsse.pdf?job=convert-to-pdf`,
-                        icon: "fa-solid fa-gavel",
-                        name: "Beschlüsse als PDF herunterladen",
-                    }),
-                ),
+                latestProtocol.meta?.containsResolution &&
+                    m(
+                        "p",
+                        m(ButtonAndTextLink, {
+                            href: latestProtocol.meta?.resolutionDownloadLink,
+                            icon: "fa-solid fa-gavel",
+                            name: "Beschlüsse als PDF herunterladen",
+                        }),
+                    ),
             ]),
         ])
     },

portal/static/js/gitlab.mjs

@@ -39,39 +39,72 @@
  * the check will always fail.
  *
  * @param {String} imageUrl A url to an image file (likely hosted on some other origin)
+ * @returns The <img> object for further processing, or null if the browser cannot access it.
  */
-async function canAccess(imageUrl) {
+async function access(imageUrl) {
     try {
-        await new Promise((resolve, reject) => {
+        return await new Promise((resolve, reject) => {
             const img = document.createElement("img")
-            img.addEventListener("load", resolve)
+            img.addEventListener("load", resolve(img))
             img.addEventListener("error", reject)
             img.src = imageUrl
         })
-        return true
     } catch {
-        return false
+        return null
     }
 }
 
-export async function isLoggedIn() {}
+function toIsoString(year, month, day) {
+    return `${year.toString().padStart(4, "0")}-${month.toString().padStart(2, "0")}-${day.toString().padStart(2, "0")}`
+}
 
 /**
- * @returns if the browser session has access to the protocols repo on GitLab
+ * Return an object with metadata about the latest protocol, or null, if the metadata cannot be accessed
+ * (e.g., because the user is not logged in to GitLab, is logged in but has no access to the repo, or an error occurred in the pipeline).
+ *
+ * An example metadata object would be:
+ * {
+ *   year: 2024,
+ *   month: 6,
+ *   day: 19,
+ *   dateIso: "2024-06-19",
+ *   containsResolution: true,
+ *   editLink: "https://gitlab.cl.uni-heidelberg.de/-/ide/project/fachschaft/protokolle/edit/master/-/2024/2024-06-19.md",
+ *   downloadLink: "https://gitlab.cl.uni-heidelberg.de/api/v4/projects/1193/jobs/artifacts/master/raw/pdfs/2024-06-19.pdf?job=convert-to-pdf",
+ *   resolutionDownloadLink: "https://gitlab.cl.uni-heidelberg.de/api/v4/projects/1193/jobs/artifacts/master/raw/pdfs/2024-06-19_nur_Beschlüsse.pdf?job=convert-to-pdf"
+ * }
  */
-export async function canAccessProtocols() {
-    return await canAccess(
+export async function getLatestProtocolMetadata() {
+    const img = await access(
         "https://gitlab.cl.uni-heidelberg.de/api/v4/projects/1193/jobs/artifacts/master/raw/prtcl.svg?job=create-protocol-info-svg",
     )
-}
 
-/**
- * @returns the date of the latest protocol, e.g. "2024-06-19"
- */
-export async function getLatestProtocolDate() {
-    // TODO Actually fetch the information from GitLab somehow
-    const now = new Date()
-    const today = now.toISOString().split("T")[0]
+    if (!img) {
+        return null
+    }
+
+    const year = img.width
+    const month = Math.floor(img.height / 100)
+    const dayAndMaybeOffset = img.height - 100 * month
+    const containsResolution = dayAndMaybeOffset >= 43
+    const day = containsResolution ? dayAndMaybeOffset - 42 : dayAndMaybeOffset
+
+    const dateIso = toIsoString(year, month, day)
 
-    return today
+    const editLink = `https://gitlab.cl.uni-heidelberg.de/-/ide/project/fachschaft/protokolle/edit/master/-/${year}/${dateIso}.md`
+    const downloadLink = `https://gitlab.cl.uni-heidelberg.de/api/v4/projects/1193/jobs/artifacts/master/raw/pdfs/${dateIso}.pdf?job=convert-to-pdf`
+    const resolutionDownloadLink = containsResolution
+        ? `https://gitlab.cl.uni-heidelberg.de/api/v4/projects/1193/jobs/artifacts/master/raw/pdfs/${dateIso}_nur_Beschlüsse.pdf?job=convert-to-pdf`
+        : null
+
+    return {
+        dateIso,
+        year,
+        month,
+        day,
+        containsResolution,
+        editLink,
+        downloadLink,
+        resolutionDownloadLink,
+    }
 }